这个提示怎么避免？

[Gemerl]

我做的是excel导出。。
我用的是先保存要导出的数据到服务器的指定位置。 然后直接访问路径下载下来。。
问题是有提示下载但是点击下载并没有下载。。而是重新点击导出才会真正的下载。。下有截图
图片总是传不上来。。 看这个图片地址吧。。http://chuantu.biz/t/15/1408588112x-954497572.jpg
下面是我的源码 纯jsp。。

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ page language="java" import="org.apache.poi.*"%>
<%@page import="java.io.*"%>
<%@page import="org.apache.poi.hssf.usermodel.HSSFWorkbook"%>
<%@page import="org.apache.poi.hssf.usermodel.HSSFSheet"%>
<%@page import="org.apache.poi.hssf.usermodel.HSSFRow"%>
<%@page import="org.apache.poi.hssf.usermodel.HSSFCell"%>
<%@page import="org.apache.poi.hssf.usermodel.HSSFCellStyle"%>
<%@page import="org.apache.poi.hssf.util.HSSFColor"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jstl/core_rt" %>

<%
	String path = request.getContextPath();
	String basePath = request.getScheme() + "://"
			+ request.getServerName() + ":" + request.getServerPort()
			+ path + "/";
%>
<%!class User {
		private int id;
		private String name;
		private String address;

		public int getId() {
			return id;
		}

		public String getName() {
			return name;
		}

		public String getAddress() {
			return address;
		}

		public void setId(int id) {
			this.id = id;
		}

		public void setName(String name) {
			this.name = name;
		}

		public void setAddress(String address) {
			this.address = address;
		}
	}

	public List<User> getAllUser() {
		List<User> users = new ArrayList<User>();
		User u1 = new User();
		u1.id = 1;
		u1.name = "张三";
		u1.address = "北京";

		User u2 = new User();
		u2.id = 2;
		u2.name = "李四";
		u2.address = "武汉";

		User u3 = new User();
		u3.id = 3;
		u3.name = "王五";
		u3.address = "上海";
		users.add(u1);
		users.add(u2);
		users.add(u3);
		return users;
	}

	public User getUserById(List<User> users, int id) {
		for (int i = 0; i < users.size(); i++) {
			if (users.get(i).id == id) {
				return users.get(i);
			}
		}
		return null;
	}

	public void download(File file, HttpServletResponse response) {
		try {
			// path是指欲下载的文件的路径。   
			//File file = new File(path);
			// 取得文件名。   
			String filename = file.getName();
			// 以流的形式下载文件。   
			InputStream fis = new BufferedInputStream(new FileInputStream(file));
			byte[] buffer = new byte[fis.available()];
			fis.read(buffer);
			// 清空response   
			response.reset();
			// 设置response的Header   
			response.addHeader("Content-Disposition", "attachment;filename="
					+ new String(filename.getBytes()));
			response.addHeader("Content-Length", "" + file.length());
			OutputStream toClient = new BufferedOutputStream(response
					.getOutputStream());
			response.setContentType("application/vnd.ms-excel;charset=gb2312");
			toClient.write(buffer);
			toClient.flush();
			fis.close();
			toClient.close();
		} catch (IOException ex) {
			ex.printStackTrace();
		}
	}%>
<%
	List<User> uus = getAllUser();
	List<User> users = new ArrayList<User>();
	String method = request.getParameter("method");
	if (method != null && method.equals("export")) {//导出
		String date_ = request.getParameter("strData");
		String path_ = session.getServletContext().getRealPath("/temp/export.xls");
		File file = new File(path_);
		if (null != date_ && !"".equals(date_)) {
			String ids[] = date_.split(",");
			for (int i = 0; i < ids.length; i++) {
				User u = getUserById(uus, Integer.valueOf(ids[i]));
				users.add(u);
			}
			if (users.size() > 0) {
				HSSFWorkbook book = new HSSFWorkbook();
				HSSFSheet sheet = book.createSheet("新手记录");
				HSSFCellStyle style = book.createCellStyle();
				style.setBorderBottom(HSSFCellStyle.ALIGN_CENTER);
				style.setBorderLeft(HSSFCellStyle.ALIGN_CENTER);
				style.setBorderRight(HSSFCellStyle.ALIGN_CENTER);
				style.setBorderTop(HSSFCellStyle.ALIGN_CENTER);
				style.setFillForegroundColor(HSSFColor.DARK_YELLOW.index);
				style.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND);

				HSSFCellStyle style2 = book.createCellStyle();
				style2.setBorderBottom(HSSFCellStyle.ALIGN_CENTER);
				style2.setBorderLeft(HSSFCellStyle.ALIGN_CENTER);
				style2.setBorderRight(HSSFCellStyle.ALIGN_CENTER);
				style2.setBorderTop(HSSFCellStyle.ALIGN_CENTER);

				HSSFRow titleRow = sheet.createRow(0);
				HSSFCell noTitle = titleRow.createCell(0,HSSFCell.CELL_TYPE_STRING);
				HSSFCell nameTitle = titleRow.createCell(1,HSSFCell.CELL_TYPE_STRING);
				HSSFCell addressTitle = titleRow.createCell(2,HSSFCell.CELL_TYPE_STRING);
				noTitle.setCellValue("编号");
				nameTitle.setCellValue("姓名");
				addressTitle.setCellValue("地址");
				noTitle.setCellStyle(style);
				nameTitle.setCellStyle(style);
				addressTitle.setCellStyle(style);
				
				
				for (int i = 0; i < users.size(); i++) {
					HSSFRow contentRow = sheet.createRow(i + 1);
					User uu = users.get(i);
					HSSFCell contentCell_1 = contentRow.createCell(0,
							HSSFCell.CELL_TYPE_NUMERIC);
					HSSFCell contentCell_2 = contentRow.createCell(1,
							HSSFCell.CELL_TYPE_STRING);
					HSSFCell contentCell_3 = contentRow.createCell(2,
							HSSFCell.CELL_TYPE_STRING);
					contentCell_1.setCellValue(uu.getId());
					contentCell_2.setCellValue(uu.getName());
					contentCell_3.setCellValue(uu.getAddress());
					contentCell_1.setCellStyle(style2);
					contentCell_2.setCellStyle(style2);
					contentCell_3.setCellStyle(style2);
				}
				FileOutputStream os = new FileOutputStream(file);
				book.write(os);
				os.close();
			}
		}
		String downPath=basePath+"temp/"+file.getName();
		//System.out.print(downPath);
		PrintWriter pw = response.getWriter();
		pw.write("{'mes':'ok','downPath':'"+downPath+"'}");
		return;
		
		//response.sendRedirect(basePath+"temp/"+file.getName());
		//out.print("<script>document.location.href='"+basePath+"temp/"+file.getName()+"';</script>");
		//download(file, response); 
		//System.out.print(file.getName());
		//out.clear();
		//out = pageContext.pushBody();
		
	}
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <base href="<%=basePath%>">
    
    <title>excel导出测试</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">
	-->
	<style type="text/css">
	table{background-color:blue;}
	td{background-color:white;}
	</style>
	<script type="text/javascript" src="<%=basePath%>js/jquery.js"></script>
	<script type="text/javascript">
		$(function(){
			$("#box_").click(function(){
				if($(this).attr("checked")==true){
					$("input[name='box']").attr("checked",true);
				}else{
					$("input[name='box']").attr("checked",false);

				}
			});
			$("#box_1").click(function(){
				if($(this).attr("checked")==true){
					$("input[name='box']").each(function(){
						if($(this).attr("checked")==true){
							$(this).attr("checked",false);
						}else{
							$(this).attr("checked",true);
						}
					});
				}
			});
		});

		function in_(){
			document.location.href='<%=basePath%>index2.jsp';
		}
		function out(){
			var boxs=$("input[name='box'][checked]");
			var arr=new Array();
			var strData="";
			$(boxs).each(function(){
				var parent=$(this).parent().parent().children('td');
				var id=$(parent).eq(1).text();
				arr.push(id);
			});
			if(arr.length>0){//有选中的条目
				strData=arr.join();
				$.ajax({
					type:"post",
					url:"<%=basePath%>index.jsp",
					data:{"strData":strData,"method":"export"},
					success:function(data){
						var message=eval("("+data+")");
						if(message.mes=='ok'){
							alert(message.mes);
							document.location.href=message.downPath;
						}
					}
				});
			}
		}
	</script>
  </head>
  
  <body>
  	<button onclick="out()">导出选中的条目</button><button onclick="in_()">导入选中的条目</button>
    <table cellpadding="1" cellspacing="1" width="800" bordercolor="#0000FF" on>
    	<tr><td><input type="checkbox" id="box_"/>全选/全不选  <input type="checkbox" id="box_1"/>反选</td><td>编号</td><td>姓名</td><td>地址</td></tr>
    	<%
    		for (int i = 0; i < uus.size(); i++) {
    	%>
    		<tr><td><input type="checkbox" name="box"/></td><td><%=uus.get(i).id%></td><td><%=uus.get(i).name%></td><td><%=uus.get(i).address%></td></tr>
   		<%
   			}
   		%>
    </table>
  </body>
</html>

[Gemerl]

另外发现个问题 我这些js好像在火狐 out（）这个方法中都没作用。。 这段好像不起作用

$(boxs).each(function(){                 var parent=$(this).parent().parent().children('td');                 var id=$(parent).eq(1).text();                 arr.push(id);             }); 

[Gemerl]

找到在火狐下不下载的原因。。 var boxs=$("input[name='box'][checked]"); 这种语法在ie中支持 火狐不支持。。 $("input[name='box']:checked");这种就支持火狐和ie

[shixitong]

把IE的安全级别调低，或者关掉 http://blog.sina.com.cn/s/blog_53873d95010184j6.html