JSP上传文件到服务器（指定文件夹）
1、创建文件上传表单
upload.html
<html>
<head>
<title>File Uploading Form</title>
</head>
<body>
<h3>File Upload:</h3>
Select a file to upload: <br />
<form action="UpLoadFile.jsp" method="post"
enctype="multipart/form-data">
<input type="file" name="file" size="50" />
<br />
<input type="submit" value="Upload File" />
</form>
</body>
</html>
2、创建处理数据的jsp
UpLoadFile.jsp
<%@page import="org.apache.tomcat.util.http.fileupload.servlet.ServletRequestContext"%>
<%@page import="org.apache.tomcat.util.http.fileupload.FileItem"%>
<%@page import="org.apache.tomcat.util.http.fileupload.servlet.ServletFileUpload"%>
<%@page import="org.apache.tomcat.util.http.fileupload.disk.DiskFileItemFactory"%>
<%@ page import="java.io.*,java.util.*, javax.servlet.*" %>
<%@ page import="javax.servlet.http.*" %>
<%
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);
// ????????? maxMemSize.
factory.setRepository(new File("c:\\temp"));
// ??????????????
ServletFileUpload upload = new ServletFileUpload(factory);
// ???????????
upload.setSizeMax( maxFileSize );
try{
// ???????
//List fileItems = upload.parseRequest(request);//??????HttpServletRequest?????RequestContext
List fileItems = upload.parseRequest(new ServletRequestContext(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("No file uploaded");
out.println("</body>");
out.println("</html>");
}
%>
3、创建web.xml文件
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
version="3.1">
<context-param>
<description>Location to store uploaded file</description>
<param-name>file-upload</param-name>
<param-value>
C:\Users\Administrator\Documents\NetBeansProjects\uploadfiles\web\temp
</param-value>
</context-param>
</web-app>
4、运行upload.html即可