接收Trap報文資訊的類:：

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;

/**
 * 本類用於監聽代理程序的Trap資訊
 * 
 * @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與監聽埠
		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資訊!");
		} catch (Exception ex) {
			ex.printStackTrace();
		}
	}

	/**
	 * 實現CommandResponder的processPdu方法, 用於處理傳入的請求、PDU等資訊
	 * 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 = (Vector<VariableBinding>)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();
	}

}
 

傳送Trap報文資訊的類:

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

import org.snmp4j.CommunityTarget;
import org.snmp4j.PDU;
import org.snmp4j.Snmp;
import org.snmp4j.TransportMapping;
import org.snmp4j.event.ResponseEvent;
import org.snmp4j.mp.SnmpConstants;
import org.snmp4j.smi.Address;
import org.snmp4j.smi.GenericAddress;
import org.snmp4j.smi.OID;
import org.snmp4j.smi.OctetString;
import org.snmp4j.smi.VariableBinding;
import org.snmp4j.transport.DefaultUdpTransportMapping;

/**
 * 本類用於向管理程序傳送Trap資訊
 * 
 * @author zhanjia
 *
 */
public class SnmpUtilSendTrap {

	private Snmp snmp = null;

	private Address targetAddress = null;

	public void initComm() throws IOException {

		// 設定管理程序的IP和埠
		targetAddress = GenericAddress.parse("udp:192.168.1.23/162");
		TransportMapping transport = new DefaultUdpTransportMapping();
		snmp = new Snmp(transport);
		transport.listen();

	}

	/**
	 * 向管理程序傳送Trap報文
	 * 
	 * @throws IOException
	 */
	public void sendPDU() throws IOException {

		// 設定 target
		CommunityTarget target = new CommunityTarget();
		target.setAddress(targetAddress);

		// 通訊不成功時的重試次數
		target.setRetries(2);
		// 超時時間
		target.setTimeout(1500);
		// snmp版本
		target.setVersion(SnmpConstants.version2c);

		// 建立 PDU
		PDU pdu = new PDU();
		pdu.add(new VariableBinding(new OID(".1.3.6.1.2.3377.10.1.1.1.1"),
				new OctetString("SnmpTrap")));
		pdu.add(new VariableBinding(new OID(".1.3.6.1.2.3377.10.1.1.1.2"),
				new OctetString("JavaEE")));
		pdu.setType(PDU.TRAP);

		// 向Agent傳送PDU，並接收Response
		ResponseEvent respEvnt = snmp.send(pdu, target);

		// 解析Response
		if (respEvnt != null && respEvnt.getResponse() != null) {
			Vector<VariableBinding> recVBs = (Vector<VariableBinding>) respEvnt.getResponse().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) {
		try {
			SnmpUtilSendTrap util = new SnmpUtilSendTrap();
			util.initComm();
			util.sendPDU();
		} catch (IOException e) {
			e.printStackTrace();
		}
	}

}
 

1、執行MultiThreadedTrapReceiver類，提示“開始監聽Trap資訊!”並處理監聽狀態

2、執行SnmpUtilSendTrap類，執行完畢後，將會在“開始監聽Trap資訊!”後面顯示：

1.3.6.1.2.3377.10.1.1.1.1 : SnmpTrap
1.3.6.1.2.3377.10.1.1.1.2 : JavaEE

MultiThreadedTrapReceiver輸出面板中顯示以上兩行即表示測試成功！

說明：

      本例只在本人電腦上測試過，作業系統為Windows