网络聊天室模拟程序 - 黑马程序员技术交流社区

import java.awt.BorderLayout;
import java.awt.Button;
import java.awt.Color;
import java.awt.Dialog;
import java.awt.FlowLayout;
import java.awt.Frame;
import java.awt.Label;
import java.awt.Panel;
import java.awt.TextArea;
import java.awt.TextField;
import java.awt.Toolkit;
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.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileReader;
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;
import java.util.TimeZone;
class GuiChat {
private TextField textField;
private TextArea sendTextArea;
private TextArea receiveTextArea;
private Frame frame;
private Button b;
private Dialog dia;
private Label lb;
public GuiChat() {
frame = createFrame();
frame.setBackground(Color.BLUE);
Panel sendPanel = createSendPanel();
Panel textPanel = createTextPanel();
frame.add(textPanel); // 将textPanel放在frame的CENTER
frame.add(sendPanel, BorderLayout.SOUTH); // 将sendPanel放在frame的SOUTH
frame.setVisible(true);
}
private Panel createTextPanel() {
Panel textPanel = new Panel();
textPanel.setLayout(new BorderLayout()); // Panel默认是FlowLayout, 改为BorderLayout
receiveTextArea = new TextArea();receiveTextArea.setBackground(Color.PINK);
sendTextArea = new TextArea(7, 100); // 设置TextArea的行数为7行, 列数会因为边界布局忽略
sendTextArea.setBackground(Color.PINK);
receiveTextArea.setEditable(false); // 将receiveTextArea设置为不可编辑, 背景颜色会默认变为灰色
//receiveTextArea.setBackground(Color.WHITE); // 设置receiveTextArea背景颜色为白色
textPanel.add(receiveTextArea); // 放在Panel的CENTER
textPanel.add(sendTextArea, BorderLayout.SOUTH); // 放在Panel的SOUTH
sendTextArea.addKeyListener(new KeyAdapter() {
public void keyPressed(KeyEvent e) {
if (e.getKeyCode() == KeyEvent.VK_ENTER && e.isControlDown()) { // 判断按下的是CTRL+ENTER
send();
e.consume(); // 取消这次输入, 让回车失效
}
}
});
return textPanel;
}
private Panel createSendPanel() {
Panel sendPanel = new Panel();
textField = new TextField(25);
textField.setBackground(Color.PINK);
Button sendButton = new Button("发送");sendButton.setBackground(Color.YELLOW);
Button clearButton = new Button("清屏");clearButton.setBackground(Color.YELLOW);
Button logButton = new Button("聊天记录");logButton.setBackground(Color.YELLOW);
Button clearjilu = new Button("清除记录");clearjilu.setBackground(Color.YELLOW);
sendPanel.add(textField);
sendPanel.add(sendButton);
sendPanel.add(clearButton);
sendPanel.add(logButton);
sendPanel.add(clearjilu);
clearjilu.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e) {
File f = new File("c:\\Program Files\\");
File[] names = f.listFiles();
receiveTextArea.setText("");
for(File name:names){
if(name.getName()=="jilu")
name.delete();
}
try {
FileWriter fw = new FileWriter("C:\\Program Files\\jilu");
fw.write("");
} catch (IOException e1) {
e1.printStackTrace();
}
}
});
sendButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
send();
}
});
clearButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
receiveTextArea.setText("");
}
});
logButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
loadLog();
}
});
return sendPanel;
}
private void loadLog() {
BufferedReader reader = null;
try {
reader = new BufferedReader(new FileReader("C:\\Program Files\\jilu.txt"));//
StringBuilder sb = new StringBuilder();
int ch;
while ((ch = reader.read()) != -1)
sb.append((char) ch);
receiveTextArea.setText(sb.toString());
} catch (IOException e) {
e.printStackTrace();
} finally {
if (reader != null)
try {
reader.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
private void send() {
String ip = textField.getText(); // 获取textField中的地址
ip = "".equals(ip) ? "255.255.255.255" : ip; // 如果ip地址为空, 就改为255.255.255.255
String content = sendTextArea.getText(); // 获取sendTextArea中的内容
String head = getTime() + " 我对 " + ("255.255.255.255".equals(ip) ? "所有人" : ip) + " 说:\r\n"; // 获取时间, 组装一个字符串显示
receiveTextArea.append(head + content + "\r\n\r\n"); // 向receiveTextArea中追加内容
sendMsg(ip, content); // 将content发送到ip
saveLog(head + content + "\r\n\r\n");
sendTextArea.setText(""); // 清除sendTextArea中的内容
}
private synchronized void saveLog(String s) {
BufferedWriter writer = null;
try {
writer = new BufferedWriter(new FileWriter("C:\\Program Files\\jilu", true)); // true表示向文件追加
writer.write(s);
} catch (IOException e) {
e.printStackTrace();
} finally {
if (writer != null)
try {
writer.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
private String getTime() {
TimeZone.setDefault(TimeZone.getDefault());
SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
return format.format(new Date());
}
private void sendMsg(String ip, String content) {
DatagramSocket socket = null;
try {
socket = new DatagramSocket();
byte[] b = content.getBytes();
if(b.length==0){
Dialog dia=createDialog();
dia.setVisible(true);
}
DatagramPacket packet = new DatagramPacket(b, b.length, InetAddress.getByName(ip), 8888);
socket.send(packet);
} catch (IOException e) {
e.printStackTrace();
} finally {
if (socket != null)
socket.close();
}
}
private Dialog createDialog() {
dia = new Dialog(frame,"消息提示",true);
dia.setBackground(Color.GREEN);
b = new Button("确定");
b.setBackground(Color.BLUE);
lb = new Label(" 不能输入空消息 ");
dia.add(lb);
dia.setBounds(300, 250, 300, 200);
dia.setLayout(new FlowLayout());
dia.add(b);
b.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e) {
dia.dispose();
}
});
dia.addWindowListener(new WindowAdapter(){
public void windowClosing(WindowEvent e){
dia.dispose();
}
});
return dia;
}
private Frame createFrame() {
Frame frame = new Frame("华东---------模拟聊天室");
frame.setSize(500, 600);
frame.setLocation(300, 100);
frame.setIconImage(Toolkit.getDefaultToolkit().createImage("G:\\DCIM\\.thumbnails\\1335314618830.jpg"));
frame.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
e.getWindow().dispose();
}
});
return frame;
}
public static void main(String[] args) {
new GuiChat();
}
}

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