利用SNMP4J實現Snmp Trap

下面是兩個用於發送和接收Trap報文信息的類:

import java.io.IOException;
import java.net.UnknownHostException;
import java.util.Vector;

import org.snmp4j.CommandResponder;
import org.snmp4j.CommandResponderEvent;
import org.snmp4j.MessageDispatcherImpl;
import org.snmp4j.Snmp;
import org.snmp4j.TransportMapping;
import org.snmp4j.mp.MPv1;
import org.snmp4j.mp.MPv2c;
import org.snmp4j.mp.MPv3;
import org.snmp4j.security.SecurityModels;
import org.snmp4j.security.SecurityProtocols;
import org.snmp4j.security.USM;
import org.snmp4j.smi.Address;
import org.snmp4j.smi.GenericAddress;
import org.snmp4j.smi.OctetString;
import org.snmp4j.smi.TcpAddress;
import org.snmp4j.smi.UdpAddress;
import org.snmp4j.smi.VariableBinding;
import org.snmp4j.transport.DefaultTcpTransportMapping;
import org.snmp4j.transport.DefaultUdpTransportMapping;
import org.snmp4j.util.MultiThreadedMessageDispatcher;
import org.snmp4j.util.ThreadPool;

/**
 * 本類用於監聽代理進程的Trap信息
 *
 * @author zhanjia
 *
 */
public class MultiThreadedTrapReceiver implements CommandResponder {

    private MultiThreadedMessageDispatcher dispatcher;
    private Snmp snmp = null;
    private Address listenAddress;
    private ThreadPool threadPool;

    public MultiThreadedTrapReceiver() {
        // BasicConfigurator.configure();
    }

    private void init() throws UnknownHostException, IOException {
        threadPool = ThreadPool.create("Trap", 2);
        dispatcher = new MultiThreadedMessageDispatcher(threadPool,
                new MessageDispatcherImpl());
        listenAddress = GenericAddress.parse(System.getProperty(
                "snmp4j.listenAddress", "udp:192.168.1.23/162")); // 本地IP與監聽端口
        TransportMapping transport;
        // 對TCP與UDP協議進行處理
        if (listenAddress instanceof UdpAddress) {
            transport = new DefaultUdpTransportMapping(
                    (UdpAddress) listenAddress);
        } else {
            transport = new DefaultTcpTransportMapping(
                    (TcpAddress) listenAddress);
        }
        snmp = new Snmp(dispatcher, transport);
        snmp.getMessageDispatcher().addMessageProcessingModel(new MPv1());
        snmp.getMessageDispatcher().addMessageProcessingModel(new MPv2c());
        snmp.getMessageDispatcher().addMessageProcessingModel(new MPv3());
        USM usm = new USM(SecurityProtocols.getInstance(), new OctetString(MPv3
                .createLocalEngineID()), 0);
        SecurityModels.getInstance().addSecurityModel(usm);
        snmp.listen();
    }


    public void run() {
        try {
            init();
            snmp.addCommandResponder(this);
            System.out.println("開始監聽Trap信息!");
        } catch (Exception ex) {
            ex.printStackTrace();
        }
    }

    /**
     * 實現CommandResponder的processPdu方法, 用於處理傳入的請求、PDU等信息
     * 當接收到trap時，會自動進入這個方法
     *
     * @param respEvnt
     */
    public void processPdu(CommandResponderEvent respEvnt) {
        // 解析Response
        if (respEvnt != null && respEvnt.getPDU() != null) {
            Vector<VariableBinding> recVBs = respEvnt.getPDU().getVariableBindings();
            for (int i = 0; i < recVBs.size(); i++) {
                VariableBinding recVB = recVBs.elementAt(i);
                System.out.println(recVB.getOid() + " : " + recVB.getVariable());
            }
        }
    }

    public static void main(String[] args) {
        MultiThreadedTrapReceiver multithreadedtrapreceiver = new MultiThreadedTrapReceiver();
        multithreadedtrapreceiver.run();
    }

}