public class ImageServlet extends HttpServlet {

    
    
    /**
     * The doGet method of the servlet. <br>
     *
     * This method is called when a form has its tag value method equals to get.
     * 
     * @param request the request send by the client to the server
     * @param response the response send by the server to the client
     * @throws ServletException if an error occurred
     * @throws IOException if an error occurred
     */
    public void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {

        this.doPost(request, response);
    }

    /**
     * The doPost method of the servlet. <br>
     *
     * This method is called when a form has its tag value method equals to post.
     * 
     * @param request the request send by the client to the server
     * @param response the response send by the server to the client
     * @throws ServletException if an error occurred
     * @throws IOException if an error occurred
     */
    public void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {

        response.setContentType("text/html");
        response.setCharacterEncoding("utf-8");
        MultipartRequest mr = null;
        int maxPostSize = 1*100*1024*1024;
        String dir = getServletConfig().getServletContext().getRealPath("/uploadImage");
        mr = new MultipartRequest(request,dir,maxPostSize,"utf-8");
        Enumeration files = mr.getFileNames();
        String fileName ="";
        String path = "";
        while(files.hasMoreElements()){
            
            fileName = files.nextElement().toString();
            path = mr.getFilesystemName(fileName);
            File f = mr.getFile(fileName);
            
            if(f==null){
                throw new ServletException("file is null");
            }

            Date dt = new Date(System  
                    .currentTimeMillis());  
            SimpleDateFormat fmt = new SimpleDateFormat(  
            "yyyyMMddHHmmssSSS");  
            String time = fmt.format(dt); 
            String newName = time+f.getName().substring(path.lastIndexOf('.'));
            File newFile = new File(dir+"/"+newName);
            f.renameTo(newFile);
            System.out.println("newName:"+newName);
            System.out.println("filename:"+newFile.getName());
            System.out.println("path:"+newFile.getPath());
        }
        PrintWriter out = response.getWriter();
        out.print("上传成功！");
    }

}