第63节:Java中的Spring MVC简介笔记

mvc 是开发 web 架构的通用方式.

Front Controller(MVC) 前端控制器, Front controller 到 Controller 到 View template ,用户页面.

前端控制器

前端控制器用于分发调度,而控制器用于业务数据抽取, view template 用于页面呈现.

MVC 的本质

mvc 的本质是将业务数据的抽取与业务逻辑的呈现想分离.(数据和呈现分离).

什么是所谓的 mvc

mvc - Model-View-Controller

程序中的 view 是视图层,用于提供 ui ,是用来呈现数据的.模型层是业务数据的信息的表示.

模型层:

// 业务信息的构成
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;
 }
}
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视图和模型- Controller 控制器,控制层,作用是将数据传递给视图层,用于呈现.

mvc 是一种架构模式,用于呈现的分层,分工合作,模型层,视图层,控制层.

spring mvc 概念:

DispatcherServlet

controller - HandlerAdapter 表现形式

集合

DispatcherServlet
Controller
HandlerAdapter
HandlerInterceptor
HandlerMapping
HandlerExecutionChain
ModelAndView
ViewResolver
View
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DispatcherServlet 重点

View Controller DispatcherServlet -> Request -> HandlerMapping -> Controller -> HandlerInterceptor -> Hander/HandlerAdapter

ModelAndView -> DispatcherServlet -> ViewResolver -> View -> Response

结构

DispatcherServlet

Common Services ->

Locale Resolution
Theme Resolution
Multipart(File Upload) Handing
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Controller

HandlerMapping
HandlerInterceptor
Handler
-Data Binding
-Validation, Type Conversion, Formatting
-Invoke Service Layer
-Update Model and State
HandlerExceptionResolver
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View

ViewResolver
View
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spring mvc 项目搭建- maven

// maven
pom(project object model) - an xml file(pom.xml)
// contains information
dependency management
coordinates
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坐标 Coordinates

groupId
artifactId
version
packaging
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maven 安装

下载解压 maven ,配置环境变量,( M2_HOME,Path ),配置 maven 配置文件.

(M2_HOME,Path)

配置文件:

%HOME%\.m2
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复制 settings.xml 文件到 .m2 下

打开 .m2 下文件 settings.cml 文件

配置:

<mirror>
     	<id>UK</id>
     	<name>UK Central</name>
     	<url>http://uk.maven.org/maven2</url>
     	<mirrorOf>central</mirrorOf>
     </mirror>
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maven 创建项目

eclipse -> eclipse kepler sr2 packages

eclipse -> window -> preferences -> maven -> Installations -> add -> 'maven - apache-maven-x.x.x -> user settings`中确保路径正确.

mvn archetype:generate -DgroupId=dashucoding-arthur -DartifactId=spring-mvc-study
-DarchetypeArtifactId=maven-archetype-webapp
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点击回车键-都回车键

项目

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
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点击 pom.xml

@Controller
@RequestMapping("/hello")
public class HelloMvcController{
 @RequestMapping("/mvc");
 // host:8080/hello/mvc
 public String helloMvc(){
  return "home";
 }
}
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mvn jetty:run
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spring mvc 操作

DispatcherServlet
WebApplicationContext
WebApplication
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controller
model
service
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@Controller
@RequestMapping("/courses")
public class CourseController {
 private static Logger log = LoggerFactory.getLogger(CourseController.class);
 private CourseService courseService;
}
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Controller

@Controller
@RequestMapping
URL template(@RequestParam and @PathVarialbe)
HttpServletRequest and / or HttpSession
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Binding 绑定

是将请求中的字段按照名字匹配的原则填入模型对象.

CourseController.java

@RequestMapping(value="/admin", method=RequestMethod.GET, params="add")
public String createCourse(){
 return "course_admin/edit";
}
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package com.model;
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FileUpload 单文件上传

文件上传:

<dependency>
 <groupId> commons-fileupload </groupId>
 <artifactId> commons-fileupload </artifactId>
 <version>1.3.1</version>
</dependency>
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JSON

json是一种轻量级的格式
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ContentNegotiatingViewResolver
ResponseEntity
@ResponseBody/@ResquestBody
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