走進springboot

阿輝ya發表於2021-04-03
Spring Boot

SpringBoot基礎

核心思想---自動裝配---約定大於配置

開發環境：jdk1.8、maven、springboot、idea

一、快速構建一個springboot專案

1.1、進入springboot官網

1.2、選擇配置並下載

1.3、專案的匯入

二、自動裝配原理

pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.4.2</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.example</groupId>
    <artifactId>springboot</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>springboot</name>
    <description>Demo project for Spring Boot</description>
    <properties>
        <java.version>1.8</java.version>
    </properties>
    <dependencies>
        <!-- 啟動器 -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
            <version>2.4.2</version>
        </dependency>
        <!-- jsr303校驗  後臺校驗資料的格式，配合@Validated  //資料校驗 ，使用！-->
        <dependency>
            <groupId>javax.validation</groupId>
            <artifactId>validation-api</artifactId>
            <version>2.0.1.Final</version>
        </dependency>
        <!-- 自動匯入web使用的所有依賴 -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <!-- springboot使用yml注入資料必備！ -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-configuration-processor</artifactId>
            <optional>true</optional>
        </dependency>
    </dependencies>

    <!-- 打包外掛 -->
    <build>
        <plugins>
<!--            <plugin>-->
<!--                <groupId>org.springframework.boot</groupId>-->
<!--                <artifactId>spring-boot-maven-plugin</artifactId>-->
<!--            </plugin>-->
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-surefire-plugin</artifactId>
                <version>2.22.1</version>
                <configuration>
                    <skipTests>true</skipTests>
                </configuration>
            </plugin>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <version>2.2.6.RELEASE</version>
                <executions>
                    <execution>
                        <goals>
                            <goal>repackage</goal>
                        </goals>
                    </execution>
                </executions>
            </plugin>
        </plugins>
    </build>

</project>

2.1、怎麼進行自動裝配？

spring boot的自動裝配：

1、spring boot啟動時會載入大量的自動配置類

2、在開發中看需要實現的功能是否存在springboot寫好的配置類，如果沒有就需要手動配置

3、在yml中修改springboot屬性值時（也就是配置），當它提示時，也就相當於你在修改springboot配置好的配置類中的屬性

4、springboot配置好的配置類可以在spring.factories中進行查詢出來，它會有一個xxxAutoConfiguration(自動配置類:給容器中新增元件)，它上面的xxxProperties配置的類屬性就是yml中可以進行修改的屬性，以此來達到想要配置的功能！！！

結論：主啟動器@SpringBootApplication通過掃描依賴中匯入的Spring-boot-autoconfigure下的jar包下的META-INF下的spring.factories中的配置進行裝配，但是不一定生效，如果沒有相應的啟動器，就不會生效，需要匯入相應的啟動器才能自動裝配，springboot的自動裝配的東西（以前需要自己寫的包或者配置檔案xml。。。）現在只需要在sprint-boot-autoconfigure-xxx.xx.RELEASE.jar包下都存在，不需要自己配置，只需要呼叫即可。。

三、yml寫法

  • yml對空格的要求嚴格

    #物件儲存
Dog:
  name: "lucky"
  age: "7"

Person:
  name: "阿輝"
  age : 22
  happy: true
  birth: 2021/2/23
  maps: {k1: v1, k2: v2}
  lists: [code,basketball,girl]
  dog:
    name: Lucky
    age: 22

    • 通過@Component和@ConfigurationProperties(prefix = "dog")將實體類的屬性與yml中的配置進行繫結

    • ConfigurationProperties(prefix = "dog")必須匯入spring-boot-configuration-processor依賴還需要使用prefix進行繫結！

package com.example.springboot.pojo;

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.stereotype.Component;

@Data
@NoArgsConstructor
@AllArgsConstructor
@Component
@ConfigurationProperties(prefix = "dog")
public class Dog {
    private String name;
    private Integer age;

    @Override
    public String toString() {
        return "Dog{" +
                "name='" + name + '\'' +
                ", age=" + age +
                '}';
    }
}

package com.example.springboot.pojo;

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.stereotype.Component;

import java.util.Date;
import java.util.List;
import java.util.Map;

@Data
@NoArgsConstructor
@AllArgsConstructor
@Component
@ConfigurationProperties(prefix = "person")
@Validated  //資料校驗
public class Person {
    private String name;
    private Integer age;
    private Boolean happy;
    private Date birth;
    private Map<String,Object> maps;
    private List<Object> lists;
    private Dog dog;

    @Override
    public String toString() {
        return "Person{" +
                "name='" + name + '\'' +
                ", age=" + age +
                ", happy=" + happy +
                ", birth=" + birth +
                ", maps=" + maps +
                ", lists=" + lists +
                ", dog=" + dog +
                '}';
    }
}

通過@Autowired的自動裝配原理將實體類中的資料進行輸出

package com.example.springboot;

import com.example.springboot.pojo.Dog;
import com.example.springboot.pojo.Person;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;

@SpringBootTest
class SpringbootApplicationTests {
    @Autowired
    private Dog dog;
    @Autowired
    private Person person;
    @Test
    void contextLoads() {
        System.out.println(dog);
        System.out.println("--------------");
        System.out.println(person);
    }

}

四、多環境切換測試

application.properties 環境切換(需要三個環境,application.properties、application-test.properties、application-dev.properties)

server.port=8080

# SpringBoot的多環境配置：自主選擇啟用配合檔案(test/dev)
spring.profiles.active=dev

application.yml方式實現多環境的切換

# 選擇啟用哪個環境(test/dev)  各個配置之間拿---分隔
spring:
  profiles:
    active: test
---
spring:
  profiles: test
server:
  port: 8082
---
spring:
  profiles: dev
server:
  port: 8089

五、靜態資源

​ 1、在springboot中，可以使用以下方式處理靜態資源：

  • webjars:localhost:8080/webjars/

  • public、static、/**、resources 可以使用:``localhost:8080/檔名.字尾名

    2、優先順序(如果檔案相同則)

    resources > static(預設)>public

六、擴充套件mvc

package com.example.springboot.config;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.View;
import org.springframework.web.servlet.ViewResolver;
import org.springframework.web.servlet.config.annotation.EnableWebMvc;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.ViewControllerRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;

import java.util.Locale;

//
//@EnableWebMvc就是新增了@Import({DelegatingWebMvcConfiguration.class})這個類，意思就是從容器中獲取所有的webmvcconfig
// 分析：WebMvcAutoConfig類有個@ConditionalOnMissingBean({WebMvcConfigurationSupport.class})
//      如果有這個類，那麼MyConfig就不會自動裝配，
//      又因為上面DelegatingWebMvcConfiguration這個類繼承了WebMvcConfigurationSupport
//      所以不能加@EnableWebMvc這個註解，不然就會失去自動裝配的功能！



// 擴充套件SpringMVC
@Configuration
public class MyConfig  implements WebMvcConfigurer {
    // ViewResolver 實現了檢視解析器介面的類  就相當於是個檢視解析器

    // 如果想要自定義的功能，只需要把它注入到bean中，交由Springboot，Springboot會幫我們自動裝配！
    @Bean // 自定義功能！！！
    public ViewResolver myViewResolver(){
        return new MyViewResolver();
    }

    public static class MyViewResolver implements ViewResolver{
        @Override
        public View resolveViewName(String s, Locale locale) throws Exception {
            return null;
        }
    }


    // 檢視跳轉
    @Override
    public void addViewControllers(ViewControllerRegistry registry) {
        // addViewController("/springboot")相當於用localhost:8080/springboot這個跳轉到localhost:8080/test
        // 相當於更名！！
        registry.addViewController("/springboot").setViewName("test");
    }
}

七、thymeleaf(模板引擎)的應用

7.1、 作用域的匯入

<html xmlns="http://www.w3.org/1999/xhtml" xmlns:th="http://www.thymeleaf.org">

7.2、thymeleaf的th的應用

(格式：th: href/ img / src="@{xxx}**")

<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml" xmlns:th="http://www.thymeleaf.org">
   <head>
      <meta charset="utf-8">
      <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
      <meta name="description" content="Gurdeep singh osahan">
      <meta name="author" content="Gurdeep singh osahan">
      <title>Miver</title>
      <!-- Favicon Icon -->
      <link rel="icon" type="image/png" th:href="@{images/fav.svg}">
      <!-- Bootstrap core CSS -->
      <link th:href="@{vendor/bootstrap/css/bootstrap.min.css}" rel="stylesheet">
      <!-- Font Awesome-->
      <link th:href="@{vendor/fontawesome/css/font-awesome.min.css}" rel="stylesheet">
      <!-- Material Design Icons -->
      <link th:href="@{vendor/icons/css/materialdesignicons.min.css}" media="all" rel="stylesheet" type="text/css">
      <!-- Slick -->
      <link th:href="@{vendor/slick-master/slick/slick.css}" rel="stylesheet" type="text/css">
      <!-- Lightgallery -->
      <link th:href="@{vendor/lightgallery-master/dist/css/lightgallery.min.css}" rel="stylesheet">
      <!-- Select2 CSS -->
      <link th:href="@{vendor/select2/css/select2-bootstrap.css}" />
      <link th:href="@{vendor/select2/css/select2.min.css}" rel="stylesheet">
      <!-- Custom styles for this template -->
      <link th:href="@{css/style.css}" rel="stylesheet">
   </head>
    
    <body>
        
     <div class="copyright">
     	<div class="logo">
          <a href="index.html">
            <img th:src="@{images/logo.svg}">
          </a>
      	</div>
       </div>
      <script th:src="@{vendor/jquery/jquery.min.js}"></script>
      <script th:src="@{vendor/bootstrap/js/bootstrap.bundle.min.js}"></script>
      <!-- Contact form JavaScript -->
      <!-- Do not edit these files! In order to set the email address and subject line for the contact form 		go to the bin/contact_me.php file. -->
      <script th:src="@{js/jqBootstrapValidation.js}"></script>
      <script th:src="@{js/contact_me.js"></script>
      <!-- Slick -->
      <script th:src="@{vendor/slick-master/slick/slick.js}" type="text/javascript" charset="utf-8">		</script>
      <!-- lightgallery -->
      <script th:src="@{vendor/lightgallery-master/dist/js/lightgallery-all.min.js}"></script>
      <!-- select2 Js -->
      <script th:src="@{vendor/select2/js/select2.min.js}"></script>
      <!-- Custom -->
      <script th:src="@{js/custom.js}"></script>
   </body>
  
</html>

八、整合Druid(阿里巴巴的資料庫連線池)

8.1、更改yml中資料庫連線type為Druid

spring:
  datasource:
    username: root
    password: root
    url: jdbc:mysql://localhost:3306/curry?usrUnicode=true&characterEncoding=utf-8
    driver-class-name: com.mysql.cj.jdbc.Driver
    type: com.alibaba.druid.pool.DruidDataSource
  thymeleaf:
    cache: false #關閉快取
    mode: HTML5 #設定模板型別
    encoding: utf-8  #設定編碼

# 列印自動生成的sql語句
mybatis-plus:
  configuration:
    log-impl: org.apache.ibatis.logging.stdout.StdOutImpl

8.2、實現Druid繫結到yml中

並實現一個後臺監控功能

package com.example.springboot_data.config;

import com.alibaba.druid.pool.DruidDataSource;
import com.alibaba.druid.support.http.StatViewServlet;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.boot.web.servlet.ServletRegistrationBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

import javax.sql.DataSource;
import java.util.HashMap;

@Configuration
public class DruidConfig {

    //繫結到yml中
    @ConfigurationProperties(prefix = "spring.datasource")
    @Bean
    public DataSource druidDataSource(){
        return new DruidDataSource();
    }

    @Bean
    //後臺監控功能 :spring可以在增加web功能下的web.xml中配置 但是springboot就通過ServletRegistrationBean配置
    public ServletRegistrationBean statViewServlet(){
        ServletRegistrationBean<StatViewServlet> bean = new ServletRegistrationBean<>(new StatViewServlet(),"/druid/*");

        //後臺登入  賬戶密碼配置
        HashMap<String,String> initParameters = new HashMap<>();

        //賬戶密碼設定
        initParameters.put("loginUsername","admin");
        initParameters.put("loginPassword","admin");

        // 禁止誰訪問！
        initParameters.put("ahui","192.168.11.12");

        bean.setInitParameters(initParameters);
        System.out.println(bean.getInitParameters()+"this is getInit");
        return bean;
    }

}

8.3、實現filter過濾器

import org.springframework.context.annotation.Configuration;
import javax.servlet.Filter;
import javax.sql.DataSource;
import java.util.HashMap;

@Configuration
public class DruidConfig {

@Bean
    public FilterRegistrationBean webStatFilter(){

        FilterRegistrationBean<Filter> bean = new FilterRegistrationBean<>();
        bean.setFilter(new WebStatFilter());

        // 過濾請求
        HashMap<String, String> initParameters = new HashMap<>();

        //過濾這些東西
        initParameters.put("exclusions","*.js,*.css,/druid/*");
        bean.setInitParameters(initParameters);
        return bean;
    }
}

九、springboot整合mybatis

9.1、UserController實現跳轉

package com.example.springboot_mybatis.controller;

import com.example.springboot_mybatis.mapper.UserMapper;
import com.example.springboot_mybatis.pojo.User;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RestController;

import java.util.List;

@RestController
public class UserController {

    @Autowired(required = false)
    private UserMapper userMapper;

    @GetMapping("/queryUserList")
    public List<User>  queryUserList(){
        List<User> users = userMapper.queryUserList();
        users.forEach(System.out::println);
        return users;
    }

    // 使用restful風格取值id 並查詢
    @GetMapping("/queryById/{id}")
    public User queryById( @PathVariable Integer id){
        return userMapper.queryById(id);
    }
}

9.2、UserMapper介面實現查詢功能

package com.example.springboot_mybatis.mapper;


import com.example.springboot_mybatis.pojo.User;
import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Param;
import org.apache.ibatis.annotations.Select;
import org.springframework.stereotype.Repository;

import java.util.List;

@Mapper // @Mapper表示這是一個mybatis的mapper類
// 也可以在主程式入口使用@MapperScan("com.example.springboot_mybatis.mapper"))

@Repository
//@Component
public interface UserMapper {

    @Select("select * from user")
    List<User> queryUserList();

    @Select("select * from user where id = #{id}")
    User queryById(@Param("id") int id);


    int addUser(@Param("User")User user);

    int updateUser(@Param("User")User user);

    int deleteUserById(@Param("id")int id);
}

9.3、User實體類

package com.example.springboot_mybatis.pojo;

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
@Data
@NoArgsConstructor
@AllArgsConstructor
public class User {
    private Integer id;
    private String name;
    private Integer age;
    private String email;
    private Integer version;
    private String gmt_create;
    private String gmt_modified;
}

9.4、yml配置連線資料庫及繫結mybatis

spring:
  datasource:
    type: org.springframework.jdbc.datasource.DriverManagerDataSource
    username: root
    password: root
    url: jdbc:mysql://localhost:3306/curry?serverTimezone=UTC&useUnicode=true&characterEncoding=utf-8
    driver-class-name: com.mysql.cj.jdbc.Driver
#整合mybatis
mybatis:
  type-aliases-package: com.example.springboot_mybaits.pojo
#  mapper-locations: classpath:mybatis/mapper/*.xml 用註解就直接省去xml配置

十、SpringSecurity安全機制

安全框架：shiro、springsecurity

安全框架的作用：認證、授權

  • 功能許可權
  • 訪問許可權
  • 選單許可權

重要security類：

  • webSecurityConfiguration : 自定義 security 策略
  • AuthenticationManagerBuilder ： 自定義認真策略
  • @EnableWebSecurity ： 開啟 WebSecurity 模式

配置類：SecurityConfig.java

package com.example.spring_security.config;

import com.example.spring_security.controller.RouterController;
import org.springframework.security.config.annotation.authentication.builders.AuthenticationManagerBuilder;
import org.springframework.security.config.annotation.web.builders.HttpSecurity;
import org.springframework.security.config.annotation.web.builders.WebSecurity;
import org.springframework.security.config.annotation.web.configuration.EnableWebSecurity;
import org.springframework.security.config.annotation.web.configuration.WebSecurityConfigurerAdapter;
import org.springframework.security.crypto.bcrypt.BCryptPasswordEncoder;


// Aop式程式設計
@EnableWebSecurity
public class SecurityConfig  extends WebSecurityConfigurerAdapter {
    @Override
    protected void configure(HttpSecurity http) throws Exception {


        // 首頁所有人可以訪問，功能頁只有對應有許可權的人可以訪問
        //它是鏈式程式設計

        // 授權
        http.authorizeRequests().antMatchers("/").permitAll()
        .antMatchers("/level1/**").hasRole("vip1")
        .antMatchers("/level2/**").hasRole("vip2")
        .antMatchers("/level3/**").hasRole("vip3"); //認證請求

        // 沒有許可權，進入就需要登入
        http.formLogin();


        //開啟登出功能 並跳轉到首頁
        http.logout().logoutSuccessUrl("/");

        // springSecurity為了防止網站攻擊 預設開啟了csrf功能
//        http.csrf().disable();
    }


    // 認證 springboot 2.1.x 可以直接使用
    // 密碼編碼： PasswordEncoder 沒有編碼的錯誤~！
    // 如果沒有密碼編碼伺服器會報500錯誤 ：.withUser("guest").password("guest").roles("vip1");
    // 對他進行加密之後：new BCryptPasswordEncoder().encode("curry")
    @Override
    protected void configure(AuthenticationManagerBuilder auth) throws Exception {
        auth.inMemoryAuthentication().passwordEncoder(new BCryptPasswordEncoder())
                .withUser("ahui").password(new BCryptPasswordEncoder().encode("curry")).roles("vip2","vip3")
                .and()
                .withUser("admin").password(new BCryptPasswordEncoder().encode("admin")).roles("vip2","vip3","vip1")
                .and()
                .withUser("guest").password(new BCryptPasswordEncoder().encode("guest")).roles("vip1");
    }
}

controller類：RouterController.java

package com.example.spring_security.controller;


import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.*;
import org.thymeleaf.util.StringUtils;

import javax.servlet.http.HttpSession;

@Controller
public class RouterController {

    @RequestMapping("/index")
    public String toIndex(){
        return "index";
    }

    @RequestMapping("/login")
    public String toLogin(){
        return "/views/login";
    }

    @PostMapping("/user/login")
    public String redirectLogin(Model model, HttpSession httpSession, @RequestParam("username") String userName, @RequestParam("password") String passWord){
        if (!StringUtils.isEmpty(userName) && "admin".equals(passWord))
        {
//            httpSession.setAttribute("loginUser",userName);
            return "redirect:/index.html";
        }
        else
        {
            model.addAttribute("msg","使用者名稱或密碼錯誤");
            return "views/login";
        }

    }

    @RequestMapping("/level1/{id}")
    public String toLevel1(@PathVariable("id") int id){
        return "views/level1/"+id;
    }

    @RequestMapping("/level2/{id}")
    public String toLevel2(@PathVariable("id") int id){
        return "views/level2/"+id;
    }

    @RequestMapping("/level3/{id}")
    public String toLevel3(@PathVariable("id") int id){
        return "views/level3/"+id;
    }

}

十一、shiro安全機制

shiro需要一個config類來實現過濾 和一個realm物件來實現認證與授權

application.yml

#連線資料庫的配置，以及使用druid資料來源進行連線
spring:
  thymeleaf:
    cache: false
  datasource:
    url: jdbc:mysql://localhost:3306/curry?serverTimezone=UTC&useUnicode=true&characterEncoding=utf-8
    driver-class-name: com.mysql.cj.jdbc.Driver
    username: root
    password: root
    type: com.alibaba.druid.pool.DruidDataSource

mybatis:
#  mapper-locations: classpath:mapper/*.xml //使用mybatis註解實現，不需要使用xml方式
  type-aliases-package: com.example.shiro_springboot.pojo

shiroconfig.java

package com.example.shiro_springboot.config;
import org.apache.shiro.spring.web.ShiroFilterFactoryBean;
import org.apache.shiro.web.mgt.DefaultWebSecurityManager;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

import java.util.LinkedHashMap;
import java.util.Map;

@Configuration
public class ShiroConfig {
    // shiroFilterFactoryBean 過濾器
    @Bean // 通過@Qualifier("defaultWebSecurityManager")與下面的@Bean(name = "defaultWebSecurityManager")的方法繫結
    public ShiroFilterFactoryBean getShiroFilterFactoryBean(@Qualifier("defaultWebSecurityManager") DefaultWebSecurityManager defaultWebSecurityManager){
        ShiroFilterFactoryBean bean = new ShiroFilterFactoryBean();

        // 設定安全管理器
        bean.setSecurityManager(defaultWebSecurityManager);

        //新增shiro的內建過濾器！
        /*
        * anon : 無需認證就可以訪問
        * authc : 必須認證了才能訪問
        * user : 必須擁有記住我功能才能訪問
        * perms : 擁有對某個資源的許可權才能訪問
        * role : 擁有某個角色許可權才能訪問
        *  */
        Map<String, String> filterChainDefinitionMap = new LinkedHashMap<>();
        bean.setFilterChainDefinitionMap(filterChainDefinitionMap);
//        filterChainDefinitionMap.put("/user/add","authc");
//        filterChainDefinitionMap.put("/user/update","authc");

        //許可權設定 沒有add許可權
        filterChainDefinitionMap.put("/user/update","perms[user:update]");
        filterChainDefinitionMap.put("/user/add","perms[user:add]");
        filterChainDefinitionMap.put("/user/*","authc");

        // 授權跳轉
        bean.setUnauthorizedUrl("/noauth");

        bean.setLoginUrl("/toLogin");

        // 設定攔截器
        bean.setFilterChainDefinitionMap(filterChainDefinitionMap);
        return bean;
    }

    // DefaultWebSecurityManager
    @Bean(name = "defaultWebSecurityManager")
    public DefaultWebSecurityManager getDefaultWebSecurityManager(@Qualifier("userRealm") UserRealm userRealm){
        // 通過@Qualifier("userRealm")與下面的UserRealm的方法繫結
        DefaultWebSecurityManager securityManager = new DefaultWebSecurityManager();
        // 關聯UserRealm
        securityManager.setRealm(userRealm);
        return securityManager;
    }


    //建立realm 物件
    @Bean
    public UserRealm userRealm(){
        return new UserRealm();
    }
}

Userrealm.java

package com.example.shiro_springboot.config;

import com.example.shiro_springboot.pojo.User;
import com.example.shiro_springboot.service.UserService;
import org.apache.shiro.SecurityUtils;
import org.apache.shiro.authc.*;
import org.apache.shiro.authz.AuthorizationInfo;
import org.apache.shiro.authz.SimpleAuthorizationInfo;
import org.apache.shiro.realm.AuthorizingRealm;
import org.apache.shiro.subject.PrincipalCollection;
import org.apache.shiro.subject.Subject;
import org.springframework.beans.factory.annotation.Autowired;

public class UserRealm extends AuthorizingRealm {


    @Autowired
    UserService userService;

    // 授權
    @Override
    protected AuthorizationInfo doGetAuthorizationInfo(PrincipalCollection principalCollection) {
        System.out.println("執行了授權方法");

        SimpleAuthorizationInfo info = new SimpleAuthorizationInfo();
        info.addStringPermission("user:add");

        //拿到當前登入的使用者 的物件

        Subject subject = SecurityUtils.getSubject();
        User currentUser = (User) subject.getPrincipal(); //拿到User物件

        //
        info.addStringPermission(currentUser.getPerms());
        return info;
    }

    // 認證
    @Override
    protected AuthenticationInfo doGetAuthenticationInfo(AuthenticationToken authenticationToken) throws AuthenticationException {
        System.out.println("執行了"+authenticationToken+"方法!!!");
        //獲取當前的使用者
        Subject subject = SecurityUtils.getSubject();
        //偽造的資料庫資訊
//        String name = "admin";
//        String password = "admin";

        UsernamePasswordToken userToken = (UsernamePasswordToken) authenticationToken;
        //連線真實資料庫
        User user = userService.queryUserByName(userToken.getUsername());
        if(user == null) // 如果等於null  表示沒有這個人
            return null;


        //Shiro 做密碼加密方式，Md5   md5鹽支加密
        // shiro做的密碼認證  直接交給shiro
        return new SimpleAuthenticationInfo("",user.getPwd(),"");
    }
}

跳轉檢視

ShiroController.java

package com.example.shiro_springboot.controller;


import com.example.shiro_springboot.mapper.UserMapper;
import org.apache.shiro.SecurityUtils;
import org.apache.shiro.authc.IncorrectCredentialsException;
import org.apache.shiro.authc.UnknownAccountException;
import org.apache.shiro.authc.UsernamePasswordToken;
import org.apache.shiro.subject.Subject;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;

@Controller
public class ShiroController {

    @Autowired(required = false)
    private UserMapper userMapper;

    @GetMapping({"/","/index"})
    public String sayShiro(Model model){
        model.addAttribute("msg","hello shiro!!!");
        return "index";
    }

//    @GetMapping("/userList")
//    public String userList(Model model){
//        List<User> users = userMapper.queryUserByName();
//        model.addAttribute("msg",users);
//
//        users.forEach(System.out::println);
//        return "user/showUsers";
//    }
    @GetMapping("/user/add")
    public String add(){

        return "user/add";
    }

    @GetMapping("/user/update")
    public String update(){

        return "user/update";
    }

    @GetMapping("/toLogin")
    public String toLogin(){
        return "user/login";
    }

    @RequestMapping("/noauth")
    @ResponseBody
    public String noAuth(){
        return "未經授權無法登陸！";
    }

    @RequestMapping("/login")
    public String login(String username, String password, Model model){
        // 獲取當前使用者
        Subject subject = SecurityUtils.getSubject();

        // 封裝使用者的登入資料
        UsernamePasswordToken token = new UsernamePasswordToken(username, password);

        try {
            subject.login(token); // 執行登入的方法，如果沒有異常，就登入成功！
            return "index";
        }catch (UnknownAccountException e){
            model.addAttribute("msg","使用者名稱錯誤！");
            return "user/login";
        }
        catch (IncorrectCredentialsException e){
            model.addAttribute("msg","密碼錯誤!");
            return "user/login";
        }

    }

}

UserMapper.java 查詢資料庫

package com.example.shiro_springboot.mapper;

import com.example.shiro_springboot.pojo.User;
import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Select;
import org.springframework.stereotype.Repository;

@Repository
@Mapper
//@Component
public interface UserMapper {


    @Select("select * from user where name = #{name}")
    public User queryUserByName(String name);
}

實體類pojo/User.java

package com.example.shiro_springboot.pojo;

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;

import java.util.Date;

@Data
@NoArgsConstructor
@AllArgsConstructor
public class User {
    private Integer id;
    private String perms;
    private String name;
    private String pwd;
    private Integer age;
    private String email;
    private Integer version;
    private Date gmt_create;
    private Date gmt_modified;

}

十二、Swagger

  • 前後端分離——技術棧 (Vue + Springboot)

    • Swagger版本3.0.x 就不支援 訪問localhost:8080/swagger-ui.html介面訪問到
    • 而Swagger的2.9.x則支援

  • swagger依賴

    <!--        swagger依賴-->
        <!-- https://mvnrepository.com/artifact/io.springfox/springfox-swagger2 -->
        <dependency>
            <groupId>io.springfox</groupId>
            <artifactId>springfox-swagger2</artifactId>
            <version>2.9.1</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/io.springfox/springfox-swagger-ui -->
        <dependency>
            <groupId>io.springfox</groupId>
            <artifactId>springfox-swagger-ui</artifactId>
            <version>2.9.1</version>
        </dependency>

  • SwaggerConfig配置

    package com.example.springboot_swagger.config;


import io.swagger.annotations.Api;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import springfox.documentation.builders.PathSelectors;
import springfox.documentation.builders.RequestHandlerSelectors;
import springfox.documentation.service.ApiInfo;
import springfox.documentation.service.Contact;
import springfox.documentation.spi.DocumentationType;
import springfox.documentation.spring.web.plugins.Docket;
import springfox.documentation.swagger2.annotations.EnableSwagger2;

import java.util.ArrayList;

@Configuration
@EnableSwagger2  //開啟Swagger
public class SwaggerConfig {

    //配置了Swagger的Bean例項
    @Bean
    public Docket docket(){
        return new Docket(DocumentationType.SWAGGER_2)
                .apiInfo(apiInfo())
            	// .enable(true)   true表示啟動swagger  false表示不啟動swagger
                .select()
                // basePackage 表示指定掃描哪個包
                .paths(PathSelectors.ant("/example")) // 過濾路徑！
                .build(); // build工廠模式
    }

    // 配置Swagger資訊  ApiInfo類
    private ApiInfo apiInfo(){
        return new ApiInfo("阿輝的Swagger",
                "Api Documentation",
                "v1.0",
                "urn:tos",
                new Contact("阿輝", "https://www.baidu.com", "1917523457@qq.com"),
                "Apache 2.0",
                "http://www.apache.org/licenses/LICENSE-2.0",
                new ArrayList());
    }
}

  • swagger 實現頂部分組功能！

    • 不同分組實現不同環境的介面
        @Bean
    public Docket docket(){


        // 顯示swagger環境
        Profiles profiles = Profiles.of("dev","test");

        System.out.println(profiles+"dasdas");

        return new Docket(DocumentationType.SWAGGER_2)
                .apiInfo(apiInfo())
                // 如何做到多個分組  多個docket例項就可以做到多個分組 及多個docket方法！方法名不同即可
                .groupName("阿輝")
                .select()
                // basePackage 表示指定掃描哪個包
                .paths(PathSelectors.ant("/example")) // 過濾路徑！
                .build(); // build工廠模式
    }

    @Bean
    public Docket docket2(){

        return new Docket(DocumentationType.SWAGGER_2).groupName("Stephen");
    }
    @Bean
    public Docket docket3(){

        return new Docket(DocumentationType.SWAGGER_2).groupName("curry");
    }

十三、非同步任務實現

service層實現多執行緒模擬

package com.example.demo.service;

import org.springframework.scheduling.annotation.Async;
import org.springframework.stereotype.Service;

@Service
public class TaskService {

    @Async // 表示為非同步鎖！
    public void ok() throws InterruptedException {
        Thread.sleep(3000);
        System.out.println("資料正在處理中……");
    }
}

controller層實現

  • Controller呼叫service層
package com.example.demo.controller;

import com.example.demo.service.TaskService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;

@Controller
public class TaskController {


    @Autowired
    TaskService taskService;

    @RequestMapping("/hello")
    @ResponseBody
    public String sayHello() throws InterruptedException {
        taskService.ok();

        return "OK";
    }
}

  • 實現非同步任務排程 還需要在主類上開啟非同步

    @EnableAsync

  • 定時任務的執行

    corn表示式的執行

  • 需要在主類上加入定時任務執行的註解

    @EnableScheduling //開啟定時任務

  • 需要在被執行的方法的上面加上

    @Scheduled(cron = "0/5 * * * * ?")

package com.example.demo.service;

import org.springframework.scheduling.annotation.Async;
import org.springframework.scheduling.annotation.Scheduled;
import org.springframework.stereotype.Service;

@Service
public class TaskService {

    //corn表示式   corn表示式依次順序    秒 分 時 日 月  星期(可以設定0-7或者? 表示每天)

    // corn = "30 0/5 10,18 * ？" 表示每天的十點和十八點  每隔五分鐘執行一次

    //corn = "0 0 12 ? * 1-6" 每個月的週一到週六12點00分執行一次
    @Scheduled(cron = "0/5 * * * * ?")  //每天每時每刻五秒執行一次
    public void hello(){
        System.out.println("hello 被執行！");
    }
}

十四、序列化的實現

springboot整合redis ，redis儲存物件需要使用到序列化方式去傳遞！

package com.example.config;

import com.fasterxml.jackson.annotation.JsonAutoDetect;
import com.fasterxml.jackson.annotation.PropertyAccessor;
import com.fasterxml.jackson.databind.ObjectMapper;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.redis.connection.RedisConnectionFactory;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.serializer.Jackson2JsonRedisSerializer;
import org.springframework.data.redis.serializer.StringRedisSerializer;

@Configuration
public class RedisConfig {

    @Bean
    @SuppressWarnings("all") // 消除所有的警告問題
    public RedisTemplate<String, Object> redisTemplate(RedisConnectionFactory redisConnectionFactory) {

        // 公司序列化的模板！！！！
        
        // 為了開發方便，一般使用<String, Object>
        RedisTemplate<String, Object> template = new RedisTemplate<>();
        template.setConnectionFactory(redisConnectionFactory);

        //Json序列化配置
        Jackson2JsonRedisSerializer jackson2JsonRedisSerializer = new Jackson2JsonRedisSerializer(Object.class);
        ObjectMapper om = new ObjectMapper();
        om.setVisibility(PropertyAccessor.ALL, JsonAutoDetect.Visibility.ANY);
        om.enableDefaultTyping(ObjectMapper.DefaultTyping.NON_FINAL);
        jackson2JsonRedisSerializer.setObjectMapper(om);

        //String的序列化
        StringRedisSerializer stringRedisSerializer = new StringRedisSerializer();
        
        //Key採用String的序列化方式
        template.setKeySerializer(stringRedisSerializer);
        //hash的key也採用String的序列化方式
        template.setHashKeySerializer(stringRedisSerializer);
        //value序列化方式採用jackson
        template.setValueSerializer(jackson2JsonRedisSerializer);
        
        //hash的value序列化方式採用Jackson
        template.setHashKeySerializer(jackson2JsonRedisSerializer);
        template.afterPropertiesSet();

        return template;
    }

}

把redis常用操作集中一起 定義成一個元件

  • RedisUtil
package com.example.utils;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.stereotype.Component;
import org.springframework.util.CollectionUtils;

import java.util.Collection;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.TimeUnit;

@Component
public class RedisUtil {
    @Autowired //自動裝配我們上面所配置的序列化方式
    private RedisTemplate<String, Object> redisTemplate;

    // =============================common============================
    /**
     * 指定快取失效時間
     * @param key  鍵
     * @param time 時間(秒)
     */
    public boolean expire(String key, long time) {
        try {
            if (time > 0) {
                redisTemplate.expire(key, time, TimeUnit.SECONDS);
            }
            return true;
        } catch (Exception e) {
            e.printStackTrace();
            return false;
        }
    }

    /**
     * 根據key 獲取過期時間
     * @param key 鍵 不能為null
     * @return 時間(秒) 返回0代表為永久有效
     */
    public long getExpire(String key) {
        return redisTemplate.getExpire(key, TimeUnit.SECONDS);
    }


    /**
     * 判斷key是否存在
     * @param key 鍵
     * @return true 存在 false不存在
     */
    public boolean hasKey(String key) {
        try {
            return redisTemplate.hasKey(key);
        } catch (Exception e) {
            e.printStackTrace();
            return false;
        }
    }


    /**
     * 刪除快取
     * @param key 可以傳一個值 或多個
     */
    @SuppressWarnings("unchecked")
    public void del(String... key) {
        if (key != null && key.length > 0) {
            if (key.length == 1) {
                redisTemplate.delete(key[0]);
            } else {
                redisTemplate.delete((Collection<String>) CollectionUtils.arrayToList(key));
            }
        }
    }


    // ============================String=============================

    /**
     * 普通快取獲取
     * @param key 鍵
     * @return 值
     */
    public Object get(String key) {
        return key == null ? null : redisTemplate.opsForValue().get(key);
    }

    /**
     * 普通快取放入
     * @param key   鍵
     * @param value 值
     * @return true成功 false失敗
     */

    public boolean set(String key, Object value) {
        try {
            redisTemplate.opsForValue().set(key, value);
            return true;
        } catch (Exception e) {
            e.printStackTrace();
            return false;
        }
    }


    /**
     * 普通快取放入並設定時間
     * @param key   鍵
     * @param value 值
     * @param time  時間(秒) time要大於0 如果time小於等於0 將設定無限期
     * @return true成功 false 失敗
     */

    public boolean set(String key, Object value, long time) {
        try {
            if (time > 0) {
                redisTemplate.opsForValue().set(key, value, time, TimeUnit.SECONDS);
            } else {
                set(key, value);
            }
            return true;
        } catch (Exception e) {
            e.printStackTrace();
            return false;
        }
    }


    /**
     * 遞增
     * @param key   鍵
     * @param delta 要增加幾(大於0)
     */
    public long incr(String key, long delta) {
        if (delta < 0) {
            throw new RuntimeException("遞增因子必須大於0");
        }
        return redisTemplate.opsForValue().increment(key, delta);
    }


    /**
     * 遞減
     * @param key   鍵
     * @param delta 要減少幾(小於0)
     */
    public long decr(String key, long delta) {
        if (delta < 0) {
            throw new RuntimeException("遞減因子必須大於0");
        }
        return redisTemplate.opsForValue().increment(key, -delta);
    }


    // ================================Map=================================

    /**
     * HashGet
     * @param key  鍵 不能為null
     * @param item 項 不能為null
     */
    public Object hget(String key, String item) {
        return redisTemplate.opsForHash().get(key, item);
    }

    /**
     * 獲取hashKey對應的所有鍵值
     * @param key 鍵
     * @return 對應的多個鍵值
     */
    public Map<Object, Object> hmget(String key) {
        return redisTemplate.opsForHash().entries(key);
    }

    /**
     * HashSet
     * @param key 鍵
     * @param map 對應多個鍵值
     */
    public boolean hmset(String key, Map<String, Object> map) {
        try {
            redisTemplate.opsForHash().putAll(key, map);
            return true;
        } catch (Exception e) {
            e.printStackTrace();
            return false;
        }
    }


    /**
     * HashSet 並設定時間
     * @param key  鍵
     * @param map  對應多個鍵值
     * @param time 時間(秒)
     * @return true成功 false失敗
     */
    public boolean hmset(String key, Map<String, Object> map, long time) {
        try {
            redisTemplate.opsForHash().putAll(key, map);
            if (time > 0) {
                expire(key, time);
            }
            return true;
        } catch (Exception e) {
            e.printStackTrace();
            return false;
        }
    }


    /**
     * 向一張hash表中放入資料,如果不存在將建立
     *
     * @param key   鍵
     * @param item  項
     * @param value 值
     * @return true 成功 false失敗
     */
    public boolean hset(String key, String item, Object value) {
        try {
            redisTemplate.opsForHash().put(key, item, value);
            return true;
        } catch (Exception e) {
            e.printStackTrace();
            return false;
        }
    }

    /**
     * 向一張hash表中放入資料,如果不存在將建立
     *
     * @param key   鍵
     * @param item  項
     * @param value 值
     * @param time  時間(秒) 注意:如果已存在的hash表有時間,這裡將會替換原有的時間
     * @return true 成功 false失敗
     */
    public boolean hset(String key, String item, Object value, long time) {
        try {
            redisTemplate.opsForHash().put(key, item, value);
            if (time > 0) {
                expire(key, time);
            }
            return true;
        } catch (Exception e) {
            e.printStackTrace();
            return false;
        }
    }


    /**
     * 刪除hash表中的值
     *
     * @param key  鍵 不能為null
     * @param item 項 可以使多個 不能為null
     */
    public void hdel(String key, Object... item) {
        redisTemplate.opsForHash().delete(key, item);
    }


    /**
     * 判斷hash表中是否有該項的值
     *
     * @param key  鍵 不能為null
     * @param item 項 不能為null
     * @return true 存在 false不存在
     */
    public boolean hHasKey(String key, String item) {
        return redisTemplate.opsForHash().hasKey(key, item);
    }


    /**
     * hash遞增 如果不存在,就會建立一個 並把新增後的值返回
     *
     * @param key  鍵
     * @param item 項
     * @param by   要增加幾(大於0)
     */
    public double hincr(String key, String item, double by) {
        return redisTemplate.opsForHash().increment(key, item, by);
    }


    /**
     * hash遞減
     *
     * @param key  鍵
     * @param item 項
     * @param by   要減少記(小於0)
     */
    public double hdecr(String key, String item, double by) {
        return redisTemplate.opsForHash().increment(key, item, -by);
    }


    // ============================set=============================

    /**
     * 根據key獲取Set中的所有值
     * @param key 鍵
     * @return
     */
    public Set<Object> sGet(String key) {
        try {
            return redisTemplate.opsForSet().members(key);
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
    }


    /**
     * 根據value從一個set中查詢,是否存在
     *
     * @param key   鍵
     * @param value 值
     * @return true 存在 false不存在
     */
    public boolean sHasKey(String key, Object value) {
        try {
            return redisTemplate.opsForSet().isMember(key, value);
        } catch (Exception e) {
            e.printStackTrace();
            return false;
        }
    }


    /**
     * 將資料放入set快取
     *
     * @param key    鍵
     * @param values 值 可以是多個
     * @return 成功個數
     */
    public long sSet(String key, Object... values) {
        try {
            return redisTemplate.opsForSet().add(key, values);
        } catch (Exception e) {
            e.printStackTrace();
            return 0;
        }
    }


    /**
     * 將set資料放入快取
     *
     * @param key    鍵
     * @param time   時間(秒)
     * @param values 值 可以是多個
     * @return 成功個數
     */
    public long sSetAndTime(String key, long time, Object... values) {
        try {
            Long count = redisTemplate.opsForSet().add(key, values);
            if (time > 0)
                expire(key, time);
            return count;
        } catch (Exception e) {
            e.printStackTrace();
            return 0;
        }
    }


    /**
     * 獲取set快取的長度
     *
     * @param key 鍵
     */
    public long sGetSetSize(String key) {
        try {
            return redisTemplate.opsForSet().size(key);
        } catch (Exception e) {
            e.printStackTrace();
            return 0;
        }
    }


    /**
     * 移除值為value的
     *
     * @param key    鍵
     * @param values 值 可以是多個
     * @return 移除的個數
     */

    public long setRemove(String key, Object... values) {
        try {
            Long count = redisTemplate.opsForSet().remove(key, values);
            return count;
        } catch (Exception e) {
            e.printStackTrace();
            return 0;
        }
    }

    // ===============================list=================================

    /**
     * 獲取list快取的內容
     *  @param key   鍵
     * @param start 開始
     * @param end   結束 0 到 -1代表所有值
     * @return
     */
    public List<Object> lGet(String key, long start, long end) {
        try {
            return redisTemplate.opsForList().range(key, start, end);
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
    }


    /**
     * 獲取list快取的長度
     *
     * @param key 鍵
     */
    public long lGetListSize(String key) {
        try {
            return redisTemplate.opsForList().size(key);
        } catch (Exception e) {
            e.printStackTrace();
            return 0;
        }
    }


    /**
     * 通過索引 獲取list中的值
     *
     * @param key   鍵
     * @param index 索引 index>=0時， 0 表頭，1 第二個元素，依次類推；index<0時，-1，表尾，-2倒數第二個元素，依次類推
     */
    public Object lGetIndex(String key, long index) {
        try {
            return redisTemplate.opsForList().index(key, index);
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
    }


    /**
     * 將list放入快取
     *
     * @param key   鍵
     * @param value 值
     */
    public boolean lSet(String key, Object value) {
        try {
            redisTemplate.opsForList().rightPush(key, value);
            return true;
        } catch (Exception e) {
            e.printStackTrace();
            return false;
        }
    }


    /**
     * 將list放入快取
     * @param key   鍵
     * @param value 值
     * @param time  時間(秒)
     */
    public boolean lSet(String key, Object value, long time) {
        try {
            redisTemplate.opsForList().rightPush(key, value);
            if (time > 0)
                expire(key, time);
            return true;
        } catch (Exception e) {
            e.printStackTrace();
            return false;
        }

    }


    /**
     * 將list放入快取
     *
     * @param key   鍵
     * @param value 值
     * @return
     */
    public boolean lSet(String key, List<Object> value) {
        try {
            redisTemplate.opsForList().rightPushAll(key, value);
            return true;
        } catch (Exception e) {
            e.printStackTrace();
            return false;
        }

    }


    /**
     * 將list放入快取
     *
     * @param key   鍵
     * @param value 值
     * @param time  時間(秒)
     * @return
     */
    public boolean lSet(String key, List<Object> value, long time) {
        try {
            redisTemplate.opsForList().rightPushAll(key, value);
            if (time > 0)
                expire(key, time);
            return true;
        } catch (Exception e) {
            e.printStackTrace();
            return false;
        }
    }


    /**
     * 根據索引修改list中的某條資料
     *
     * @param key   鍵
     * @param index 索引
     * @param value 值
     * @return
     */

    public boolean lUpdateIndex(String key, long index, Object value) {
        try {
            redisTemplate.opsForList().set(key, index, value);
            return true;
        } catch (Exception e) {
            e.printStackTrace();
            return false;
        }
    }


    /**
     * 移除N個值為value
     *
     * @param key   鍵
     * @param count 移除多少個
     * @param value 值
     * @return 移除的個數
     */

    public long lRemove(String key, long count, Object value) {
        try {
            Long remove = redisTemplate.opsForList().remove(key, count, value);
            return remove;
        } catch (Exception e) {
            e.printStackTrace();
            return 0;
        }

    }

}

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