Java lovers: upload.parseRequest (request) returns empty

2014年5月14日星期三

upload.parseRequest (request) returns empty


  <html>
  <head>
  <title>excel导入到数据库</title>
  </head>
  <body>
  	<h3>excel导入到数据库:</h3>
  	选择一个文件进行上传:
  	<br />
  	<form action="UploadFile_view.jsp?action=submit" method="post"
  		enctype="multipart/form-data">
  		<input type="file" name="file" size="50" /> <br /> <input
  			type="submit" value="上传" />
  	</form>
  	<%
  		if (request.getParameter("action") != null) {
  			if (request.getParameter("action").equals("submit")) {
  				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);
  					List fileItems = upload.parseRequest(request);
  				}
  			}
  		}
  	%>
  </body>
  </html>

is here fileItems is empty , and there is great God help facie right
------ Solution --------------------- -----------------------
<%
if (request.getParameter ("action")! = null) {
if (request.getParameter ("action"). equals ("submit")) ; {
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) ;
List fileItems = ; upload.parseRequest (request);
}
}
}
%>

This one should be written in the action corresponding jsp page in
------ For reference only ----------------------- ----------------
me directly to the background processing and user test jsp pages together , the sentence below the process is returned to the empty phrase , that is, request did not pass over, would like to ask a moderator greatly under what circumstances request transfer less action inside , ah, I'm not using the struts open platform for the company to buy .
------ For reference only -------------------------------------- -

? action = submit "method =" post " marked in red is actually a way to get this way , but your method definition is post.
------ For reference only -------------------------------------- -
Well, I changed the ingredients in the two files inside, as follows

<html>
  <head>
  <title>excel导入到数据库</title>
  </head>
  <body>
  	<h3>excel导入到数据库:</h3>
  	选择一个文件进行上传:
  	<br />
  	<form action="UploadFile.jsp" method="post"
  		enctype="multipart/form-data">
  		<input type="file" name="file" size="50" /> <br /> <input
  			type="submit" value="上传" />
  	</form>
  </body>
  </html>

<%
  //UploadFile.jsp
  	File file;
  	int maxFileSize = 5000 * 1024;
  	int maxMemSize = 5000 * 1024;
  	ServletContext context = pageContext.getServletContext();
  	String filePath = context.getInitParameter("file-upload");
  	
  	// 验证上传内容了类型
  	String contentType = request.getContentType();	
  
  	if ((contentType.indexOf("multipart/form-data") >= 0)) {
  		
  		DiskFileItemFactory factory = new DiskFileItemFactory();
  		// 设置内存中存储文件的最大值
  		
  		factory.setSizeThreshold(maxMemSize);
  		// 本地存储的数据大于 maxMemSize.
  		factory.setRepository(new File("c:\\temp"));
  
  		// 创建一个新的文件上传处理程序
  		ServletFileUpload upload = new ServletFileUpload(factory);
  		// 设置最大上传的文件大小	
  		upload.setSizeMax(maxFileSize);
  		try {
  			// 解析获取的文件
  			List fileItems = upload.parseRequest(request);
  			// 处理上传的文件
  			out.println(fileItems);

but the measured result was empty. Sorry ah , I was a beginner , you may have more problems
------ For reference only ------------------------- --------------

issue is resolved, the platform will request jsp page request filtering , and more eggs pain is no exception interface provides only In other methods , thank you for help.

Java lovers

2014年5月14日星期三

upload.parseRequest (request) returns empty

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