import org.junit.Test;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.InetAddress;
import java.net.ServerSocket;
import java.net.Socket;

/**
 * @author 
 * @date 2021/4/2 19:42
 */
public class TCPTest {
//    客户端
    @Test
    public void client(){
        Socket socket= null;
        OutputStream outputStream= null;
        try {
//        创建socket对象，端口号为8848自定义，并指明ip地址
            InetAddress net=InetAddress.getByName("127.0.0.1");
            socket = new Socket(net,8848);
//        获取输出流，准备传输
            outputStream = socket.getOutputStream();
//        写入信息
            outputStream.write("hello world".getBytes());
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            //        关闭流文件
            if (outputStream!=null){
                try {
                    outputStream.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            if (socket!=null){
                try {
                    socket.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }


        }



    }
//    服务器
    @Test
    public void server() {
        ServerSocket serverSocket= null;
        Socket socket= null;
        InputStream inputStream= null;
        try {
//        创建服务器的serversocket，指明自己的端口号
            serverSocket = new ServerSocket(8848);
//        调用accept，接收客户端的socket
            socket = serverSocket.accept();
//        获取输入流
            inputStream = socket.getInputStream();
//        读取输入流数据
            byte[] bytes=new byte[1024];
            int len;
            while ((len=inputStream.read(bytes))!=-1){
                String s=new String(bytes,0,len);
                System.out.println(s);
            }
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (inputStream!=null){
                try {
                    inputStream.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            if (socket!=null){
                try {
                    socket.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            if (serverSocket!=null){
                try {
                    serverSocket.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }
}