1 //查询本机地址
2 InetAddress ip1 = InetAddress.getByName("127.0.0.1");
3 InetAddress ip2 = InetAddress.getByName("loaclhost");
4 InetAddress ip3 = InetAddress.getLocalHost();
5 ?
6 //查询网站地址
7 InetAddress ip4 = InetAddress.getByName("www.baiu.com");
8 //四个get方法
9 ip4.getHostAddress();

1 #查看所有端口
2 netstat -ano
3 #查看具体端口
4 netstat -ano|findstr "5900"
5 #查看具体端口的进程
6 tasklist|finstr "8696"

1 InetSocketAddress port1 = new InetSocketAddress("127.0.0.1",8080);
2 InetSocketAddress port2 = new InetSocketAddress("localhost");
3 ?
4 port1.getAddress();
5 port1.getHostName();
6 port1.getPort();

 1 至少三次才能保证稳定链接
 2 A：你瞅啥？
 3 B：瞅你咋地？
 4 A：干一场？！
 5 ?
 6 ?
 7 A：我要走了！
 8 B：你真的要走了吗？
 9 B：你真的真要走了吗？
10 A：我真的要走了！

1 Socket socket = new Socket(InetAddress.getByName("127.0.0.1"), 9999);

1 OutputStream os = socket.getOutputStream();

1 FileInputStream fis = new FileInputStream(new File("name.file"));

1 byte[] buffer = new byte[1024];
2 int len;
3 while ((len = fis.read(buffer)) != -1)
4 {
5     os.write(buffer,0,len);
6 }

1 socket.shutdownOutput();

 1 InputStream is = socket.getInputStream();
 2 ByteArrayOutputStream baos = new ByteArrayOutputStream();
 3 byte[] buffer2 = new byte[1024];
 4 int len2;
 5 while ((len2 = is.read(buffer2)) != -1)
 6 {
 7     baos.write(buffer2,0,len2);
 8 }
 9 System.out.println(baos.toString());
10 ?
11 baos.close();
12 is.close();
13 fis.close();
14 os.close();
15 socket.close();

1 ServerSocket serverSocket = new ServerSocket(9999);

1 Socket socket = serverSocket.accept();

1 InputStream is = socket.getInputStream();

1 FileOutputStream fos = new FileOutputStream(new File("Receive.png"));
2 byte[] buffer = new byte[1024];
3 int len;
4 while ((len = is.read(buffer)) != -1)
5 {
6     fos.write(buffer,0,len);
7 }

1 OutputStream os = socket.getOutputStream();
2 os.write("接收完毕,可关闭连接.".getBytes());
3 ?
4 os.close();
5 fos.close();
6 is.close();
7 socket.close();
8 serverSocket.close();

 1 //建立Socket
 2 DatagramSocket socket = new DatagramSocket();
 3 ?
 4 //获取控制台输入内容
 5 BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
 6 //循环输入
 7 while (true)
 8 {
 9     String data = reader.readLine();
10     byte[] datas =  data.getBytes();
11     int port = 6666;
12     //建立包
13     DatagramPacket packet = new DatagramPacket(datas,0,datas.length,new InetSocketAddress("127.0.0.1",port));
14     //发送包
15     socket.send(packet);
16     //断开连接条件
17     if (data.equals("bye"))
18     {
19         break;
20     }
21 }
22 //关闭资源
23 socket.close();

 1 //开放端口
 2 DatagramSocket socket = new DatagramSocket(6666);
 3 //循环接收
 4 while (true)
 5 {
 6     //准备接收packet
 7     byte[] container = new byte[1024];
 8     DatagramPacket packet = new DatagramPacket(container,0,container.length);
 9     socket.receive(packet);
10 
11     //写出包
12     byte[] datas = packet.getData();
13     String ReceiveData = new String(datas,0,datas.length);
14     System.out.println(ReceiveData);
15 
16     //断开连接条件
17     if (ReceiveData.equals("bye"))
18     {
19         break;
20     }
21 }
22 //断开资源
23 socket.close();