基于UDP和TCP协议的Socket(网络编程/套接字)案例

package cn.cet.udp; import java.io.IOException; import java.net.DatagramPacket; import java.net.DatagramSocket; import java.net.InetAddress; import java.net.SocketException; import java.net.UnknownHostException; /** * 服务端 * */ public class DataScoketClient { public static void main(String[] args) { String a="你好，客服端发送一个请求"; byte[] b=a.getBytes(); DatagramSocket socket=null; try { //通过服务端ip地址获得一个InetAddress InetAddress ia=InetAddress.getByName("localhost"); //构建客户端要发送的数据包对象 DatagramPacket dp=new DatagramPacket(b,b.length,ia,5000); //客户端需要一个DatagramSocket对象 socket=new DatagramSocket(); //通过DatagramSocket对象发送数据包到服务器 socket.send(dp); //接收服务器的响应 byte[] replys=new byte[1024]; DatagramPacket dp1=new DatagramPacket(replys,replys.length); socket.receive(dp1); String reply=new String(dp1.getData(),0,dp1.getData().length); System.out.println("服务器回应："+reply); } catch (UnknownHostException e) { e.printStackTrace(); } catch (SocketException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); }finally{ //释放资源 socket.close(); } } }