File Upload instance:
JSP page: <% @ page Language ="Java"Import ="Java. util .*"Pageencoding ="UTF-8"%>
<%
String Path = request. getcontextpath ();
String basepath = request. getscheme () + ": //" + request. getservername () + ":" + request. getserverport () + path + "/";
%>
<! Doctype HTML public "-// W3C // dtd html 4.01 transitional // en">
<HTML>
<Head>
<Base href ="<% = Basepath %>">
<Title> upload page </title>
<Meta http-equiv ="Pragma"Content ="No-Cache">
<Meta http-equiv ="Cache-control"Content ="No-Cache">
<Meta http-equiv ="Expires"Content ="0">
<Meta http-equiv ="Keywords"Content ="Keyword1, keyword2, keyword3">
<Meta http-equiv ="Description"Content ="This is my page">
<! --
<LinkREL="Stylesheet"Type =" text/CSS"
Href= "Styles.css">
-->
</Head>
<Body>
<Form action ="$ {Pagecontext. Request. contextpath}/Uploadservlet2"Method ="Post"Enctype ="Multipart/form-Data">
Upload User: <input type ="Text"Name ="User"> <Br>
Upload File 1: <input type ="File"Name ="File1"> <Br>
Upload File 2: <input type ="File"Name ="File2"> <Br>
<Input type ="Submit"Value ="Start upload">
</Form>
<H2 >$ {message} </H2>
</Body>
</Html>
Description file:
<? XML version ="1.0"Encoding =UTF-8"?>
<Web-app version ="2.5"
Xmlns =Http://java.sun.com/xml/ns/javaee"
Xmlns: xsi =Http://www.w3.org/2001/XMLSchema-instance"
Xsi: schemalocation =Http://java.sun.com/xml/ns/javaee
Http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
<Display-Name> </display-Name>
<Servlet>
<Description> This is the description of my J2EE component </description>
<Display-Name> This is the display name of my J2EE component </display-Name>
<Servlet-Name> uploadservlet </servlet-Name>
<Servlet-class> com. hbsi. servlet. uploadservlet </servlet-class>
</Servlet>
<Servlet-mapping>
<Servlet-Name> uploadservlet </servlet-Name>
<URL-pattern>/uploadservlet </url-pattern>
</Servlet-mapping>
<Welcome-file-List>
<Welcome-File> index. jsp </welcome-File>
</Welcome-file-List>
</Web-app>
Selvelt:
Package com. hbsi. servlet;
Import java. Io. fileoutputstream;
Import java. Io. ioexception;
Import java. Io. inputstream;
Import java. util. List;
Import javax. servlet. servletexception;
Import javax. servlet. http. httpservlet;
Import javax. servlet. http. httpservletrequest;
Import javax. servlet. http. httpservletresponse;
Import org. Apache. commons. fileupload. fileitem;
Import org. Apache. commons. fileupload. fileuploadexception;
Import org. Apache. commons. fileupload. disk. diskfileitemfactory;
Import org. Apache. commons. fileupload. servlet. servletfileupload;
Public class uploadservlet extends httpservlet {
Private Static final long serialversionuid = 1l;
Public void doget (httpservletrequest request, httpservletresponse response)
Throws servletexception, ioexception {
Dopost (request, response );
}
Public void dopost (httpservletrequest request, httpservletresponse response)
Throws servletexception, ioexception {// upload a file
Try {
// (1) create a factory object fileitem
Diskfileitemfactory factory = new diskfileitemfactory ();
// (2) Get the parser
Servletfileupload upload = new servletfileupload (factory );
Upload. setheaderencoding ("UTF-8 ");
// (3) parse the request. There are several input items and there are several fileitem objects.
List <fileitem> List = upload. parserequest (request );
// (4) iterate the list set to obtain each item in the list set
For (fileitem item: List ){
// Determine the input type
If (item. isformfield ()){
// Normal input
String inputname = item. getfieldname ();
String inputvalue = item. getstring ();
System. Out. println (inputname + "" + inputvalue );
} Else {
// Input for File Upload
String filename = item. getname (); // name of the file to be uploaded
Filename = filename. substring (filename. lastindexof ("\") + 1 );
Inputstream is = item. getinputstream ();
Fileoutputstream Fos = new fileoutputstream ("d :\\" + filename );
Byte [] buff = new byte [1024];
Int Len = 0;
While (LEN = is. Read (buff)> 0 ){
FOS. Write (buff, 0, Len );
}
Is. Close ();
FOS. Close ();
Request. setattribute ("message", "uploaded successfully ");
}
}
} Catch (fileuploadexception e ){
// Todo auto-generated Catch Block
E. printstacktrace ();
Request. setattribute ("message", "Upload Failed ");
}
Request. getrequestdispatcher ("/upload. jsp"). Forward (request, response );
}
}
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