环境：

tomcat5.6

commmons-fileupload-1.3.jar

commmons-io-2.4.jar

JSP

编码：UTF-8

临时文件夹：fileupload/tmp相对于网站根目录

上传文件保存位置：fileupload

Traditional API上传方式

//fileload01.htm

<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<html>
 <body>
  <form method="POST" enctype="multipart/form-data" action="traditionalapi.jsp">
  File to upload: <input type="file" name="file" size="40"><br/>
  <input type="submit" value="Press"> to upload the file!
	</form>
 </body>
</html>

//traditionalapi.jsp

<%@page contentType="text/html;charset=UTF-8" pageEncoding="UTF-8" language="java"%>
<%@page import="java.io.File"%>
<%@page import="java.util.List"%>
<%@page import="org.apache.commons.fileupload.*"%>
<%@page import="org.apache.commons.fileupload.disk.DiskFileItemFactory"%>
<%@page import="org.apache.commons.fileupload.servlet.ServletFileUpload"%>

<%
	request.setCharacterEncoding("UTF-8");
	// file less than 10kb will be store in memory, otherwise in file system.
	final int threshold = 10240;
	final File tmpDir = new File(getServletContext().getRealPath("/") + "fileupload" + File.separator + "tmp");
	final int maxRequestSize = 1024 * 1024 * 4;	// 4MB

	// Check that we have a file upload request
	if(ServletFileUpload.isMultipartContent(request))
	{
		// Create a factory for disk-based file items.
		FileItemFactory factory = new DiskFileItemFactory(threshold, tmpDir);
		
		// Create a new file upload handler
		ServletFileUpload upload = new ServletFileUpload(factory);

		// Set overall request size constraint.
		upload.setSizeMax(maxRequestSize);

		List<FileItem> items = upload.parseRequest(request);	// FileUploadException 
		for(FileItem item : items)
		{
			if(item.isFormField())	//regular form field
			{
				String name = item.getFieldName();
				String value = item.getString();
%>
				<h1><%=name%> --> <%=value%></h1>
<%
			}
			else
			{	//file upload
				String fieldName = item.getFieldName();
				String fileName = item.getName();
				File uploadedFile = new File(getServletContext().getRealPath("/") +
							"fileupload" + File.separator + fieldName + "_" + fileName);
				item.write(uploadedFile);
%>
				<h1>upload file <%=uploadedFile.getName()%> done!</h1>
<%
			}
		}
	}
%>

Streaming API上传方式

//fileupload02.htm

<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<html>
 <body>
  <form method="POST" enctype="multipart/form-data" action="streamingapi.jsp">
  File to upload: <input type="file" name="file" size="40"><br/>
  <input type="submit" value="Press"> to upload the file!
	</form>
 </body>
</html>

//streamingapi.jsp

<%@page contentType="text/html;charset=UTF-8" pageEncoding="UTF-8" language="java"%>
<%@page import="java.io.*"%>
<%@page import="

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Apache FileUpload的两种上传形式介绍

环境：

Traditional API上传方式

Streaming API上传方式

相关资料更多>

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