http://www.cnblogs.com/dong-xu/p/6701271.html
此博文甚好，项目参照博主代码可实现。
前端页面：
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <%@taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%> <%@page isErrorPage="true" %> <!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></title> <script type="text/javascript" src="../js/jquery-2.1.1.js"></script> <link rel="stylesheet" type="text/css" href="../css/css.css" /> <style type="text/css"> .loading{ background-image: url(../img/1352886927_7549.gif); width: 35px; height: 35px; display: inline-block; float: left; margin-left: 10px; margin-right: 6px; background-repeat: no-repeat; } </style> </head> <body> <div id="pageAll"> <label style="color:red">导出数据说明：不支持wps类excel，文件后缀.xls,文件名不能包含汉字；</label><br> <label style="color:red">excel中数据格式如下，列名严格按照图片格式书写，列顺序不可变；（只支持excel）</label> <div style="80%;height:100px;background-image:url('../img/1512521006(1).jpg');display:block;background-repeat: no-repeat;" > </div> <form action="${pageContext.request.contextPath}/UploadUsingExcelServlet" method="post" enctype="multipart/form-data" id="dataForm"> 上传excel<input type="file" name="file1" id="fileInput"> <input type="submit" value="提交" id="submit"> </form> <div class="page"> <div class="conShow" id="pro"> </div> <div class="conShow" id="res"> <span>错误信息:</span><br> </div> </div> </div> </body> <script type="text/javascript"> $(function () { var form = document.getElementById("dataForm"); var progress = document.getElementById("pro"); $("#submit").click(function(event) { //阻止默认事件 event.preventDefault(); //循环查看状态 var t = setInterval(function(){ $.ajax({ url: '${pageContext.request.contextPath}/ProgressServlet', type: 'POST', dataType: 'text', data: { filename: fileInput.files[0].name, }, success: function (responseText) { var data = JSON.parse(responseText); //前台更新进度 var jindu="<span class="loading"></span> 传输进度："+data.size+"/"+data.progress; $("#pro").html(jindu); // progress.innerText ="传输进度 :"+data.size+"/"+data.progress; // alert( data.size+"/"+data.progress); var tag=""; if(data.errors!=""){ tag="<span style="color:red">"+data.errors+"</span><br>"; $("#res").append(tag); } }, error: function(){ console.log("error"); } }); }, 100); //上传文件 $.ajax({ url: '${pageContext.request.contextPath}/UploadUsingExcelServlet', type: 'POST', dataType: 'text', data: new FormData(form), processData: false, contentType: false, success: function (responseText) { //上传完成，清除循环事件 clearInterval(t); //将进度更新至100% progress.innerText = "完成！"; }, error: function(){ console.log("error"); } }); return false; }); })(); </script> </html>
查询进度的servlet
package com.rfx.servlet; import java.io.IOException; import javax.servlet.ServletException; import javax.servlet.annotation.WebServlet; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; import com.alibaba.fastjson.JSONObject; import com.rfx.util.ProgressSingleton; /** * <p>实时显示进度</p> * Servlet implementation class ProgressServlet */ @WebServlet("/ProgressServlet") public class ProgressServlet extends HttpServlet { private static final long serialVersionUID = 1L; private final Log log = LogFactory.getLog(getClass()); /** * @see HttpServlet#HttpServlet() */ public ProgressServlet() { super(); // TODO Auto-generated constructor stub } /** * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response) */ protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { this.doPost(request, response); } /** * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response) */ protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { log.info("进度反馈"); Object size = ProgressSingleton.get("Size"); Object progress = ProgressSingleton.get("Progress"); Object errorstr = ProgressSingleton.get("errors"); errorstr = errorstr == null ? "" : errorstr; JSONObject json = new JSONObject(); json.put("size", size); json.put("progress", progress); json.put("errors", errorstr); ProgressSingleton.remove("errors");//在保证存储的信息是实时错误状态，所以，查询一次，清除一次，只存实时处理结果 response.getWriter().print(json.toString()); } }
后台处理中，向单例存储数据。
//错误信息处理，遇到错误信息存储起来 ProgressSingleton.put("errors",map.get("product_num")+" >> "+string2);
//保存数据提条数和当前处理条数 ProgressSingleton.put("Size",list.size()); int count=0; if ("zb".equals(type)) { for (Map<String, String> map : list) { count++; ProgressSingleton.put("Progress",count); JSONObject jsonObject2 = mjService.addShiYongJiLu(map); jsonArray.add(jsonObject2); } //在处理完成的servlet中，清空单例 ProgressSingleton.remove("Size"); ProgressSingleton.remove("Progress"); ProgressSingleton.remove("errors");