【Socket網絡編程進階與實戰】------ Socket網絡編程快速入門

前言

本篇博客主要是分享，socket網絡編程進階與實踐☞socket網絡編程快速入門

一、聊一聊Socket

學習目標與收穫

案例

網絡編程

歸納爲：
對應關係

二、Socket與TCP、UDP

TCP

UDP

Client-Server Application

三、Socket TCP牛刀小試-客戶端實現

構建TCP客戶端，服務端
客戶端發送數據
服務器讀取數據並打印

client

package com.zcw.demo;


import java.io.*;
import java.net.*;

/**
 * @ClassName : Client
 * @Description :
 * @Author : Zhaocunwei
 * @Date: 2020-07-07 10:09
 */
public class Client {
    public static void main(String[] args) throws IOException {
      //初始化socket
        Socket socket = new Socket();
        //設置超時時間
        socket.setSoTimeout(3000);
        //設置連接的超時時間與連接的端口號
        socket.connect(new InetSocketAddress(Inet4Address.getLocalHost(),2000),3000);
        System.out.println("已發起服務器連接，並進入後續流程");
        System.out.println("客戶端信息："+socket.getLocalAddress()+"P:"+socket.getLocalPort());
        System.out.println("服務器信息："+socket.getInetAddress()+"P:"+socket.getPort());

        try{
            //發送接收數據
            todo(socket);
        }catch(Exception e){
            System.out.println("異常關閉");
        }
        //釋放資源
        socket.close();
        System.out.println("客戶端已退出");

    }
    //發送數據
    private static void todo(Socket client) throws IOException{
            //構建鍵盤輸入流
            InputStream in = System.in;
            BufferedReader input = new BufferedReader(new InputStreamReader(in));

            //客戶端輸出流(得到Socket輸出流，並轉換爲打印流)
          OutputStream outputStream = client.getOutputStream();
          PrintStream  socketPrintStream = new PrintStream(outputStream);

          //得到Socket輸入流,並轉換爲BufferedReader
        InputStream inputStream = client.getInputStream();
        BufferedReader socketBufferedReader = new BufferedReader(new InputStreamReader(inputStream));

        boolean flag = true;
        do{
            //從鍵盤讀取一行
            String str= input.readLine();
            //然後把讀取的這一行，發送出去，到服務器
            socketPrintStream.println(str);

            //從服務器讀取一行
            String echo = socketBufferedReader.readLine();
            if("bye".equalsIgnoreCase(echo)){
                flag = false;
            }else{
                System.out.println(echo);
            }
        }while (flag);

        //資源釋放
        socketPrintStream.close();
        socketBufferedReader.close();
    }

}

server

package com.zcw.demo;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintStream;
import java.net.ServerSocket;
import java.net.Socket;

/**
 * @ClassName : Server
 * @Description :
 * @Author : Zhaocunwei
 * @Date: 2020-07-07 10:08
 */
public class Server {

    public static void main(String[] args) throws IOException {
        ServerSocket server = new ServerSocket(2000);
        System.out.println("服務器準備就緒");
        System.out.println("服務器信息："+server.getInetAddress()+"p:"+server.getLocalPort());

        //等待客戶端連接
        for(;;){
            //得到客戶端
            Socket client = server.accept();
            //客戶端構建異步線程
            ClientHandler clientHandler = new ClientHandler(client);
            //啓動線程
            clientHandler.start();
        }

    }
    //多個客戶端時，需要進行異步操作處理
    private static class ClientHandler extends Thread{
        private Socket socket;
        private boolean flag =true;

        ClientHandler(Socket socket){
            this.socket = socket;
        }
      @Override
        public void run(){
            super.run();
          System.out.println("新客戶端連接："+socket.getInetAddress()+"p:"+socket.getPort());
          try{
              //得到打印流，用戶數據輸出，服務器會送數據使用
              PrintStream socketOutput = new PrintStream(socket.getOutputStream());
              //得到輸入流，用於接收數據
              BufferedReader socketInput = new BufferedReader(new InputStreamReader(socket.getInputStream()));
              do{
                  //客戶端，拿到一條數據
                  String str = socketInput.readLine();
                  if("bye".equalsIgnoreCase(str)){
                      flag = false;
                      //回送
                      socketOutput.println("bye");
                  }else{
                      //打印到屏幕，並回送數據長度
                      System.out.println(str);
                      socketOutput.println("回送："+str.length());
                  }
              }while(flag);
              socketInput.close();
              socketOutput.close();
          }catch(Exception e){
              System.out.println("連接異常斷開");
          }finally {
              try {
                  socket.close();
              } catch (IOException e) {
                  e.printStackTrace();
              }
          }
          System.out.println("客戶端已關閉："+socket.getInetAddress()+"P:"+socket.getPort());
      }
    }
}