在eclipse中的javaEE环境下：导入必要的架包
web.xml的配置文件：
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<?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>
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spring的bean的配置文件springmvc.xml;
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<?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="/WEB-INF/views/"></property>
<property name="suffix" value=".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>
<!-- 配置 MultipartResolver ，即配置文件上传的属性-->
<bean id="multipartResolver"
class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
<!-- 默认的字符编码 -->
<property name="defaultEncoding" value="UTF-8"></property>
<!-- 上传文件的大小 ,最大上传大小-->
<property name="maxUploadSize" value="1024000"></property>
</bean>
</beans>
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@Controller
public 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;
}
//文件上传，
@RequestMapping("/testFileUpload")
public String testFileUpload(@RequestParam("desc") String desc,
@RequestParam("file") MultipartFile file) throws IOException{
System.out.println("desc:"+desc);
System.out.println("OriginalFilename"+file.getOriginalFilename());
System.out.println("InputStream"+file.getInputStream());
return "success";
}
}
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jsp页面：index.jsp：
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<%@ 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="testFileUpload" method="post" enctype="multipart/form-data">
File:<input type="file" name="file"/>
Desc:<input type="text" name="desc"/>
<input type="submit" value="Submit"/>
</form>
<br><br>
<!-- 文件的下载 -->
<a href="testResponseEntity" rel="external nofollow" >Test ResponseEntity</a>
</center>
</body>
</html>
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<%@ 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>
<h3>Success page</h3>
</body>
</html>
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以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持快网idc。
原文链接：http://www.cnblogs.com/lxnlxn/p/5938861.html
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