java 反射判断类值

最新推荐文章于 2024-07-02 05:03:05 发布

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#反射 #判空

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假如一个类很多很多个字段，你需要判定其中的一大部分字段是都能为空，要是一只写循环费力费时。这时候用反射去处理会更好一点，

首先假如需要判空的字段为下面的一些字段：

//需要判空的字段
	public String VALID_PROP_ARR = "projectType,reportArea,projectName,orgName,corporation,corporationCode,registeredTime,registeredAddress,netAssets" +
			",debt,paiclupCapital1,paiclupCapital2,paiclupCapital3,employ1,employ2,employ3,collegeEmploy1,collegeEmploy2,collegeEmploy3,fixAssets1,fixAssets2," +
			"fixAssets3，allAssets1，allAssets2，allAssets3,mainRevenue1,mainRevenue2,mainRevenue3,allProfit1,allProfit2,allProfit3,tax1,tax2,tax3,serviceEnt1,serviceEnt2" +
			",serviceEnt3,serviceSmeEnt1,serviceSmeEnt2,serviceSmeEnt3,serviceExpend1,serviceExpend2,serviceExpend3,deviceDevote1,deviceDevote2,deviceDevote3,contactAddress" +
			",contactName,contactEmail,contactPhone,contactPostcode,contactMobile,contactFax,informationNote";

然后就是利用反射去判断是不是为空

/**
	 * 判断项目是否有空值
	 * @param storeAlternative
	 * @return
	 */
	private boolean chenkStore(StoreAlternative storeAlternative){
		boolean bool = false;
		Class proinfoClass = null;
		try {
			//映射类
			proinfoClass = Class.forName("cn.fulong.smefund.entity.StoreAlternative");
		} catch (ClassNotFoundException e) {
			e.printStackTrace();
		}
		//获取映射类里面的属性
		Field[] field = proinfoClass.getDeclaredFields();
		StringBuilder sb = new StringBuilder();
		String propName = "";
		String propNameGetter = "";
		for(int i=0; i<field.length; i++) {
			propName = "";
			propNameGetter = "";
			sb = new StringBuilder();
			propName = field[i].getName();
			if(this.validProp(propName)){//如果是需要判空的字段，就进行判空
				sb.append(Character.toUpperCase(propName.charAt(0)));
				sb.append(propName.substring(1));
				propNameGetter = sb.toString();
				try {
					Method method = storeAlternative.getClass().getMethod("get"+propNameGetter);
					if(method.invoke(storeAlternative) == null) {
						bool = false;
						break;
					}else{
						bool = true;
					}
				} catch (Exception e) {
					e.printStackTrace();
				}
			}
		}
		 return bool;
	}

这样就省去了很多麻烦