前言
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Java中的Spring MVC簡介筆記
MVC簡介
Spring MVC基本概念Spring MVC專案搭建
maven
使用
Spring MVC進行開發
實現資料繫結和檔案上傳
MVC
mvc是開發web架構的通用方式.
Front Controller(MVC)前端控制器,Front controller到Controller到View template,使用者頁面.
前端控制器
前端控制器用於分發排程,而控制器用於業務資料抽取,view template用於頁面呈現.
MVC的本質
mvc的本質是將業務資料的抽取與業務邏輯的呈現想分離.(資料和呈現分離).
什麼是所謂的mvc
mvc - Model-View-Controller
程式中的view是檢視層,用於提供ui,是用來呈現資料的.模型層是業務資料的資訊的表示.
模型層:
// 業務資訊的構成
public class Course {
private Integer courseId;
private String title;
private Integer learningNum;
private Integer level;
private String imgPath;
private List<Chapter> chapterList;
public Integer getCourseId(){
return courseId;
}
public void setCourseId(Integer courseId){
this.courseId = courseId;
}
public String getTitle(){
return title;
}
public void setTitle(String title){
this.title = title;
}
public Integer getLearningNum(){
return learningNum;
}
}
複製程式碼檢視和模型- Controller控制器,控制層,作用是將資料傳遞給檢視層,用於呈現.
mvc是一種架構模式,用於呈現的分層,分工合作,模型層,檢視層,控制層.
spring mvc概念:
DispatcherServlet
controller - HandlerAdapter表現形式
集合
DispatcherServlet
Controller
HandlerAdapter
HandlerInterceptor
HandlerMapping
HandlerExecutionChain
ModelAndView
ViewResolver
View
複製程式碼DispatcherServlet重點
View Controller DispatcherServlet -> Request -> HandlerMapping -> Controller -> HandlerInterceptor -> Hander/HandlerAdapter
ModelAndView -> DispatcherServlet -> ViewResolver -> View -> Response
結構
DispatcherServlet
Common Services ->
Locale Resolution
Theme Resolution
Multipart(File Upload) Handing
複製程式碼Controller
HandlerMapping
HandlerInterceptor
Handler
-Data Binding
-Validation, Type Conversion, Formatting
-Invoke Service Layer
-Update Model and State
HandlerExceptionResolver
複製程式碼View
ViewResolver
View
複製程式碼spring mvc專案搭建-maven
// maven
pom(project object model) - an xml file(pom.xml)
// contains information
dependency management
coordinates
複製程式碼
座標Coordinates
groupId
artifactId
version
packaging
複製程式碼maven安裝
下載解壓maven,配置環境變數,(M2_HOME,Path),配置maven配置檔案.
(M2_HOME,Path)
配置檔案:
%HOME%\.m2
複製程式碼複製settings.xml檔案到.m2下
開啟.m2下檔案settings.cml檔案
配置:
<mirror>
<id>UK</id>
<name>UK Central</name>
<url>http://uk.maven.org/maven2</url>
<mirrorOf>central</mirrorOf>
</mirror>
複製程式碼maven建立專案
eclipse -> eclipse kepler sr2 packages
eclipse -> window -> preferences -> maven -> Installations -> add -> 'maven-apache-maven-x.x.x->user settings`中確保路徑正確.
mvn archetype:generate -DgroupId=dashucoding-arthur -DartifactId=spring-mvc-study
-DarchetypeArtifactId=maven-archetype-webapp
複製程式碼
點選Enter鍵-都Enter鍵
專案
Import -> maven -> existion maven projects -> spring-mvc-study /pom.xml
spring-mvc-study -> properties -> java build path -> spring-mvc-study/src/main/java(missing)
main -> folder -> java -> pom.xml
packaging: jar
複製程式碼點選pom.xml
@Controller
@RequestMapping("/hello")
public class HelloMvcController{
@RequestMapping("/mvc");
// host:8080/hello/mvc
public String helloMvc(){
return "home";
}
}
複製程式碼
mvn jetty:run
複製程式碼spring mvc操作
DispatcherServlet
WebApplicationContext
WebApplication
複製程式碼
controller
model
service
複製程式碼@Controller
@RequestMapping("/courses")
public class CourseController {
private static Logger log = LoggerFactory.getLogger(CourseController.class);
private CourseService courseService;
}
複製程式碼
Controller
@Controller
@RequestMapping
URL template(@RequestParam and @PathVarialbe)
HttpServletRequest and / or HttpSession
複製程式碼Binding繫結
是將請求中的欄位按照名字匹配的原則填入模型物件.
CourseController.java
@RequestMapping(value="/admin", method=RequestMethod.GET, params="add")
public String createCourse(){
return "course_admin/edit";
}
複製程式碼
package com.model;
複製程式碼
FileUpload單檔案上傳
檔案上傳:
<dependency>
<groupId> commons-fileupload </groupId>
<artifactId> commons-fileupload </artifactId>
<version>1.3.1</version>
</dependency>
複製程式碼JSON
json是一種輕量級的格式
複製程式碼ContentNegotiatingViewResolver
ResponseEntity
@ResponseBody/@ResquestBody
複製程式碼知識點
@RequestMapping
@PathVariable
@Controller
redirect/forward
MultipartFile
@ModelAttribute
@ResquestBody
@RequestParam
@ResponseBody
enctype="multipart/form-data"
multipartResolver
ResponseEntity
複製程式碼達叔小生：往後餘生，唯獨有你 You and me, we are family ! 90後帥氣小夥，良好的開發習慣；獨立思考的能力；主動並且善於溝通 簡書部落格： 達叔小生 www.jianshu.com/u/c785ece60…
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