Java Examples - ServerSocket and Socket communications examples
The following example demonstrates how to implement a client sends a message to the server, the server receives the message and read the output, then write to the client the client receives the output.
1, to establish the server
- ServerSocket server to establish communications
- Socket receiving client server to establish the connection
- Establish a data input stream to read IO sent by the client
- Establishment of IO down to the client to send data messages
Server-side code:
import java.io.BufferedReader; import java.io.BufferedWriter; import java.io.IOException; import java.io.InputStreamReader; import java.io.OutputStreamWriter; import java.net.ServerSocket; import java.net.Socket; public class Server { public static void main(String[] args) { try { ServerSocket ss = new ServerSocket(8888); System.out.println("启动服务器...."); Socket s = ss.accept(); System.out.println("客户端:"+s.getInetAddress().getLocalHost()+"已连接到服务器"); BufferedReader br = new BufferedReader(new InputStreamReader(s.getInputStream())); //读取客户端发送来的消息 String mess = br.readLine(); System.out.println("客户端:"+mess); BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(s.getOutputStream())); bw.write(mess+"\n"); bw.flush(); } catch (IOException e) { e.printStackTrace(); } } }
The above code is run output is:
启动服务器....
2, the establishment of the client
- Create Socket Communications, set the communications server IP and Port
- Establish IO output data flow server sends a message
- Establish IO input stream to read the data message sent by the server
Client code:
/* author by w3cschool.cc Main.java */ import java.io.BufferedReader; import java.io.BufferedWriter; import java.io.IOException; import java.io.InputStream; import java.io.InputStreamReader; import java.io.OutputStream; import java.io.OutputStreamWriter; import java.net.Socket; import java.net.UnknownHostException; public class Client { public static void main(String[] args) { try { Socket s = new Socket("127.0.0.1",8888); //构建IO InputStream is = s.getInputStream(); OutputStream os = s.getOutputStream(); BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(os)); //向服务器端发送一条消息 bw.write("测试客户端和服务器通信,服务器接收到消息返回到客户端\n"); bw.flush(); //读取服务器返回的消息 BufferedReader br = new BufferedReader(new InputStreamReader(is)); String mess = br.readLine(); System.out.println("服务器:"+mess); } catch (UnknownHostException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } } }
The above code is run output is:
服务器:测试客户端和服务器通信,服务器接收到消息返回到客户端