专业级的SNMP框架---SNMP4J

时间：2010-11-23 来源：zhengdong1987

专业级的SNMP框架---SNMP4J

SNMP4J简介

相比SNMP PACKAGE API 比较低的门槛和简单的功能,SNMP4J则是完全专业级的框架.他的SNMP-TARGET-PDU的三点结构更科学更严谨,完善的PDU数据引擎也是业界的一种潮流.SNMP4J的强大体现在他对SNMPV3标准下基于用户安全（USM）方式的认证,加密,和对Agent功能的强大支持.

SNMP4J基本GET和GETNEXT功能

1.先建立一个工具类,主要是对SNMP,TARGET,PDU的三个SNMP4J基本类的实例化
注:出于简化,本例去掉了SNMPV3的支持,以下代码只支持SNMPV1和SNMPV2C

public class Snmp4JHelper {


    public static Snmp createSnmpSession(Address address) throws IOException {

        // new TransportMapping object
        AbstractTransportMapping transport;
        if (address instanceof TcpAddress) {
          transport = new DefaultTcpTransportMapping();
        }
        else {
          transport = new DefaultUdpTransportMapping();
        }

        // new Snmp object
        Snmp snmp = new Snmp(transport);

        return snmp;
    }

    public static Target createTarget(Address address,OctetString community) {

          CommunityTarget target = new CommunityTarget();

          target.setAddress(address);
          target.setCommunity(community);
          return target;

    }

    public static PDU createPDU(int pduType) {

        PDU request;

          if (pduType == PDU.V1TRAP) {
            request = new PDUv1();
          }
          else {
            request = new PDU();
          }

          request.setType(pduType);
        return request;
    }

几个工具方法

    public static OctetString createOctetString(String s) {
        OctetString octetString;
        if (s.startsWith("0x")) {
          octetString = OctetString.fromHexString(s.substring(2), ':');
        }
        else {
          octetString = new OctetString(s);
        }
        return octetString;
    }

    public static Address getAddress(String transportAddress) {

            // 如果有冒号存在,就是"udp:xxx.xxx.xxx.xxx"的格式,分离出协议和地址
            int colon = transportAddress.indexOf(':');
            String transprotocol = "udp";
            if (colon > 0) {
              transprotocol = transportAddress.substring(0, colon);
              transportAddress = transportAddress.substring(colon+1);
            }

            // append default port follow end of transportAddress
            if (transportAddress.indexOf('/') < 0) {
              transportAddress += "/161";
            }

            if (transprotocol.equalsIgnoreCase("udp")) {
              retur