But starting from Servlet Specification 3.0 you dont need external library instead there is a native support. I wanted to try this so i followed these steps
- First i did create a index.jsp file like this
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<%@page
language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<html>
<head>
<title>index</title>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
</head>
<body>
<form action="hellofileupload" method="post" enctype="multipart/form-data" >
<table>
<tr>
<td>File</td>
<td><input type="file" name="samplefile" /></td>
</tr>
<tr><td><input type="submit"></td></tr>
</table>
</form>
</body>
</html>
If you want to upload a file to the server you will have to set form encoding type tomultipart/form-data
. The index.jsp will submit form to thehellofileupload
url and thats where ourHelloFileUploadAnnotationServlet
will come in - Next create a
HelloFileUploadAnnotationServlet
like this
package com.webspherenotes.j2ee6.servlet;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.Collection;
import java.util.Iterator;
import javax.servlet.ServletException;
import javax.servlet.annotation.MultipartConfig;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.Part;
/**
* Servlet implementation class HelloFileUploadAnnotationServlet
*/
@WebServlet("/hellofileupload")
@MultipartConfig
public class HelloFileUploadAnnotationServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
System.out.println("Entering HelloFileUploadAnnotationServlet.doPost()");
response.setContentType("text/html");
response.getWriter().println("Hello from FileUploadServlet");
CollectionfileParts = request.getParts();
IteratorfilePartIt = fileParts.iterator();
while(filePartIt.hasNext()){
Part filePart = filePartIt.next();
System.out.println("File Name " + filePart.getName());
System.out.println("File Size " + filePart.getSize());
System.out.println("File Content ");
BufferedReader fileReader =
new BufferedReader(new InputStreamReader(filePart.getInputStream()));
String line = null;
while(( line = fileReader.readLine()) != null){
System.out.println(line);
}
}
System.out.println("Exiting HelloFileUploadAnnotationServlet.doPost()");
}
}
In order to use the file upload first you will have to mark the Servlet usingMultipartConfig
annotation, indicating that instances of the Servlet expect requests that conform to themultipart/form-data
MIME type.
Then inside the doPost() method you can use the method of HttpServletRequest to get access to the uploaded file.
1 comment:
Thanks for info
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