Socket网络编程

来源：互联网发布：mac foobar 编辑：程序博客网时间：2024/06/17 08:16

实例分析

1、下面是一个基于TCP通过socket实现client端和server端的通信程序。（类似于简单的聊天程序）

//服务器程序package oracle.hl.Sockets;import java.io.BufferedReader;import java.io.InputStreamReader;import java.io.PrintWriter;import java.net.ServerSocket;import java.net.Socket;/** * Socket编程 服务器程序 * @author Administrator * */public class SocketMyServer {    public static void main(String args[]){        try{            //建立ServerSocket并等待连接请求            ServerSocket server = new ServerSocket(1700);            Socket socket = server.accept();            //连接建立，通过Socket获得连接上的输入\输入流            BufferedReader in = new BufferedReader(new InputStreamReader(socket.getInputStream()));            PrintWriter pw = new PrintWriter(socket.getOutputStream());            //获取标准输入流，从键盘上接收数据            BufferedReader sin = new BufferedReader(new InputStreamReader(System.in));            //先读取Client发送的数据,然后从标准输入读取数据发送给Client            //当接收到bye时关闭连接            String s ;            while(!(s=in.readLine()).equals("bye")){                System.out.println("# Received from Client: "+s);                System.out.print("@ To Client:" );                pw.println(sin.readLine());                pw.flush();            }            System.out.println("The Connection is closing....");            //关闭各种连接            in.close();            pw.close();            socket.close();            server.close();        }catch(Exception e){            e.printStackTrace();        }    }}

//客户端程序package oracle.hl.Sockets;import java.io.BufferedReader;import java.io.InputStreamReader;import java.io.PrintWriter;import java.net.Socket;/** * Socket客户端程序 * @author Administrator */public class SocketMyClient {    public static void main(String[] args) {        try {            System.out.println("client is runing:");                Socket socket = new Socket("127.0.0.1",1700);       //发出连接请求            //建立连接，通过Socket获取连接上的输入\输出流            PrintWriter out = new PrintWriter(socket.getOutputStream());            BufferedReader in = new BufferedReader(new InputStreamReader(socket.getInputStream()));            //创建标准输入流，从键盘接收数据            BufferedReader sin = new BufferedReader(new InputStreamReader(System.in));            //从标准输入中读取一行数据，发送给Server端，当用户输入bye时结束连接            String s ;            do{                System.out.print("# To Server : ");                s = sin.readLine();                out.println(s);                out.flush();                if(!s.equals("bye")){                    System.out.println("@ server response:" + in.readLine());                }else{                    System.out.println("The connection is closing");                }            }while(!s.equals("bye"));            //关闭各种连接            out.close();            in.close();            socket.close();        } catch (Exception e) {            // TODO: handle exception        }    }}

测试结果截图：
这里写图片描述

2、基于UDP协议的网络通信，通过 DatagramSocket类的一个文件传输的小程序

服务器端程序：

package oracle.hl.Sockets;import java.io.BufferedReader;import java.io.FileReader;import java.io.IOException;import java.net.DatagramPacket;import java.net.DatagramSocket;import java.net.InetAddress;public class MyUdpServer {    DatagramSocket socket = null;    BufferedReader br = null;    boolean moreQuotes = true;    public void serverWork()throws IOException{        //创建数据报套接字        socket = new DatagramSocket(5000);        //制定要返回给客户端数据的数据源        br = new BufferedReader(new FileReader("SocketMyClient.java"));        while(moreQuotes){            //构造字节缓冲区            byte [] buf = new byte[256];            //接收客户端程序发过来的数据报            DatagramPacket packet = new DatagramPacket(buf, buf.length);            socket.receive(packet);            String dString = null;            if((dString = br.readLine()).equals("bye")){                br.close();                moreQuotes = false;                dString = "no more sentences . Bye";            }            //获取要发送的数据            buf = dString.getBytes();            //记录客户端主机的ip地址、端口号等。            InetAddress  address  = packet.getAddress();                int port = packet.getPort();            //构造向客户端发送的数据包            packet = new DatagramPacket(buf,buf.length,address,port);            socket.send(packet);        }        socket.close();    }    //服务器端程序入口    public static void main(String args []){        MyUdpServer server = new MyUdpServer();        try{            server.serverWork();        }catch(IOException e){            e.printStackTrace();        }    }}

客户端程序：

package oracle.hl.Sockets;import java.io.IOException;import java.net.DatagramPacket;import java.net.DatagramSocket;import java.net.InetAddress;public class MyUdpClient {    public static void main(String[] args) throws IOException {        boolean flags = true;        //构造数据报Socket        DatagramSocket socket = new DatagramSocket();        //下面是通过名字获取本机的ip地址        InetAddress address = InetAddress.getByName("localhost");//      InetAddress ad = InetAddress.getLocalHost();//      System.out.println(ad);        //构造请求数据包并发送        System.out.println("The sentence by the server :\n");        while(flags){            byte[] buf= new byte[256];            //发送空数据报给服务器            DatagramPacket packet = new DatagramPacket(buf,buf.length,address,5000);            socket.send(packet);            //构造接受数据报并启动接受            packet = new DatagramPacket(buf,buf.length);            socket.receive(packet);            //受到Server端响应数据报，获取数据并显示。            String received = new String(packet.getData());            if(received.equals("no more sentences . Bye")) flags = false;            System.out.println(received);        }        //关闭数据报        socket.close();    }}

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Socket网络编程

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