java在线聊天项目0.6版 解决客户端关闭后异常问题 dis.readUTF()循环读取已关闭的socket

服务端对try catch finally重新进行了定义，当发生异常，主动提示，或关闭出现异常的socket

服务器端代码修改如下：

package com.swift;

import java.io.DataInputStream;
import java.io.IOException;
import java.net.ServerSocket;
import java.net.Socket;

public class ChatServer {

public static void main(String[] args) {
boolean started=false;
ServerSocket ss=null;
DataInputStream dis=null;
Socket s = null;
try {
ss = new ServerSocket(8888);
started=true;
} catch (IOException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
try {
while(started) {
boolean connected=false;
s = ss.accept();
connected=true;
System.out.println("a client connected success");
dis=new DataInputStream(s.getInputStream());
while(connected) {
String str=dis.readUTF();
System.out.println(str);
}
}
} catch (Exception e) {
//e.printStackTrace();
System.out.println("client has closed.");
}finally {
if(dis!=null) {
try {
dis.close();
} catch (IOException e) {
e.printStackTrace();
}
}
if(s!=null) {
try {
s.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}

}

客户端换了一个OutputStream，使用DataOutputStream发送信息，dos.writeUTF(tf.getText());

0.6版效果图



客户端代码修改如下：

package com.swift;

import java.awt.BorderLa
c0c1
yout;
import java.awt.Color;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.io.DataOutputStream;
import java.io.IOException;
import java.net.Socket;
import java.net.UnknownHostException;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.JTextField;

public class ChatClientFrame extends JFrame {

private static final long serialVersionUID = -118470059355655240L;
Socket s=null;
DataOutputStream dos=null;
JLabel label_shang=new JLabel();
JLabel label_xia=new JLabel();
JTextField tf = new JTextField(38);
JTextArea ta = new JTextArea(15, 50);
JButton button=new JButton();

public ChatClientFrame() {
setBounds(200, 200, 500, 400);
setTitle("客户端聊天工具 —— 0.6");
//对窗口进行大的布局，分为三行一列，在pBasic面板上添加三个面板shang zhong xia
JPanel pBasic=new JPanel();
pBasic.setLayout(new BorderLayout());//不设置默认也是这种布局模式
setContentPane(pBasic);//把面板放在窗口上，不记得用this.关键字
JPanel shang=new JPanel();
JPanel zhong=new JPanel();
JPanel xia=new JPanel();
//设置JPanel面板的大小
shang.setSize(470, 25);
zhong.setSize(470, 180);
xia.setSize(470, 40);
pBasic.add(shang,BorderLayout.NORTH);
pBasic.add(zhong,BorderLayout.CENTER);
pBasic.add(xia,BorderLayout.SOUTH);
shang.setBackground(Color.red);
zhong.setBackground(Color.yellow);
xia.setBackground(Color.blue);

label_shang.setText("聊天记录");
shang.add(label_shang);
ta.setLineWrap(true);// 自动换行
JScrollPane scroll=new JScrollPane(ta);// 增加滚动条，以便不增加行数
zhong.add(scroll);
label_xia.setText("输入信息");
xia.add(label_xia,BorderLayout.WEST);
/*
* 增加功能，窗口监听事件，窗口打开时设置光标焦点在tf文本域中
*/
this.addWindowListener(new WindowAdapter() {
@Override
public void windowOpened(WindowEvent e) {
tf.requestFocus();
}
});
xia.add(tf,BorderLayout.CENTER);
button.setText("发送");
xia.add(button,BorderLayout.EAST);

final class ShareListener implements ActionListener{

@Override
public void actionPerformed(ActionEvent e) {
String taText=ta.getText();
String tfText=tf.getText()+"\r\n";
String tfText1=tf.getText();
ta.setText(taText+tfText);
tf.setText("");
//当回车或发送按钮时，tfText发送到服务器
try {
dos.writeUTF(tfText1);
dos.flush();
} catch (IOException e1) {
e1.printStackTrace();
}

}
}
button.addActionListener(new ShareListener());
tf.addActionListener(new ShareListener());
//通过压缩自动调整各个面板
pack();
this.addWindowListener(new WindowAdapter() {
@Override
public void windowClosing(WindowEvent e) {
disconnect();
System.exit(0);
}
});
setVisible(true);
//创建窗体直接调用连接服务器
connect();
}

public void connect() {
try {
s=new Socket("127.0.0.1",8888);
System.out.println("connected!");
dos=new DataOutputStream(s.getOutputStream());

} catch (UnknownHostException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
public void disconnect() {
try {
dos.close();
s.close();
} catch (IOException e) {
e.printStackTrace();
}
}

public static void main(String[] args) {
new ChatClientFrame();
}

}