浅谈java的TCP和UDP编程(附实例讲解)

import java.io.BufferedReader;import java.io.InputStreamReader;import java.io.PrintWriter;import java.net.Socket;public class MyClient {  public static void main(String[] args) throws Exception{        Socket socket = null;    BufferedReader in = null;    PrintWriter out = null;        BufferedReader input = null;    // 请求指定ip和端口号的服务器    socket = new Socket("127.0.0.1",3333);        while(true){      in = new BufferedReader(new InputStreamReader(socket.getInputStream()));            out = new PrintWriter(socket.getOutputStream(), true);      // 接收控制台的输入      input = new BufferedReader(new InputStreamReader(System.in));      // out.println("this is client info!");      String info = input.readLine();            out.println(info);            String str = in.readLine();            System.out.println("客户端显示--》服务器的信息：" + str);    }    //in.close();    //out.close();  }}

import java.io.BufferedReader;import java.io.InputStreamReader;import java.io.PrintWriter;import java.net.ServerSocket;import java.net.Socket;public class MyServices {  public static void main(String[] args) throws Exception{    ServerSocket ss = null;    Socket socket = null;    BufferedReader in = null;    PrintWriter out = null;    BufferedReader input = null;        // 监听3333端口    ss = new ServerSocket(3333);    // 等待接收客户端的请求    socket = ss.accept();    while(true){      // 获取连接对象的输入流      in = new BufferedReader(new InputStreamReader(socket.getInputStream()));      // 获取客户端的输入信息      String str = in.readLine();            input = new BufferedReader(new InputStreamReader(System.in));            System.out.println("服务器显示-->客户端输入数据：" + str);            out = new PrintWriter(socket.getOutputStream(),true);      // 将数据输出到客户端      // out.println("hehe");      String info = input.readLine();            out.println(info);    }//    in.close();//    out.flush();//    out.close();  }}

import java.net.DatagramPacket;import java.net.DatagramSocket;public class UDPClient {  public static void main(String[] args) throws Exception {        DatagramSocket ds = null;    DatagramPacket dp = null;    byte[] buf = new byte[1024];        ds = new DatagramSocket(3333);    dp = new DatagramPacket(buf, 1024);        // 接收数据，放入数据报    ds.receive(dp);    // 从数据报中取出数据    String info = new String(dp.getData(),0, dp.getLength());    System.out.println("接收到的信息是：" + info);  }}

import java.net.DatagramPacket;import java.net.DatagramSocket;import java.net.InetAddress;public class UDPServer {  public static void main(String[] args) throws Exception {    DatagramSocket ds = null;    DatagramPacket dp = null;        // 构建发送对象    ds = new DatagramSocket();    // 将数据打包-->打成数据报    String info = "hello world!";        dp = new DatagramPacket(info.getBytes(), info.length(), InetAddress.getByName("localhost"),3333);        // 发出数据报    ds.send(dp);      }}