先贴上自己的代码，以后在讲解，很幼稚的设计思路，只是个雏形，可贵的是完成了SNMPv123的测试
只有一个Main类：
import org.snmp4j.*;
import org.snmp4j.event.ResponseEvent;
import org.snmp4j.mp.MPv3;
import org.snmp4j.mp.SnmpConstants;
import org.snmp4j.security.*;
import org.snmp4j.smi.*;
import org.snmp4j.transport.DefaultUdpTransportMapping;
import org.snmp4j.util.DefaultPDUFactory;
import org.snmp4j.util.TableEvent;
import org.snmp4j.util.TableUtils;
import java.io.IOException;
import java.util.List;
import java.util.Scanner;
import java.util.Vector;
public class Main {
public static void main(String[] args) throws IOException {
Scanner input = new Scanner(System.in);
System.out.println("请设定snmp版本：");
int version = input.nextInt();
System.out.println("设定的snmp版本为：" + version);
if (1==version||2==version){
try {
Main a = new Main();
a.getRequest();
} catch (IOException e) {
e.printStackTrace();
}
}else if (3==version){
String nmsAdmin = "";
String AuthKey="";
String nmsPrivKey="";
String ip ="";
long timeout = 0;
int retry = 0;
Snmp snmp = new Snmp(new DefaultUdpTransportMapping());
USM usm = new USM(SecurityProtocols.getInstance(), new OctetString(MPv3.createLocalEngineID()), 0);
SecurityModels.getInstance().addSecurityModel(usm);
snmp.listen();
// 实例化user，并设置属性
Scanner set = new Scanner(System.in);
System.out.println("请输入检测对象的IP：");
ip = input.next();
System.out.println("请输入用户名称：");
nmsAdmin = set.next();
System.out.println("请输入认证秘钥：");
AuthKey = set.next();
System.out.println("请输入加密秘钥");
nmsPrivKey = set.next();
System.out.println("请设定超时时间：");
long timeout0 = input.nextInt();
timeout = timeout0 * 1000L;
System.out.println("设定的超时时间为：" + timeout0 + "秒");
System.out.println("请设定重试次数：");
retry = input.nextInt();
UsmUser user = new UsmUser(
new OctetString(nmsAdmin), // 安全名称
AuthMD5.ID, // 认证协议
new OctetString(AuthKey), // 认证秘钥
PrivDES.ID, // 加密算法
new OctetString(nmsPrivKey)); // 加密密钥
snmp.getUSM().addUser(new OctetString(nmsAdmin), user);
// 构造发送目标，SNMPv 1/2，实例化一个CommunityTarget对象。如果是SNMPv3，则需要实例化一个UserTarget对象。
UserTarget target = new UserTarget();
// 设置target
target.setVersion(SnmpConstants.version3); // 设置版本
target.setAddress(new UdpAddress(ip+"/161")); // 目的IP、端口号
target.setTimeout(timeout); // 等待延时
target.setRetries(retry); // 重试次数
target.setSecurityLevel(SecurityLevel.AUTH_PRIV); // 安全级别-v3特有
target.setSecurityName(new OctetString(nmsAdmin)); // 安全名称-v3特有
OctetString contextEngineId = new OctetString("0002651100[02]"); // 初始化上下文引擎ID
sendRequest(snmp, createGetPdu(contextEngineId), target); // 发送请求报文
snmpWalk(snmp, target, contextEngineId);
}
}
public void getRequest()throws IOException{
String protocol = "udp";
int port = 161;
String ip ="";
String community ="";
long timeout = 0;
int retry = 0;
Scanner input = new Scanner(System.in);
System.out.println("请输入检测对象的IP：");
ip = input.next();
System.out.println("检测对象IP：" + ip);
System.out.println("请输入community：");
community = input.next();
System.out.println("团体名：" + community);
System.out.println("请设定超时时间：");
long timeout0 = input.nextInt();
timeout = timeout0 * 1000L;
System.out.println("设定的超时时间为：" + timeout0 + "秒");
System.out.println("请设定重试次数：");
retry = input.nextInt();
System.out.println("设定的重试次数为：" + retry + "次");
System.out.println("选择要采集的对象：");
String oid = input.next();
//System.out.println("要采集的对象为：" + oid );
//创建对象transport
TransportMapping transport = new DefaultUdpTransportMapping();
//创建并初始化对象snmpClient
Snmp snmpClient = new Snmp(transport);
transport.listen();
//创建并初始化对象address
Address address = GenericAddress.parse(protocol+":"+ip+"/"+port);
//创建并初始化对象target
Target target = new CommunityTarget(address,new OctetString(community));
//对象调用方法，来设置SNMP版本-version2c、尝试次数、超时时间
target.setVersion(SnmpConstants.version2c);
target.setRetries(retry);
target.setTimeout(timeout);
//创建对象request
PDU request = new PDU();
//设置类型-GET
request.setType(PDU.GET);
//添加OID
request.add(new VariableBinding(new OID(oid)));
//创建并初始化对象:响应事件
ResponseEvent respEvent = snmpClient.send(request,target);
//创建对象response接收响应
PDU response = respEvent.getResponse();
if (null!=response){
if (response.size()>0){
//创建对象变量，来接收响应结果
VariableBinding vbi = response.get(0);
System.out.println("采集结果为:"+vbi.getVariable().toString());
}
}
}
private static PDU createGetPdu(OctetString contextEngineId) {
ScopedPDU pdu = new ScopedPDU(); // 构造pdu
pdu.setType(PDU.GET); // 设置请求类型
pdu.setContextEngineID(contextEngineId); // 如果不设置, 将会是SNMP引擎ID
//pdu.setContextName(contextName); // 设置上下文名称，必须和代理的一样
//设置OID，即要访问的对象
pdu.add(new VariableBinding(new OID("1.3.6.1.2.1.1.3.0"))); // sysUpTime
pdu.add(new VariableBinding(new OID("1.3.6.1.2.1.1.5.0"))); // sysName
pdu.add(new VariableBinding(new OID("1.3.6.1.2.1.1.5"))); // expect an no_such_instance error
return pdu;
}
/*
* 同步模式发送消息后便等待响应的到达，到达之后会返回一个ResponseEvent对象，该对象中包含了响应的相应信息。
* 异步模式发送消息之后便会继续执行，当收到响应消息时便会调用监听对象的OnResponse函数。
*/
private static void sendRequest(Snmp snmp, PDU pdu, UserTarget target)
throws IOException {
ResponseEvent responseEvent = snmp.send(pdu, target); // 将pdu发送给target，返回一个response
PDU response = responseEvent.getResponse(); // 返回的response
if (response == null) { // 如果response为空
System.out.println("TimeOut...");
} else { // 如果response不为空
if (response.getErrorStatus() == PDU.noError) {
Vector<? extends VariableBinding> vbs = response.getVariableBindings();
for (VariableBinding vb : vbs) {
System.out.println(vb + " ," + vb.getVariable().getSyntaxString());
}
} else {
System.out.println("Error:" + response.getErrorStatusText());
}
}
}
private static void snmpWalk(Snmp snmp, UserTarget target, OctetString contextEngineId) {
TableUtils utils = new TableUtils(snmp,
new MyDefaultPDUFactory(PDU.GETNEXT, //GETNEXT or GETBULK)
contextEngineId));
utils.setMaxNumRowsPerPDU(5); //only for GETBULK, set max-repetitions, default is 10
OID[] columnOids = new OID[] {
new OID("1.3.6.1.2.1.1.9.1.2"), //sysORID
new OID("1.3.6.1.2.1.1.9.1.3") //sysORDescr
};
// If not null, all returned rows have an index in a range (lowerBoundIndex, upperBoundIndex]
List<TableEvent> l = utils.getTable(target, columnOids, new OID("3"), new OID("10"));
for (TableEvent e : l) {
System.err.println(e);
}
}
private static class MyDefaultPDUFactory extends DefaultPDUFactory {
private OctetString contextEngineId = null;
public MyDefaultPDUFactory(int pduType, OctetString contextEngineId) {
super(pduType);
this.contextEngineId = contextEngineId;
}
@Override
public PDU createPDU(Target target) {
PDU pdu = super.createPDU(target);
if (target.getVersion() == SnmpConstants.version3) {
((ScopedPDU) pdu).setContextEngineID(contextEngineId);
}
return pdu;
}
}
}
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