Java Socket 编程——多线程网络聊天程序

一时失言乱红尘 2022-08-24 00:52 251阅读 0赞

首先，进行服务端的编程，作为服务端，编程主要按下面几个步骤进行：

// 1. 创建socket  
ServerSocket ss = new ServerSocket(PortNumber);  
Socket s = ss.accept(); //监听器，产生阻塞，直到有连接才停止阻塞。

// 2. 打开输入流、输出流  
OutputStream os = s.getOutputStream();  
BufferedOutputStream bos = new BufferedOutputStream(os);  
InputStream is = s.getInputStream();

// 3. 根据一定的[协议][Link 1]读写数据  
// [服务器][Link 2] \--> 客户  
//os.write("Hello,I am Server!".getBytes());  
bos.write("Hello,I am Server!".getBytes());  
bos.flush(); //注意!!

// [服务器][Link 2] <-- 客户  
byte\[\] buf = new byte\[100\];  
int len = is.read(buf);  
System.out.println(new String(buf, 0, len));

// 4. 关系流和Socket  
//os.close();  
bos.close();  
is.close();  
s.close();  
ss.close();

作为客户端则分为下面几个步骤，其实和服务端差不多，只是少了用ServerSocket进行监听。

// 1. 创建socket  
Socket s = new Socket(InetAddress.getByName("localhost"),  
PortNumber);  
// 2. 打开输入流、输出流  
OutputStream os = s.getOutputStream();  
InputStream is = s.getInputStream();

// 3. 根据一定的[协议][Link 1]读写数据  
// 服务器 --> 客户  
byte\[\] buf = new byte\[100\];  
int len = is.read(buf);  
System.out.println(new String(buf, 0, len));  
// 服务器 <-- 客户  
os.write("Hello,I am Client!".getBytes());

// 4. 关系流和Socket  
os.close();  
is.close();  
s.close();

上面这些只是一个单线程的服务端->客户端的程序，只能进行一次通讯，多次通讯将被告知无法连接。

这时，我们就需要用到进程Thread进行编程，将其改造成多线程聊天程序，可以同时进行多客户端的连接与发送信息。

代码如下：

1 ![None.gif][]  // Server.java   
  2 ![None.gif][]   
  3 ![None.gif][] import  java.awt. \* ;  
  4 ![None.gif][] import  java.net. \* ;  
  5 ![None.gif][] import  java.io. \* ;  
  6 ![None.gif][]  
  7 ![ExpandedBlockStart.gif][]![ContractedBlock.gif][] public  class  Server  extends  Thread  ![dot.gif][] \{  
 8![InBlock.gif][] ServerSocket skt;  
 9![InBlock.gif][]  
 10![InBlock.gif][] Socket Client\[\]=new Socket\[10\];;  
 11![InBlock.gif][] Socket Client1=null;  
 12![InBlock.gif][]  
 13![InBlock.gif][]int i =0;  
 14![InBlock.gif][]  
 15![InBlock.gif][] TextArea in;  
 16![InBlock.gif][]  
 17![InBlock.gif][]int port,k=0,l=0;  
 18![InBlock.gif][]  
 19![InBlock.gif][]//BufferedReader theInputStream;  
 20![InBlock.gif][]  
 21![InBlock.gif][] PrintStream theOutputStream;  
 22![InBlock.gif][]  
 23![InBlock.gif][]//String readin;  
 24![InBlock.gif][]  
 25![InBlock.gif][] Face chat;  
 26![InBlock.gif][]  
 27![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]public Server(int port, Face chat) ![dot.gif][]\{  
 28![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]try![dot.gif][]\{  
 29![InBlock.gif][]this.port = port;  
 30![InBlock.gif][] skt =new ServerSocket(port);  
 31![InBlock.gif][]this.chat = chat;  
 32![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][] \}catch (IOException e) ![dot.gif][]\{  
 33![InBlock.gif][] chat.ta.append(e.toString());  
 34![ExpandedSubBlockEnd.gif][] \}  
 35![ExpandedSubBlockEnd.gif][] \}  
 36![InBlock.gif][]  
 37![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]publicvoid run() ![dot.gif][]\{  
 38![InBlock.gif][]  
 39![InBlock.gif][] chat.ta.append("等待连线![dot.gif][]![dot.gif][]");  
 40![InBlock.gif][]  
 41![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]while (true) ![dot.gif][]\{  
 42![InBlock.gif][]//System.out.print(""+i+"/n");  
 43![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]try![dot.gif][]\{  
 44![InBlock.gif][]  
 45![InBlock.gif][]  
 46![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][] Client\[k\] = skt.accept(); /\*\*//\* 接收客户连接 \*/  
 47![InBlock.gif][]  
 48![InBlock.gif][]//当有客户端连接时就新建一个子线程  
 49![InBlock.gif][]  
 50![InBlock.gif][]  
 51![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]if (i <2) ![dot.gif][]\{  
 52![InBlock.gif][] ServerThread server\[\] =new ServerThread\[10\];  
 53![InBlock.gif][] server\[k\]=new ServerThread(Client\[k\], this.chat, i);  
 54![InBlock.gif][] l=server.length;  
 55![InBlock.gif][] server\[k\].start();  
 56![InBlock.gif][] chat.ta.append("客户端"\+ Client\[k\].getInetAddress() \+"已连线/n");  
 57![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]/\*\*//\*theInputStream = new BufferedReader(new InputStreamReader(Client  
 58![ExpandedSubBlockEnd.gif][] .getInputStream()));\*/  
 59![InBlock.gif][]//for(int j=0;j<server.length;j++)  
 60![InBlock.gif][] theOutputStream =new PrintStream(server\[k\].getClient().getOutputStream());  
 61![InBlock.gif][] i = server\[k\].getI();  
 62![InBlock.gif][] k\++;  
 63![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][] \}else![dot.gif][]\{  
 64![InBlock.gif][]//theOutputStream = new PrintStream(null);  
 65![ExpandedSubBlockEnd.gif][] \}  
 66![InBlock.gif][]  
 67![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][] \}catch (SocketException e) ![dot.gif][]\{  
 68![InBlock.gif][]//chat.ta.append("连线中断！/n");  
 69![InBlock.gif][]  
 70![InBlock.gif][]//chat.clientBtn.setEnabled(true);  
 71![InBlock.gif][]//chat.serverBtn.setEnabled(true);  
 72![InBlock.gif][]//chat.tfaddress.setEnabled(true);  
 73![InBlock.gif][]//chat.tfport.setEnabled(true);  
 74![InBlock.gif][]//try \{  
 75![InBlock.gif][]  
 76![InBlock.gif][]//skt.close();  
 77![InBlock.gif][]//Client.close();  
 78![InBlock.gif][]//\} catch (IOException err) \{  
 79![InBlock.gif][]// chat.ta.append(err.toString());  
 80![InBlock.gif][]//\}  
 81![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][] \}catch (IOException e) ![dot.gif][]\{  
 82![InBlock.gif][] chat.ta.append(e.toString());  
 83![ExpandedSubBlockEnd.gif][] \}  
 84![ExpandedSubBlockEnd.gif][] \}  
 85![InBlock.gif][]  
 86![ExpandedSubBlockEnd.gif][] \}  
 87![InBlock.gif][]  
 88![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]publicvoid dataout(String data) ![dot.gif][]\{  
 89![InBlock.gif][]//for(int j=0;j<l;j++)  
 90![InBlock.gif][] theOutputStream.println(data);  
 91![ExpandedSubBlockEnd.gif][] \}  
 92![ExpandedBlockEnd.gif][] \}   
  93 ![None.gif][]  
  94 ![ExpandedBlockStart.gif][]![ContractedBlock.gif][] class  ServerThread  extends  Thread  ![dot.gif][] \{  
 95![InBlock.gif][] ServerSocket skt;  
 96![InBlock.gif][]  
 97![InBlock.gif][] Socket Client;  
 98![InBlock.gif][]  
 99![InBlock.gif][] TextArea in;  
100![InBlock.gif][]  
101![InBlock.gif][]int port;  
102![InBlock.gif][]  
103![InBlock.gif][]int i;  
104![InBlock.gif][]  
105![InBlock.gif][] BufferedReader theInputStream;  
106![InBlock.gif][]  
107![InBlock.gif][] PrintStream theOutputStream;  
108![InBlock.gif][]  
109![InBlock.gif][] String readin;  
110![InBlock.gif][]  
111![InBlock.gif][] Face chat;  
112![InBlock.gif][]  
113![InBlock.gif][]//服务端子线程   
114![InBlock.gif][]  
115![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]public ServerThread(Socket s, Face chat, int i) ![dot.gif][]\{  
116![InBlock.gif][]this.i =\++i;  
117![InBlock.gif][] Client = s;  
118![InBlock.gif][]//this.port = port;  
119![InBlock.gif][]//skt = new ServerSocket(port);  
120![InBlock.gif][]this.chat = chat;  
121![InBlock.gif][]  
122![ExpandedSubBlockEnd.gif][] \}  
123![InBlock.gif][]  
124![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]publicint getI() ![dot.gif][]\{  
125![InBlock.gif][]returnthis.i;  
126![ExpandedSubBlockEnd.gif][] \}  
127![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]public Socket getClient() ![dot.gif][]\{  
128![InBlock.gif][]returnthis.Client;  
129![ExpandedSubBlockEnd.gif][] \}  
130![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]publicvoid run() ![dot.gif][]\{  
131![InBlock.gif][]  
132![InBlock.gif][]//chat.ta.append("等待连线![dot.gif][]![dot.gif][]");  
133![InBlock.gif][]  
134![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]try![dot.gif][]\{  
135![InBlock.gif][]//Client = skt.accept(); /\* 接收客户连接 \*/  
136![InBlock.gif][]  
137![InBlock.gif][]//chat.ta.append("客户端" + Client.getInetAddress() + "已连线/n");  
138![InBlock.gif][] theInputStream =new BufferedReader(new InputStreamReader(Client  
139![InBlock.gif][] .getInputStream()));  
140![InBlock.gif][] theOutputStream =new PrintStream(Client.getOutputStream());  
141![InBlock.gif][]  
142![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]while (true) ![dot.gif][]\{  
143![InBlock.gif][] readin = theInputStream.readLine();  
144![InBlock.gif][] chat.ta.append(readin \+"/n");  
145![ExpandedSubBlockEnd.gif][] \}  
146![InBlock.gif][]  
147![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][] \}catch (SocketException e) ![dot.gif][]\{  
148![InBlock.gif][] chat.ta.append("连线中断！/n");  
149![InBlock.gif][]  
150![InBlock.gif][] chat.clientBtn.setEnabled(true);  
151![InBlock.gif][] chat.serverBtn.setEnabled(true);  
152![InBlock.gif][] chat.tfaddress.setEnabled(true);  
153![InBlock.gif][] chat.tfport.setEnabled(true);  
154![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]try![dot.gif][]\{  
155![InBlock.gif][] i\--;  
156![InBlock.gif][] skt.close();  
157![InBlock.gif][] Client.close();  
158![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][] \}catch (IOException err) ![dot.gif][]\{  
159![InBlock.gif][] chat.ta.append(err.toString());  
160![ExpandedSubBlockEnd.gif][] \}  
161![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][] \}catch (IOException e) ![dot.gif][]\{  
162![InBlock.gif][] chat.ta.append(e.toString());  
163![ExpandedSubBlockEnd.gif][] \}  
164![ExpandedSubBlockEnd.gif][] \}  
165![InBlock.gif][]  
166![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]publicvoid dataout(String data) ![dot.gif][]\{  
167![InBlock.gif][] theOutputStream.println(data);  
168![ExpandedSubBlockEnd.gif][] \}  
169![ExpandedBlockEnd.gif][] \}   
 170 ![None.gif][]  
 171 ![None.gif][] // Client.java   
 172 ![None.gif][]   
 173 ![None.gif][] import  java.net. \* ;  
 174 ![None.gif][] import  java.io. \* ;  
 175 ![None.gif][] import  javax.swing.Timer;  
 176 ![ExpandedBlockStart.gif][]![ContractedBlock.gif][] class  Client  extends  Thread  ![dot.gif][] \{  
177![InBlock.gif][] Socket skt;  
178![InBlock.gif][] InetAddress host;  
179![InBlock.gif][]int port;  
180![InBlock.gif][]  
181![InBlock.gif][] BufferedReader theInputStream;  
182![InBlock.gif][] PrintStream theOutputStream;  
183![InBlock.gif][] String readin;  
184![InBlock.gif][]  
185![InBlock.gif][] Face chat;  
186![InBlock.gif][]  
187![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]public Client(String ip, int p, Face chat) ![dot.gif][]\{  
188![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]try![dot.gif][]\{  
189![InBlock.gif][] host = InetAddress.getByName(ip);  
190![InBlock.gif][] port = p;  
191![InBlock.gif][]this.chat = chat;  
192![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][] \}catch (IOException e) ![dot.gif][]\{  
193![InBlock.gif][] chat.ta.append(e.toString());  
194![ExpandedSubBlockEnd.gif][] \}  
195![ExpandedSubBlockEnd.gif][] \}  
196![InBlock.gif][]  
197![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]publicvoid run() ![dot.gif][]\{  
198![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]try![dot.gif][]\{  
199![InBlock.gif][] chat.ta.append("尝试连线![dot.gif][]![dot.gif][]");  
200![InBlock.gif][]  
201![InBlock.gif][] skt =new Socket(host, port);  
202![InBlock.gif][] chat.ta.append("连线成功/n");  
203![InBlock.gif][]  
204![InBlock.gif][] theInputStream =new BufferedReader(new InputStreamReader(skt  
205![InBlock.gif][] .getInputStream()));  
206![InBlock.gif][]  
207![InBlock.gif][] theOutputStream =new PrintStream(skt.getOutputStream());  
208![InBlock.gif][]//Timer myTimer = new Timer();  
209![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]while (true) ![dot.gif][]\{  
210![InBlock.gif][] readin = theInputStream.readLine();  
211![InBlock.gif][] chat.ta.append(readin \+"/n");  
212![ExpandedSubBlockEnd.gif][] \}  
213![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][] \}catch (SocketException e) ![dot.gif][]\{  
214![InBlock.gif][] chat.ta.append("连线中断！/n");  
215![InBlock.gif][] chat.clientBtn.setEnabled(true);  
216![InBlock.gif][] chat.serverBtn.setEnabled(true);  
217![InBlock.gif][] chat.tfaddress.setEnabled(true);  
218![InBlock.gif][] chat.tfport.setEnabled(true);  
219![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]try![dot.gif][]\{  
220![InBlock.gif][] skt.close();  
221![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][] \}catch (IOException err) ![dot.gif][]\{  
222![InBlock.gif][] chat.ta.append(err.toString());  
223![ExpandedSubBlockEnd.gif][] \}  
224![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][] \}catch (IOException e) ![dot.gif][]\{  
225![InBlock.gif][] chat.ta.append(e.toString());  
226![ExpandedSubBlockEnd.gif][] \}  
227![ExpandedSubBlockEnd.gif][] \}  
228![InBlock.gif][]  
229![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]publicvoid dataout(String data) ![dot.gif][]\{  
230![InBlock.gif][] theOutputStream.println(data);  
231![ExpandedSubBlockEnd.gif][] \}  
232![ExpandedBlockEnd.gif][] \}   
 233 ![None.gif][]  
 234 ![None.gif][] // 软件界面，进行按键监听调用。  
 235 ![None.gif][] // face.java   
 236 ![None.gif][]   
 237 ![None.gif][] import  java.awt. \* ;  
 238 ![None.gif][] import  java.awt.event. \* ;  
 239 ![None.gif][]  
 240 ![ExpandedBlockStart.gif][]![ContractedBlock.gif][] public  class  Face  extends  Frame  ![dot.gif][] \{  
241![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]/\*\* \*//\*\*  
242![InBlock.gif][] \*  
243![ExpandedSubBlockEnd.gif][]\*/  
244![InBlock.gif][]privatestaticfinallong serialVersionUID =1L;  
245![InBlock.gif][] Button clientBtn, serverBtn;  
246![InBlock.gif][] TextArea ta;  
247![InBlock.gif][] TextField tfaddress, tfport, tftype;  
248![InBlock.gif][]int port;  
249![InBlock.gif][] Client client;  
250![InBlock.gif][] Server server;  
251![InBlock.gif][]boolean iamserver;  
252![InBlock.gif][]static Face frm;  
253![InBlock.gif][]  
254![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]public Face() ![dot.gif][]\{  
255![InBlock.gif][] clientBtn =new Button("客户端");  
256![InBlock.gif][] serverBtn =new Button("服务器");  
257![InBlock.gif][] ta =new TextArea("", 10, 50, TextArea.SCROLLBARS\_BOTH);  
258![InBlock.gif][] tfaddress =new TextField("192.168.1.104", 20);  
259![InBlock.gif][] tfport =new TextField("2000");  
260![InBlock.gif][] tftype =new TextField(50);  
261![InBlock.gif][]  
262![InBlock.gif][] tftype.addKeyListener(new TFListener());  
263![InBlock.gif][] ta.setEditable(false);  
264![InBlock.gif][]  
265![InBlock.gif][] setLayout(new FlowLayout());  
266![InBlock.gif][] add(tfaddress);  
267![InBlock.gif][] add(tfport);  
268![InBlock.gif][] add(clientBtn);  
269![InBlock.gif][] add(serverBtn);  
270![InBlock.gif][] add(ta);  
271![InBlock.gif][] add(tftype);  
272![InBlock.gif][] setSize(400, 300);  
273![InBlock.gif][] setTitle("我的聊天室");  
274![InBlock.gif][]this.setVisible(true);  
275![InBlock.gif][]  
276![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][] clientBtn.addActionListener(new ActionListener() ![dot.gif][]\{  
277![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]publicvoid actionPerformed(ActionEvent e) ![dot.gif][]\{  
278![InBlock.gif][]  
279![InBlock.gif][] port = Integer.parseInt(tfport.getText());  
280![InBlock.gif][]  
281![InBlock.gif][] client =new Client(tfaddress.getText(), port, frm);  
282![InBlock.gif][]  
283![InBlock.gif][] client.start();  
284![InBlock.gif][]  
285![InBlock.gif][] tfaddress.setEnabled(false);  
286![InBlock.gif][] tfport.setEnabled(false);  
287![InBlock.gif][] serverBtn.setEnabled(false);  
288![InBlock.gif][] clientBtn.setEnabled(false);  
289![ExpandedSubBlockEnd.gif][] \}  
290![ExpandedSubBlockEnd.gif][] \});  
291![InBlock.gif][]  
292![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][] serverBtn.addActionListener(new ActionListener() ![dot.gif][]\{  
293![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]publicvoid actionPerformed(ActionEvent e) ![dot.gif][]\{  
294![InBlock.gif][]  
295![InBlock.gif][] port = Integer.parseInt(tfport.getText());  
296![InBlock.gif][]  
297![InBlock.gif][] server =new Server(port, frm);  
298![InBlock.gif][]  
299![InBlock.gif][] server.start();  
300![InBlock.gif][]  
301![InBlock.gif][] iamserver =true;  
302![InBlock.gif][] tfaddress.setText("成为服务器");  
303![InBlock.gif][]  
304![InBlock.gif][] tfaddress.setEnabled(false);  
305![InBlock.gif][] tfport.setEnabled(false);  
306![InBlock.gif][] serverBtn.setEnabled(false);  
307![InBlock.gif][] clientBtn.setEnabled(false);  
308![ExpandedSubBlockEnd.gif][] \}  
309![ExpandedSubBlockEnd.gif][] \});  
310![InBlock.gif][]  
311![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][] addWindowListener(new WindowAdapter() ![dot.gif][]\{  
312![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]publicvoid windowClosing(WindowEvent e) ![dot.gif][]\{  
313![InBlock.gif][] System.exit(0);  
314![ExpandedSubBlockEnd.gif][] \}  
315![ExpandedSubBlockEnd.gif][] \});  
316![InBlock.gif][]  
317![ExpandedSubBlockEnd.gif][] \}  
318![InBlock.gif][]  
319![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]publicstaticvoid main(String args\[\]) ![dot.gif][]\{  
320![InBlock.gif][] frm =new Face();  
321![ExpandedSubBlockEnd.gif][] \}  
322![InBlock.gif][]  
323![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]privateclass TFListener implements KeyListener ![dot.gif][]\{  
324![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]publicvoid keyPressed(KeyEvent e) ![dot.gif][]\{  
325![InBlock.gif][]  
326![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]if (e.getKeyCode() == KeyEvent.VK\_ENTER) ![dot.gif][]\{  
327![InBlock.gif][]  
328![InBlock.gif][] ta.append(">"\+ tftype.getText() \+"/n");  
329![InBlock.gif][]  
330![InBlock.gif][]if (iamserver)  
331![InBlock.gif][] server.dataout(tftype.getText());  
332![InBlock.gif][]else  
333![InBlock.gif][] client.dataout(tftype.getText());  
334![InBlock.gif][]  
335![InBlock.gif][] tftype.setText("");  
336![ExpandedSubBlockEnd.gif][] \}  
337![ExpandedSubBlockEnd.gif][] \}  
338![InBlock.gif][]  
339![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]publicvoid keyTyped(KeyEvent e) ![dot.gif][]\{  
340![ExpandedSubBlockEnd.gif][] \}  
341![InBlock.gif][]  
342![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]publicvoid keyReleased(KeyEvent e) ![dot.gif][]\{  
343![ExpandedSubBlockEnd.gif][] \}  
344![ExpandedSubBlockEnd.gif][] \}  
345![InBlock.gif][]

[Link 1]: http://cisco.chinaitlab.com/List_11.html
[Link 2]: http://server.chinaitlab.com/
[None.gif]: /images/20220823/a2bea64567054d81b15832078e0c71f8.png
[ExpandedBlockStart.gif]: http://www.cnitblog.com/Images/OutliningIndicators/ExpandedBlockStart.gif
[ContractedBlock.gif]: http://www.cnitblog.com/Images/OutliningIndicators/ContractedBlock.gif
[dot.gif]: /images/20220823/f7bdd0d18923498b8bed13b374ef229f.png
[InBlock.gif]: /images/20220823/8619a10c22a3438daac6927ca5f5596d.png
[ExpandedSubBlockStart.gif]: http://www.cnitblog.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif
[ContractedSubBlock.gif]: /images/20220823/a2703db76e2f45a48e6265865418fce4.png
[ExpandedSubBlockEnd.gif]: /images/20220823/c2b099de8f0d463cb60a18665c31322d.png
[ExpandedBlockEnd.gif]: /images/20220823/eaeb712e81234c2fadc65685ea10a6b0.png