<?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" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5">       <!-- 配置SpringMVC的DispatcherServlet -->    <servlet>        <servlet-name>springDispatcherServlet</servlet-name>        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>        <init-param>            <param-name>contextConfigLocation</param-name>            <param-value>classpath:springmvc.xml</param-value>        </init-param>        <load-on-startup>1</load-on-startup>    </servlet>    <servlet-mapping>        <servlet-name>springDispatcherServlet</servlet-name>        <url-pattern>/</url-pattern>    </servlet-mapping>      <!-- 配置 HiddenHttpMethodFilter: 把 POST 请求转为 DELETE、PUT 请求 -->      <filter>          <filter-name>HiddenHttpMethodFilter</filter-name>          <filter-class>org.springframework.web.filter.HiddenHttpMethodFilter</filter-class>      </filter>            <filter-mapping>          <filter-name>HiddenHttpMethodFilter</filter-name>          <url-pattern>/*</url-pattern>      </filter-mapping>  </web-app>

<?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:context="http://www.springframework.org/schema/context"    xmlns:mvc="http://www.springframework.org/schema/mvc"    xsi:schemaLocation="http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd        http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd">        <!-- 配置自动扫描的包 -->    <context:component-scan base-package="com.atguigu.springmvc"></context:component-scan>        <!-- 配置视图解析器 -->    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">        <property name="prefix" value="http://www.mamicode.com/WEB-INF/views/"></property>        <property name="suffix" value="http://www.mamicode.com/.jsp"></property>    </bean>        <!--          default-servlet-handler 将在 SpringMVC 上下文中定义一个 DefaultServletHttpRequestHandler,        它会对进入 DispatcherServlet 的请求进行筛查, 如果发现是没有经过映射的请求, 就将该请求交由 WEB 应用服务器默认的         Servlet 处理. 如果不是静态资源的请求，才由 DispatcherServlet 继续处理        一般 WEB 应用服务器默认的 Servlet 的名称都是 default.        若所使用的 WEB 服务器的默认 Servlet 名称不是 default，则需要通过 default-servlet-name 属性显式指定            -->    <mvc:default-servlet-handler/>        <!-- 一般都会配置这个 <mvc:annotation-driven ></mvc:annotation-driven>，    由于。。。requestmapping请求实现不了，使用这个，会使requestmapping请求一定实现    -->    <mvc:annotation-driven ></mvc:annotation-driven>       </beans>

@Controllerpublic class SpringMVCTest {        @Autowired    private EmployeeDao employeeDao;    //实现文件的下载    //需要说明的是文件的上传和下载不需要其他配置    @RequestMapping("testResponseEntity")    public ResponseEntity<byte[]> testResponseEntity(HttpSession session) throws IOException{                byte[] body=null;        ServletContext servletContext=session.getServletContext();        ///files/abc.txt：所要下载文件的地址        InputStream in=servletContext.getResourceAsStream("/files/abc.txt");        body=new byte[in.available()];        in.read(body);                HttpHeaders headers=new HttpHeaders();        //响应头的名字和响应头的值        headers.add("Content-Disposition", "attachment;filename=abc.txt");                HttpStatus statusCode=HttpStatus.OK;                ResponseEntity<byte[]> response=new ResponseEntity<byte[]>(body, headers, statusCode);        return response;    }        //实现文件上传    @ResponseBody    @RequestMapping("/testHttpMessageConverter")    public String testHttpMessageConverter(@RequestBody String body){        System.out.println(body);        return "helloworld!"+new Date();    }    }

<%@ 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>        <center>       <!-- 文件上传的表单 -->    <form action="testHttpMessageConverter" method="post" enctype="multipart/form-data">        File: <input type="file" name="file"/>        Desc: <input type="text" name="desc"/>        <input type="submit" value="http://www.mamicode.com/Submit"/>    </form>    <br><br>        <!-- 文件的下载 -->    <a href="http://www.mamicode.com/testResponseEntity">Test ResponseEntity</a>        </center>    </body></html>