结合前边学到得知识，和最近复习得网络编程得知识内容，做了一个带有GUI界面的liao聊天室Demo。发布到这里希望能够帮到需要帮助的人。
代码如下：
package day26_Internet;
import java.awt.BorderLayout;
import java.awt.Button;
import java.awt.Color;
import java.awt.Font;
import java.awt.Frame;
import java.awt.Panel;
import java.awt.TextArea;
import java.awt.TextField;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.io.BufferedWriter;
import java.io.ByteArrayOutputStream;
import java.io.FileInputStream;
import java.io.FileWriter;
import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;
import java.text.SimpleDateFormat;
import java.util.Date;
public class GUI_Chat extends Frame{
private TextArea viewArea;
private TextArea sendArea;
private TextField testField;
private Button log;
private Button send;
private Button clear;
private Button shake;
private DatagramSocket socket;
private BufferedWriter rw;
public GUI_Chat(){
init();
southPanel();
centerPanel();
event();
}private void event() {
//设置窗体响应
this.addWindowListener(new WindowAdapter() {
@Override
public void windowClosing(WindowEvent e) {
try {
rw.close();
} catch (IOException e1) {
e1.printStackTrace();
}
socket.close();
System.exit(0);
}
});
send.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
try {
send();
} catch (IOException e1) {
e1.printStackTrace();
}
}
});
log.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
try {
RecordLog();
} catch (IOException e1) {
e1.printStackTrace();
}
}
});
clear.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
viewArea.setText("");
}
});
shake.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
//shake();
try {
send(new byte[]{-1},testField.getText());
} catch (IOException e1) {
e1.printStackTrace();
}
}
});
sendArea.addKeyListener(new KeyAdapter() {
@Override
public void keyPressed(KeyEvent e) {
if(e.getKeyCode() == KeyEvent.VK_ENTER){
try {
send();
} catch (IOException e1) {
e1.printStackTrace();
}
}
}
});
}private void shake() {
int x = this.getLocation().x; //获取横坐标位置
int y = this.getLocation().y; //获取纵坐标位置
for(int i =0;i<20;i++){
this.setLocation(x+10, y+10);
this.setLocation(x+10, y-10);
this.setLocation(x-10, y+10);
this.setLocation(x-10, y-10);
this.setLocation(x, y);
}
}
private void RecordLog() throws IOException {
rw.flush(); //刷新缓冲区
FileInputStream in = new FileInputStream("config.txt");
ByteArrayOutputStream bt = new ByteArrayOutputStream(); //创建内存缓冲区
int len;
byte[] arr = new byte[1024*8];
while((len = in.read(arr))!=-1){
bt.write(arr, 0, len);
}
String s = bt.toString();
viewArea.setText(s);
in.close();
}
private void send(byte[] arr,String ip) throws IOException{
DatagramPacket packet = new DatagramPacket(arr,arr.length,InetAddress.getByName(ip),9999);
socket.send(packet);
}
private void send() throws IOException {
String message = sendArea.getText(); //获取发送区域的内容
String ip = testField.getText(); //获取IP地址
ip = ip.trim().length() == 0 ? "255.255.255.255" : ip;
DatagramPacket packet = new DatagramPacket(message.getBytes(),message.getBytes().length,InetAddress.getByName(ip),9999);
socket.send(packet); //发送数据
String time = getCurrentTime(); //创建当前日期对象
String str = time+" 我对 "+(ip.equals("255.255.255.2555") ? "所有人" : ip)+" 说:\r\n"+message+"\r\n\r\n";
viewArea.append(str); //将信息添加到显示区域中
rw.write(str);
sendArea.setText(null); //清空发送数据
}
private String getCurrentTime() {
Date date = new Date(); //获取当前日期
SimpleDateFormat sdfDateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
return sdfDateFormat.format(date); //将时间格式化返回
}private void centerPanel() {
Panel center = new Panel(); //创建中间的Panel
viewArea = new TextArea();
sendArea = new TextArea(5,1);
center.setLayout(new BorderLayout()); //设置边界布局管理器
center.add(sendArea,BorderLayout.SOUTH); //发送区域在南边
viewArea.setEditable(false); //设置不可以编辑
viewArea.setBackground(Color.WHITE); //设置界面颜色
center.add(viewArea,BorderLayout.CENTER); //显示区域在中间
sendArea.setFont(new Font("xxx",Font.PLAIN, 15)); //设置字体
viewArea.setFont(new Font("xxx",Font.PLAIN, 15)); //设置字体
this.add(center,BorderLayout.CENTER);
}private void southPanel(){
Panel south = new Panel(); //创建下边Panel
testField = new TextField(15);
testField.setText("127.0.0.1"); //设置显示输入框的默认值
send = new Button("Send"); //设置Button的内容
log = new Button("Record");
clear = new Button("Clear");
shake = new Button("Shake");
south.add(testField); //将按钮添加到下部Panel位置
south.add(send);
south.add(log);
south.add(clear);
south.add(shake);
this.add(south,BorderLayout.SOUTH); //将Panel放在Frame的南边
}private void init() {
this.setLocation(800,150); //设置窗体的位置
new Receive().start();
this.setSize(400, 600); //设置窗体大小
try {
socket = new DatagramSocket(); //创建Socket
rw = new BufferedWriter(new FileWriter("config.txt",true)); //需要在尾部追加
}catch (IOException e) {
e.printStackTrace();
}
this.setVisible(true); //设置窗体可见属性
}
private class Receive extends Thread{
public void run(){
try {
DatagramSocket socket = new DatagramSocket(9999);
DatagramPacket packet = new DatagramPacket(new byte[1024*8],1024*8);
while(true){
socket.receive(packet); //接收数据
byte[] arr = packet.getData();
int length = packet.getLength();
if(arr[0]==-1&&length == 1){
shake();
continue;
}
String ip = packet.getAddress().getHostAddress(); //获得IP地址
String time = getCurrentTime(); //获取时间
String str = time+" "+ip+" 对我说:\r\n"+new String(arr, 0, length)+"\r\n\r\n";
rw.write(str);
viewArea.append(str);
}
} catch (IOException e) {
e.printStackTrace();
}
}
}
public static void main(String[] args){
new GUI_Chat();
}
}
结果如下：
