Spring3 MVC annotation 案例

项目需要用到Spring3.0的MVC和annotation，以前也接触过Spring，不过仅限于自己学习Spring的AOP和IoC，第一次听到Spring的MVC确实有点手足无措。网上参考了几个小案例，整了一下午，终于明白了点。分享一下。

这个Demo中，index.jsp里面有4个链接，分别对应Controller类中的四个方法。第一个与第二个方法同样Mapping的是一个简单的路径，分别return一个ModelAndView和String。第三个方法Mapping一个带参数的链接，第四个方法Mapping一个带路径变量和参数的链接。在方法中做处理后返回要展示的页面和数据。

1）新建一个Dynamic Web Project——SpringMVCDemo

2）引入jar包。包括spring中dist目录下的所有jar包，以及jstl.jar，standard.jar包（JSP页面中的for each标签要用到）和commons-logging-1.1.1.jar包。

3）配置web.xml文件，内容如下：

<?xml version="1.0" encoding="UTF-8"?><web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"id="WebApp_ID" version="3.0"><servlet><servlet-name>springMVCDemo</servlet-name><servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class></servlet><servlet-mapping><servlet-name>springMVCDemo</servlet-name><url-pattern>/</url-pattern></servlet-mapping><welcome-file-list><welcome-file>index.html</welcome-file><welcome-file>index.htm</welcome-file><welcome-file>index.jsp</welcome-file><welcome-file>default.html</welcome-file><welcome-file>default.htm</welcome-file><welcome-file>default.jsp</welcome-file></welcome-file-list></web-app>

4）在web.xml所在路径下新建springMVCDemo-servlet.xml，名字中的springMVCDemo是web.xml中配置的servlet-name，所以这个xml文件的名字是固定的。内容如下：

<?xml version="1.0" encoding="UTF-8"?><beans xmlns="http://www.springframework.org/schema/beans"xmlns:mvc="http://www.springframework.org/schema/mvc" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xmlns:context="http://www.springframework.org/schema/context"xsi:schemaLocation="        http://www.springframework.org/schema/beans        http://www.springframework.org/schema/beans/spring-beans-3.0.xsd        http://www.springframework.org/schema/mvc        http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd        http://www.springframework.org/schema/context          http://www.springframework.org/schema/context/spring-context-3.0.xsd"><mvc:annotation-driven /><!-- 注释资源扫描包路径 --><context:component-scan base-package="org.spring.wayne.controller" /><beanclass="org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping" /><beanclass="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter" /><!-- 对模型视图名称的解析，即在模型视图名称添加前后缀,在requestmapping输入的地址后自动调用该类进行视图解析 --><bean id="viewResolver"class="org.springframework.web.servlet.view.InternalResourceViewResolver"><property name="viewClass"value="org.springframework.web.servlet.view.JstlView" /><property name="prefix" value="/WEB-INF/jsp/" /><!-- 跳转页面的前缀路径 如 /web-inf/jsp/ --><property name="suffix" value=".jsp"></property><!-- 跳转页面后缀 如 helloWorld.jsp --></bean></beans>

5）新建一个POJO类User.java，内容如下：

package org.spring.wayne.model;public class User {private String name;private int age;public User() {}public User(String name, int age) {this.age = age;this.name = name;}public String getName() {return name;}public void setName(String name) {this.name = name;}public int getAge() {return age;}public void setAge(int age) {this.age = age;}}

6）编写Controller类DemoController.java，内容如下：

package org.spring.wayne.controller;import java.util.ArrayList;import java.util.HashMap;import java.util.List;import java.util.Map;import org.spring.wayne.model.User;import org.springframework.stereotype.Controller;import org.springframework.ui.Model;import org.springframework.web.bind.annotation.PathVariable;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RequestParam;import org.springframework.web.servlet.ModelAndView;@Controllerpublic class DemoController {@RequestMapping("/getmav")public ModelAndView getInfo() {ModelAndView mav = new ModelAndView();// 传Stringmav.addObject("title", "Return ModelAndView");// 传ObjectUser user = new User("wayne", 24);mav.addObject("user", user);// 传ListList<User> list = new ArrayList<User>();list.add(new User("wayne1", 12));list.add(new User("wayne2", 24));list.add(new User("wayne3", 34));list.add(new User("wayne4", 45));mav.addObject("list", list);// 传MapMap<String, String> map = new HashMap<String, String>();map.put("name", "wayne");map.put("age", "24");mav.addObject("map", map);mav.setViewName("result");return mav;}@RequestMapping("/string")public String getInfo(Model model) {// 传Stringmodel.addAttribute("title", "Return String");// 传ObjectUser user = new User("wayne", 24);model.addAttribute("user", user);// 传ListList<User> list = new ArrayList<User>();list.add(new User("wayne1", 12));list.add(new User("wayne2", 24));list.add(new User("wayne3", 34));list.add(new User("wayne4", 45));model.addAttribute("list", list);// 传MapMap<String, String> map = new HashMap<String, String>();map.put("name", "wayne");map.put("age", "24");model.addAttribute("map", map);return "result";}@RequestMapping("/strparam")public String getInfo(@RequestParam("name") String name,@RequestParam("age") String age, Model model) {// 传Stringmodel.addAttribute("title", "Return String @RequestParam");// 传ObjectUser user = new User(name, Integer.valueOf(age));model.addAttribute("user", user);// 传ListList<User> list = new ArrayList<User>();list.add(new User(name, Integer.valueOf(age)));list.add(new User(name, Integer.valueOf(age)));list.add(new User(name, Integer.valueOf(age)));list.add(new User(name, Integer.valueOf(age)));model.addAttribute("list", list);// 传MapMap<String, String> map = new HashMap<String, String>();map.put("name", "wayne");map.put("age", "24");model.addAttribute("map", map);return "result";}@RequestMapping("/strparam/{name}")public String getInfor(@PathVariable("name") String name,@RequestParam("age") String age, Model model) {// 传Stringmodel.addAttribute("title", "Return String @PathVariable");// 传ObjectUser user = new User(name, Integer.valueOf(age));model.addAttribute("user", user);// 传ListList<User> list = new ArrayList<User>();list.add(new User(name, Integer.valueOf(age)));list.add(new User(name, Integer.valueOf(age)));list.add(new User(name, Integer.valueOf(age)));list.add(new User(name, Integer.valueOf(age)));model.addAttribute("list", list);// 传MapMap<String, String> map = new HashMap<String, String>();map.put("name", name);map.put("age", age);model.addAttribute("map", map);return "result";}}

7）编写JSP页面，WebContent目录下的index.jsp内容如下：

<%@ page language="java" contentType="text/html; charset=UTF-8"pageEncoding="UTF-8"%><!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>Insert title here</title></head><body><a href="http://localhost:9090/SpringMVCDemo/getmav">http://localhost:9090/SpringMVCDemo/getmav</a><br /><a href="http://localhost:9090/SpringMVCDemo/string">http://localhost:9090/SpringMVCDemo/string</a><br /><ahref="http://localhost:9090/SpringMVCDemo/strparam?name=wayne&age=24">http://localhost:9090/SpringMVCDemo/strparam?name=wayne&age=24</a><br /><ahref="http://localhost:9090/SpringMVCDemo/strparam/name=wayne?age=24">http://localhost:9090/SpringMVCDemo/strparam/name=wayne?age=24</a></body></html>

WebContent/WEB-INF/jsp路径（该路径为springMVCDemo-servlet.xml文件中id为viewResolver的prefix属性所配置）下的result.jsp的内容如下：

<%@ page language="java" contentType="text/html; charset=UTF-8"pageEncoding="UTF-8"%><%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%><!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>Insert title here</title></head><body>This is the result page .<br /> Title: ${title}<br /> Object:<br /> Name: ${user.name}   Age: ${user.age}<br /> List:<br /><c:forEach var="u" items="${list }">Name: ${u.name }  Age: ${u.age }<br /></c:forEach>Map:<br /> Name: ${map.name }  Age: ${map.age}<br /></body></html>

Demo已经完成，运行如下图所示：

打开tomcat，在浏览器中输入http://localhost:9090/SpringMVCDemo/index.jsp后如图所示：

依次打开浏览器中的链接，运行结果如下图所示：

这就是一个完整的简单的Spring MVC Demo ,参考来自网络……#