How Server can read client side SSL certificates through java code?

My code will be running on server which will be a java class that should read any SSL certificates for the user that is logging in to the application.
Kindly let me know how it can be achieved ? I have very rare knowldge on Security. how i can read SSL certificates of the client machine.
Also let me know the possible solutions for above question.

For my mud written in java, I used TCP/IP for the connections. When a client connects, he gets his own thread. Those threads are held in a vector in a manager class. each tick of the server does a quick run thru the vector and if the current thread/socket its on is null or !isAlive() its remove from the vector(which in turn removes it from getting any more game updates. This removal can be caused by two things. The clients disconnects by accident(kills his game, locks up has an internet connection hiccup, etc.) or he uses the games "quit" method. The quit method calls a method that does any player saving of data, etc then closes the socket, and sets it to null. thus the manager sees this and removes him frm the vecotr list on the next server tick. Seems to work great form a mud and worked really well in a multiplayer applet game I had up for a while.

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Dear sir/madam,
i'm doing my final year project and it is about a java client/server big2 game.But now i have a difficulties in dealing with the server side.
That is about how to take action on the serverside if the client suddenly disconnected.
I have read many java client/server programming scripts.But all of them doesn't mention this problem.The scrpits only assume the client side never disconnect suddenly.
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For my mud written in java, I used TCP/IP for the connections. When a client connects, he gets his own thread. Those threads are held in a vector in a manager class. each tick of the server does a quick run thru the vector and if the current thread/socket its on is null or !isAlive() its remove from the vector(which in turn removes it from getting any more game updates. This removal can be caused by two things. The clients disconnects by accident(kills his game, locks up has an internet connection hiccup, etc.) or he uses the games "quit" method. The quit method calls a method that does any player saving of data, etc then closes the socket, and sets it to null. thus the manager sees this and removes him frm the vecotr list on the next server tick. Seems to work great form a mud and worked really well in a multiplayer applet game I had up for a while.

Can anybody help on sending mail through Java Code

I am trying to send the mail using the java code and I am unable to do it. My code is
import java.io.*;
import java.net.*;
import java.util.*;
import java.text.*;
public class EmailExample {
public static void main(String[] args)
Socket smtpSocket;
DataOutputStream os;
BufferedReader is;
Date dDate = new Date();
DateFormat dFormat = DateFormat.getDateInstance(DateFormat.FULL,Locale.US);
try
smtpSocket = new Socket("www.gmail.com",80);
os = new DataOutputStream(smtpSocket.getOutputStream());
is = new BufferedReader(new InputStreamReader(smtpSocket.getInputStream()));
System.out.println("Hi How is this?");
os.writeBytes("HELLO\r\n");
// You will add the email address that the server
// you are using know you as.
os.writeBytes("MAIL From: <[email protected]>\r\n");
// Who the email is going to.
os.writeBytes("RCPT To: <[email protected]>\r\n");
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os.writeBytes("DATA\r\n");
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os.writeBytes("From: Me <[email protected]>\r\n");
os.writeBytes("To: YOU <[email protected]>\r\n");
//Again if you want to send a CC then add this.
//os.writeBytes("Cc: CCDUDE <[email protected]>\r\n");
//Here you can now add a BCC to the message as well
//os.writeBytes("RCPT Bcc: BCCDude<[email protected]>\r\n");
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os.writeBytes("Subject: Your subjectline here\r\n");
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os.writeBytes("\r\n.\r\n");
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} catch (IOException e) {
e.printStackTrace();
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Thanks.
Satya.

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How Server can read client side SSL certificates through java code?

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