java 网络抓包 源码
时间: 2023-11-01 12:08:35 浏览: 132
以下是使用Java进行网络抓包的示例代码:
```java
import java.io.IOException;
import java.net.InetAddress;
import java.net.UnknownHostException;
import java.nio.ByteBuffer;
import java.nio.channels.SelectionKey;
import java.nio.channels.Selector;
import java.nio.channels.SocketChannel;
import java.util.Arrays;
import java.util.Iterator;
public class NetworkCapture {
private Selector selector;
public NetworkCapture() throws IOException {
this.selector = Selector.open();
}
public void capture(String hostname, int port) throws UnknownHostException, IOException {
InetAddress address = InetAddress.getByName(hostname);
SocketChannel channel = SocketChannel.open();
channel.configureBlocking(false);
channel.connect(address, port);
channel.register(selector, SelectionKey.OP_CONNECT);
while (selector.select() > 0) {
Iterator<SelectionKey> iterator = selector.selectedKeys().iterator();
while (iterator.hasNext()) {
SelectionKey key = iterator.next();
iterator.remove();
if (key.isConnectable()) {
SocketChannel sc = (SocketChannel) key.channel();
if (sc.finishConnect()) {
key.interestOps(SelectionKey.OP_READ);
}
} else if (key.isReadable()) {
SocketChannel sc = (SocketChannel) key.channel();
ByteBuffer buffer = ByteBuffer.allocate(1024);
int bytesRead = sc.read(buffer);
if (bytesRead == -1) {
key.cancel();
sc.close();
break;
}
buffer.flip();
byte[] bytes = new byte[buffer.limit()];
buffer.get(bytes);
System.out.println(Arrays.toString(bytes));
}
}
}
}
public static void main(String[] args) throws UnknownHostException, IOException {
NetworkCapture capture = new NetworkCapture();
capture.capture("www.google.com", 80);
}
}
```
这个示例代码使用Java NIO实现了网络抓包。它连接到指定的主机和端口,并读取所有传入的数据。在读取到数据时,它将字节数组打印到控制台上。你可以根据需要修改这个示例代码,以适应你的特定需求。
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