文件的上传实例

 

文件的上传实例:

JSP页面:<%@ 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>上传页面</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>

    <form action="${pageContext.request.contextPath}/uploadServlet2" method="post" enctype="multipart/form-data" >

        上传用户:<input type="text" name="user"><br>

             上传文件1:<input type="file" name="file1"><br>

            上传文件2:<input type="file" name="file2"><br>

           <input type="submit" value="上传开始">

</form>

<h2>${message}</h2>

  </body>

</html>

描述文件:

<?xml version="1.0" encoding="UTF-8"?>

<web-app version="2.5"

    xmlns="http://java.sun.com/xml/ns/javaee"

    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee

    http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">

  <display-name></display-name>

  <servlet>

    <description>This is the description of my J2EE component</description>

    <display-name>This is the display name of my J2EE component</display-name>

    <servlet-name>UploadServlet</servlet-name>

    <servlet-class>com.hbsi.servlet.UploadServlet</servlet-class>

  </servlet>

  <servlet-mapping>

    <servlet-name>UploadServlet</servlet-name>

    <url-pattern>/uploadServlet</url-pattern>

  </servlet-mapping>

  <welcome-file-list>

    <welcome-file>index.jsp</welcome-file>

  </welcome-file-list>

</web-app>

selvelt:

package com.hbsi.servlet;

 

import java.io.FileOutputStream;

import java.io.IOException;

import java.io.InputStream;

import java.util.List;

 

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

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;

 

 

public class UploadServlet extends HttpServlet {

      

       private static final long serialVersionUID = 1L;

 

       public void doGet(HttpServletRequest request, HttpServletResponse response)

                     throws ServletException, IOException {

 

              doPost(request, response);

       }

 

       public void doPost(HttpServletRequest request, HttpServletResponse response)

                     throws ServletException, IOException {                //上传文件

              try {

                     //(1)创建一个工厂对象FileItem

                     DiskFileItemFactory factory=new DiskFileItemFactory();

                     //(2)得到解析器

                     ServletFileUpload upload=new ServletFileUpload(factory);

                     upload.setHeaderEncoding("utf-8");

                     //(3)对请求进行解析,有几个输入项,就有几个FileItem对象

                     List<FileItem> list= upload.parseRequest(request);

                    

                     //(4)迭代list集合,获取list集合中的每一项

                     for(FileItem item:list){

                            //判断输入的类型

                            if(item.isFormField()){

                                   //普通输入项

                                   String inputName=item.getFieldName();

                                   String inputValue=item.getString();

                                   System.out.println(inputName+" "+inputValue);

                            }else{

                                   //上传文件的输入项

                                   String fileName=item.getName();//上传文件的文件名

                                   fileName=fileName.substring(fileName.lastIndexOf("\\")+1);

                                   InputStream is=item.getInputStream();

                                  

                                   FileOutputStream fos=new FileOutputStream("D:\\"+fileName);

                                  

                                   byte[] buff=new byte[1024];

                                   int len=0;

                                   while((len=is.read(buff))>0){

                                          fos.write(buff,0,len);

                                   }

                                   is.close();

                                   fos.close();

                                  

                                   request.setAttribute("message", "上传成功");

                            }

                     }

              } catch (FileUploadException e) {

                     // TODO Auto-generated catch block

                     e.printStackTrace();

                     request.setAttribute("message","上传失败");

              }

              request.getRequestDispatcher("/upload.jsp").forward(request, response);

             

       }

 

}

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