结合IP获取的网卡信息，Java编程显示物理网卡的arp表

在Java中，获取物理网卡的ARP（地址解析协议）表通常涉及到操作系统级别的操作，因为ARP信息是在底层网络驱动和系统层面维护的。直接从Java程序访问ARP表通常是不可行的，因为它超出了Java应用的安全边界。不过，我们可以借助一些第三方库，如JNA (Java Native Access) 或 JNR (Java Native.Runtime)，来间接地访问操作系统API。

以下是一个简单的示例，使用JNA尝试读取ARP表，但这并不是标准Java编程的一部分，而是一种高级技巧：

import net.lingala.zip4j.core.IOUtils;
import com.sun.jna.Library;
import com.sun.jna.Native;
import com.sun.jna.platform.win32.Win32Library;
import com.sun.jna.ptr.IntByReference;

public class ARPTable {
    private static final String ARP6432 = "iphlpapi.DLL";
    private static final int G_ARPREQUESTINFO_SIZE = 80;

    public static void main(String[] args) throws Exception {
        Win32Library library = Native.loadLibrary(ARP6432, Library.class);
        ArpFindEntry arpFindEntry = new ArpFindEntry();
        ArpRequestInfo arpRequestInfo = new ArpRequestInfo();

        // Initialize the ARP request info struct
        arpRequestInfo.size = G_ARPREQUESTINFO_SIZE;
        IntByReference resultLength = new IntByReference();
        try {
            library.ArpGetEntriesAtInterface(null, -1, null, 0, arpFindEntry, arpRequestInfo, resultLength);
        } catch (Exception e) {
            System.err.println("Error reading ARP table: " + e.getMessage());
            return;
        }

        if (resultLength.getValue() > 0) {
            byte[] buffer = new byte[resultLength.getValue()];
            library.ArpGetEntriesAtInterface(null, -1, buffer, buffer.length, arpFindEntry, arpRequestInfo, resultLength);

            // Process the ARP entries in the buffer here
            // Note: This is a simplified example and does not include parsing or printing ARP entries
            IOUtils.readFully(buffer, System.out);
        } else {
            System.out.println("No ARP entries found.");
        }
    }

    // Define structures for API calls using JNA
    public interface IPHLPAPI extends Win32Library {
        // ... Declare ArpFindEntry and ArpRequestInfo structs here
    }

    @FunctionalInterface
    interface ArpFindEntry extends Callback {
        void callback(ArpRequestInfo arpRequestInfo);
    }

    @StructLayout(LayoutKind.Sequential)
    public static class ArpRequestInfo extends Structure {
        // ... Define fields like dwSize, pEntryBuffer, ulArpRequestCount, etc.
    }
}