package com.pdw.servlet;
import java.io.*;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.commons.fileupload.*;
import java.util.regex.*;
import java.util.*;
public class FileUpServlet extends HttpServlet {
private static final String CONTENT_TYPE="text/html;charset=utf-8";
/**
* Constructor of the object.
*/
public FileUpServlet() {
super();
}
/**
* Destruction of the servlet. <br>
*/
public void destroy() {
super.destroy(); // Just puts "destroy" string in log
// Put your code here
}
/**
* 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
* @throws FileUploadException
*/
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType(CONTENT_TYPE);
PrintWriter out=response.getWriter();
DiskFileUpload dfu=new DiskFileUpload();
dfu.setSizeMax(2*1024*1024);
dfu.setSizeThreshold(4096);//最多允许在内存中存放4096个字节
dfu.setRepositoryPath("c:/temp"); //当内存中存放的字据超过setSizeThreshold()所设定的值时,
//文件存放到硬盘目录
try{
List fileitems=dfu.parseRequest(request);
Iterator it=fileitems.iterator();
String regExp=".+\\\\(.+)$"; //正则匹配,去掉路径取文件名.
String errortype[]={".exe",".com",".cgi",".asp"};
Pattern p=Pattern.compile(regExp);
while(it.hasNext()){
FileItem fileitem=(FileItem)it.next();
// 忽略不是文件域的元素.
if(!fileitem.isFormField()){
String name=fileitem.getName();
long size=fileitem.getSize();
if("".equals(name)||size==0){
continue;
}
System.out.println(name);
Matcher m=p.matcher(name);
boolean result=m.find();
if(result){
for(int i=0;i<errortype.length;i++){
if(m.group(1).endsWith(errortype[i])){
throw new IOException(name+" wrong type");
}
}
System.out.println("---------------------------A");
try{
fileitem.write(new File("C:/upload/"+m.group(1)));
out.println(name+"--->"+size);
}catch(Exception e){
out.print(e);
}
System.out.println("----------------B");
}else{
throw new IOException("文件上传失败");
}
}
}
}catch(Exception e){
System.out.println(e.toString());
}
}
/**
* 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
* @throws FileUploadException
*/
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doGet(request,response);
}
/**
* Initialization of the servlet. <br>
*
* @throws ServletException if an error occure
*/
public void init() throws ServletException {
// Put your code here
}
}
====================================================
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<title>My JSP ‘fileup.jsp‘ starting page</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">
-->
</head>
<body>
<center>文件上传例子</center>
<FORM action="servlet/FileUpServlet" method="post" enctype="multipart/form-data">
<table border="1" width="450" cellpadding="4" cellspacing="2" bordercolor="#9BD7FF">
<tr><td width="100%" colspan="2">
文件1：<input name="x" size="40" type="file">
</td></tr>
<tr><td width="100%" colspan="2">
文件2：<input name="y" size="40" type="file">
</td></tr>
<tr><td width="100%" colspan="2">
文件3：<input name="z" size="40" type="file">
</td></tr>
</table>
<br/><br/>
<table>
<tr><td align="center"><input name="upload" type="submit" value="开始上传"/></td></tr>
</table>
</FORM>
</body>
</html>
