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用jsp、Servlet实现上传文件

2012-11-19 21:44 507 查看

最近项目中遇到需要导入excel文件并将文件中数据保存到数据库的问题，于是特意练习了一下文件的上传。

一、页面upload.jsp文件

<body>

<h2>导入标准xml关系模式</h2>

<form name="upform" action="UploadServlet" method="POST" enctype="multipart/form-data">

     <input type ="file" name="file1" id="file1"/><br/>

         <input type ="file" name="file2" id="file2"/><br/>

           <input type ="file" name="file3" id="file3"/><br/>

              <input type="submit" value="Submit" /><br/>

               <input type="reset" />

      </form>

</body>

二、servlet文件UploadServlet.java

import java.io.BufferedInputStream;

import java.io.BufferedOutputStream;

import java.io.File;

import java.io.FileOutputStream;

import java.io.IOException;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import org.apache.commons.fileupload.DefaultFileItemFactory;

import org.apache.commons.fileupload.FileItemFactory;

import org.apache.commons.fileupload.FileItemIterator;

import org.apache.commons.fileupload.FileItemStream;

import org.apache.commons.fileupload.disk.DiskFileItemFactory;

import org.apache.commons.fileupload.servlet.ServletFileUpload;

import org.apache.commons.fileupload.util.Streams;

public class UploadServlet extends javax.servlet.http.HttpServlet implements javax.servlet.Servlet {

File tmpDir = null;//初始化上传文件的临时存放目录

File saveDir = null;//初始化上传文件后的保存目录

public UploadServlet() {      super();    }

protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

   doPost(request,response);

   }

public void init() throws ServletException {

   super.init();

   String tmpPath = "c:\\tmpdir";

   String savePath = "c:\\updir";

   tmpDir = new File(tmpPath);

   saveDir = new File(savePath);

   if(!tmpDir.isDirectory())

    tmpDir.mkdir();

   if(!saveDir.isDirectory())

    saveDir.mkdir();

   }

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

   try{

        if(ServletFileUpload.isMultipartContent(request)){

     DiskFileItemFactory dff = new DiskFileItemFactory();//创建该对象

     dff.setRepository(tmpDir);//指定上传文件的临时目录

     dff.setSizeThreshold(1024000);//指定在内存中缓存数据大小,单位为byte

     ServletFileUpload sfu = new ServletFileUpload(dff);//创建该对象

     sfu.setFileSizeMax(5000000);//指定单个上传文件的最大尺寸

     sfu.setSizeMax(10000000);//指定一次上传多个文件的总尺寸

     FileItemIterator fii = sfu.getItemIterator(request);

     while(fii.hasNext()){



      FileItemStream fis = fii.next();//从集合中获得一个文件流

      if(!fis.isFormField() && fis.getName().length()>0){

       System.out.println("fff");

       String fileName = fis.getName().substring(fis.getName().lastIndexOf(\\)+1);//获得上传文件的文件名

       System.out.println(fileName);

       BufferedInputStream in = new BufferedInputStream(fis.openStream());//获得文件输入流

       BufferedOutputStream out = new BufferedOutputStream(new FileOutputStream(new File(saveDir+"\"+filename)));//获得文件输出流

       Streams.copy(in, out, true);//开始把文件写到你指定的上传文件夹

      }

     }

     response.getWriter().println("File upload successfully!!!");

    }

   }

   catch(Exception e){

    e.printStackTrace();

   }

}

}

三、web.xml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">

<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>UploadServlet</servlet-class>

</servlet>

<servlet-mapping>

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

    <url-pattern>/UploadServlet</url-pattern>

</servlet-mapping>

<servlet-mapping>

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

    <url-pattern>/UploadServlet</url-pattern>

</servlet-mapping>

<welcome-file-list>

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

</welcome-file-list>

</web-app>

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