Java Answers Forum - Applet to servlet communication

Articles |
News |
Weblogs |
Books |
Forums

Artima Forums | Articles | Weblogs | Java Answers | News

Sponsored Link •

Java Answers Forum
Applet to servlet communication

0 replies on 1 page.

Welcome Guest
Sign In

Back to Topic List

Reply to this Topic

Search Forum

Threaded View


Previous Topic		Next Topic

Flat View: This topic has 0 replies on 1 page

jtiendra taunk

Posts: 1
Nickname: jitendra
Registered: Sep, 2002

Applet to servlet communication

Posted: Sep 7, 2002 4:33 AM

Hi,
we are trying to communicate between an applet and a servlet.
but the servlet is not able to process the data posted by the applet.
what could be the reason.
please help :((
--jits

####### query applet code
import java.awt.*;
import java.applet.*;
import java.awt.event.*;
import java.io.*;
import java.net.*;

public class QueryApplet extends Applet implements ActionListener
{
TextField t_query ;
TextArea t_results;
Button btn_execute;

public void init()
{
Panel dbpanel = new Panel();
dbpanel.setLayout(new FlowLayout(FlowLayout.LEFT));
dbpanel.add(new Label("Query String:"));
t_query = new TextField("hello",50);
dbpanel.add(t_query);
btn_execute = new Button("Execute Query");
btn_execute.addActionListener(this);
dbpanel.add(btn_execute);
add("No rth", dbpanel);
t_results = new TextArea(10,80);
add("Center",t_results);
}
public void exec_query()
{
String qryString = t_query.getText();
try
{
URL url = new URL("http://localhost:8080/servlet/QueryServlet");
String query = URLEncoder.encode("query") + "=" + URLEncoder.encode(qryString);
URLConnection ucon = url.openConnection();
ucon.setDoOutput(true);
ucon.setDoInput(true);
ucon.setUs eCaches(false);
ucon.setRequestProperty("Content-Type","application/x-www-form-u rlencoded");
DataOutputStream outs = new DataOutputStream(ucon.getOutputStream());
outs.writeBytes(query);
outs.flush();
outs.close();
InputStreamReader ins = new InputStreamReader(ucon.getInputStream());
int chr = ins.read();
while(chr!=-1)
{
t_results.append(String.valueOf((char)chr));
chr = ins.read();
}
ins.close();
}
catch(MalformedURLException e )
{
t_results.setText(e.toString());
}

catch(IOException e )
{
t_results.setText(e.toString());
}
catch (Exception e)
{
System.out.println(e);
}
}

public void actionPerformed(ActionEvent ae)
{
exec_query();
}
}

######## Query Servlet code
import javax.servlet.*;
import javax.servlet.http.*;
import java.util.*;
import java.sql.*;
import java.io.*;

public class QueryServlet extends HttpServlet
{
Connection dbCon = null;
public void init() throws ServletException
{
try
{
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
dbCon = DriverManager.getConnection("jdbc:odbc:Logins", "" , "" );

}
catch (Exception e)
{
System.out.println(e);
}
}
public void doPost(HttpServletRequest req , HttpServletResponse res) throws ServletException , IOException
{
PrintWriter out = res.getWriter();
//res.setContentType("text/html");

try
{
String query = req.getParameter("query");;
out.println("param = "+query);
Statement s = dbCon.createStatement();
ResultSet rs = s.executeQuery(query);
while(rs.next())
{
out.println(rs.getString(1) + " - " + rs.getString(2));
out.println("");
}
}
catch (SQLException e)
{
System.out.println(e.toString());
return;
}

out.println();
out.close();
}
public void destroy()
{
try
{
dbCon.close();
}
catch (Exception e )
{
System.out.println(e);
}
}

}

Previous Topic

Next Topic


	Web Artima.com