java 反射判断类值

小灰灰 2022-08-26 01:30 142阅读 0赞

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