1?snmpGetDevicesTask方法

public static Map<String,CapEbu> snmpGetDevicesTask(List<String> ipList, List<String> oidList) {if(ipList==null||ipList.size()==0 || oidList==null || oidList.size()==0) return null;Map<String,CapEbu> ebuMap = new HashMap<String,CapEbu>();List<CapEbu> ebulist = new Vector<CapEbu>();int ipsSize = ipList.size();//ip段大小//指定循環次數，如果不指定循環次數且IP段大小是65536，那么線程池的一個任務就包含600多個ip，那么在極短時間內，當前任務會有一個監聽器線程，該線程可能會響應不過來，因為要處理600多個響應。//現在指定一次循環，線程池就只處理1000個ip,同時該循環中只向線程池發布100個任務，平均一個任務只處理10個ip。int cicleNumber = (ipsSize%ScanDeviceContants.DEAL_IPNUMBER == 0)?(ipsSize/ScanDeviceContants.DEAL_IPNUMBER):(ipsSize/ScanDeviceContants.DEAL_IPNUMBER+1);//創建線程執行器ThreadPoolExecutor executor = (ThreadPoolExecutor)Executors.newFixedThreadPool(ScanDeviceContants.THREADPOOL_SIZE);List<Future<List<CapEbu>>> resultList = new ArrayList<Future<List<CapEbu>>>();for(int cicle=0; cicle<cicleNumber; cicle++){List<String> iptemp = new ArrayList<String>();iptemp.addAll(ipList.subList(cicle*ScanDeviceContants.DEAL_IPNUMBER, cicle==cicleNumber-1?ipList.size():(cicle+1)*ScanDeviceContants.DEAL_IPNUMBER));//創建ip分配器AssignIps assignIps = new AssignIps(iptemp);for(int i=0; i<assignIps.getTaskSize(); i++){SnmpEbuTask snmpEbuTask = new SnmpEbuTask(assignIps.getAssignedIps(i),oidList);Future<List<CapEbu>> result = executor.submit(snmpEbuTask);resultList.add(result);snmpEbuTask = null;}System.out.println("CorePoolSize:"+executor.getCorePoolSize()+"---"+"MaximumPoolSize:"+executor.getMaximumPoolSize()+"-----LargestPoolSize:"+executor.getLargestPoolSize()+"-------PoolSize:"+executor.getPoolSize());executor.allowCoreThreadTimeOut(false);System.out.println("executor.getKeepAliveTime(TimeUnit.MILLISECONDS):"+executor.getKeepAliveTime(TimeUnit.NANOSECONDS));//直到所有任務都已完成，則停止循環do {try {TimeUnit.MILLISECONDS.sleep(500);System.out.println("線程活躍數量："+executor.getActiveCount());} catch (InterruptedException e) {e.printStackTrace();}} // while (executor.getCompletedTaskCount()<resultList.size()*(cicle+1)); while (executor.getActiveCount()!=0); System.out.println("線程活躍數量："+executor.getActiveCount()+"，執行器執行完的數量："+executor.getCompletedTaskCount());System.out.println("執行器"+(cicle+1)+"是否已終止："+executor.isTerminated());}executor.shutdown();//關閉線程執行器//所有任務已經完成，開始取出任務for (int i=0; i<resultList.size(); i++) {Future<List<CapEbu>> result=resultList.get(i);if(result.isDone()){try {List<CapEbu> ebus = result.get();if(ebus!=null&&ebus.size()>0){for(int j = 0 ; j < ebus.size() ; j++){if(!ebuMap.containsKey(ebus.get(j).getEbuIp())){ebuMap.put(ebus.get(j).getEbuIp(), ebus.get(j));System.out.println("放入map中,測試結果為 : ip = " + ebus.get(j).getEbuIp());}}} // ebulist.removeAll(ebus); // ebulist.addAll(ebus);} catch (InterruptedException e) {e.printStackTrace();} catch (ExecutionException e) {e.printStackTrace();}}} return ebuMap;}
2?SnmpEbuTask.java

import java.util.ArrayList; import java.util.List; import java.util.Vector; import java.util.concurrent.Callable; import java.util.concurrent.ConcurrentHashMap; import java.util.concurrent.TimeUnit;import org.snmp4j.CommunityTarget; import org.snmp4j.PDU; import org.snmp4j.Snmp; import org.snmp4j.event.ResponseEvent; import org.snmp4j.event.ResponseListener; 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;import com.nufront.euht.model.CapEbu; import com.nufront.euht.scanDevice.util.OidTranslatorUtil; import com.nufront.euht.util.Beans; import com.nufront.euht.util.StringUtil;public class SnmpEbuTask implements Callable<List<CapEbu>> {private int version = SnmpConstants.version2c;private String protocol = "udp";private int port = 161;private String community = "euhtpub";private List<String> ipsAddress;private List<String> oids;private List<CapEbu> capEbus = new Vector<CapEbu>();private Object lock = new Object();//同步鎖private int responseCounter = 0;//響應計數器private ConcurrentHashMap<String,Object> distinctIp = new ConcurrentHashMap<String,Object>();//ip響應去重器public SnmpEbuTask(List<String> ipsAddress, List<String> oids) {this.ipsAddress = ipsAddress;this.oids = oids;}private CommunityTarget createCommunityTarget(String address,String community, int version, long timeOut, int retry) {Address targetAddress = GenericAddress.parse(address);CommunityTarget target = new CommunityTarget();target.setCommunity(new OctetString(community));target.setAddress(targetAddress);target.setVersion(version);target.setTimeout(timeOut); // millisecondstarget.setRetries(retry);return target;}@Overridepublic List<CapEbu> call() throws Exception {String address = null;CommunityTarget target = null;DefaultUdpTransportMapping transport = null;Snmp snmp = null;try {transport = new DefaultUdpTransportMapping();transport.listen();snmp = new Snmp(transport);PDU pdu = new PDU();pdu.setType(PDU.GET);for (String oid : oids) {pdu.add(new VariableBinding(new OID(oid)));}ResponseListener listener = new ResponseListener() {public void onResponse(ResponseEvent event) {((Snmp) event.getSource()).cancel(event.getRequest(), this);PDU response = event.getResponse();PDU request = event.getRequest();System.out.println("[request]:" + request);String ip = null;if (Beans.isNotEmpty(event.getPeerAddress())) {ip = event.getPeerAddress().toString(); // 獲取IPif(!StringUtil.isNullOrBlank(ip)){ip = ip.split("/")[0];System.out.println("registerListener, ip=" + ip);}}if (response == null) {System.out.println("[ERROR]: response is null, ip is "+ip);} else if (response.getErrorStatus() != 0) {System.out.println("[ERROR]: response status"+ response.getErrorStatus() + " Text:"+ response.getErrorStatusText()+ " ip is "+ip);} else {if(ip.equals("192.168.22.226")){System.out.println();}System.out.println("Received response Success!!!"+" ip:"+ip);CapEbu capEbu = new CapEbu();capEbu.setEbuIp(ip);List<OidData> oidDatas = new ArrayList<OidData>();for (int i = 0; i < response.size(); i++) {VariableBinding vb = response.get(i);OidData oidData = new OidData();oidData.setOid(vb.getOid().toString());oidData.setValue(vb.getVariable().toString());oidDatas.add(oidData);}if(Beans.isNotEmpty(oidDatas) && oidDatas.size()>0){for(OidData oidData : oidDatas){OidTranslatorUtil.oidvalueConvertToName(oidData, capEbu);}}if(!distinctIp.containsKey(ip)){distinctIp.put(ip, new Object());capEbus.add(capEbu);System.out.println("capEbus.size():"+capEbus.size());}}synchronized (lock) {responseCounter++;System.out.println("responseCounter++:"+responseCounter);}}};for(int i=0; i<ipsAddress.size(); i++){address = protocol + ":" + ipsAddress.get(i) + "/" + port;target = createCommunityTarget(address, community, version, 1000L, 5);snmp.send(pdu, target, null, listener);System.out.println("asynchronous send pdu wait for response...");}long baselineTime = System.currentTimeMillis();while(responseCounter < ipsAddress.size()){long sendedTime = System.currentTimeMillis();//如果逗留時間超過5秒，有可能是網絡原因或者其他原因，導致響應不會到達監聽器，為避免死循環，則應馬上結束循環。if(sendedTime-baselineTime>5000){break;}TimeUnit.MILLISECONDS.sleep(1000);}return capEbus;} catch (Exception e) {System.out.println("SNMP GetNext Exception:" + e);}finally{snmp.close();//掃描結束后，得立刻關掉snmp，否則監聽器的線程將一直處于wait狀態，任務數過多的話，線程創建也將越來越多，最終導致系統崩潰transport.close();}return null;}}

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