关于Java的聊天程序(功能未完成),为什么服务端和客户端启动会抛异常?我不希望它抛异常 ,程序没错误
问题描述:
服务端:
package cheat;
import java.io.*;
import java.net.*;
import java.awt.*;
import java.awt.Button;
import java.awt.event.*;
public class CheatServer {
public static void main(String[] args) {
new MyFrame("服务端");
}
}
class MyFrame extends Frame{
static boolean judge=true;
MyFrame(String s){
super(s);
this.addWindowListener(new WindowAdapter(){
public void windowClosing(WindowEvent e){
setVisible(false);
System.exit(0);
}
});
setLayout(new BorderLayout());
setBounds(200,200,250,300);
TextArea tr=new TextArea();
tr.setEditable(true);
Button b=new Button("终止");
Panel p=new Panel();
p.setLayout(new FlowLayout(FlowLayout.CENTER));
try {
ServerSocket ss=new ServerSocket(8888);
while(judge){
Socket s1=ss.accept();
tr.append("用户接入成功!"+" ");
}
} catch (IOException er) {
tr.setText("服务出错!"+" ");// 为何跑出?
}
b.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent ee){
judge=false;
tr.setText("服务终止");
}
});
p.add(b);
add("North",tr);
add("South",p);
setVisible(true);
}
}
客户端:
package cheat;
import java.net.*;
import java.io.*;
import java.awt.*;
import java.awt.event.*;
import java.awt.Button;
public class CheatClent{
public static void main(String[] args){
new MyFreame("客户端");
}
}
class MyFreame extends Frame{
MyFreame(String s){
super(s);
setBounds(200,200,400,500);
setLayout(new BorderLayout());
TextArea tr=new TextArea();
tr.setEditable(false);
TextField tf=new TextField();
add("North",tr);
add("South",tf);
this.addWindowListener(new WindowAdapter(){
public void windowClosing(WindowEvent e){
setVisible(false);
System.exit(0);
}
});
setVisible(true);
try {
Socket client=new Socket("127.0.0.1",8888);
} catch (IOException er) {
tr.setText("连接出错!");// 为何跑出?
}
}
}
答
程序功能确实不全,出现连接错误主要是因为你的运行步骤出错了,应该先运行服务器端,创建了8888端口的serversocket,再运行客户端,
才能连接上8888端口,这样就不会出错了。