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Apache Commons fileUpload实现文件上传

    博客分类：
  • java
 
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Apache Commons fileUpload实现文件上传

 

2007-02-24 10:38:16

 

标签：文件上传 Commons Apache 休闲 fileUpload

 

原创作品，允许转载，转载时请务必以超链接形式标明文章 原始出处 、作者信息和本声明。否则将追究法律责任。http://zhangjunhd.blog.51cto.com/113473/18331

 

Apache的commons-fileupload.jar可方便的实现文件的上传功能，本文通过实例来介绍如何使用commons-fileupload.jar。

 

@author:ZJ 07-2-22

 

Blog: [url]http://zhangjunhd.blog.51cto.com/[/url]

 

    将Apache的commons-fileupload.jar放在应用程序的WEB-INF\lib下，即可使用。下面举例介绍如何使用它的文件上传功能。

 

所使用的fileUpload版本为1.2，环境为Eclipse3.3+MyEclipse6.0。FileUpload 是基于 Commons IO的，所以在进入项目前先确定Commons IO的jar包（本文使用commons-io-1.3.2.jar）在WEB-INF\lib下。

 

此文作示例工程可在文章最后的附件中下载。

 

示例1

 

最简单的例子，通过ServletFileUpload静态类来解析Request，工厂类FileItemFactory会对mulipart类的表单中的所有字段进行处理，不只是file字段。getName（）得到文件名，getString（）得到表单数据内容，isFormField（）可判断是否为普通的表单项。

 

demo1.html

 

<html>

<head>

    <meta http-equiv="Content-Type" content="text/html; charset=GB18030">

    <title>File upload</title>

</head>

<body>

       //必须是multipart的表单数据。

    <form name="myform" action="demo1.jsp" method="post"

       enctype="multipart/form-data">

       Your name: <br>

       <input type="text" name="name" size="15"><br>

       File:<br>

       <input type="file" name="myfile"><br>

       <br>

       <input type="submit" name="submit" value="Commit">

    </form>

</body>

</html>

 

 

 

demo1.jsp

 

<%@ page language="java" contentType="text/html; charset=GB18030"

    pageEncoding="GB18030"%>

<%@ page import="org.apache.commons.fileupload.*"%>

<%@ page import="org.apache.commons.fileupload.servlet.*"%>

<%@ page import="org.apache.commons.fileupload.disk.*"%>

<%@ page import="java.util.*"%>

 

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<%

    boolean isMultipart = ServletFileUpload.isMultipartContent(request);//检查输入请求是否为multipart表单数据。

    if (isMultipart == true) {

       FileItemFactory factory = new DiskFileItemFactory();//为该请求创建一个DiskFileItemFactory对象，通过它来解析请求。执行解析后，所有的表单项目都保存在一个List中。

       ServletFileUpload upload = new ServletFileUpload(factory);

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

       Iterator<FileItem> itr = items.iterator();

       while (itr.hasNext()) {

           FileItem item = (FileItem) itr.next();

           //检查当前项目是普通表单项目还是上传文件。

           if (item.isFormField()) {//如果是普通表单项目，显示表单内容。

       String fieldName = item.getFieldName();

       if (fieldName.equals("name")) //对应demo1.html中type="text" name="name"

           out.print("the field name is" + item.getString());//显示表单内容。

       out.print("<br>");

           } else {//如果是上传文件，显示文件名。

       out.print("the upload file name is" + item.getName());

       out.print("<br>");

           }

       }

    } else {

       out.print("the enctype must be multipart/form-data");

    }

%>

<html>

<head>

    <meta http-equiv="Content-Type" content="text/html; charset=GB18030">

    <title>File upload</title>

</head>

<body>

</body>

</html>

 

结果：

 

the field name isjeff
the upload file name isD:\C语言考试样题\作业题.rar

 

示例2

 

上传两个文件到指定的目录。

 

demo2.html

 

<html>

<head>

    <meta http-equiv="Content-Type" content="text/html; charset=GB18030">

    <title>File upload</title>

</head>

<body>

    <form name="myform" action="demo2.jsp" method="post"

       enctype="multipart/form-data">

       File1:<br>

       <input type="file" name="myfile"><br>

       File2:<br>

       <input type="file" name="myfile"><br>

       <br>

       <input type="submit" name="submit" value="Commit">

    </form>

</body>

</html>

 

 

 

demo2.jsp

 

<%@ page language="java" contentType="text/html; charset=GB18030"

    pageEncoding="GB18030"%>

<%@ page import="org.apache.commons.fileupload.*"%>

<%@ page import="org.apache.commons.fileupload.servlet.*"%>

<%@ page import="org.apache.commons.fileupload.disk.*"%>

<%@ page import="java.util.*"%>

<%@ page import="java.io.*"%>

 

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<%String uploadPath="D:\\temp";

  boolean isMultipart = ServletFileUpload.isMultipartContent(request);

  if(isMultipart==true){

      try{

        FileItemFactory factory = new DiskFileItemFactory();

        ServletFileUpload upload = new ServletFileUpload(factory);

        List<FileItem> items = upload.parseRequest(request);//得到所有的文件

       Iterator<FileItem> itr = items.iterator();

        while(itr.hasNext()){//依次处理每个文件

         FileItem item=(FileItem)itr.next();

         String fileName=item.getName();//获得文件名，包括路径

         if(fileName!=null){

             File fullFile=new File(item.getName());

             File savedFile=new File(uploadPath,fullFile.getName());

             item.write(savedFile);

         }

        }

        out.print("upload succeed");

      }

      catch(Exception e){

         e.printStackTrace();

      }

  }

  else{

      out.println("the enctype must be multipart/form-data");

  }

%>

<html>

<head>

<meta http-equiv="Content-Type" content="text/html; charset=GB18030">

<title>File upload</title>

</head>

<body>

</body>

</html>

 

结果：

 

upload succeed

 

此时，在"D:\temp"下可以看到你上传的两个文件。

 

示例3

 

上传一个文件到指定的目录，并限定文件大小。

 

demo3.html

 

<html>

<head>

    <meta http-equiv="Content-Type" content="text/html; charset=GB18030">

    <title>File upload</title>

</head>

<body>

    <form name="myform" action="demo3.jsp" method="post"

       enctype="multipart/form-data">

       File:<br>

       <input type="file" name="myfile"><br>

       <br>

       <input type="submit" name="submit" value="Commit">

    </form>

</body>

</html>

 

 

 

demo3.jsp

 

<%@ page language="java" contentType="text/html; charset=GB18030"

    pageEncoding="GB18030"%>

<%@ page import="org.apache.commons.fileupload.*"%>

<%@ page import="org.apache.commons.fileupload.servlet.*"%>

<%@ page import="org.apache.commons.fileupload.disk.*"%>

<%@ page import="java.util.*"%>

<%@ page import="java.io.*"%>

 

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<%

    File uploadPath = new File("D:\\temp");//上传文件目录

    if (!uploadPath.exists()) {

       uploadPath.mkdirs();

    }

    // 临时文件目录

    File tempPathFile = new File("d:\\temp\\buffer\\");

    if (!tempPathFile.exists()) {

       tempPathFile.mkdirs();

    }

    try {

       // Create a factory for disk-based file items

       DiskFileItemFactory factory = new DiskFileItemFactory();

 

       // Set factory constraints

       factory.setSizeThreshold(4096); // 设置缓冲区大小，这里是4kb

       factory.setRepository(tempPathFile);//设置缓冲区目录

 

       // Create a new file upload handler

       ServletFileUpload upload = new ServletFileUpload(factory);

 

       // Set overall request size constraint

       upload.setSizeMax(4194304); // 设置最大文件尺寸，这里是4MB

 

       List<FileItem> items = upload.parseRequest(request);//得到所有的文件

       Iterator<FileItem> i = items.iterator();

       while (i.hasNext()) {

           FileItem fi = (FileItem) i.next();

           String fileName = fi.getName();

           if (fileName != null) {

       File fullFile = new File(fi.getName());

       File savedFile = new File(uploadPath, fullFile

              .getName());

       fi.write(savedFile);

           }

       }

       out.print("upload succeed");

    } catch (Exception e) {

       e.printStackTrace();

    }

%>

<html>

<head>

<meta http-equiv="Content-Type" content="text/html; charset=GB18030">

<title>File upload</title>

</head>

<body>

</body>

</html>

 

示例4

 

利用Servlet来实现文件上传。

 

Upload.java

 

package com.zj.sample;

 

import java.io.File;

import java.io.IOException;

import java.util.Iterator;

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.disk.DiskFileItemFactory;

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

 

@SuppressWarnings("serial")

publicclass Upload extends HttpServlet {

    private String uploadPath = "D:\\temp"; // 上传文件的目录

    private String tempPath = "d:\\temp\\buffer\\"; // 临时文件目录

    File tempPathFile;

 

    @SuppressWarnings("unchecked")

    publicvoid doPost(HttpServletRequest request, HttpServletResponse response)

           throws IOException, ServletException {

       try {

           // Create a factory for disk-based file items

           DiskFileItemFactory factory = new DiskFileItemFactory();

 

           // Set factory constraints

           factory.setSizeThreshold(4096); // 设置缓冲区大小，这里是4kb

           factory.setRepository(tempPathFile);// 设置缓冲区目录

 

           // Create a new file upload handler

           ServletFileUpload upload = new ServletFileUpload(factory);

 

           // Set overall request size constraint

           upload.setSizeMax(4194304); // 设置最大文件尺寸，这里是4MB

 

           List<FileItem> items = upload.parseRequest(request);// 得到所有的文件

           Iterator<FileItem> i = items.iterator();

           while (i.hasNext()) {

              FileItem fi = (FileItem) i.next();

              String fileName = fi.getName();

              if (fileName != null) {

                  File fullFile = new File(fi.getName());

                  File savedFile = new File(uploadPath, fullFile.getName());

                  fi.write(savedFile);

              }

           }

           System.out.print("upload succeed");

       } catch (Exception e) {

           // 可以跳转出错页面

           e.printStackTrace();

       }

    }

 

    publicvoid init() throws ServletException {

       File uploadFile = new File(uploadPath);

       if (!uploadFile.exists()) {

           uploadFile.mkdirs();

       }

       File tempPathFile = new File(tempPath);

        if (!tempPathFile.exists()) {

           tempPathFile.mkdirs();

       }

    }

}

 

 

 

demo4.html

 

<html>

<head>

    <meta http-equiv="Content-Type" content="text/html; charset=GB18030">

    <title>File upload</title>

</head>

<body>

// action="fileupload"对应web.xml中<servlet-mapping>中<url-pattern>的设置.

    <form name="myform" action="fileupload" method="post"

       enctype="multipart/form-data">

       File:<br>

       <input type="file" name="myfile"><br>

       <br>

       <input type="submit" name="submit" value="Commit">

    </form>

</body>

</html>

 

 

 

web.xml

 

<servlet>

    <servlet-name>Upload</servlet-name>

    <servlet-class>com.zj.sample.Upload</servlet-class>

</servlet>

 

<servlet-mapping>

    <servlet-name>Upload</servlet-name>

    <url-pattern>/fileupload</url-pattern>

</servlet-mapping>

 

本文出自 “子孑” 博客，请务必保留此出处http://zhangjunhd.blog.51cto.com/113473/18331

 

 

 

 

 

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