java实现从文件“package.txt”中读取数据包,解析数据包内容,输出目标MAC地址、本机MAC地址、本机IP地址、目标IP地址、本机端口、目标端口信息。
时间: 2023-08-16 13:07:36 浏览: 53
好的,以下是Java实现的代码示例:
```java
import java.io.*;
import java.net.*;
import java.nio.ByteBuffer;
public class PackageParser {
public static void main(String[] args) {
String filePath = "package.txt";
try (FileInputStream fis = new FileInputStream(filePath)) {
byte[] packet = fis.readAllBytes();
// 解析以太网头
byte[] destMacBytes = new byte[6];
byte[] srcMacBytes = new byte[6];
ByteBuffer ethBuffer = ByteBuffer.wrap(packet, 0, 14);
ethBuffer.get(destMacBytes);
ethBuffer.get(srcMacBytes);
String destMac = macAddressToString(destMacBytes);
String srcMac = macAddressToString(srcMacBytes);
// 解析IP头
int protocol = packet[14 + 9] & 0xff;
byte[] srcIpBytes = new byte[4];
byte[] destIpBytes = new byte[4];
ByteBuffer ipBuffer = ByteBuffer.wrap(packet, 14, 20);
ipBuffer.get();
ipBuffer.get();
ipBuffer.getShort();
ipBuffer.getShort();
ipBuffer.getShort();
ipBuffer.get();
ipBuffer.get();
ipBuffer.getShort();
ipBuffer.get(srcIpBytes);
ipBuffer.get(destIpBytes);
String srcIp = InetAddress.getByAddress(srcIpBytes).getHostAddress();
String destIp = InetAddress.getByAddress(destIpBytes).getHostAddress();
// 解析TCP/UDP头
int srcPort = 0;
int destPort = 0;
if (protocol == 6) { // TCP
ByteBuffer tcpBuffer = ByteBuffer.wrap(packet, 34, 20);
srcPort = tcpBuffer.getShort() & 0xffff;
destPort = tcpBuffer.getShort() & 0xffff;
} else if (protocol == 17) { // UDP
ByteBuffer udpBuffer = ByteBuffer.wrap(packet, 34, 8);
srcPort = udpBuffer.getShort() & 0xffff;
destPort = udpBuffer.getShort() & 0xffff;
}
// 输出信息
System.out.println("目标MAC地址:" + destMac);
System.out.println("本机MAC地址:" + srcMac);
System.out.println("本机IP地址:" + srcIp);
System.out.println("目标IP地址:" + destIp);
System.out.println("本机端口:" + srcPort);
System.out.println("目标端口:" + destPort);
} catch (IOException e) {
e.printStackTrace();
}
}
private static String macAddressToString(byte[] mac) {
StringBuilder sb = new StringBuilder();
for (int i = 0; i < mac.length; i++) {
sb.append(String.format("%02X%s", mac[i], (i < mac.length - 1) ? ":" : ""));
}
return sb.toString();
}
}
```
和Python实现类似,这个代码示例也只是简单地解析数据包头部,没有处理所有可能的错误情况。在实际应用中,还需要进行更完善的错误处理。
相关推荐
![text/x-java](https://img-home.csdnimg.cn/images/20210720083646.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)