我怎样才能在Java中嗅探网络流量？ [英] How could I sniff network traffic in Java?

问题描述

我只是四处寻找如何制作一个能用Java嗅探网络流量的程序，但我找不到任何东西。我想知道是否有任何方法可以查看网络流量。我听说过 Socket 的想法，但我不明白这会怎么样。所以无论如何，只是寻找API或自己编写的方式。

I was just looking around to find out how to make a program that would sniff my network traffic in Java, but I couldn't find anything. I wanted to know if there was any way to view the network traffic going by. I heard of an idea with a Socket, but I don't get how that would work. So anyways, just looking for an API or a way to write it myself.

编辑：
我很乐意喜欢API ，但我还想澄清一下使用Socket嗅探流量的方法。

I would gladly like an API, but I would also like clarification on the way to sniff traffic with a Socket.

推荐答案

jpcap ， jNetPcap - 这些是Java中的pcap包装项目。

jpcap, jNetPcap -- those are pcap wrapper projects in Java.

Kraken - 类似项目，记录详尽有很多例子。

Kraken -- similar project, well documented with lots of examples.

来自Kraken网站的简单示例：

simple example from the Kraken web site:

public static void main(String[] args) throws Exception {
    File f = new File("sample.pcap");

    EthernetDecoder eth = new EthernetDecoder();
    IpDecoder ip = new IpDecoder();
    TcpDecoder tcp = new TcpDecoder(new TcpPortProtocolMapper());
    UdpDecoder udp = new UdpDecoder(new UdpPortProtocolMapper());

    eth.register(EthernetType.IPV4, ip);
    ip.register(InternetProtocol.TCP, tcp);
    ip.register(InternetProtocol.UDP, udp);

    PcapInputStream is = new PcapFileInputStream(f);
    while (true) {
        // getPacket() will throws EOFException and you should call is.close() 
        PcapPacket packet = is.getPacket();
        eth.decode(packet);
    }
}

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