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 复制代码
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 复制代码
Controller
HandlerMapping HandlerInterceptor Handler -Data Binding -Validation, Type Conversion, Formatting -Invoke Service Layer -Update Model and State HandlerExceptionResolver 复制代码
View
ViewResolver View 复制代码
spring mvc 项目搭建- maven
// maven pom(project object model) - an xml file(pom.xml) // contains information dependency management coordinates 复制代码
坐标 Coordinates
groupId artifactId version packaging 复制代码
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 复制代码
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 复制代码
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 复制代码
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 复制代码
spring mvc 操作
DispatcherServlet WebApplicationContext WebApplication 复制代码
controller model service 复制代码
@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 复制代码
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; 复制代码
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> 复制代码
JSON
json是一种轻量级的格式 复制代码
ContentNegotiatingViewResolver ResponseEntity @ResponseBody/@ResquestBody 复制代码
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