服务器与聊天通信

Question

我有一个名为ClientPeer的类，另外两个是Message和PrivateMessage.I想要将我发送到服务器的文本发送回客户端，但我不知道如何，我尝试了不同的想法，但它没有工作。 这是代码：

     import java.net.*;
    import java.io.*;

       public class ClientPeer extends Thread{

String _username;
Socket _Socket;

public ClientPeer(String _username, Socket _Socket)

{
    this._username = _username;
    this._Socket = _Socket;
}
public void display()throws Exception
{
 ObjectInputStream _ois=new ObjectInputStream(_Socket.getInputStream());
// Message m=(Message)_ois.readObject();
 ObjectOutputStream _obs=new ObjectOutputStream(_Socket.getOutputStream());




}

public void run()
{
    try {
        display();
    } catch (Exception e) {

        e.printStackTrace();
    }

}
public void sendMessage(String _message) throws IOException {
    ObjectOutputStream _obj = new ObjectOutputStream(
            _Socket.getOutputStream());
    _obj.writeObject(new Message(_username, _message));
    _obj.flush();

}

public void sendMessage(String _message, String _receiver)
        throws IOException {
    ObjectOutputStream _obj = new ObjectOutputStream(
            _Socket.getOutputStream());
    _obj.writeObject(new PrivateMessage(_username, _message, _receiver));
    _obj.flush();
}
         }