这个例子展示了如何使用JSP将用户指定的本地文件上传到服务器某个目录下面。
首先是文件上传的用户界面：
界面如下：
UploadServlet.jsp的源代码：
<%@ page import="java.io.*,java.util.*, javax.servlet.*" %> <%@ page import="javax.servlet.http.*" %> <%@ page import="org.apache.commons.fileupload.*" %> <%@ page import="org.apache.commons.fileupload.disk.*" %> <%@ page import="org.apache.commons.fileupload.servlet.*" %> <%@ page import="org.apache.commons.io.output.*" %> <% System.out.println("my file upload jsp file called!"); File file ; int maxFileSize = 5000 * 1024; int maxMemSize = 5000 * 1024; ServletContext context = pageContext.getServletContext(); String filePath = context.getInitParameter("file-upload"); String contentType = request.getContentType(); if ((contentType.indexOf("multipart/form-data") >= 0)) { DiskFileItemFactory factory = new DiskFileItemFactory(); factory.setSizeThreshold(maxMemSize); factory.setRepository(new File("c:\\temp")); ServletFileUpload upload = new ServletFileUpload(factory); upload.setSizeMax( maxFileSize ); try{ List fileItems = upload.parseRequest(request); Iterator i = fileItems.iterator(); out.println("<html>"); out.println("<head>"); out.println("<title>JSP File upload</title>"); out.println("</head>"); out.println("<body>"); while ( i.hasNext () ) { FileItem fi = (FileItem)i.next(); if ( !fi.isFormField () ) { String fieldName = fi.getFieldName(); String fileName = fi.getName(); boolean isInMemory = fi.isInMemory(); long sizeInBytes = fi.getSize(); if( fileName.lastIndexOf("\\") >= 0 ){ file = new File( filePath , fileName.substring( fileName.lastIndexOf("\\"))) ; }else{ file = new File( filePath , fileName.substring(fileName.lastIndexOf("\\")+1)) ; } fi.write( file ) ; out.println("Uploaded Filename: " + filePath + fileName + "<br>"); } } out.println("</body>"); out.println("</html>"); }catch(Exception ex) { System.out.println(ex); } }else{ out.println("<html>"); out.println("<head>"); out.println("<title>Servlet upload</title>"); out.println("</head>"); out.println("<body>"); out.println("<p>No file uploaded</p>"); out.println("</body>"); out.println("</html>"); } %>
web.xml的内容：
用Choose File选中一个本地文件，然后点击Upload File进行上传：
上传成功，在c盘temp文件夹下发现了成功上传的文件：
