如何配置引擎ID以使用SNMP4J发送SNMP陷阱V3？

import org.snmp4j.*;
import org.snmp4j.mp.*;
import org.snmp4j.security.*;
import org.snmp4j.smi.*;
import org.snmp4j.transport.*;

public class SNMPTrapSender {

    public static void main(String[] args) throws Exception {
        // 设置引擎ID
        OctetString engineID = new OctetString("800007d303000000000000");

        // 创建SNMPv3用户
        USM usm = new USM(SecurityProtocols.getInstance(), engineID, 0);
        usm.addUser(new OctetString("username"), new UsmUser(new OctetString("username"),
                AuthMD5.ID, new OctetString("authPassword"), PrivDES.ID, new OctetString("privPassword")));

        // 创建SNMP实例
        Snmp snmp = new Snmp(new DefaultUdpTransportMapping());
        snmp.getMessageDispatcher().addMessageProcessingModel(new MPv3(usm));

        // 设置引擎ID和用户
        snmp.setLocalEngine(engineID.getValue(), 0, 0);
        snmp.getUSM().addUser(engineID, new UsmUser(new OctetString("username"),
                AuthMD5.ID, new OctetString("authPassword"), PrivDES.ID, new OctetString("privPassword")));

        // 配置陷阱目标
        Address targetAddress = new UdpAddress("127.0.0.1/162");
        UserTarget target = new UserTarget();
        target.setAddress(targetAddress);
        target.setVersion(SnmpConstants.version3);
        target.setSecurityLevel(SecurityLevel.AUTH_PRIV);
        target.setSecurityName(new OctetString("username"));

        // 创建SNMP陷阱
        PDU pdu = new PDU();
        pdu.setType(PDU.TRAP);
        pdu.add(new VariableBinding(SnmpConstants.sysUpTime));
        pdu.add(new VariableBinding(SnmpConstants.snmpTrapOID, new OID("1.3.6.1.4.1.1234.0")));
        pdu.add(new VariableBinding(new OID("1.3.6.1.2.1.1.1.0"), new OctetString("Test trap")));

        // 发送SNMP陷阱
        snmp.send(pdu, target, null, null);
    }
}