Java实现上传和下载功能（支持多个文件同时上传）

  <p>上传者：</p><p>选择文件：</p><p>选择文件：</p>

 <% request.setCharacterEncoding("utf-8"); String uploadFileName = ""; //上传的文件名 String fieldName = ""; //表单字段元素的name属性值 //请求信息中的内容是否是multipart类型 boolean isMultipart = ServletFileUpload.isMultipartContent(request); //上传文件的存储路径（服务器文件系统上的绝对文件路径） String uploadFilePath = request.getSession().getServletContext().getRealPath("upload/" ); if (isMultipart) { FileItemFactory factory = new DiskFileItemFactory(); ServletFileUpload upload = new ServletFileUpload(factory); try { //解析form表单中所有文件 List items = upload.parseRequest(request); Iterator iter = items.iterator(); while (iter.hasNext()) { //依次处理每个文件 FileItem item = (FileItem) iter.next(); if (item.isFormField()){ //普通表单字段 fieldName = item.getFieldName()<span style="color:transparent">来源gaodai#ma#com搞*代#码网</span>; //表单字段的name属性值 if (fieldName.equals("user")){ //输出表单字段的值 out.print(item.getString("UTF-8")+"上传了文件。<br />"); } }else{ //文件表单字段 String fileName = item.getName(); if (fileName != null && !fileName.equals("")) { File fullFile = new File(item.getName()); File saveFile = new File(uploadFilePath, fullFile.getName()); item.write(saveFile); uploadFileName = fullFile.getName(); out.print("上传成功后的文件名是："+uploadFileName); out.print("\t\t下载链接:"+""+uploadFileName+""); out.print("<br />"); } } } } catch (Exception e) { e.printStackTrace(); } } %>

 @Controller public class FileUploadController { @RequestMapping(value="/download") public ResponseEntity download(HttpServletRequest request,HttpServletResponse response,@RequestParam("name") String filename)throws Exception { //下载显示的文件名，解决中文名称乱码问题 filename=new String(filename.getBytes("iso-8859-1"),"UTF-8"); //下载文件路径 String path = request.getServletContext().getRealPath("/upload/"); File file = new File(path + File.separator + filename); HttpHeaders headers = new HttpHeaders(); //下载显示的文件名，解决中文名称乱码问题 String downloadFielName = new String(filename.getBytes("iso-8859-1"),"UTF-8"); //通知浏览器以attachment（下载方式）打开图片 headers.setContentDispositionFormData("Content-Disposition", downloadFielName); //application/octet-stream ： 二进制流数据（最常见的文件下载）。 headers.setContentType(MediaType.APPLICATION_OCTET_STREAM); return new ResponseEntity(FileUtils.readFileToByteArray(file), headers, HttpStatus.CREATED); } }

  <!-- 上传文件大小上限，单位为字节（10MB） --> 10485760<!-- 请求的编码格式，必须和jSP的pageEncoding属性一致，以便正确读取表单的内容，默认为ISO-8859-1 --> UTF-8

   <title>File控件</title>  <p>上传者：</p><p>选择文件：</p><p>选择文件：</p>

   <title>上传处理页面</title> <% request.setCharacterEncoding("utf-8"); String uploadFileName = ""; //上传的文件名 String fieldName = ""; //表单字段元素的name属性值 //请求信息中的内容是否是multipart类型 boolean isMultipart = ServletFileUpload.isMultipartContent(request); //上传文件的存储路径（服务器文件系统上的绝对文件路径） String uploadFilePath = request.getSession().getServletContext().getRealPath("upload/" ); if (isMultipart) { FileItemFactory factory = new DiskFileItemFactory(); ServletFileUpload upload = new ServletFileUpload(factory); try { //解析form表单中所有文件 List items = upload.parseRequest(request); Iterator iter = items.iterator(); while (iter.hasNext()) { //依次处理每个文件 FileItem item = (FileItem) iter.next(); if (item.isFormField()){ //普通表单字段 fieldName = item.getFieldName(); //表单字段的name属性值 if (fieldName.equals("user")){ //输出表单字段的值 out.print(item.getString("UTF-8")+"上传了文件。<br />"); } }else{ //文件表单字段 String fileName = item.getName(); if (fileName != null && !fileName.equals("")) { File fullFile = new File(item.getName()); File saveFile = new File(uploadFilePath, fullFile.getName()); item.write(saveFile); uploadFileName = fullFile.getName(); out.print("上传成功后的文件名是："+uploadFileName); out.print("\t\t下载链接:"+""+uploadFileName+""); out.print("<br />"); } } } } catch (Exception e) { e.printStackTrace(); } } %> 

 package ssm.me.controller; import java.io.File; import java.net.URLDecoder; import java.util.Iterator; import java.util.List; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.apache.commons.fileupload.FileItem; import org.apache.commons.fileupload.FileItemFactory; import org.apache.commons.fileupload.disk.DiskFileItemFactory; import org.apache.commons.fileupload.servlet.ServletFileUpload; import org.apache.commons.io.FileUtils; import org.junit.runners.Parameterized.Parameter; import org.springframework.http.HttpHeaders; import org.springframework.http.HttpStatus; import org.springframework.http.MediaType; import org.springframework.http.ResponseEntity; import org.springframework.stereotype.Controller; import org.springframework.ui.Model; import org.springframework.web.bind.annotation.ModelAttribute; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RequestMethod; import org.springframework.web.bind.annotation.RequestParam; import org.springframework.web.multipart.MultipartFile; @Controller public class FileUploadController { @RequestMapping(value="/download") public ResponseEntity download(HttpServletRequest request,HttpServletResponse response,@RequestParam("name") String filename)throws Exception { //下载显示的文件名，解决中文名称乱码问题 filename=new String(filename.getBytes("iso-8859-1"),"UTF-8"); //下载文件路径 String path = request.getServletContext().getRealPath("/upload/"); File file = new File(path + File.separator + filename); HttpHeaders headers = new HttpHeaders(); //下载显示的文件名，解决中文名称乱码问题 String downloadFielName = new String(filename.getBytes("iso-8859-1"),"UTF-8"); //通知浏览器以attachment（下载方式）打开图片 headers.setContentDispositionFormData("Content-Disposition", downloadFielName); //application/octet-stream ： 二进制流数据（最常见的文件下载）。 headers.setContentType(MediaType.APPLICATION_OCTET_STREAM); return new ResponseEntity(FileUtils.readFileToByteArray(file), headers, HttpStatus.CREATED); } }

   <!-- 一个用于自动配置注解的注解配置 --><!-- 扫描该包下面所有的Controller --><!-- 视图解析器 --> <!-- 上传文件大小上限，单位为字节（10MB） --> 10485760<!-- 请求的编码格式，必须和jSP的pageEncoding属性一致，以便正确读取表单的内容，默认为ISO-8859-1 --> UTF-8

   Student index.htmlindex.htmindex.jspdefault.htmldefault.htmdefault.jsp springmvcorg.springframework.web.servlet.DispatcherServlet<!-- 初始化参数 --> contextConfigLocationclasspath:springmvc.xml1 springmvc*.action contextConfigLocationclasspath:spring/applicationContext-*.xml org.springframework.web.context.ContextLoaderListener