前言
在一個web專案中,某些頁面是可以匿名訪問的,但有些頁面則不能。spring mvc提供了HandlerInterceptor介面來應對,只需要重寫preHandle方法便可以實現此功能。那麼使用spring boot是怎麼實現的呢?
一、準備工作
pom.xml:
<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 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>com.github.carter659</groupId> <artifactId>spring13</artifactId> <version>0.0.1-SNAPSHOT</version> <packaging>jar</packaging> <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>1.4.3.RELEASE</version> </parent> <name>spring13</name> <url>http://maven.apache.org</url> <properties> <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> <java.version>1.8</java.version> </properties> <dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-thymeleaf</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-devtools</artifactId> <optional>true</optional> </dependency> </dependencies> <build> <plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> </plugin> </plugins> </build> </project>
與以往的pom.xml沒有任何不同
App.java
package com.github.carter659.spring13; import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; /** * 入口類 部落格出處:http://www.cnblogs.com/GoodHelper/ * */ @SpringBootApplication public class App { public static void main(String[] args) { SpringApplication.run(App.class, args); } }
二、具體實現
1.新建控制器“MainController”檔案:
package com.github.carter659.spring13; import java.util.HashMap; import java.util.Map; import javax.servlet.http.HttpSession; import org.springframework.stereotype.Controller; import org.springframework.ui.Model; import org.springframework.web.bind.annotation.GetMapping; import org.springframework.web.bind.annotation.PostMapping; import org.springframework.web.bind.annotation.ResponseBody; import org.springframework.web.bind.annotation.SessionAttribute; /** * 控制器 部落格出處:http://www.cnblogs.com/GoodHelper/ * */ @Controller public class MainController { @GetMapping("/") public String index(@SessionAttribute(WebSecurityConfig.SESSION_KEY) String account, Model model) { model.addAttribute("name", account); return "index"; } @GetMapping("/login") public String login() { return "login"; } @PostMapping("/loginPost") public @ResponseBody Map<String, Object> loginPost(String account, String password, HttpSession session) { Map<String, Object> map = new HashMap<>(); if (!"123456".equals(password)) { map.put("success", false); map.put("message", "密碼錯誤"); return map; } // 設定session session.setAttribute(WebSecurityConfig.SESSION_KEY, account); map.put("success", true); map.put("message", "登入成功"); return map; } @GetMapping("/logout") public String logout(HttpSession session) { // 移除session session.removeAttribute(WebSecurityConfig.SESSION_KEY); return "redirect:/login"; } }
講解MainController:
這裡的四個方法分別是:登入後的頁面、登入頁面、登入ajax後臺方法和登出。
“loginPost”方法判斷當密碼為“123456”時則設定session
“index”方法用來顯示session
“logout”方法用來移除session
2.新建“WebSecurityConfig”類檔案:
package com.github.carter659.spring13; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import javax.servlet.http.HttpSession; import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration; import org.springframework.web.servlet.config.annotation.InterceptorRegistration; import org.springframework.web.servlet.config.annotation.InterceptorRegistry; import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter; import org.springframework.web.servlet.handler.HandlerInterceptorAdapter; /** * 登入配置 部落格出處:http://www.cnblogs.com/GoodHelper/ * */ @Configuration public class WebSecurityConfig extends WebMvcConfigurerAdapter { /** * 登入session key */ public final static String SESSION_KEY = "user"; @Bean public SecurityInterceptor getSecurityInterceptor() { return new SecurityInterceptor(); } public void addInterceptors(InterceptorRegistry registry) { InterceptorRegistration addInterceptor = registry.addInterceptor(getSecurityInterceptor()); // 排除配置 addInterceptor.excludePathPatterns("/error"); addInterceptor.excludePathPatterns("/login**"); // 攔截配置 addInterceptor.addPathPatterns("/**"); } private class SecurityInterceptor extends HandlerInterceptorAdapter { @Override public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception { HttpSession session = request.getSession(); if (session.getAttribute(SESSION_KEY) != null) return true; // 跳轉登入 String url = "/login"; response.sendRedirect(url); return false; } } }
“SecurityInterceptor”類繼承“HandlerInterceptorAdapter”,並重新“preHandle”方法,當session為空時,則跳轉到登入頁面
“WebSecurityConfig”類繼承“WebMvcConfigurerAdapter”,重新“addInterceptors”方法,其目的是設定攔截規則,excludePathPatterns為需要排除的規則,addPathPatterns為需要攔截的規則。
三、頁面
index.html:
<!DOCTYPE html> <html xmlns:th="http://www.thymeleaf.org"> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /> <title>玩轉spring boot——簡單登入認證</title> </head> <body> <h1>玩轉spring boot——簡單登入認證</h1> <h4> <a href="http://www.cnblogs.com/GoodHelper/">from 劉冬的部落格</a> </h4> <h3 th:text="'登入使用者:' + ${name}"></h3> <a href="/logout">登出</a> <br /> <a href="http://www.cnblogs.com/GoodHelper/">點選訪問原版部落格(www.cnblogs.com/GoodHelper)</a> </body> </html>
<!DOCTYPE html> <html xmlns:th="http://www.thymeleaf.org"> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /> <title>玩轉spring boot——簡單登入認證</title> </head> <body> <h1>玩轉spring boot——簡單登入認證</h1> <h4> <a href="http://www.cnblogs.com/GoodHelper/">from 劉冬的部落格</a> </h4> <h3 th:text="'登入使用者:' + ${name}"></h3> <a href="/logout">登出</a> <br /> <a href="http://www.cnblogs.com/GoodHelper/">點選訪問原版部落格(www.cnblogs.com/GoodHelper)</a> </body> </html>
四、執行效果
1.輸入錯誤的密碼後無法登陸
2.輸入正確密碼後調整到首頁
3.在首頁顯示了登入後的賬號
4.點選登出後返回登入頁面
5.在未登入的情況下,直接輸入首頁網站“http://localhost:8080”後,無法進入首頁,會強制跳轉到登入頁面。
程式碼:https://github.com/carter659/spring-boot-13.git
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