Socket

服务端
import java.io.BufferedReader;
import java.io.DataOutputStream;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.net.ServerSocket;
import java.net.Socket;


public class Server {


public static void main(String[] args) throws Exception {
ServerSocket server = new ServerSocket(8888);

// 等待客户端的连接
while(true){
Socket client = server.accept();

InputStream in = client.getInputStream();
OutputStream out = client.getOutputStream();

BufferedReader br = new BufferedReader(new InputStreamReader(in));
System.out.println(br.readLine());

DataOutputStream dos = new DataOutputStream(out);
dos.writeUTF("java");
}
}

}

客户端

import java.io.BufferedReader;
import java.io.DataOutputStream;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.net.Socket;


public class Client {


public static void main(String[] args) throws Exception {
Socket client = new Socket("localhost",8888);

InputStream in = client.getInputStream();
OutputStream out = client.getOutputStream();

DataOutputStream dos = new DataOutputStream(out);
dos.writeUTF("hello world");

BufferedReader br = new BufferedReader(new InputStreamReader(in));
System.out.println(br.readLine());

dos.close();
}
}