网络编程之TCP和UDP

网络编程:ServerSocket、Socket

TCP协议

客户端:

public class TestClient {

public static void main(String[] args) throws Exception {

Socket sc = new Socket("127.0.0.1",8888);

BufferedReader br = new BufferedReader(new InputStreamReader(sc.getInputStream()));

System.out.println(br.readLine());

sc.close();

br.close();

}

}

服务端:

public class TestServer {

public static void main(String[] args) throws Exception {

ServerSocket ss = new ServerSocket(8888);

System.out.println("等待客户端连接......");

Socket client = ss.accept();

PrintWriter pw = null;

String str = "今天天气好晴朗，适合打篮球呀";

pw = new PrintWriter(client.getOutputStream());

pw.print(str);

pw.close();

client.close();

ss.close();

}

}

UDP协议

发送端:

public class UdpSend {

public static void main(String[] args) throws Exception {

DatagramSocket ds = new DatagramSocket();

String str = "今天天气好晴朗，春天来了";

byte[] bys = str.getBytes();

InetAddress ia = InetAddress.getByName("192.168.1.102");

DatagramPacket dp = new DatagramPacket(bys,bys.length, ia, 2323);

ds.send(dp);

ds.close();

}

}

接受端:

public class UdpReceive {

public static void main(String[] args) throws Exception {

DatagramSocket ds = new DatagramSocket(2323);

byte[] bys = new byte[1024];

DatagramPacket dp = new DatagramPacket(bys, bys.length);

ds.receive(dp);

String str = new String(dp.getData(),0,dp.getLength());

System.out.print(dp.getAddress().getHostName());

System.out.print(dp.getPort());

System.out.println(str);

}

}

UDP与TCP的区别:

UDP：

将数据及源和目的封装成数据包；每个数据包限制在64K方位内；是不可靠协议；不需要建立连接，速度快

TCP:

需要连接，建立传输数据的通道；在连接中进行大量数据传输；通过三次握手完成连接，是可靠协议；必须建立连接，效率稍微低些

本文出自 “java技术” 博客，请务必保留此出处http://ibill.blog.51cto.com/2210057/810787