枚举类根据values()获取枚举实例

超、凢脫俗 2022-04-02 17:10 322阅读 0赞

一般的枚举类，我们只写对应的get set方法， 要拿取每个字段的值必须先确认枚举实例

这里运用枚举类的values方法，循环判断实例的值，获取到对应的实例

参照方法getEventStatus（int value）

import org.apache.commons.lang3.EnumUtils;
    
    import java.beans.PropertyDescriptor;
    import java.lang.reflect.Field;
    import java.lang.reflect.InvocationTargetException;
    import java.lang.reflect.Method;
    
    
    public enum EventStatus {
    
        LAUNCHED(0, "待处理","发起"),
        ACCEPTED(1, "处理中","认领"),
        REJECTED(2, "待验收","打回"),
        TRANSFERRED(3, "处理中","转交"),
        RESOLVED(4, "待验收","解决"),
        CLOSED(5, "已关闭","关闭");
    
        private int value;
        private String description;//事件状态
        private String operateType;//用户操作类型
    
        EventStatus(int value, String description,String operateType) {
            this.value = value;
            this.description = description;
            this.operateType=operateType;
        }
    
        public static String getValueName(int intValue) {
            return getNameByValue(intValue,"description");
        }
    
        public static String getOperateName(int intValue) {
            return getNameByValue(intValue,"operateType");
        }
    
        public static  String getNameByValue(int intValue, String propertyName){
            EventStatus[] arr$ = values();
            int len$ = arr$.length;
    
            for(int i$ = 0; i$ < len$; ++i$) {
                EventStatus t = arr$[i$];
                if (intValue == t.getValue()) {
                    return String.valueOf(dynamicGet(t,propertyName));
                }
            }
    
            return "";
        }
    
        private static Object dynamicGet(EventStatus t, String propertyName) {
            try {
                Class clazz=t.getClass();
    //            Field field = clazz.getDeclaredField(propertyName);
                PropertyDescriptor pd = new PropertyDescriptor(propertyName,
                        clazz);
                Method getMethod = pd.getReadMethod();//获得get方法
                Object o = getMethod.invoke(t);//执行get方法返回一个Object
                return o;
            } catch (Exception e) {
                e.printStackTrace();
            }
            return "";
        }
    
        public static EventStatus getEventStatus(int value){
            EventStatus[] arr$=values();
            int len$ = arr$.length;
    
            for(int i$ = 0; i$ < len$; ++i$) {
                EventStatus status = arr$[i$];
                if (status.getValue()==value) {
                    return status;
                }
            }
    
            return null;
        }
    
        public int getValue() {
            return value;
        }
    
        public void setValue(int value) {
            this.value = value;
        }
    
        public String getDescription() {
            return description;
        }
    
        public void setDescription(String description) {
            this.description = description;
        }
    
        public String getOperateType() {
            return operateType;
        }
    
        public void setOperateType(String operateType) {
            this.operateType = operateType;
        }
    
        public static void main(String[] args) {
            System.out.println(EventStatus.getEventStatus(0).getDescription());;
            System.out.println(getNameByValue(0,"description"));
        }
    }