网络和服务-优快云博客

本文链接：https://blog.youkuaiyun.com/qq_51626275/article/details/119521640

该博客展示了两个Java程序，分别实现UDP发送和接收数据包，以及TCP进行文件传输。UDP程序通过DatagramSocket发送和接收字符串，当接收到特定退出信号('886')时终止。TCP程序中，一个程序读取文本文件并写入到连接的Socket，另一程序接收数据并保存到文件，同样在接收到特定退出信号后关闭连接。

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以后有时间再加注释

package com.haojinhui2.wangluo;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;

public class Send {
    public static void main(String[] args) throws IOException {
        DatagramSocket ds = new DatagramSocket();
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        DatagramPacket dp = new DatagramPacket("".getBytes(), 0, InetAddress.getByName("192.168.199.1"), 10086);
        while (true) {
            String line = br.readLine();
            dp.setData(line.getBytes(), 0, line.length());
            ds.send(dp);
            if (line.equals("886")) {
                break;
            }
        }
        ds.close();
    }
}

package com.haojinhui2.wangluo;

import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;

public class Receive {
    public static void main(String[] args) throws IOException {
        DatagramSocket ds = new DatagramSocket(10086);
        byte[] bytes = new byte[1024];
        DatagramPacket dp = new DatagramPacket(bytes, bytes.length);
        while (true) {
            ds.receive(dp);
            String s = new String(dp.getData(), 0, dp.getLength());
            if (s.equals("886")) {
                break;
            }
            System.out.println(s);
        }
        ds.close();
    }
}

package com.haojinhui2.wangluo;

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

public class Send2 {
    public static void main(String[] args) throws IOException {
        Socket socket = new Socket("192.168.199.1", 10010);
        BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(socket.getOutputStream()));
        BufferedReader br = new BufferedReader(new FileReader("text2.txt"));
        BufferedReader br2 = new BufferedReader(new InputStreamReader(socket.getInputStream()));  // 接受服务器段反馈
        String line = "";
        while ((line = br.readLine()) != null) {
            bw.write(line);
            bw.newLine();
            bw.flush();
        }
        socket.shutdownOutput();  // 输出结束的标记
        System.out.println(br2.readLine());
        br.close();
        socket.close();
    }
}

package com.haojinhui2.wangluo;

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

public class Receive2 {
    public static void main(String[] args) throws IOException {
        ServerSocket ss = new ServerSocket(10010);
        Socket socket = ss.accept();
        BufferedWriter bw2 = new BufferedWriter(new OutputStreamWriter(socket.getOutputStream()));  // 本服务端反馈
        BufferedReader br = new BufferedReader(new InputStreamReader(socket.getInputStream()));  // 接收客户端
        BufferedWriter bw = new BufferedWriter(new FileWriter("text.txt"));  // 输出文件
        String line = "";
        while ((line = br.readLine()) != null) {
            bw.write(line);
            bw.newLine();
            bw.flush();
            System.out.println(line);
        }
        bw2.write("接收完毕");
        bw2.newLine();
        bw2.flush();
        bw.close();
        ss.close();
    }
}