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//ʹÓõ½µÄÀà
import java.io.IOException;
import java.net.InetAddress;
import java.net.UnknownHostException;
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;
//ÏÂÃæÖ»ÊÇÒ»¸ö·½·¨
public String getIpOfGateway(){
String gatewayIpString=null; //Íø¹ØipµØÖ·ÊÇÕâ¸ö×Ö·û´®µÄ×Ó´®
String gatewayIp=null; // ÕâÊÇ´ú±íÍø¹Øip
try {

/**
* Set properties of target
*/
CommunityTarget localhost = new CommunityTarget();
Address address = GenericAddress.parse("udp:127.0.0.1/161");
localhost.setAddress(address);
localhost.setCommunity(new OctetString("public"));
localhost.setRetries(2);
localhost.setTimeout(5*60);
localhost.setVersion(SnmpConstants.version2c);
/**
* Set protocols of UDP and SNMP
*/
TransportMapping transport = new DefaultUdpTransportMapping();
transport.listen();
Snmp protocol = new Snmp(transport);
/**
* OID binding
*/
PDU requestPDU = new PDU();
requestPDU.ad


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