最近在公司做网管系统,时常要用到snmp协议去获取设备的性能。公司的snmpUtil类不知道是哪个大佬封装的,从创建snmp协议到创建PDU以至于具体的方法,都在与一个实体类进行绑定。我在使用的过程中,由于业务的需要,不需要那个实体类,因此,越看越不顺眼。在csdn上搜了一下,网上的一些大佬写的,感觉还是可扩展性我还是不太满意。由于业务的需要,有时候要遍历oid以及它的所有子节点,有时候需要获取单个oid对应的值,有时候是根据oid数组获取一个对应的表。因此,我越来越渴望有一个可扩展的snmpUtil工具类。于是乎,我花费了一些时间,研究了一下,最终抽象出了一些snmp工具类。
<dependency>
<groupId>org.snmp4j</groupId>
<artifactId>snmp4j</artifactId>
<version>2.5.8</version>
</dependency>
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.snmp4j.*;
import org.snmp4j.event.ResponseEvent;
import org.snmp4j.mp.MPv1;
import org.snmp4j.mp.MPv2c;
import org.snmp4j.mp.SnmpConstants;
import org.snmp4j.security.SecurityLevel;
import org.snmp4j.security.SecurityModel;
import org.snmp4j.smi.*;
import org.snmp4j.transport.DefaultUdpTransportMapping;
import java.io.IOException;
import java.util.*;
/**
* @author XPAN
* @description: TODO
* @date 2022/9/26 17:37
*/
public class mySnmpUtil3 {
private static final Logger logger = LogManager.getLogger(mySnmpUtil3.class);
private static Snmp snmp = null;
private CommunityTarget target;
//传入要查询的主机ip
private String hostIp;
//传入要查询的端口号
private String hostPort;
//传入要查询的团体名
private String community ;
//接收要查询的oids
private String oid;
public String getHostIp() {
return hostIp;
}
public void setHostIp(String hostIp) {
this.hostIp = hostIp;
}
public String getHostPort() {
return hostPort;
}
public void setHostPort(String hostPort) {
this.hostPort = hostPort;
}
public String getCommunity() {
return community;
}
public void setCommunity(String community) {
this.community = community;
}
private String addressGet ;
//获取设备描述信息
private String healthOID1 = "1.3.6.1.4.1";
//设备电源状态
String healthOID2 = "1.3.6.1.";
//获取系统温度
private String healthOID3 = "1.3.6.";
public mySnmpUtil3(String hostIp,String hostPort, String snmpCommunity,String oid){
this.setHostIp(hostIp);
this.setHostPort(hostPort);
this.setCommunity(snmpCommunity);
this.oid = oid;
}
public void initSnmp() throws IOException {
snmp = new Snmp(new DefaultUdpTransportMapping());
//开启监听
snmp.listen();
}
private Target createTarget(String oid) {
//先得到连接的ip和端口号
this.addressGet = "udp:" + this.getHostIp()+"/"+this.getHostPort();
Target target = null;
int version = 1;
if (!(version == SnmpConstants.version3 || version == SnmpConstants.version2c || version == SnmpConstants.version1)) {
//log.error("参数version异常");
return target;
}
// if (version == SnmpConstants.version3) {
// target = new UserTarget();
// //snmpV3需要设置安全级别和安全名称,其中安全名称是创建snmp指定user设置的new OctetString("SNMPV3")
// target.setSecurityLevel(SecurityLevel.AUTH_PRIV);
// target.setSecurityName(new OctetString(this.username));
// } else
{
//snmpV1和snmpV2需要指定团体名名称
target = new CommunityTarget();
((CommunityTarget) target).setCommunity(new OctetString(this.community));
if (version == SnmpConstants.version2c) {
target.setSecurityModel(SecurityModel.SECURITY_MODEL_SNMPv2c);
}
}
target.setVersion(version);
//必须指定,没有设置就会报错。
target.setAddress(GenericAddress.parse(this.addressGet));
target.setRetries(3);
target.setTimeout(2000);
return target;
}
private static PDU createPDU(int version, int type, String oid) {
PDU pdu = null;
if (version == SnmpConstants.version3) {
pdu = new ScopedPDU();
} else {
pdu = new PDUv1();
}
pdu.setType(type);
//可以添加多个变量oid
/*for(String oid:oids){
pdu.add(new VariableBinding(new OID(oid)));
}*/
pdu.add(new VariableBinding(new OID(oid)));
return pdu;
}
/**
* 这个方法有大用处,有时候我们查出的数据是35:32:30:30:30:30:30:30:30:31:31:37:31:30:32类似于这种格式,然后我们需要把它转为用户可识别的格式,就用它
* @param octestString
* @return
*/
public static String getChinese(String octestString){
try{
String[] temps = octestString.split(":");
byte[] bs = new byte[temps.length];
for (int j=0;j< temps.length;j++){
bs[j] = (byte)Integer.parseInt(temps[j],16);
}
return new String(bs,"GB2312");
}catch (Exception e){
return octestString;
}
}
/**
* WALK方式请求
*功能简介:这个方法是getnext,就是遍历该oid下的所有子节点
*/
public List<Map<String,Object>> snmpWalk() {
try {
List<Map<String,Object>> list = new ArrayList<>();
//1、初始化snmp,并开启监听
initSnmp();
//2、创建目标对象
Target target = createTarget(this.oid);
//3、创建报文
PDU pdu = createPDU(2, PDU.GETNEXT, this.oid);
//4、发送报文,并获取返回结果
boolean matched = true;
while (matched) {
ResponseEvent responseEvent = snmp.send(pdu, target);
if (responseEvent == null || responseEvent.getResponse() == null) {
//LogUtil.info("snmp TimeOut...");
break;
}
PDU response = responseEvent.getResponse();
String nextOid = null;
Vector<? extends VariableBinding> variableBindings = response.getVariableBindings();
for (int i = 0; i < variableBindings.size(); i++) {
VariableBinding variableBinding = variableBindings.elementAt(i);
Variable variable = variableBinding.getVariable();
nextOid = variableBinding.getOid().toDottedString();
//如果不是这个节点下的oid则终止遍历,否则会输出很多,直到整个遍历完。
if (!nextOid.startsWith(oid)) {
matched = false;
break;
}
Map<String,Object> map = new HashMap();
//放入oid以及oid对应获得的值
map.put(nextOid,variable);
list.add(map);
}
if (!matched) {
break;
}
pdu.clear();
pdu.add(new VariableBinding(new OID(nextOid)));
}
System.out.println("list的大小 = " +list.size());
return list;
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return null;
}
/**
* 功能简介:获取单个节点oid对应的值
* @throws IOException
*/
public void snmpGet( ) throws IOException {
try {
//1、初始化snmp,并开启监听
initSnmp();
//2、创建目标对象
Target target = createTarget(this.oid);
//3、创建报文
PDU pdu = createPDU(2, PDU.GET, this.oid);
//4、发送报文,并获取返回结果
ResponseEvent responseEvent = snmp.send(pdu, target);
PDU response = responseEvent.getResponse();
if (response == null) {
System.out.println("response is null, request time out");
} else {
System.out.println("response pdu size is " + response.size());
for (int i = 0; i < response.size(); i++) {
VariableBinding vb = response.get(i);
System.out.println(vb.getOid() + " = " + vb.getVariable());
}
}
System.out.println("SNMP GET one OID value finished !");
} catch (Exception e) {
e.printStackTrace();
System.out.println("SNMP Get Exception:" + e);
} finally {
if (snmp != null) {
try {
snmp.close();
} catch (IOException ex1) {
snmp = null;
}
}
}
}
//开启监控的main方法。
public static void main(String[] args) throws IOException {
// mySnmpUtil3 mySnmpUtil = new mySnmpUtil3("127.0.0.1","161","tuantiming","1.3.6.1.4.1");
// mySnmpUtil.snmpGet();
//下面这个方法需要有子节点,遍历子节点然后从子节点中拿数据,这里是找华为的实体索引
mySnmpUtil3 mySnmpUtil = new mySnmpUtil3("127.0.0.1","161","tuantiming","1.3.6.1.2.1.47.1.1.1.1.5");
List<Map<String, Object>> mapList = mySnmpUtil.snmpWalk();
Map<String,Integer> result = new HashMap<String,Integer>();
int flat= 0;
List<String> resultNeed = new ArrayList<>();
for (Map<String, Object> map: mapList){
for (String key:map.keySet()){
System.out.println("key= "+key +" value= "+ map.get(key));
//华为
if (String.valueOf(map.get(key)).equals("9")){
String substring = key.substring(25, key.length());
resultNeed.add(substring);
System.out.println("找到我需要的数据了"+substring+"9");
break;
}
}
}
System.out.println("这是我需要的数据"+resultNeed.get(0));
}
}
最后,这里的System.out要记得在生产环境换成Log或者给直接去掉。这里先暂时放这两种方法,后面如果业务需要了再更新。