常見的未封裝的api接口我們會這么寫，來判斷這個傳入參數是否為空，來輸出什么什么參數為空

if(Stringutils.isEmpty(vo.getName())) {

return "name參數為空";

}

if(Stringutils.isEmpty(vo.getAge())) {

return "age參數為空";

}

下面使用工具類封裝的方式校驗傳入對象的指定參數是否為空，較為簡便。

缺點：

并沒有對list或者map中的某字段是否為空做判斷，只做了大小和非空的判斷

public class ArrayIsNotNull {	public static boolean isNull(Object o) {        boolean result = false;        if (null == o) {            result = true;        } else if (o instanceof List) {            result = ((List) o).size() == 0;        } else if (o instanceof Map) {            result = ((Map) o).isEmpty();        } else if (o.getClass() == String.class) {            result = isEmpty(o.toString());        }        return result;    }		public static  boolean isEmpty(String s) {    	boolean result=false;    	if("".equals(s)) {    		result=true;    	}    	return result;    }		public static void isNullAndThrowExp(String[] msg, Object... o) throws Exception {        if (null != o && msg.length>0) {            for (int i = 0; i < o.length; i++) {                if (isNull(o[i])) {                	String name=i < msg.length ? msg[i] : "";                	System.out.PRintln("第"+i+"個參數"+name+"為空！");                    throw new Exception();                }            }        }else{        	System.out.println("傳入對象為null");        	throw new Exception();        }    }		public static void main(String[] args) throws Exception {		Student student=new Student();		student.setAge(11);		student.setNameString("name");		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());			}
student對象,get set略
public class Student {	private String nameString;	private int age;	private boolean isPeople;	private ArrayList<Object> list;	private Map<Object, Object> map;