package top.qaqaq.java.P624;

import org.junit.jupiter.api.Test;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.InetAddress;
import java.net.ServerSocket;
import java.net.Socket;

/**
 * 实现TCP的网络编程
 * 例子1：客户端发送信息给服务端，服务端将数据显示在控制台上
 *
 *
 * @author RichieZhang
 * @create 2022-10-31 下午 9:40
 */
public class TCPTest1 {

    //客户端
    @Test
    public void client() {

        Socket socket = null;
        OutputStream os = null;
        try {
            //1. 创建Socket对象，指明服务器端的ip和端口号
            InetAddress inet = InetAddress.getByName("192.168.31.190");
            socket = new Socket(inet,8899);
            // 2. 获取一个输出流，用于输出数据
            os = socket.getOutputStream();
            // 3. 写出数据的操作
            os.write("你好，我是客户端mm".getBytes());
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            // 4. 资源的关闭
            if (os != null){
                try {
                    os.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }

            }

            if (os != null){
                try {
                    socket.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }

            }
        }

    }

    //服务端
    @Test
    public void server() {

        ServerSocket ss = null;
        Socket socket = null;
        InputStream is = null;
        ByteArrayOutputStream baos = null;
        try {
            // 1. 创建服务器端的ServerSocket，指明自己的端口号
            ss = new ServerSocket(8899);
            // 2. 调用accept()表示接受来自于客户端的socket
            socket = ss.accept();
            // 3. 获取输入流
            is = socket.getInputStream();

            //不建议这样写，可能会有乱码
//        byte[] buffer = new byte[1024];
//        int len;
//        while ((len = is.read(buffer)) != -1){
//            String str = new String(buffer, 0, len);
//            System.out.println(str);
//        }

            // 4. 读取输入流中的数据
            baos = new ByteArrayOutputStream();
            byte[] buffer = new byte[5];
            int len;
            while ((len = is.read(buffer)) != -1){
                baos.write(buffer,0,len);
            }

            System.out.println(baos.toString());

            System.out.println("收到了来自于：" + socket.getInetAddress().getHostAddress() + "的数据");
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (baos != null){
                // 5. 关闭资源
                try {
                    baos.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }

            if (is != null){
                try {
                    is.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }

            if (socket != null){
                try {
                    socket.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }

            if (ss != null){
                try {
                    ss.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }

    }
}