网络协议分析-http/https/tcp/udp-Toy模板网

这篇具有很好参考价值的文章主要介绍了网络协议分析-http/https/tcp/udp。希望对大家有所帮助。如果存在错误或未考虑完全的地方，请大家不吝赐教，您也可以点击"举报违法"按钮提交疑问。

TCP三次握手/TCP三次挥手

“三次握手”的目的是“为了防止已失效的连接请求报文段突然又传送到了服务端，因而产生错误”。主要目的防止 server 端一直等待，浪费资源。换句话说，即是为了保证服务端能收接受到客户端的信息并能做出正确的应答而进行前两次(第一次和第二次)握手，为了保证客户端能够接收到服务端的信息并能做出正确的应答而进行后两次(第二次和第三次)握手。

“四次挥手”原因是因为 tcp 是全双工模式，接收到 FIN 时意味将没有数据再发来，但是还是可以继续发送数据。
网络协议分析-http/https/tcp/udp,网络协议,http,https,tcp,upd

TCP三次握手

网络协议分析-http/https/tcp/udp,网络协议,http,https,tcp,upd

TCP四次挥手

网络协议分析-http/https/tcp/udp,网络协议,http,https,tcp,upd

完整报文

# 三次握手:SYN=1 Seq=0
No.     Time           Source                Destination           Protocol Length Info
     50 7.055660280    127.0.0.1             127.0.0.1             TCP      74     44156 → 12345 [SYN] Seq=0 Win=65495 Len=0 MSS=65495 SACK_PERM TSval=2731439096 TSecr=0 WS=128

Frame 50: 74 bytes on wire (592 bits), 74 bytes captured (592 bits) on interface lo, id 0
    Section number: 1
    Interface id: 0 (lo)
    Encapsulation type: Ethernet (1)
    Arrival Time: Aug 29, 2023 08:26:32.312489778 EDT
    [Time shift for this packet: 0.000000000 seconds]
    Epoch Time: 1693311992.312489778 seconds
    [Time delta from previous captured frame: 0.004110298 seconds]
    [Time delta from previous displayed frame: 0.000000000 seconds]
    [Time since reference or first frame: 7.055660280 seconds]
    Frame Number: 50
    Frame Length: 74 bytes (592 bits)
    Capture Length: 74 bytes (592 bits)
    [Frame is marked: False]
    [Frame is ignored: False]
    [Protocols in frame: eth:ethertype:ip:tcp]
    [Coloring Rule Name: TCP SYN/FIN]
    [Coloring Rule String: tcp.flags & 0x02 || tcp.flags.fin == 1]
Ethernet II, Src: 00:00:00_00:00:00 (00:00:00:00:00:00), Dst: 00:00:00_00:00:00 (00:00:00:00:00:00)
Internet Protocol Version 4, Src: 127.0.0.1, Dst: 127.0.0.1
Transmission Control Protocol, Src Port: 44156, Dst Port: 12345, Seq: 0, Len: 0

# 三次握手:SYN1 ACK=1 Seq=0
No.     Time           Source                Destination           Protocol Length Info
     51 7.055692471    127.0.0.1             127.0.0.1             TCP      74     12345 → 44156 [SYN, ACK] Seq=0 Ack=1 Win=65483 Len=0 MSS=65495 SACK_PERM TSval=2731439096 TSecr=2731439096 WS=128

Frame 51: 74 bytes on wire (592 bits), 74 bytes captured (592 bits) on interface lo, id 0
    Section number: 1
    Interface id: 0 (lo)
    Encapsulation type: Ethernet (1)
    Arrival Time: Aug 29, 2023 08:26:32.312521969 EDT
    [Time shift for this packet: 0.000000000 seconds]
    Epoch Time: 1693311992.312521969 seconds
    [Time delta from previous captured frame: 0.000032191 seconds]
    [Time delta from previous displayed frame: 0.000032191 seconds]
    [Time since reference or first frame: 7.055692471 seconds]
    Frame Number: 51
    Frame Length: 74 bytes (592 bits)
    Capture Length: 74 bytes (592 bits)
    [Frame is marked: False]
    [Frame is ignored: False]
    [Protocols in frame: eth:ethertype:ip:tcp]
    [Coloring Rule Name: TCP SYN/FIN]
    [Coloring Rule String: tcp.flags & 0x02 || tcp.flags.fin == 1]
Ethernet II, Src: 00:00:00_00:00:00 (00:00:00:00:00:00), Dst: 00:00:00_00:00:00 (00:00:00:00:00:00)
Internet Protocol Version 4, Src: 127.0.0.1, Dst: 127.0.0.1
Transmission Control Protocol, Src Port: 12345, Dst Port: 44156, Seq: 0, Ack: 1, Len: 0

# 三次握手:Ack=1 Seq=1
No.     Time           Source                Destination           Protocol Length Info
     52 7.055725041    127.0.0.1             127.0.0.1             TCP      66     44156 → 12345 [ACK] Seq=1 Ack=1 Win=65536 Len=0 TSval=2731439096 TSecr=2731439096

Frame 52: 66 bytes on wire (528 bits), 66 bytes captured (528 bits) on interface lo, id 0
    Section number: 1
    Interface id: 0 (lo)
    Encapsulation type: Ethernet (1)
    Arrival Time: Aug 29, 2023 08:26:32.312554539 EDT
    [Time shift for this packet: 0.000000000 seconds]
    Epoch Time: 1693311992.312554539 seconds
    [Time delta from previous captured frame: 0.000032570 seconds]
    [Time delta from previous displayed frame: 0.000032570 seconds]
    [Time since reference or first frame: 7.055725041 seconds]
    Frame Number: 52
    Frame Length: 66 bytes (528 bits)
    Capture Length: 66 bytes (528 bits)
    [Frame is marked: False]
    [Frame is ignored: False]
    [Protocols in frame: eth:ethertype:ip:tcp]
    [Coloring Rule Name: TCP]
    [Coloring Rule String: tcp]
Ethernet II, Src: 00:00:00_00:00:00 (00:00:00:00:00:00), Dst: 00:00:00_00:00:00 (00:00:00:00:00:00)
Internet Protocol Version 4, Src: 127.0.0.1, Dst: 127.0.0.1
Transmission Control Protocol, Src Port: 44156, Dst Port: 12345, Seq: 1, Ack: 1, Len: 0

# 客户端发送消息  Hello, server!.
No.     Time           Source                Destination           Protocol Length Info
     53 7.057834891    127.0.0.1             127.0.0.1             TCP      81     44156 → 12345 [PSH, ACK] Seq=1 Ack=1 Win=65536 Len=15 TSval=2731439098 TSecr=2731439096

Frame 53: 81 bytes on wire (648 bits), 81 bytes captured (648 bits) on interface lo, id 0
    Section number: 1
    Interface id: 0 (lo)
    Encapsulation type: Ethernet (1)
    Arrival Time: Aug 29, 2023 08:26:32.314664389 EDT
    [Time shift for this packet: 0.000000000 seconds]
    Epoch Time: 1693311992.314664389 seconds
    [Time delta from previous captured frame: 0.002109850 seconds]
    [Time delta from previous displayed frame: 0.002109850 seconds]
    [Time since reference or first frame: 7.057834891 seconds]
    Frame Number: 53
    Frame Length: 81 bytes (648 bits)
    Capture Length: 81 bytes (648 bits)
    [Frame is marked: False]
    [Frame is ignored: False]
    [Protocols in frame: eth:ethertype:ip:tcp:data]
    [Coloring Rule Name: TCP]
    [Coloring Rule String: tcp]
Ethernet II, Src: 00:00:00_00:00:00 (00:00:00:00:00:00), Dst: 00:00:00_00:00:00 (00:00:00:00:00:00)
Internet Protocol Version 4, Src: 127.0.0.1, Dst: 127.0.0.1
Transmission Control Protocol, Src Port: 44156, Dst Port: 12345, Seq: 1, Ack: 1, Len: 15
Data (15 bytes)

0000  48 65 6c 6c 6f 2c 20 73 65 72 76 65 72 21 0a      Hello, server!.

# 服务端应答
No.     Time           Source                Destination           Protocol Length Info
     54 7.057859991    127.0.0.1             127.0.0.1             TCP      66     12345 → 44156 [ACK] Seq=1 Ack=16 Win=65536 Len=0 TSval=2731439098 TSecr=2731439098

Frame 54: 66 bytes on wire (528 bits), 66 bytes captured (528 bits) on interface lo, id 0
    Section number: 1
    Interface id: 0 (lo)
    Encapsulation type: Ethernet (1)
    Arrival Time: Aug 29, 2023 08:26:32.314689489 EDT
    [Time shift for this packet: 0.000000000 seconds]
    Epoch Time: 1693311992.314689489 seconds
    [Time delta from previous captured frame: 0.000025100 seconds]
    [Time delta from previous displayed frame: 0.000025100 seconds]
    [Time since reference or first frame: 7.057859991 seconds]
    Frame Number: 54
    Frame Length: 66 bytes (528 bits)
    Capture Length: 66 bytes (528 bits)
    [Frame is marked: False]
    [Frame is ignored: False]
    [Protocols in frame: eth:ethertype:ip:tcp]
    [Coloring Rule Name: TCP]
    [Coloring Rule String: tcp]
Ethernet II, Src: 00:00:00_00:00:00 (00:00:00:00:00:00), Dst: 00:00:00_00:00:00 (00:00:00:00:00:00)
Internet Protocol Version 4, Src: 127.0.0.1, Dst: 127.0.0.1
Transmission Control Protocol, Src Port: 12345, Dst Port: 44156, Seq: 1, Ack: 16, Len: 0

#  服务端发送消息 Server received: Hello, server!.
No.     Time           Source                Destination           Protocol Length Info
     55 7.059237157    127.0.0.1             127.0.0.1             TCP      98     12345 → 44156 [PSH, ACK] Seq=1 Ack=16 Win=65536 Len=32 TSval=2731439100 TSecr=2731439098

Frame 55: 98 bytes on wire (784 bits), 98 bytes captured (784 bits) on interface lo, id 0
    Section number: 1
    Interface id: 0 (lo)
    Encapsulation type: Ethernet (1)
    Arrival Time: Aug 29, 2023 08:26:32.316066655 EDT
    [Time shift for this packet: 0.000000000 seconds]
    Epoch Time: 1693311992.316066655 seconds
    [Time delta from previous captured frame: 0.001377166 seconds]
    [Time delta from previous displayed frame: 0.001377166 seconds]
    [Time since reference or first frame: 7.059237157 seconds]
    Frame Number: 55
    Frame Length: 98 bytes (784 bits)
    Capture Length: 98 bytes (784 bits)
    [Frame is marked: False]
    [Frame is ignored: False]
    [Protocols in frame: eth:ethertype:ip:tcp:data]
    [Coloring Rule Name: TCP]
    [Coloring Rule String: tcp]
Ethernet II, Src: 00:00:00_00:00:00 (00:00:00:00:00:00), Dst: 00:00:00_00:00:00 (00:00:00:00:00:00)
Internet Protocol Version 4, Src: 127.0.0.1, Dst: 127.0.0.1
Transmission Control Protocol, Src Port: 12345, Dst Port: 44156, Seq: 1, Ack: 16, Len: 32
Data (32 bytes)

0000  53 65 72 76 65 72 20 72 65 63 65 69 76 65 64 3a   Server received:
0010  20 48 65 6c 6c 6f 2c 20 73 65 72 76 65 72 21 0a    Hello, server!.

# 客户端还给了一个回应
No.     Time           Source                Destination           Protocol Length Info
     56 7.059273656    127.0.0.1             127.0.0.1             TCP      66     44156 → 12345 [ACK] Seq=16 Ack=33 Win=65536 Len=0 TSval=2731439100 TSecr=2731439100

Frame 56: 66 bytes on wire (528 bits), 66 bytes captured (528 bits) on interface lo, id 0
    Section number: 1
    Interface id: 0 (lo)
    Encapsulation type: Ethernet (1)
    Arrival Time: Aug 29, 2023 08:26:32.316103154 EDT
    [Time shift for this packet: 0.000000000 seconds]
    Epoch Time: 1693311992.316103154 seconds
    [Time delta from previous captured frame: 0.000036499 seconds]
    [Time delta from previous displayed frame: 0.000036499 seconds]
    [Time since reference or first frame: 7.059273656 seconds]
    Frame Number: 56
    Frame Length: 66 bytes (528 bits)
    Capture Length: 66 bytes (528 bits)
    [Frame is marked: False]
    [Frame is ignored: False]
    [Protocols in frame: eth:ethertype:ip:tcp]
    [Coloring Rule Name: TCP]
    [Coloring Rule String: tcp]
Ethernet II, Src: 00:00:00_00:00:00 (00:00:00:00:00:00), Dst: 00:00:00_00:00:00 (00:00:00:00:00:00)
Internet Protocol Version 4, Src: 127.0.0.1, Dst: 127.0.0.1
Transmission Control Protocol, Src Port: 44156, Dst Port: 12345, Seq: 16, Ack: 33, Len: 0

# 四次挥手 1 FIN=1 Ack=33 Seq=16
No.     Time           Source                Destination           Protocol Length Info
     57 7.062253079    127.0.0.1             127.0.0.1             TCP      66     44156 → 12345 [FIN, ACK] Seq=16 Ack=33 Win=65536 Len=0 TSval=2731439103 TSecr=2731439100

Frame 57: 66 bytes on wire (528 bits), 66 bytes captured (528 bits) on interface lo, id 0
    Section number: 1
    Interface id: 0 (lo)
    Encapsulation type: Ethernet (1)
    Arrival Time: Aug 29, 2023 08:26:32.319082577 EDT
    [Time shift for this packet: 0.000000000 seconds]
    Epoch Time: 1693311992.319082577 seconds
    [Time delta from previous captured frame: 0.002979423 seconds]
    [Time delta from previous displayed frame: 0.002979423 seconds]
    [Time since reference or first frame: 7.062253079 seconds]
    Frame Number: 57
    Frame Length: 66 bytes (528 bits)
    Capture Length: 66 bytes (528 bits)
    [Frame is marked: False]
    [Frame is ignored: False]
    [Protocols in frame: eth:ethertype:ip:tcp]
    [Coloring Rule Name: TCP SYN/FIN]
    [Coloring Rule String: tcp.flags & 0x02 || tcp.flags.fin == 1]
Ethernet II, Src: 00:00:00_00:00:00 (00:00:00:00:00:00), Dst: 00:00:00_00:00:00 (00:00:00:00:00:00)
Internet Protocol Version 4, Src: 127.0.0.1, Dst: 127.0.0.1
Transmission Control Protocol, Src Port: 44156, Dst Port: 12345, Seq: 16, Ack: 33, Len: 0

# 四次挥手 2 ACK=17 Seq=33
No.     Time           Source                Destination           Protocol Length Info
     58 7.110165407    127.0.0.1             127.0.0.1             TCP      66     12345 → 44156 [ACK] Seq=33 Ack=17 Win=65536 Len=0 TSval=2731439151 TSecr=2731439103

Frame 58: 66 bytes on wire (528 bits), 66 bytes captured (528 bits) on interface lo, id 0
    Section number: 1
    Interface id: 0 (lo)
    Encapsulation type: Ethernet (1)
    Arrival Time: Aug 29, 2023 08:26:32.366994905 EDT
    [Time shift for this packet: 0.000000000 seconds]
    Epoch Time: 1693311992.366994905 seconds
    [Time delta from previous captured frame: 0.047912328 seconds]
    [Time delta from previous displayed frame: 0.047912328 seconds]
    [Time since reference or first frame: 7.110165407 seconds]
    Frame Number: 58
    Frame Length: 66 bytes (528 bits)
    Capture Length: 66 bytes (528 bits)
    [Frame is marked: False]
    [Frame is ignored: False]
    [Protocols in frame: eth:ethertype:ip:tcp]
    [Coloring Rule Name: TCP]
    [Coloring Rule String: tcp]
Ethernet II, Src: 00:00:00_00:00:00 (00:00:00:00:00:00), Dst: 00:00:00_00:00:00 (00:00:00:00:00:00)
Internet Protocol Version 4, Src: 127.0.0.1, Dst: 127.0.0.1
Transmission Control Protocol, Src Port: 12345, Dst Port: 44156, Seq: 33, Ack: 17, Len: 0

# 四次挥手: 3 Fin=1 Ack=17 Seq=33
No.     Time           Source                Destination           Protocol Length Info
     61 7.390471256    127.0.0.1             127.0.0.1             TCP      66     12345 → 44156 [FIN, ACK] Seq=33 Ack=17 Win=65536 Len=0 TSval=2731439431 TSecr=2731439103

Frame 61: 66 bytes on wire (528 bits), 66 bytes captured (528 bits) on interface lo, id 0
    Section number: 1
    Interface id: 0 (lo)
    Encapsulation type: Ethernet (1)
    Arrival Time: Aug 29, 2023 08:26:32.647300754 EDT
    [Time shift for this packet: 0.000000000 seconds]
    Epoch Time: 1693311992.647300754 seconds
    [Time delta from previous captured frame: 0.000234452 seconds]
    [Time delta from previous displayed frame: 0.280305849 seconds]
    [Time since reference or first frame: 7.390471256 seconds]
    Frame Number: 61
    Frame Length: 66 bytes (528 bits)
    Capture Length: 66 bytes (528 bits)
    [Frame is marked: False]
    [Frame is ignored: False]
    [Protocols in frame: eth:ethertype:ip:tcp]
    [Coloring Rule Name: TCP SYN/FIN]
    [Coloring Rule String: tcp.flags & 0x02 || tcp.flags.fin == 1]
Ethernet II, Src: 00:00:00_00:00:00 (00:00:00:00:00:00), Dst: 00:00:00_00:00:00 (00:00:00:00:00:00)
Internet Protocol Version 4, Src: 127.0.0.1, Dst: 127.0.0.1
Transmission Control Protocol, Src Port: 12345, Dst Port: 44156, Seq: 33, Ack: 17, Len: 0

# 四次挥手 4 Ack=34 Seq=17
No.     Time           Source                Destination           Protocol Length Info
     62 7.390499061    127.0.0.1             127.0.0.1             TCP      66     44156 → 12345 [ACK] Seq=17 Ack=34 Win=65536 Len=0 TSval=2731439431 TSecr=2731439431

Frame 62: 66 bytes on wire (528 bits), 66 bytes captured (528 bits) on interface lo, id 0
    Section number: 1
    Interface id: 0 (lo)
    Encapsulation type: Ethernet (1)
    Arrival Time: Aug 29, 2023 08:26:32.647328559 EDT
    [Time shift for this packet: 0.000000000 seconds]
    Epoch Time: 1693311992.647328559 seconds
    [Time delta from previous captured frame: 0.000027805 seconds]
    [Time delta from previous displayed frame: 0.000027805 seconds]
    [Time since reference or first frame: 7.390499061 seconds]
    Frame Number: 62
    Frame Length: 66 bytes (528 bits)
    Capture Length: 66 bytes (528 bits)
    [Frame is marked: False]
    [Frame is ignored: False]
    [Protocols in frame: eth:ethertype:ip:tcp]
    [Coloring Rule Name: TCP]
    [Coloring Rule String: tcp]
Ethernet II, Src: 00:00:00_00:00:00 (00:00:00:00:00:00), Dst: 00:00:00_00:00:00 (00:00:00:00:00:00)
Internet Protocol Version 4, Src: 127.0.0.1, Dst: 127.0.0.1
Transmission Control Protocol, Src Port: 44156, Dst Port: 12345, Seq: 17, Ack: 34, Len: 0

实例代码

HttpSampleClient

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;

public class HttpSampleClient {
    public static void main(String[] args) {
        try {
            URL url = new URL("http://localhost:8080");
            HttpURLConnection connection = (HttpURLConnection) url.openConnection();
            connection.setRequestMethod("GET");
            int responseCode = connection.getResponseCode();
            System.out.println("Response Code:" + responseCode);
            // read content
            BufferedReader reader = new BufferedReader(new InputStreamReader(connection.getInputStream()));
            String line;
            StringBuilder response = new StringBuilder();
            while ((line = reader.readLine()) != null) {
                response.append(line);
            }
            reader.close();
            System.out.println("Response Body: " + response);
            connection.disconnect();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

HttpSampleServer

import com.sun.net.httpserver.HttpExchange;
import com.sun.net.httpserver.HttpHandler;
import com.sun.net.httpserver.HttpServer;

import java.io.IOException;
import java.io.OutputStream;
import java.net.InetSocketAddress;

public class HttpSampleServer {
    public static void main(String[] args) {
        try {
            // create http server to bind 8080
            HttpServer server = HttpServer.create(new InetSocketAddress("127.0.0.1", 8080), 0);
            // bind path
            server.createContext("/", new MyHandler());
            server.start();
            System.out.println("Http Sever started on port 8080");
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    static class MyHandler implements HttpHandler {
        // 设置响应头c
        @Override
        public void handle(HttpExchange exchange) throws IOException {
            String response = "Hello from the local HTTP server!";
            exchange.sendResponseHeaders(200, response.getBytes().length);

            // 获取输出流并写入响应内容
            OutputStream os = exchange.getResponseBody();
            os.write(response.getBytes());
            os.close();
        }
    }
}

HttpsSampleClient

import javax.net.ssl.*;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.PrintWriter;

public class HttpsSampleClient {
    public static void main(String[] args) {
        try {
            // Create and configure the SSL context
            SSLContext sslContext = SSLContext.getInstance("TLS");
            sslContext.init(null, new TrustManager[]{new X509TrustManager() {
                public java.security.cert.X509Certificate[] getAcceptedIssuers() {
                    return null;
                }

                public void checkClientTrusted(java.security.cert.X509Certificate[] certs, String authType) {
                }

                public void checkServerTrusted(java.security.cert.X509Certificate[] certs, String authType) {
                }
            }}, new java.security.SecureRandom());

            // Create an SSL socket
            SSLSocketFactory sslSocketFactory = sslContext.getSocketFactory();
            SSLSocket socket = (SSLSocket) sslSocketFactory.createSocket("localhost", 12345);

            // Get input and output streams for secure communication
            BufferedReader reader = new BufferedReader(new InputStreamReader(socket.getInputStream()));
            PrintWriter writer = new PrintWriter(socket.getOutputStream(), true); // autoFlush

            // Send a message to the server
            String message = "Hello, server!";
            writer.println(message);

            // Read response from the server
            String serverResponse = reader.readLine();
            System.out.println("Server response: " + serverResponse);

            // Close resources
            reader.close();
            writer.close();
            socket.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

HttpsSampleServer

import javax.net.ssl.*;
import java.io.BufferedReader;
import java.io.FileInputStream;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.security.KeyStore;

public class HttpsSampleServer {
    public static void main(String[] args) {
        String keystorePath = "./keystore.jks";
        char[] keystorePassword = "flannery".toCharArray();

        try {
            // Load the keystore containing the server's SSL certificate
            KeyStore keystore = KeyStore.getInstance("JKS");
            keystore.load(new FileInputStream(keystorePath), keystorePassword);

            // Create and configure the SSL context
            KeyManagerFactory kmf = KeyManagerFactory.getInstance("SunX509");
            kmf.init(keystore, keystorePassword);
            SSLContext sslContext = SSLContext.getInstance("TLS");
            sslContext.init(kmf.getKeyManagers(), null, null);

            // Create an SSL server socket
            SSLServerSocketFactory sslServerSocketFactory = sslContext.getServerSocketFactory();
            SSLServerSocket serverSocket = (SSLServerSocket) sslServerSocketFactory.createServerSocket(12345);

            System.out.println("Server listening on port 12345...");

            // Wait for a client to connect
            SSLSocket clientSocket = (SSLSocket) serverSocket.accept();

            System.out.println("Client connected: " + clientSocket.getInetAddress().getHostAddress());

            // Get input and output streams for secure communication
            BufferedReader reader = new BufferedReader(new InputStreamReader(clientSocket.getInputStream()));
            PrintWriter writer = new PrintWriter(clientSocket.getOutputStream(), true); // autoFlush

            // Read data from client and respond
            String clientMessage;
            while ((clientMessage = reader.readLine()) != null) {
                System.out.println("Received from client: " + clientMessage);
                writer.println("Server received: " + clientMessage);
            }

            // Close resources
            reader.close();
            writer.close();
            clientSocket.close();
            serverSocket.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

TcpSampleClient

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

public class TcpSampleClient {
    public static void main(String[] args) {
        try {
            // Create a socket to connect to the server
            Socket socket = new Socket("localhost", 12345);

            // Get input and output streams for the socket
            InputStream inputStream = socket.getInputStream();
            OutputStream outputStream = socket.getOutputStream();

            // Create readers and writers for easier communication
            BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream));
            PrintWriter writer = new PrintWriter(outputStream, true); // autoFlush

            // Send a message to the server
            String message = "Hello, server!";
            writer.println(message);

            // Read response from the server
            String serverResponse = reader.readLine();
            System.out.println("Server response: " + serverResponse);

            // Close resources
            reader.close();
            writer.close();
            socket.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

TcpSampleServer

import java.io.*;
import java.net.ServerSocket;
import java.net.Socket;
public class TcpSampleServer {
    public static void main(String[] args) {
        extracted();
    }

    private static void extracted() {
        try {
            // Create a server socket
            ServerSocket serverSocket = new ServerSocket(12345);

            System.out.println("Server listening on port 12345...");

            // Wait for a client to connect
            Socket clientSocket = serverSocket.accept();

            System.out.println("Client connected: " + clientSocket.getInetAddress().getHostAddress());

            // Get input and output streams for the socket
            InputStream inputStream = clientSocket.getInputStream();
            OutputStream outputStream = clientSocket.getOutputStream();

            // Create readers and writers for easier communication
            BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream));
            PrintWriter writer = new PrintWriter(outputStream, true); // autoFlush

            // Read data from client and respond
            String clientMessage;
            while ((clientMessage = reader.readLine()) != null) {
                System.out.println("Received from client: " + clientMessage);
                writer.println("Server received: " + clientMessage);
            }

            // Close resources
            //reader.close();
            //writer.close();
            //clientSocket.close();
            //serverSocket.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

}

UdpSampleClient

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

public class UdpSampleClient {public static void main(String[] args) {
        try {
            DatagramSocket clientSocket = new DatagramSocket();

            String message = "Hello, server!";
            byte[] sendData = message.getBytes();

            InetAddress serverAddress = InetAddress.getByName("localhost");
            int serverPort = 12345;

            DatagramPacket sendPacket = new DatagramPacket(sendData, sendData.length, serverAddress, serverPort);
            clientSocket.send(sendPacket);

            byte[] receiveData = new byte[1024];
            DatagramPacket receivePacket = new DatagramPacket(receiveData, receiveData.length);
            clientSocket.receive(receivePacket);

            String serverResponse = new String(receivePacket.getData(), 0, receivePacket.getLength());
            System.out.println("Server response: " + serverResponse);

            clientSocket.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

}

UdpSampleSever

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

public class UdpSampleSever {
    public static void main(String[] args) {
        try {
            DatagramSocket serverSocket = new DatagramSocket(12345);

            System.out.println("Server listening on port 12345...");

            byte[] receiveData = new byte[1024];

            while (true) {
                DatagramPacket receivePacket = new DatagramPacket(receiveData, receiveData.length);
                serverSocket.receive(receivePacket);

                String clientMessage = new String(receivePacket.getData(), 0, receivePacket.getLength());
                System.out.println("Received from client: " + clientMessage);

                InetAddress clientAddress = receivePacket.getAddress();
                int clientPort = receivePacket.getPort();
                String serverResponse = "Server received: " + clientMessage;
                byte[] sendData = serverResponse.getBytes();
                DatagramPacket sendPacket = new DatagramPacket(sendData, sendData.length, clientAddress, clientPort);
                serverSocket.send(sendPacket);
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

资料

超详细的wireshark抓包使用教程
jks证书文件的生成步骤
如何使用wireshark抓取HTTPS数据包？
wireshark抓包分析HTTPS
Burp Suite的基本介绍及使用
渗透测试工具Burp Suite详解
vmware ctrl键粘滞的问题
wireshark过滤规则
Burp Suite HTTPS详解文章来源地址https://www.toymoban.com/news/detail-681126.html

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