SpringMVC上传下载

springmvc上传下载功能 参照网上代码写了一个简单的例子

 

1、需要导入jar包：ant.jar、commons-fileupload.jar、connom-io.jar。当然spring jar包不可缺少的哦  我这里用的是spring+springmvc+hibernate  可以到官网上直接下载springmvcjar即可

2、springmvc.xml配置

<?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/beans http://www.springframework.org/schema/beans/spring-beans.xsdhttp://www.springframework.org/schema/contexthttp://www.springframework.org/schema/context/spring-context-3.2.xsdhttp://www.springframework.org/schema/mvchttp://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd"><!-- 扫描包 --><context:component-scan base-package="com.ai.customer" /> <!-- 启动注解 --> <mvc:annotation-driven /><!-- 文件上传 --> <bean id="multipartResolver"     class="org.springframework.web.multipart.commons.CommonsMultipartResolver">   <!-- 设置上传文件的最大尺寸为10MB -->     <property name="maxUploadSize">         <value>10000000</value>     </property>    </bean>  <!--  静态文件访问 --> <mvc:default-servlet-handler/>  <!-- 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" >  <property name="prefix" value="/"/> <property name="suffix" value=".jsp"/> </bean>  </beans>

3、web.xml配置

<servlet>    <servlet-name>spring</servlet-name>    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>    <init-param>      <param-name>contextConfigLocation</param-name>      <param-value>classpath*:config/spring/spring-*.xml</param-value>    </init-param>    <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>codeUTF-8</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>    <init-param>      <param-name>forceEncoding</param-name>      <param-value>true</param-value>    </init-param>  </filter>  <filter-mapping>    <filter-name>codeUTF-8</filter-name>    <url-pattern>/*</url-pattern>  </filter-mapping>

4、程序代码块

package com.ai.customer.controller;import java.io.BufferedInputStream;import java.io.BufferedOutputStream;import java.io.File;import java.io.FileInputStream;import java.io.IOException;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import org.apache.commons.fileupload.FileUpload;import org.apache.commons.io.FileUtils;import org.springframework.stereotype.Controller;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RequestParam;import org.springframework.web.multipart.MultipartFile;import org.springframework.web.servlet.ModelAndView;@Controllerpublic class FileUploadController {/* * SpringMVC中的文件上传 * @第一步：由于SpringMVC使用的是commons-fileupload实现，故将其组件引入项目中 * @这里用到的是commons-fileupload-1.2.1.jar和commons-io-1.3.2.jar * @第二步：spring-mvx中配置MultipartResolver处理器。可在此加入对上传文件的属性限制 *  <bean id="multipartResolver"   *  class="org.springframework.web.multipart.commons.CommonsMultipartResolver"> *     <!-- 设置上传文件的最大尺寸为10MB -->   *        <property name="maxUploadSize">   *            <value>10000000</value>   *         </property>   * </bean>  * 第三步：在Controller的方法中添加MultipartFile参数。该参数用于接收表单中file组件的内容 *第四步：编写前台表单。注意enctype="multipart/form-data"以及<input type="file" name="****"/> *  如果是单个文件 直接使用MultipartFile 即可 */ /**********************上传代码**************************/@RequestMapping("/upload.do")public ModelAndView upload(String name,//上传多个文件@RequestParam("file") MultipartFile[] file,HttpServletRequest request) throws IllegalStateException,IOException {//获取文件 存储位置String realPath = request.getSession().getServletContext().getRealPath("/uploadFile");File pathFile = new File(realPath);if (!pathFile.exists()) {//文件夹不存 创建文件pathFile.mkdirs();}for (MultipartFile f : file) {System.out.println("文件类型："+f.getContentType());System.out.println("文件名称："+f.getOriginalFilename());System.out.println("文件大小:"+f.getSize());System.out.println(".................................................");//将文件copy上传到服务器f.transferTo(new File(realPath + "/" + f.getOriginalFilename())); //FileUtils.copy}//获取modelandview对象ModelAndView view = new ModelAndView();view.setViewName("redirect:index.jsp");return view;}/********下载代码*************/    @RequestMapping(value = "download.do")      public ModelAndView download(HttpServletRequest request,              HttpServletResponse response) throws Exception {    //        String storeName = "Spring3.xAPI_zh.chm";      String storeName="房地.txt";        String contentType = "application/octet-stream";          FileUploadController.download(request, response, storeName, contentType);          return null;      }              //文件下载 主要方法    public static void download(HttpServletRequest request,              HttpServletResponse response, String storeName, String contentType           ) throws Exception {              request.setCharacterEncoding("UTF-8");          BufferedInputStream bis = null;          BufferedOutputStream bos = null;            //获取项目根目录        String ctxPath = request.getSession().getServletContext()                  .getRealPath("");                  //获取下载文件露肩        String downLoadPath = ctxPath+"/uploadFile/"+ storeName;            //获取文件的长度        long fileLength = new File(downLoadPath).length();          //设置文件输出类型        response.setContentType("application/octet-stream");          response.setHeader("Content-disposition", "attachment; filename="                  + new String(storeName.getBytes("utf-8"), "ISO8859-1"));         //设置输出长度        response.setHeader("Content-Length", String.valueOf(fileLength));          //获取输入流        bis = new BufferedInputStream(new FileInputStream(downLoadPath));          //输出流        bos = new BufferedOutputStream(response.getOutputStream());          byte[] buff = new byte[2048];          int bytesRead;          while (-1 != (bytesRead = bis.read(buff, 0, buff.length))) {              bos.write(buff, 0, bytesRead);          }          //关闭流        bis.close();          bos.close();      }   }  

5、jsp页面代码 注意：设置表单中form表单的属性为：enctype="multipart/form-data"

<%@ 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><form action="upload.do" method="post" enctype="multipart/form-data"><input type="text" name="name" /><br><input type="file" name="file"><br><input type="file" name="file" /><input type="submit" value="提交"></form></body></html>