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UDP 类似发短息 ，寄快递， 对方可收可不收 package JUC.UDP; import java.io.IOException; import java.net.*; public class DatagramSocketTest { public static void main(String[] args) throws IOException { DatagramSocket datagramSocket = new DatagramSocket();

模拟客户端发送消息，服务端接收 服务端： package JUC.tcp; import java.io.ByteArrayOutputStream; import java.io.IOException; import java.io.InputStream; import java.net.ServerSocket; import java.net.Socket; public class TcpServerTest { public static void main(String[]