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Java网络编程笔记

程序员文章站 2022-03-05 15:39:00
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网络编程

1. InetAddress

package com.mashiro.lesson01;

import java.net.InetAddress;
import java.net.UnknownHostException;

public class INetAddressTest {

    public static void main(String[] args) {
        InetAddress inetAddress;
        InetAddress inetAddress1;
        InetAddress inetAddress2;
        InetAddress inetAddress3;
        try {
            inetAddress = InetAddress.getByName("127.0.0.1");
            System.out.println(inetAddress);

            inetAddress1 = InetAddress.getByName("localhost");
            System.out.println(inetAddress1);

            inetAddress2 = InetAddress.getLocalHost();
            System.out.println(inetAddress2);

            inetAddress3 = InetAddress.getByName("www.baidu.com");
            System.out.println(inetAddress3);

            System.out.println(inetAddress3.getAddress());
            System.out.println(inetAddress3.getCanonicalHostName());
            System.out.println(inetAddress3.getHostAddress());
            System.out.println(inetAddress3.getHostName());


        } catch (UnknownHostException e) {
            e.printStackTrace();
        }
    }
}

2. TCP

2.1. TCP Test01

  • Client
package com.mashiro.lesson02;

import java.io.IOException;
import java.io.OutputStream;
import java.net.InetAddress;
import java.net.Socket;

public class TcpClient {

    public static void main(String[] args) {
        Socket socket = null;
        OutputStream os = null;
        try {
            // 1.客户端创建Socket连接
            InetAddress address = InetAddress.getByName("127.0.0.1");
            int port = 6666;
            socket = new Socket(address,port);
            // 2.
            os = socket.getOutputStream();
            os.write("Hello,Java Socket".getBytes());
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (os != null){
                try {
                    os.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            if (socket != null){
                try {
                    socket.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }
}
  • Server
package com.mashiro.lesson02;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.ServerSocket;
import java.net.Socket;

public class TcpServer {

    public static void main(String[] args) {
        ServerSocket serverSocket = null;
        InputStream is = null;
        ByteArrayOutputStream baos = null;

        try {
            // 1.创建服务器连接 ip
            serverSocket = new ServerSocket(6666);

            while (true){
                // 2.等待获取客户端连接请求
                Socket socket = serverSocket.accept();
                // 3.读取客户端发送的信息
                is = socket.getInputStream();
                // 4.创建信息管道流
                baos = new ByteArrayOutputStream();
                byte[] buffer = new byte[1024];
                int len;
                while ((len=is.read(buffer)) != -1){
                    baos.write(buffer,0,len);
                }
                System.out.println(baos.toString());
            }
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (baos != null){
                try {
                    baos.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            if (is != null){
                try {
                    is.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            if (serverSocket != null){
                try {
                    serverSocket.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }

}

2.2.TCP Test02

  • Client
package com.mashiro.lesson02;

import java.io.*;
import java.net.InetAddress;
import java.net.Socket;
import java.net.UnknownHostException;

public class TcpClient2 {

    public static void main(String[] args) throws Exception {
        // 1.创建socket连接
        InetAddress address = InetAddress.getByName("127.0.0.1");
        int port = 9000;
        Socket socket = new Socket(address, port);
        // 2. 创建socket输出流
        OutputStream ops = socket.getOutputStream();

        // 3. 创建文件输入流,并读取文件
        FileInputStream fis = new FileInputStream(new File("1.png"));
        byte[] buffer = new byte[1024];
        int len;
        while((len = fis.read(buffer)) != -1){
            // 4. 向服务器写入流
            ops.write(buffer,0,len);
        }

        // 4. 通知服务器文件发送完毕,结束输出流
        socket.shutdownOutput();

        // 5.获取服务器反馈信息
        InputStream inputStream = socket.getInputStream();
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        byte[] buffer2 = new byte[1024];
        int len2;
        while ((len2 = inputStream.read(buffer2)) != -1){
            baos.write(buffer2,0,len2);
        }
        System.out.println(baos.toString());

        // 6.释放资源
        baos.close();
        inputStream.close();
        fis.close();
        ops.close();
        socket.close();
    }
}
  • Server
package com.mashiro.lesson02;

import java.io.*;
import java.net.ServerSocket;
import java.net.Socket;

public class TcpServer2 {

    public static void main(String[] args) throws Exception {
        // 1. 开放服务器连接端口
        ServerSocket serverSocket = new ServerSocket(9000);
        // 2. 获取客户端连接请求
        Socket socket = serverSocket.accept();
        // 3.创建socket输入流,获取客户端输入
        InputStream is = socket.getInputStream();
        // 4.创建文件输出流,写出文件
        FileOutputStream fos = new FileOutputStream("result.png");
        byte[] buffer = new byte[1024];
        int len;
        while ((len = is.read(buffer)) != -1){
            fos.write(buffer,0,len);
        }

        // 5.文件接收完毕,反馈客户端
        OutputStream outputStream = socket.getOutputStream();
        outputStream.write("File Send Success".getBytes());

        // 6.释放资源
        outputStream.close();
        fos.close();
        is.close();
        socket.close();
        serverSocket.close();
    }
}

3. UDP

  • package com.mashiro.lesson03;
    
    import java.net.DatagramPacket;
    import java.net.DatagramSocket;
    import java.net.InetAddress;
    import java.net.SocketException;
    
    public class UdpClient {
    
        public static void main(String[] args) throws Exception {
    
            DatagramSocket socket = new DatagramSocket();
    
            String msg = "Hello Udp Packet";
            InetAddress address = InetAddress.getByName("localhost");
            int port = 9090;
            DatagramPacket packet = new DatagramPacket(msg.getBytes(),0,msg.getBytes().length, address,port);
    
            socket.send(packet);
    
            socket.close();
        }
    }
    
    
  • package com.mashiro.lesson03;
    
    
    import java.net.DatagramPacket;
    import java.net.DatagramSocket;
    
    
    public class UdpServer {
    
        public static void main(String[] args) throws Exception {
    
            DatagramSocket socket = new DatagramSocket(9090);
    
            byte[] buffer = new byte[1024];
            DatagramPacket packet = new DatagramPacket(buffer,0,buffer.length);
    
            socket.receive(packet);
    
            System.out.println(packet.getAddress().getHostAddress());
            System.out.println(new String(packet.getData(), 0, packet.getLength()));
    
            socket.close();
        }
    }