入门案例

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.ServerSocket;
import java.net.Socket;
public class BasicSocketServer {
    public static void main(String[] args) {
        Socket socket = null;
        BufferedReader bufferedReader = null;
        try{
            ServerSocket serverSocket = new ServerSocket(8888);
            System.out.println("服务器启动监听，等待连接。。。。");
            //开启端口监听
            socket = serverSocket.accept();
            //读取客户端发送的信息
            bufferedReader=new BufferedReader(new InputStreamReader(socket.getInputStream()));
            System.out.println(bufferedReader.readLine());
        }catch(Exception e){
            e.printStackTrace();
        }finally{
            if(bufferedReader!=null){
                try{
                    bufferedReader.close();
                }catch (Exception e){
                    e.printStackTrace();
                }
            }
            if(socket != null){
                try{
                    socket.close();
                }catch (Exception e){
                    e.printStackTrace();
                }
            }
        }
    }
}

import java.io.IOException;
import java.io.PrintWriter;
import java.net.Socket;

public class BasicSocketClient {
    public static void main(String[] args) {
        Socket socket = null;
        PrintWriter printWriter = null;
        try{
            //创建socket对象，两个参数：1、服务端IP地址  2、服务端所监听的端口
            socket=new Socket("127.0.0.1",8888);
            printWriter=new PrintWriter(socket.getOutputStream());
            printWriter.println("你好，服务器");
            printWriter.flush();
        }catch (Exception e){
            e.printStackTrace();
        }finally {
            if(printWriter != null){
                printWriter.close();
            }
            if(socket != null){
                try {
                    socket.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }
}