servlet上传下载进度条源码

package com.jcpower.servlet; import java.io.File; import java.io.FileNotFoundException; import java.io.IOException; import java.io.PrintWriter; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.apache.commons.fileupload.FileItem; import org.apache.commons.fileupload.FileUploadBase.FileSizeLimitExceededException; import org.apache.commons.fileupload.FileUploadException; import org.apache.commons.fileupload.disk.DiskFileItemFactory; import org.apache.commons.fileupload.servlet.ServletFileUpload; import com.jcpower.listener.UploadProgress; public class UploadServlet extends HttpServlet { private static final long serialVersionUID = 3280493783522943335L; public void doGet(HttpServletRequest request,HttpServletResponse response) throws ServletException,IOException { this.doPost(request, response); } public void doPost(HttpServletRequest request,HttpServletResponse response) throws ServletException,IOException { request.setCharacterEncoding("utf-8"); response.setContentType("text/html"); response.setCharacterEncoding("utf-8"); PrintWriter out = response.getWriter(); //实例化一个硬盘文件工厂 DiskFileItemFactory dfif = new DiskFileItemFactory(); //设置缓冲区的大小 3M 默认10k 单位是byte dfif.setSizeThreshold(1024*1024*3); //设置临时文件夹 加入数据超过缓冲区大小 则会存入临时文件夹 dfif.setRepository(new File(request.getServletContext().getRealPath("/")+"WEB-INF/uploadTemp/")); //定义文件上传组件 ServletFileUpload sfu = new ServletFileUpload(dfif); //设置上传组件的编码 sfu.setHeaderEncoding("utf-8"); //设置单个文件的大小 sfu.setFileSizeMax(1024*1024*100); //设置上传文件的总大小 sfu.setSizeMax(1024*1024*2000); //给上传组件设置监听 上传过程中实时返回已上传文件的大小 sfu.setProgressListener(new UploadProgress(request)); //判断表单是否是Multipart类型 if(ServletFileUpload.isMultipartContent(request)) { try { //把request转换成FileItem对象集合 循环遍历 找到file类型 for(FileItem fileItem:sfu.parseRequest(request)) { //非file对象 if(fileItem.isFormField()) { //System.out.println(fileItem.getFieldName()+"-----"+new String(fileItem.getString().getBytes("iso-8859-1"),"utf-8")); }else{ //如果文件存在并且大小不为0 if(fileItem.getName()!=null && fileItem.getSize()>0) { //获取文件的名字 包括后缀 String fileName = fileItem.getName().substring(fileItem.getName().lastIndexOf("\\")+1); //String ext = fileName.substring(fileName.lastIndexOf(".")); //String randomFileName = UUID.randomUUID().toString()+ext;//System.currentTimeMillis()+ext; //方式一：FileItem.write();上传完自动删除临时文件夹的内容 //获取对应file对象的输入流 并写入到服务器指定文件夹 fileItem.write(new File(request.getServletContext().getRealPath("/")+"WEB-INF/upload/"+fileName)); //方式二：自己用io实现上传 需要手动删除临时文件内容 /*InputStream is = fileItem.getInputStream(); OutputStream os = new FileOutputStream(new File(request.getServletContext().getRealPath("/")+"WEB-INF/upload/"+randomFileName)); byte [] buffer = new byte[1024]; int len; while((len=is.read(buffer))!=-1) { os.write(buffer, 0, len); } os.close(); is.close(); fileItem.delete();*/ out.println("<script>"); out.println("function fileDown(obj,fname){obj.href='downloadServlet?fileName='+encodeURI(fname);}"); out.println("</script>"); out.println("文件名称："+fileName+"<br><br>文件大小："+fileItem.getSize()+" Byte<br><br><a href='javascript:void(0);' onclick=fileDown(this,'"+fileName+"')>下载</a>"); }else{ out.println("文件长度不能为0！"); } } } }catch (FileNotFoundException e){ out.println("请选择要上传的文件！"); }catch (FileSizeLimitExceededException e){ out.println("上传文件的大小超过允许的范围！"); }catch (FileUploadException e) { e.printStackTrace(); } catch (Exception e) { e.printStackTrace(); } }else{ out.println("此表单为普通表单！不能进行上传操作。"); } } }