1. import java.awt.BorderLayout;
   
2. import java.awt.Button;
   
3. import java.awt.Color;
   
4. import java.awt.Dialog;
   
5. import java.awt.FlowLayout;
   
6. import java.awt.Frame;
   
7. import java.awt.Label;
   
8. import java.awt.Panel;
   
9. import java.awt.TextArea;
   
10. import java.awt.TextField;
    
11. import java.awt.Toolkit;
    
12. import java.awt.event.ActionEvent;
    
13. import java.awt.event.ActionListener;
    
14. import java.awt.event.KeyAdapter;
    
15. import java.awt.event.KeyEvent;
    
16. import java.awt.event.WindowAdapter;
    
17. import java.awt.event.WindowEvent;
    
18. import java.io.BufferedReader;
    
19. import java.io.BufferedWriter;
    
20. import java.io.File;
    
21. import java.io.FileReader;
    
22. import java.io.FileWriter;
    
23. import java.io.IOException;
    
24. import java.net.DatagramPacket;
    
25. import java.net.DatagramSocket;
    
26. import java.net.InetAddress;
    
27. import java.text.SimpleDateFormat;
    
28. import java.util.Date;
    
29. import java.util.TimeZone;
    
30. 
    
31. class GuiChat {
    
32. private TextField textField;
    
33. private TextArea sendTextArea;
    
34. private TextArea receiveTextArea;
    
35. private Frame frame;
    
36. private Button b;
    
37. private Dialog dia;
    
38. private Label lb;
    
39. public GuiChat() {
    
40. frame = createFrame();
    
41. frame.setBackground(Color.BLUE);
    
42. Panel sendPanel = createSendPanel();
    
43. Panel textPanel = createTextPanel();
    
44. frame.add(textPanel); // 将textPanel放在frame的CENTER
    
45. frame.add(sendPanel, BorderLayout.SOUTH); // 将sendPanel放在frame的SOUTH
    
46. frame.setVisible(true);
    
47. }
    
48. private Panel createTextPanel() {
    
49. Panel textPanel = new Panel();
    
50. textPanel.setLayout(new BorderLayout()); // Panel默认是FlowLayout, 改为BorderLayout
    
51. receiveTextArea = new TextArea();receiveTextArea.setBackground(Color.PINK);
    
52. 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
    
53. sendTextArea.setBackground(Color.PINK);
    
54. receiveTextArea.setEditable(false); // 将receiveTextArea设置为不可编辑, 背景颜色会默认变为灰色
    
55. //receiveTextArea.setBackground(Color.WHITE); // 设置receiveTextArea背景颜色为白色
    
56. textPanel.add(receiveTextArea); // 放在Panel的CENTER
    
57. textPanel.add(sendTextArea, BorderLayout.SOUTH); // 放在Panel的SOUTH
    
58. 
    
59. sendTextArea.addKeyListener(new KeyAdapter() {
    
60. public void keyPressed(KeyEvent e) {
    
61. if (e.getKeyCode() == KeyEvent.VK_ENTER && e.isControlDown()) { // 判断按下的是CTRL+ENTER
    
62. send();
    
63. e.consume(); // 取消这次输入, 让回车失效
    
64. }
    
65. }
    
66. });
    
67. return textPanel;
    
68. }
    
69. private Panel createSendPanel() {
    
70. Panel sendPanel = new Panel();
    
71. textField = new TextField(25);
    
72. textField.setBackground(Color.PINK);
    
73. Button sendButton = new Button("发送");sendButton.setBackground(Color.YELLOW);
    
74. Button clearButton = new Button("清屏");clearButton.setBackground(Color.YELLOW);
    
75. Button logButton = new Button("聊天记录");logButton.setBackground(Color.YELLOW);
    
76. Button clearjilu = new Button("清除记录");clearjilu.setBackground(Color.YELLOW);
    
77. sendPanel.add(textField);
    
78. sendPanel.add(sendButton);
    
79. sendPanel.add(clearButton);
    
80. sendPanel.add(logButton);
    
81. sendPanel.add(clearjilu);
    
82. clearjilu.addActionListener(new ActionListener(){
    
83. public void actionPerformed(ActionEvent e) {
    
84. File f = new File("c:\\Program Files\\");
    
85. File[] names = f.listFiles();
    
86. receiveTextArea.setText("");
    
87. for(File name:names){
    
88. if(name.getName()=="jilu")
    
89. name.delete();
    
90. }
    
91. try {
    
92. FileWriter fw = new FileWriter("C:\\Program Files\\jilu");
    
93. fw.write("");
    
94. } catch (IOException e1) {
    
95. 
    
96. e1.printStackTrace();
    
97. }
    
98. }
    
99. });
    
100. sendButton.addActionListener(new ActionListener() {
     
101. public void actionPerformed(ActionEvent e) {
     
102. send();
     
103. }
     
104. });
     
105. clearButton.addActionListener(new ActionListener() {
     
106. public void actionPerformed(ActionEvent e) {
     
107. receiveTextArea.setText("");
     
108. }
     
109. });
     
110. logButton.addActionListener(new ActionListener() {
     
111. public void actionPerformed(ActionEvent e) {
     
112. loadLog();
     
113. }
     
114. });
     
115. return sendPanel;
     
116. }
     
117. private void loadLog() {
     
118. BufferedReader reader = null;
     
119. try {
     
120. reader = new BufferedReader(new FileReader("C:\\Program Files\\jilu.txt"));//
     
121. StringBuilder sb = new StringBuilder();
     
122. int ch;
     
123. while ((ch = reader.read()) != -1)
     
124. sb.append((char) ch);
     
125. receiveTextArea.setText(sb.toString());
     
126. } catch (IOException e) {
     
127. e.printStackTrace();
     
128. } finally {
     
129. if (reader != null)
     
130. try {
     
131. reader.close();
     
132. } catch (IOException e) {
     
133. e.printStackTrace();
     
134. }
     
135. }
     
136. }
     
137. private void send() {
     
138. String ip = textField.getText(); // 获取textField中的地址
     
139. ip = "".equals(ip) ? "255.255.255.255" : ip; // 如果ip地址为空, 就改为255.255.255.255
     
140. String content = sendTextArea.getText(); // 获取sendTextArea中的内容
     
141. 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
     
142. receiveTextArea.append(head + content + "\r\n\r\n"); // 向receiveTextArea中追加内容
     
143. 
     
144. sendMsg(ip, content); // 将content发送到ip
     
145. 
     
146. saveLog(head + content + "\r\n\r\n");
     
147. 
     
148. sendTextArea.setText(""); // 清除sendTextArea中的内容
     
149. }
     
150. private synchronized void saveLog(String s) {
     
151. BufferedWriter writer = null;
     
152. try {
     
153. writer = new BufferedWriter(new FileWriter("C:\\Program Files\\jilu", true)); // true表示向文件追加
     
154. writer.write(s);
     
155. } catch (IOException e) {
     
156. e.printStackTrace();
     
157. } finally {
     
158. if (writer != null)
     
159. try {
     
160. writer.close();
     
161. } catch (IOException e) {
     
162. e.printStackTrace();
     
163. }
     
164. }
     
165. }
     
166. private String getTime() {
     
167. TimeZone.setDefault(TimeZone.getDefault());
     
168. SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
     
169. return format.format(new Date());
     
170. }
     
171. private void sendMsg(String ip, String content) {
     
172. DatagramSocket socket = null;
     
173. try {
     
174. socket = new DatagramSocket();
     
175. byte[] b = content.getBytes();
     
176. if(b.length==0){
     
177. Dialog dia=createDialog();
     
178. dia.setVisible(true);
     
179. }
     
180. DatagramPacket packet = new DatagramPacket(b, b.length, InetAddress.getByName(ip), 8888);
     
181. socket.send(packet);
     
182. } catch (IOException e) {
     
183. e.printStackTrace();
     
184. } finally {
     
185. if (socket != null)
     
186. socket.close();
     
187. }
     
188. }
     
189. private Dialog createDialog() {
     
190. dia = new Dialog(frame,"消息提示",true);
     
191. dia.setBackground(Color.GREEN);
     
192. b = new Button("确定");
     
193. b.setBackground(Color.BLUE);
     
194. lb = new Label(" 不 能 输 入 空 消 息 ");
     
195. dia.add(lb);
     
196. dia.setBounds(300, 250, 300, 200);
     
197. dia.setLayout(new FlowLayout());
     
198. dia.add(b);
     
199. b.addActionListener(new ActionListener(){
     
200. public void actionPerformed(ActionEvent e) {
     
201. dia.dispose();
     
202. }
     
203. });
     
204. dia.addWindowListener(new WindowAdapter(){
     
205. public void windowClosing(WindowEvent e){
     
206. dia.dispose();
     
207. }
     
208. });
     
209. return dia;
     
210. }
     
211. private Frame createFrame() {
     
212. Frame frame = new Frame("华东---------模拟聊天室");
     
213. frame.setSize(500, 600);
     
214. frame.setLocation(300, 100);
     
215. frame.setIconImage(Toolkit.getDefaultToolkit().createImage("G:\\DCIM\\.thumbnails\\1335314618830.jpg"));
     
216. frame.addWindowListener(new WindowAdapter() {
     
217. public void windowClosing(WindowEvent e) {
     
218. e.getWindow().dispose();
     
219. }
     
220. });
     
221. return frame;
     
222. }
     
223. public static void main(String[] args) {
     
224. new GuiChat();
     
225. }
     
226. 
     
227. }

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