• 上代码：

  @Getter
  public enum NodeIdStatusRef {
  
    /**
     * reference
     */
    NI001_A001_AGREE(NodeIdEnum.NI001.getNodeId(), OrderStatus.A101.getCode(), OrderStatus.A101.getCode()),
    NI001_A001_REJECT(NodeIdEnum.NI002.getNodeId(), OrderStatus.A102.getCode(), OrderStatus.A102.getCode()),
    NI001_A002(NodeIdEnum.NI002.getNodeId(), OrderStatus.A102.getCode(), null),
    ;
  
    /**
     * 节点ID
     */
    private String nodeId;
    /**
     * 审批通过对应的状态
     */
    private String agreeStatus;
    /**
     * 审批拒绝对应的状态
     */
    private String rejectStatus;
  
    NodeIdStatusRef(String nodeId, String agreeStatus, String rejectStatus) {
        this.nodeId = nodeId;
        this.agreeStatus = agreeStatus;
        this.rejectStatus = rejectStatus;
    }
  
    /**
     * 操作类型
     */
    private String opType;
  
    /**
     * 根据nodeId和操作类型查对应状态
     *
     * @param nodeId 节点ID
     * @param opType 操作类型
     * @return 对应状态
     */
    public static String lookupStatusByOpType(String nodeId, String opType) {
        String status = null;
        for (NodeIdStatusRef item : NodeIdStatusRef.values()) {
            if (nodeId.equals(item.getNodeId())) {
                if (TopcarConstants.APPROVE_RESULT_CODE_AGREE.equals(opType)) {
                    status = item.getAgreeStatus();
                } else if (TopcarConstants.APPROVE_RESULT_CODE_REJECT.equals(opType)) {
                    status = item.getRejectStatus();
                }
            }
        }
        return status;
    }

  这个类需要以下两个枚举类：用来做参照，上面这个枚举类的方法是做的参照，提供调用方法【lookupStatusByOpType（根据节点id和操作类型，返回对应状态）】，入参是操作类型和节点ID

  /**
  * Notice: 节点ID枚举类
  */
  @Getter
  @AllArgsConstructor
  public enum NodeIdEnum {
    /**
     * nodeId
     */
    NI001("TaskNode_d8lv3","资管公司初审"),
    NI002("TaskNode_etu76","资管公司复审"),
    NI003("TaskNode_hlmgj","国银初审"),
    NI004("TaskNode_lftzv","国银复审"),
    NI005("TaskNode_apqg5","资管公司请款初审"),
    NI006("TaskNode_r2nxp","资管公司请款复审"),
    NI007("TaskNode_bhbol","国银请款初审"),
    NI008("TaskNode_s48j9","国银请款复审"),
        ;
    /**
     * 节点ID
     */
    private String nodeId;
    /**
     * 描述
     */
    private String desc;
  }

  /**
  * Notice: 订单状态
  */
  @Getter
  @AllArgsConstructor
  public enum OrderStatus {
    /**
     * 枚举定义
     */
    A101("101", "等待风控报告"),
    A102("102", "自动审批通过"),
    A103("103", "自动审批拒绝"),
    A104("104", "资管公司风控审批"),
    A105("105", "国银风控审批"),
    A106("106", "风控审批前取消"),
    A107("107", "等待补充合同信息"),
    A108("108", "风控审批后取消"),
    A109("109", "等待客户签约"),
    A110("110", "客户签约取消"),
    A111("111", "等待渠道请款"),
    A112("112", "资管公司请款审批"),
    A113("113", "国银请款审批"),
    A114("114", "请款取消"),
    A115("115", "取消付款"),
    A116("116", "风控前拒绝"),
    A117("117", "风控后拒绝"),
    ;
    private String code;
    private String desc;
  }

枚举类转Map 参考[原文](http://fokman.iteye.com/blog/1568905)

public enum IdeasCMD {  
    RESERVED(0), PING(1), PING_ACK(2), KEY_EXCHANGE(3), KEY_EXCHANGE_ACK(4), CONNECT(5), CONNECT_ACK(6), DISCONNECT(7), KEEP_ALIVE(  
            8), KEEP_ALIVE_ACK(9)   ;  

    private final int value;  

    /** 
     * enum lookup map 
     */  
    private static final Map<Integer, IdeasCMD> lookup = new HashMap<Integer, IdeasCMD>();  

    static {  
        for (IdeasCMD s : EnumSet.allOf(IdeasCMD.class)) {  
            lookup.put(s.getValue(), s);  
        }  
    }  

    IdeasCMD(int value) {  
        this.value = value;  
    }  

    public int getValue() {  
        return value;  
    }  

    public static IdeasCMD lookup(int value) {  
        return lookup.get(value);  
    }  
}