Spring mvc demo 案例 初学者的天堂
首先去Spring官网上去下载最新的Spring版本。http://www.springsource.com/download/community
目前最新的版本是3.1 M2。下载完后解压，将dist目录下的所有jar文件复制到你的项目的lib目录下（我在MyEclipse中新建了一个myapp的Web项目），另外再添加如下的JAR包，
commons-fileupload-1.2.1.jar
commons-logging-1.1.1.jar
在web. xml中添加：
<context-param> <param-name>contextConfigLocation</param-name> <param-value>/WEB-INF/applicationContext.xml</param-value> </context-param> <listener> <listener-class> org.springframework.web.context.ContextLoaderListener </listener-class> </listener> <servlet> <servlet-name>spring</servlet-name> <servlet-class> org.springframework.web.servlet.DispatcherServlet </servlet-class> <load-on-startup>1</load-on-startup> </servlet> <servlet-mapping> <servlet-name>spring</servlet-name> <url-pattern>*.do</url-pattern> </servlet-mapping> <filter> <filter-name>Encoding</filter-name> <filter-class> org.springframework.web.filter.CharacterEncodingFilter </filter-class> <init-param> <param-name>encoding</param-name> <param-value>utf8</param-value> </init-param> </filter> <filter-mapping> <filter-name>Encoding</filter-name> <url-pattern>/*</url-pattern> </filter-mapping>
另外在WEB-INF下新建applicationContext.xml
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:aop="http://www.springframework.org/schema/aop" xmlns:context="http://www.springframework.org/schema/context"
xmlns:p="http://www.springframework.org/schema/p" xmlns:tx="http://www.springframework.org/schema/tx"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="
http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd
http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.0.xsd
http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.0.xsd">
<context:annotation-config />
<context:component-scan base-package="org.app.demo.spring" /> <!-- 自动扫描所有注解该路径 -->
</beans>
在WEB-INF下新建spring-servlet.xml
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:p="http://www.springframework.org/schema/p"
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/aop http://www.springframework.org/schema/aop/spring-aop-3.0.xsd
http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.0.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd">
<context:annotation-config />
<!-- 把标记了@Controller注解的类转换为bean -->
<context:component-scan base-package="org.app.demo.spring.controller" />
<!-- 启动Spring MVC的注解功能，完成请求和注解POJO的映射 -->
<bean class="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 -->
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"
p:prefix="/WEB-INF/views/" p:suffix=".jsp" />
<bean id="multipartResolver"
class="org.springframework.web.multipart.commons.CommonsMultipartResolver"
p:defaultEncoding="utf-8" />
</beans>
在源目录下新建三个包
org.app.demo.spring.controller org.app.demo.spring.service org.app.demo.spring.service.impl
在controller包下建HelloWorldController类
package org.app.demo.spring.controller;
import javax.servlet.http.HttpServletRequest;
import org.app.demo.spring.service.HelloWorldService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
@Controller
@RequestMapping("/helloworld.do")
public class HelloWorldController{
@Autowired
private HelloWorldService helloWorldService;
@RequestMapping
public String getNewName(@RequestParam("userName") String userName, HttpServletRequest request){
String newUserName = helloWorldService.getNewName(userName);
request.setAttribute("newUserName", newUserName);
return "helloworld";
}
}
在service包下新建HelloWorldService接口
package org.app.demo.spring.service;
public interface HelloWorldService {
public String getNewName(String userName);
}
在impl包下新建HelloWorldService接口的实现类HelloWorldServiceImpl类
package org.app.demo.spring.service.impl;
import org.app.demo.spring.service.HelloWorldService;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
@Service
public class HelloWorldServiceImpl implements HelloWorldService {
@Override
@Transactional
public String getNewName(String userName) {
return "Hello Spring!" + userName;
}
}
新建index.jsp
<%@ 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>
<link rel="stylesheet" type="text/css" href="http://wjjcml1982.blog.163.com/blog/css/db_browser.css">
</head>
<body>
<form action="helloworld.do" method="post">
请输入姓名：<input type="text" name="userName" />
<input type="submit" value="提交" />
<br />
</form>
</body>
</html>
然后再WEB-INF目录下新建views目录，在views目录下新建helloworld.jsp
<%@ 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>
<link rel="stylesheet" type="text/css" href="http://wjjcml1982.blog.163.com/blog/css/db_browser.css">
</head>
<body>
<h1><%=request.getAttribute("newUserName")%></h1>
</body>
</html>
保存完后布置到Tomcat中，启动Tomcat,访问http://localhost:8080/myapp/index.jsp
输入姓名（如张三）后,页面会跳转到http://localhost:8080/myapp/helloworld.do。
显示Hello Spring！张三。一切OK!