How to read and write in file through JSP

<%@ page import="java.io.*" %>






<%
String fileName=getServletContext().getRealPath("jsp.txt");

File f=new File(fileName);

InputStream in = new FileInputStream(f);

BufferedInputStream bin = new BufferedInputStream(in);

DataInputStream din = new DataInputStream(bin);
StringBuffer sb=new StringBuffer();
while(din.available()>0)
{
sb.append(din.readLine());
}

try {
PrintWriter pw = new PrintWriter(new FileOutputStream("c:/file.txt"));// save file
pw.println(sb.toString());
pw.close();
} catch(IOException e) {
e.getMessage();
}

in.close();
bin.close();
din.close();
%>
Successfully write file