SpringMVC的文件上传与下载

来源：互联网发布：板房保暖知乎编辑：程序博客网时间：2024/04/28 17:06

使用SpringMVC包装的解析器（CommonsMultipartResolver）进行文件上传控制需要引入 apache的 common-fileupload组件包、commons-io、commons-lang、commons-logging等

jsp文件的编写：

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%><%String path = request.getContextPath();String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html>  <head>    <base href="<%=basePath%>">        <title>My JSP 'form.jsp' starting page</title>    <meta http-equiv="pragma" content="no-cache"><meta http-equiv="cache-control" content="no-cache"><meta http-equiv="expires" content="0">    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"><meta http-equiv="description" content="This is my page"><!--<link rel="stylesheet" type="text/css" href="styles.css">-->  </head>    <body>  <form action="${pageContext.request.contextPath}/upload" method="post" enctype="multipart/form-data">文件上传<input type="file" name="myFile" />  <input type="submit" />  </form><a href="${pageContext.request.contextPath}/download.action?fileName=日志、学号.txt">下载文件</a>  </body>    </html>

web.xml配置文件：

<?xml version="1.0" encoding="UTF-8"?><web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"><!-- springmvc --><filter><filter-name>utf</filter-name><filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class><init-param><param-name>encoding</param-name><param-value>UTF-8</param-value></init-param></filter><filter-mapping><filter-name>utf</filter-name><url-pattern>/*</url-pattern></filter-mapping> <filter>  <filter-name>myencode</filter-name>  <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>  <init-param>  <param-name>encoding</param-name>  <param-value>UTF-8</param-value>  </init-param>  </filter> <!-- servlet一般是不支持delete和put  所以要配置一个过滤器 --> <filter> <filter-name>hidden</filter-name> <filter-class>org.springframework.web.filter.HiddenHttpMethodFilter</filter-class> </filter> <filter-mapping> <filter-name>hidden</filter-name> <url-pattern>/*</url-pattern> </filter-mapping>  <!-- 配置action -->  <servlet>  <servlet-name>spring</servlet-name>  <servlet-class>org.springframework.web.servlet.DispatcherServlet </servlet-class>    <init-param>    <param-name>contextConfigLocation</param-name>    <param-value>/WEB-INF/springmvc.xml</param-value>    </init-param>    <load-on-startup>0</load-on-startup>  </servlet>  <servlet-mapping>  <servlet-name>spring</servlet-name>  <url-pattern>*.action</url-pattern>  <url-pattern>/</url-pattern>  </servlet-mapping>  <welcome-file-list>    <welcome-file>index.jsp</welcome-file>  </welcome-file-list></web-app>

springMvc.xml配置文件：

<?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:tx="http://www.springframework.org/schema/tx" xmlns:aop="http://www.springframework.org/schema/aop"xmlns:mvc="http://www.springframework.org/schema/mvc"xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.3.xsdhttp://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.3.xsdhttp://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.3.xsdhttp://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.3.xsdhttp://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.3.xsd"><!--  名称必须使用  multipartResolver 因为spring容器使用名称注入 文件上传解析器--><bean id="multipartResolver"class="org.springframework.web.multipart.commons.CommonsMultipartResolver"><property name="maxUploadSize" value="1048576"></property></bean><!-- 扫描spring注解 --><context:component-scan base-package="cn.et"></context:component-scan><mvc:annotation-driven><mvc:message-converters><bean id="myConvetor" class="cn.et.springmvc.lesson02.message.MyMessageConvertor"><property name="supportedMediaTypes"><list><!-- 设置响应支持的类型 --><value>text/html;charset=UTF-8</value><!-- 设置请求body支持的类型 --><value>application/x-www-form-urlencoded</value></list></property></bean></mvc:message-converters></mvc:annotation-driven></beans>

Action的接受方式——文件上传与下载：

package cn.et.springmvc.lesson02.file;import java.io.File;import java.io.IOException;import java.net.URLEncoder;import javax.servlet.http.HttpServletResponse;import org.springframework.http.HttpHeaders;import org.springframework.http.HttpStatus;import org.springframework.http.ResponseEntity;import org.springframework.stereotype.Controller;import org.springframework.util.FileCopyUtils;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RequestParam;import org.springframework.web.multipart.MultipartFile;@Controllerpublic class SpringIo {private String filePath="D:/file";/** * 文件上传 * @param myFile * @return * @throws IllegalStateException * @throws IOException */@RequestMapping(value="/upload")public String upload(@RequestParam("myFile") MultipartFile myFile, HttpServletResponse response) throws IllegalStateException, IOException{String fileName = myFile.getOriginalFilename();String destFile = filePath+"/"+fileName;myFile.transferTo(new File(destFile));response.getWriter().println("upload success");return null;}/** * 文件下载 * @param myFile * @param response * @return * @throws IOException  * @throws IllegalStateException * @throws IOException */@RequestMapping(value="/download")public ResponseEntity<byte[]> download(String fileName) throws IOException{//需要下载的目标文件File file = new File("D:/file/"+fileName);//读取目标文件为二进制数组byte[] fileByte = FileCopyUtils.copyToByteArray(file)/*FileCopyUtils是工具类，可以直接读取到file文件的byte[]字节数组*/;//设置响应头HttpHeaders hh = new HttpHeaders();//设置下载的文件的名称hh.setContentDispositionFormData("attachment", URLEncoder.encode(fileName, "UTF-8")/* URLEncoder解决中文乱码问题*/);//构建ResponseEntity对象ResponseEntity<byte[]> re = new ResponseEntity<byte[]>(fileByte, hh, HttpStatus.CREATED/*成功的枚举  200*/);return re;}}

如果上传下载出现文件名的乱码问题去看：解决SpringMvc限定请求方法POST推送数据出现的中文乱码问题

在web.xml添加org.springframework.web.filter.CharacterEncodingFilter过滤器即可

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