servlet 实现多个文件上传

java code:

package com.commpim.performance;

import java.io.BufferedOutputStream;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.FileReader;
import java.io.IOException;
import java.io.InputStream;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Iterator;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;


import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.FileUploadException;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;

/**
 * Servlet implementation class for Servlet: UploadFile2Servlet
 *
 */
 public class UploadFilet extends javax.servlet.http.HttpServlet implements javax.servlet.Servlet {
     //用于存放上传文件的目录
        private String uploadPath="E:\\upFile\\";
        private File tempPath=new File("E:\\upFile\\temp");
        
        /**
         * 初始化Servlet，确保需要使用的目录都被建立<br>
         * @throws javax.servlet.ServletException
         */
        
        @Override
        public void init() throws ServletException{
            if(!new File(uploadPath).isDirectory())
                new File(uploadPath).mkdir();
            if(!tempPath.isDirectory())
                tempPath.mkdir();
        }
        /**
         * 销毁Servelt
         */
        public void destory(){
            super.destroy();
        }
        
       /**
        * @param request
        * @param response
        * @throws javax.servlet.ServletException
        * @throws java.io.IOException
        */
        
        protected void processRequest(HttpServletRequest request, HttpServletResponse response)
        throws ServletException, IOException {
            
            //创建一个上传项目工厂，并设置其缓存数据大小和临时文件保存位置
            DiskFileItemFactory factory=new DiskFileItemFactory();
            factory.setSizeThreshold(4096);
            factory.setRepository(tempPath);
            
            //使用项目工厂创建一个ServletFileUpload对象，用于解析文件上传请求
            //并设置可以上传的文件的最大字节数，超过会抛出异常
            ServletFileUpload upload=new ServletFileUpload(factory);
            upload.setSizeMax(1000000);
            upload.setHeaderEncoding("utf-8");
            
            List fileItems=null;
            try{
                //开始读取上传信息
                fileItems=upload.parseRequest(request);
                //依次处理每一个上传的文件
                Iterator itor=fileItems.iterator();
                //正则匹配，过滤路径取文件名
                String regExp=".+\\\\(.+)$";
                //过滤文件类型
                String[] errorType={".exe",".com",".cgi",".asp"};
                Pattern p=Pattern.compile(regExp);
                while(itor.hasNext()){
                    FileItem item=(FileItem)itor.next();
                    
                    //忽略其他不是文件域的所有其他表单信息
                    if(!item.isFormField()){
                        String name=item.getName();
                        long size=item.getSize();
                        if((name==null||name.equals(""))&&size==0)
                            continue;
                        Matcher m=p.matcher(name);
                        boolean result=m.find();
                        //如果是允许上传的文件类型就执行上传操作
                        if(result){
                            for(int temp=0;temp<errorType.length;temp++){
                                if(m.group(1).endsWith(errorType[temp])){
                                    throw new IOException(name+":wrong type");
                                }
                            }
                            try{
                                //保存文件到指定的目录，如果是保存到数据库，改写这里 
                                    item.write(new File(uploadPath,m.group(1)));
                                                                            
                            }catch(Exception e){
                            }
                        }else{
                            throw new IOException("fail to upload");
                        }
                    }
                }            
            }catch(IOException e){
                e.printStackTrace();
            }catch(FileUploadException e1){
                e1.printStackTrace();
            }
            
        } 
        // <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
        /** 
        * Handles the HTTP <code>GET</code> method.
        * @param request servlet request
        * @param response servlet response
        */
        protected void doGet(HttpServletRequest request, HttpServletResponse response)
        throws ServletException, IOException {
            processRequest(request, response);
        }

        /** 
        * Handles the HTTP <code>POST</code> method.
        * @param request servlet request
        * @param response servlet response
        */
        protected void doPost(HttpServletRequest request, HttpServletResponse response)
        throws ServletException, IOException {
            processRequest(request, response);
        }

        /** 
        * Returns a short description of the servlet.
        */
        public String getServletInfo() {
            return "cliff";
        }
        // </editor-fold>
}

html code:

<html>
<body>
<form name="fileform" method="post" action="UploadFilet"
        style="display: none; font-weight: bold;"
        enctype="multipart/form-data">
    <div align="center">
    <table width="421" border="1" bordercolor="#C5D6FC"
        id="urltable">
        <tr>
            <td width="421">
            <div align="center">Upload Files</div>
            </td>
        </tr>
        <tr>
            <td><input type="file" name="url_1" size="62" /></td>
        </tr>
        <tr>
            <td><input name="url_2" type="file" size="62" /></td>
        </tr>
    </table>
    </div>
    <p align="center"><input type="submit" name="Submit"
        value="Submit" /></p>
    </form>
</body>
</html>