Java反射遍歷判斷值是否屬於枚舉類Enum

今天在開發的時候遇到一個判斷需求：判斷一個值是否屬於枚舉類。之前寫的話都是通過在if裏面寫上|| 或來連接 或者爲每個枚舉Enum寫一個遍歷判斷的方法。後來想了一下實在太麻煩了，加入枚舉類改變的話業務代碼的判斷也需要改變比較麻煩，工具類也沒找到相關的，於是自己通過反射寫了一個循環遍歷判斷枚舉類。

 

首先，是一個枚舉類：

public enum AuditState {

        TO_BE_AUDIT(0, "待審覈"),
        AUDITED(1, "已審覈");

        private String message;
        private Integer code;

        AuditState(Integer code, String message) {
            this.message = message;
            this.code = code;
        }

        public String getMessage() {
            return message;
        }

        public void setMessage(String message) {
            this.message = message;
        }

        public Integer getCode() {
            return code;
        }

        public void setCode(Integer code) {
            this.code = code;
        }

    }

 

 

然後是一個EnumUtil類：

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

/**
 * @author wayleung
 * @description 枚舉工具類
 * @date 2020-06-08
 */
public class EnumUtils {
    /**
     * 判斷數值是否屬於枚舉類的值
     * @param clzz 枚舉類 Enum
     * @param code
     * @author wayleung
     * @return
     */
    public static boolean isInclude(Class<?> clzz,Integer code) throws InvocationTargetException, IllegalAccessException, NoSuchMethodException {
        boolean include = false;
        if(clzz.isEnum()){
            Object[] enumConstants = clzz.getEnumConstants();
            Method getCode = clzz.getMethod("getCode");
            for (Object enumConstant:enumConstants){
                if (getCode.invoke(enumConstant).equals(code)) {
                    include = true;
                    break;
                }
            }

        }

        return include;
    }



    public static void main(String[] args) throws IllegalAccessException, NoSuchMethodException, InvocationTargetException {
        System.out.println(isInclude(BusinessGroupBuyEnum.AuditState.class,0));
        System.out.println(isInclude(BusinessGroupBuyEnum.AuditState.class,1));
        System.out.println(isInclude(BusinessGroupBuyEnum.AuditState.class,-1));
        System.out.println(isInclude(BusinessGroupBuyEnum.AuditState.class,null));
    }

}

 

 

返回的結果是：

true
true
false
false

 

通過測試！