最近的项目开发中，遇到了一个多文件上传的问题，即在不刷新页面的情况下，上传多个文件至服务器。现总结分享如下：

   本文主要采用了基于jsp的ajax，jquery，servlet等技术。

1.upload.jsp

   点击上传时，调用对应的fileupload函数，通过ajax将文件异步传送到servlet中处理。注意在文件上载时，所使用的编码类型应当是“multipart/form-data”，它既可以发送文本数据，也支持二进制数据上载。

<%@ page language="java" contentType="text/html; charset=utf-8" pageEncoding="utf-8"%><%String path = request.getContextPath();String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";%>
     Insert title here
     
  
      
                   
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2.PictureServlet.java

   通过该servlet接受jsp上传的数据流，存储到相应路径，并解析出文件名。

package com.servlet;import java.io.BufferedOutputStream;import java.io.DataOutputStream;import java.io.FileOutputStream;import java.io.IOException;import java.io.PrintWriter;import javax.servlet.ServletException;import javax.servlet.ServletInputStream;import javax.servlet.annotation.WebServlet;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import com.realty.base.action.BuildingAction;/** * Servlet implementation class PictureServlet */@WebServlet("/PictureServlet")public class PictureServlet extends HttpServlet {    private static final long serialVersionUID = 1L;                                                                                                           /**     * @see HttpServlet#HttpServlet()     */    public PictureServlet() {        super();        // TODO Auto-generated constructor stub    }    /**     * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)     */    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {        // TODO Auto-generated method stub        doPost(request,response);    }    /**     * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)     */    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {        // TODO Auto-generated method stub         response.setContentType("text/xml");//是xml            response.setHeader("Cache-Control", "no-cache");            response.setCharacterEncoding("UTF-8");            String filepath ="E:/pic/";//文件上传的路径，实际开发中一般用相对路径            String filename = "";            String name="";            ServletInputStream in = request.getInputStream();            byte[] buf = new byte[4048];            int len = in.readLine(buf, 0, buf.length);            String f = new String(buf, 0, len - 1);            while ((len = in.readLine(buf, 0, buf.length)) != -1) {                filename = new String(buf, 0, len,"utf-8");//解决汉字乱码问题                int j = filename.lastIndexOf("\"");                int s = filename.indexOf("filename");                name=filename.substring(s+10,j);                filename = name;//通过上述处理可以得到上传的文件名                System.out.println("filename="+filename);                                                                                                                                   DataOutputStream fileStream = new DataOutputStream(new BufferedOutputStream(new FileOutputStream(filepath+ filename)));                len = in.readLine(buf, 0, buf.length);                len = in.readLine(buf, 0, buf.length);                while ((len = in.readLine(buf, 0, buf.length)) != -1) {                    String tempf = new String(buf, 0, len - 1);                    if (tempf.equals(f) || tempf.equals(f + "--")) {                        break;                    }                    else{                         fileStream.write(buf, 0, len); // 写入                    }                }                fileStream.close();            }            PrintWriter out=response.getWriter();            String result = filename ;            out.print(result);            out.close();            in.close();                                                  }}

   注意相关jar包的引入，见附件。