Socket通信

1、TCP通信

服务端：

//新建ServerSocket对象监听8080端口(端口号最好1024-5 0-1023为系统保留端口)
ServerSocket serverSocket=new ServerSocket(8080);
//
Socket socket=serverSocket.accept();
//
InputStream is=socket.getInputStream();
//
InputStreamReader in=new InputStreamReader(is);
BufferedReader reader=new BufferedReader(in);
//
PrintWriter out=new PrintWriter(socket.getOutputStream());
String str=reader.readLine();

 客户端:

Socket socket=new Socket("127.0.0.1",8080);
OutputStream outputStream=socket.getOutputStream();
PrintWriter out =new PrintWriter(outputStream);
out.println("1:112:123");
out.flush();

 2、UDP

服务器：

//DatagramSocket表示接受或发送数据报的套接字(udp)
DatagramSocket socket=new DatagramSocket(8181);
System.out.println("服务器启动");
while(true){
    //存放数据
    byte[] buf=new byte[1024];
    //新建DatagramPacket用来存放接收到的数据报包
    DatagramPacket packet=new DatagramPacket(buf, 0, buf.length);
    //接收数据
    socket.receive(packet);
    //打印数据
    System.out.println(new String(packet.getData()));
    //打印地址
    System.out.println(packet.getAddress());
    //打印端口
    System.out.println(packet.getPort());
}

客户端：

String msg="你妹的世界末日";
byte[] buf=msg.getBytes();
DatagramPacket packet=new DatagramPacket(buf, buf.length);
InetAddress iaddr=InetAddress.getByName("127.0.0.1");
packet.setAddress(iaddr);
packet.setPort(8181);
DatagramSocket socket=new DatagramSocket(8182);
socket.send(packet);