import java.io.*;
import java.applet.applet;
import java.awt.*;

public class testdatastreamapplet extends applet
{
    string response;
    public  void  init(){     
      
      try{
         java.net.url url = new java.net.url(getdocumentbase(),"servlet/datastreamecho");         
         java.net.urlconnection con = url.openconnection(); 
         con.setusecaches(true);
         con.setdooutput(true);
         con.setdoinput(true);
         bytearrayoutputstream byteout = new bytearrayoutputstream();
         dataoutputstream out = new dataoutputstream(byteout);
         out.writeutf("hello world!");
         out.flush();
         byte buf[] =  byteout.tobytearray();         
         con.setrequestproperty("content-type","application/octest-stream");
         con.setrequestproperty("content-length",""+buf.length);
         dataoutputstream dataout = new dataoutputstream(con.getoutputstream());
         dataout.write(buf);
         dataout.flush();
	 dataout.close();

         datainputstream in = new datainputstream(con.getinputstream());
         response = in.readutf();
         system.out.println("read from server :" + response);
         in.close();  
      }
      catch(exception e){
         e.printstacktrace();
      }
      
   }

   public void paint(graphics g){
      g.drawstring("read from server :" + response,10,20);
       
   }
}

import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;

public class datastreamecho extends httpservlet{
       public void service(httpservletrequest req,httpservletresponse resp)
           throws servletexception ,java.io.ioexception
       {
           datainputstream in = new datainputstream(req.getinputstream());
           resp.setcontenttype("application/octest-stream");
           bytearrayoutputstream byteout = new bytearrayoutputstream();
           dataoutputstream out = new dataoutputstream(byteout);
           string response = in.readutf();
           out.writeutf(response);
           out.flush();
           byte buf[]= byteout.tobytearray();
           resp.setcontentlength(buf.length);
           servletoutputstream servletout = resp.getoutputstream();
           servletout.write(buf);
           servletout.close();  
       }

}