function upload(id){

		 var winObj = window.open ("/portal/trip/toUpload?id="+id, "newwindow", "height=700, width=800, toolbar =no, menubar=no, scrollbars=no, resizable=no, location=no, status=no, top=50,left=1100");

		 var loop = setInterval(function() {

		 if(winObj.closed) {

				clearInterval(loop);

				 window.location.reload();

		 }

		}, 1);

 }

@RequestMapping("/toUpload")

	public String toUpload(Long id, HttpServletRequest request){
　　　　　　　　　　request.setAttribute("id",id);

		return "/tripController/toUpload";

	}

	   <form name="fileForm" action="/portal/trip/upload" method="post" enctype="multipart/form-data">

	    	<input type="hidden" name="id" id="id" value="${id }">

	   		<font size="2" face="Arial" color="#004779">Select: </font> <input type="file" name="file"  style="color:#95a5a6; padding-left:5px;border-radius:5px;  width:500px; height:28px; vertical-align:middle;">

	   		<input type="submit" value="Upload" style="color:#2c3e50;font-size:12px; font-weight:bold; border-radius:5px; vertical-align:middle;height:30px;  width:60px; ">

	   </form>

@RequestMapping(value = "/upload", method = RequestMethod.POST)

	public String upload(@RequestParam("file") MultipartFile image, Long id,HttpServletRequest request, HttpServletResponse response) throws IllegalStateException, IOException{

		// 转型为MultipartHttpRequest

        MultipartHttpServletRequest multipartRequest = (MultipartHttpServletRequest) request;

        // 根据前台的name名称得到上传的文件

        MultipartFile file = multipartRequest.getFile("file");

        // 获得文件名：

        String realFileName = file.getOriginalFilename();

        // 获取路径

        String ctxPath = request.getSession().getServletContext().getRealPath("/").substring(0, request.getSession().getServletContext().getRealPath("/").lastIndexOf(request.getContextPath().replace("/", "")));

        File dirPath = new File(ctxPath+File.separator+"upload"+File.separator+"trip"+File.separator);

        System.out.println("路径" + dirPath);

        /*String ctxPath = request.getSession().getServletContext()

          		 .getRealPath("/download/trip/")

                   + "/" ;

        System.out.println("路径" + ctxPath);

        // 创建文件

        File dirPath = new File(ctxPath);  */

        if (!dirPath.exists()) {

            dirPath.mkdir();

        }

        else{

            System.out.println("文件夹已经存在");

        }

        File uploadFile = new File(dirPath +File.separator+ realFileName);

        FileCopyUtils.copy(file.getBytes(), uploadFile);

        request.setAttribute("files", loadFiles(request));  

        tripService.updateById(id,"filename",realFileName);

        tripService.updateById(id,"ip",request.getRemoteHost());

        request.setAttribute("ip", request.getRemoteHost());

        //List<String> a = loadFiles(request);

		return "/tripController/success";

	}

	public List<String> loadFiles(HttpServletRequest request) {

        List<String> files = new ArrayList<String>();

        String ctxPath = request.getSession().getServletContext().getRealPath("/").substring(0, request.getSession().getServletContext().getRealPath("/").lastIndexOf(request.getContextPath().replace("/", "")));

        File file = new File(ctxPath+File.separator+"upload"+File.separator+"trip"+File.separator);

        if (file.exists()) {

            File[] fs = file.listFiles();

            String fname = null;

            for (File f : fs) {

                if (f.isFile()) {

                    fname=f.getName();

                    files.add(fname);

                }

            }

        }

        return files;

    }  

	@RequestMapping("/download/{fileName:.*}")

    public void download(@PathVariable("fileName") String fileName,

            HttpServletRequest request, HttpServletResponse response)

            throws Exception {

        response.setContentType("text/html;charset=utf-8");

        java.io.BufferedInputStream bis = null;

        java.io.BufferedOutputStream bos = null;

        String ctxPath = request.getSession().getServletContext().getRealPath("/").substring(0, request.getSession().getServletContext().getRealPath("/").lastIndexOf(request.getContextPath().replace("/", "")))+File.separator+"upload"+File.separator+"trip"+File.separator;

        String downLoadPath = ctxPath + fileName;

        System.out.println(downLoadPath);

        try {

            long fileLength = new File(downLoadPath).length();

            response.setContentType("application/x-msdownload;");

            response.setHeader("Content-disposition", "attachment; filename="

            		+java.net.URLEncoder.encode(fileName, "UTF-8").replace("+","%20"));

                   // + new String(fileName.getBytes("ISO8859-1"), "utf-8"));

            response.setHeader("Content-Length", String.valueOf(fileLength));

            bis = new BufferedInputStream(new FileInputStream(downLoadPath));

            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);

            }

        } catch (Exception e) {

            e.printStackTrace();

        } finally {

            if (bis != null)

                bis.close();

            if (bos != null)

                bos.close();

        }

    }

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>

<%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>

  <head>

  <script type="text/javascript" src="../js/jquery-1.4.2.min.js"></script>

    <title></title>

  </head>

  <body>

	    <font size="4" face="Arial" color="#004779"><strong>Upload Success!</strong></font>

	    <hr>

	    <font size="2" face="Arial" color="#004779"><strong>File List:</strong>

	    <c:forEach var="month" items="${files}">

	        <li><a href="/portal/trip/download/${month}">${month}</a>     </li>

	    </c:forEach>

	    </font>

  		<hr><br>

<%-- 		 <a href="${pageContext.request.contextPath}/index.jsp">返回</a>  --%>

  </body>

</html>

if(data[i].filename==null)

	str+="<td align='center' bordercolor='#DEDEDE'></td>";

else

	str+="<td align='center' bordercolor='#DEDEDE'><a href='/portal/trip/download/"+data[i].filename+"' title='Business Trip Materials Download'><img src='${pageContext.request.contextPath}/FlatUI/img/link.png' width=15px height=15px/></a></td>";