各位大神好，小弟有个关于Java网络编程的基本问题想要咨询

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各位大神好，小弟有个关于Java网络编程的基本问题想要咨询10

小弟正准备上大二，不是学计算机或软件的，Java就上过几节选修课，所以发邮件问老师也不理我，于是来寻求各位大神的帮助。
以下是一个即时通信的程序，在客户端在自己的电脑中（即点击ChatClient的Link按钮后输入127.0.0.1）时可以工作。但是把客户端给别人，自己打开ChatServer，客户端输入我的IP地址时总是显示连接失败。不知各位大神有何指点。
这是服务端
import java.awt.*;
import java.awt.event.*;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.net.*;
public class ChatServer extends Frame implements ActionListener{
TextArea ta=new TextArea();
TextField tf=new TextField(30);
Button b=new Button("Send");
Panel p=new Panel();
ServerSocket ss;
Socket s;
DataInputStream dis;
DataOutputStream dos;
void lanchWindow(){
b.addActionListener(this);
ta.setEditable(false);
p.add(tf);
p.add(b);
this.add(ta,"Center");
this.add(p,"South");
this.addWindowListener(new WindowAdapter(){
public void windowClosing(WindowEvent e){
System.exit(0);
try{
dis.close();
dos.close();
ss.close();
s.close();
}catch(Exception ec){

}

}
});
this.setBounds(300,300,500,300);
this.setVisible(true);
this.setTitle("Server");
}
public void actionPerformed(ActionEvent e){
String s=tf.getText();
ta.append(s+"\n");
tf.setText(" ");
try{
dos.writeUTF(s);

}catch(Exception ex){

}

}
public static void main(String arg[]){
ChatServer cs=new ChatServer();
cs.lanchWindow();
try{
cs.ss=new ServerSocket(8888);
cs.s=cs.ss.accept();
while(true){
cs.dis=new DataInputStream(cs.s.getInputStream());
cs.dos=new DataOutputStream(cs.s.getOutputStream());
cs.ta.append("Client say: "+cs.dis.readUTF()+"\n");
}
}catch(Exception e){

}
}

}
这是客户端
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.net.*;
import javax.swing.*;
public class ChatClient extends Frame implements ActionListener{
TextArea ta=new TextArea();
TextField tf=new TextField(30);
Button b=new Button("Send");
Button b2=new Button("Link");
Panel p=new Panel();
Socket s;
DataInputStream dis;
DataOutputStream dos;
boolean connected=false;
void lanchWindow(){
b.addActionListener(this);
b2.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
String inputValue = JOptionPane.showInputDialog("Please input the Server ID");
ChatClient.this.connect(inputValue);
ChatClient.this.connected=true;
}
});
ta.setEditable(false);
p.add(tf);
p.add(b);
p.add(b2);
this.add(ta,"Center");
this.add(p,"South");
this.setBounds(300,300,500,300);
this.setVisible(true);
this.setTitle("Client");
this.addWindowListener(new WindowAdapter(){
public void windowClosing(WindowEvent e){
ChatClient.this.disconnect();
System.exit(0);
}
});
}
void connect(String str){
try{
s=new Socket(str,8888);
dos=new DataOutputStream(s.getOutputStream());
dis=new DataInputStream(s.getInputStream());
ta.append("Succeed Connect: "+str+"\n");
dos.writeUTF("A Client In");
}catch(Exception e1){
JOptionPane.showMessageDialog(null, "The Server Off", "Sorry", JOptionPane.ERROR_MESSAGE);
System.exit(0);
}

}
void disconnect(){
try{
dos.close();
dis.close();
s.close();
}catch(Exception e2){

}

}
public void actionPerformed(ActionEvent e){
String s=tf.getText();
ta.append(tf.getText()+"\n");
tf.setText("");
try{
dos.writeUTF(s);
}catch(Exception e3){

}
}
public static void main(String arg[]){
ChatClient cc=new ChatClient();
cc.lanchWindow();
try{
while(cc.connected){
cc.ta.append("The Server say: "+cc.dis.readUTF()+"\n");
}
}catch(Exception e){

}
}
}