【Java】简易Socket连接实现

客户端：

import java.io.*;
import java.net.Socket;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Scanner;
/**
 * 客户端
 * */
public class SocketClient {
    Socket socket;
    String address="127.0.0.1";
    int portNumber=4775;
    PrintWriter printWriter;
    BufferedReader bufferedReader;
    public SocketClient(){
        try {
            socket=new Socket(address,portNumber);
            bufferedReader=new BufferedReader(new InputStreamReader(socket.getInputStream()));
            printWriter=new PrintWriter(socket.getOutputStream());
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
    public void chat(){
        System.out.println("请输入要发送的信息：");
        Scanner scanner=new Scanner(System.in);
        String str="";
        while(true){
            str=scanner.nextLine();
                printWriter.println(str);
                printWriter.flush();
                System.out.println(getCurTime()+"客户端："+str);
                if(str.equals("bye")){
                    break;
                }
            String server_str= null;
            try {
                server_str = bufferedReader.readLine();
                System.out.println(getCurTime()+"服务器："+server_str);
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        scanner.close();
        close();
    }
    public static String getCurTime(){
        Date date=new Date();
        SimpleDateFormat simpleDateFormat=new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        return simpleDateFormat.format(date);
    }
    public void close(){
        try {
            printWriter.close();
            bufferedReader.close();
            socket.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    public static void main(String[] args) {
        SocketClient socketClient=new SocketClient();
        socketClient.chat();
    }
}

服务端：

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.ServerSocket;
import java.net.Socket;
/**
 * 服务器端
 * */
public class SocketServer {
    private int server_port=4775;
    private ServerSocket serverSocket;
    PrintWriter printWriter;
    BufferedReader bufferedReader;
    Socket socket;
    public SocketServer(){
        try {
            serverSocket=new ServerSocket(server_port);
            System.out.println("服务器已启动！");
            socket=serverSocket.accept();
            System.out.println("有用户接入了！");
            printWriter=new PrintWriter(socket.getOutputStream());
            bufferedReader=new BufferedReader(new InputStreamReader(socket.getInputStream()));
            while (true){
                String str=bufferedReader.readLine();
                System.out.println("客户端："+str);
                if(str.equals("bye")){
                    break;
                }
                printWriter.println(str);
                printWriter.flush();
                System.out.println("发送数据给客户端~");
            }
        } catch (IOException e) {
            e.printStackTrace();
        }finally {
            try {
                printWriter.close();
                bufferedReader.close();
                socket.close();
            } catch (IOException e) {
                e.printStackTrace();
            }

        }
    }

    public static void main(String[] args) {
        new SocketServer();
    }
}