stringutils 判断对象以及对象内的map list是否为空

最新推荐文章于 2021-06-25 09:56:43 发布

zhangxiaomin19921

最新推荐文章于 2021-06-25 09:56:43 发布

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分类专栏：工具类文章标签：工具类

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本文介绍了一个Java实用工具类ArrayIsNotNull，该类提供了多种方法来检查对象及其内部结构如字符串、数组、集合和映射等是否为空或未指定。通过抛出异常的方式确保程序的健壮性和数据的有效性。

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stringutils 判断对象以及对象内的map list是否为空

public class ArrayIsNotNull {

	public static void notEmpty(String message,Object obj) {
		if (obj == null){
			throw new IllegalArgumentException(message + " must be specified,obj is null");
		}
		if (obj instanceof String && obj.toString().trim().length()==0){
			throw new IllegalArgumentException(message + " must be specified,String is empty");
		}
		if (obj.getClass().isArray() && Array.getLength(obj)==0){
			throw new IllegalArgumentException(message + " must be specified,Array is empty");
		}
		if (obj instanceof Collection && ((Collection)obj).isEmpty()){
			throw new IllegalArgumentException(message + " must be specified, Collection is empty");
		}
		if (obj instanceof Map && ((Map)obj).isEmpty()){
			throw new IllegalArgumentException(message + " must be specified,Map is empty");
		}
	}
	
	public static boolean isNull(Object obj) {
		boolean result=false;
		if (obj == null){
			result=true;
			return result;
		}
		if (obj instanceof String && obj.toString().trim().length()==0){
			result=true;
			return result;
		}
		if (obj.getClass().isArray() && Array.getLength(obj)==0){
			result=true;
			return result;
		}
		if (obj instanceof Collection && ((Collection)obj).isEmpty()){
			result=true;
			return result;
		}
		if (obj instanceof Map && ((Map)obj).isEmpty()){
			result=true;
			return result;
		}
		return result;
    }
	
	public static void isNullAndThrowExp(String[] msg, Object... o) {
		StringBuffer buffer = new StringBuffer();
		if(msg.length+1 != o.length)
			throw new IllegalArgumentException(
					"strs's length is not equlas checkNames's length");
		
        for (int i = 1; i < o.length; i++) {
        	//student.getmap() 的值为null
            if (isNull(o[i])) {
            	buffer.append(msg[i-1]+",");
            }
        }
        if(buffer.toString().endsWith(",")){
        	buffer.deleteCharAt(buffer.length() - 1);
			buffer.append(" must be specified");
			throw new IllegalArgumentException(buffer.toString());
        }
    }
	
	public static void main(String[] args) throws Exception {		
		Student student=new Student();
		student.setAge(11);
		student.setNameString("");
		student.setPeople(true);
		ArrayList<Object> list=new ArrayList<Object>();
		list.add("");
		student.setList(list);
		Map<Object, Object> map=new HashMap<Object, Object>();
		//map.put("", "");
		student.setMap(map);
		isNullAndThrowExp(new String[]{"age","nameString","isPeople","list","map"},student,student.getAge(),student.getNameString(),student.isPeople(),student.getList(),student.getMap());	
	}

}