文件名称:Apache Commons fileUpload实现文件上传
文件大小:10KB
文件格式:TXT
更新时间:2015-10-15 08:34:04
Commons fileUpload 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:
<input type="text" name="name" size="15"><br> File:
<input type="file" name="myfile"><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.*"%> <% 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
"); } else {//如果是上传文件,显示文件名。 out.print("the upload file name is" + item.getName()); out.print("
"); } } } 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:
<input type="file" name="myfile"><br> File2:
<input type="file" name="myfile"><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.*"%> <%String uploadPath="D:\\\\temp"; boolean isMultipart = ServletFileUpload.isMultipartContent(request); if(isMultipart==true){ try{ FileItemFactory factory = new DiskFileItemFactory(); ServletFileUpload upload = new ServletFileUpload(factory); List
<input type="file" name="myfile"><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.*"%> <% 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
<input type="file" name="myfile"><br>
<input type="submit" name="submit" value="Commit"> </form> </body> </html> web.xml