//查询出对象所有的属性
Field[] fields = obj.getClass().getDeclaredFields();
//用于判断所有属性是否为空,如果参数为空则不查询
boolean flag = false;
for (Field field : fields) {
//不检查 直接取值
field.setAccessible(true);
try {
if(StringUtils.isNotNull(field.get(obj))) {
//不为空
flag = true;
//当有任何一个参数不为空的时候则跳出判断直接查询
break;
}
} catch (IllegalArgumentException e) {
e.printStackTrace();
} catch (IllegalAccessException e) {
e.printStackTrace();
}
}
工具类:
其中 obj 为需要判断的对象。StringUtils 是手动写的一个工具类。其中关于非空判断的代码为:
public class StringUtils {
public final static boolean isNull(Object[] objs) {
if (objs == null || objs.length == 0)
return true;
return false;
}
public final static boolean isNull(Object obj) {
if (obj == null || isNull(obj.toString())){
return true;
}
return false;
}
public final static boolean isNull(Integer integer) {
if (integer == null || integer == 0)
return true;
return false;
}
public final static boolean isNull(Collection collection) {
if (collection == null || collection.size() == 0)
return true;
return false;
}
public final static boolean isNull(Map map) {
if (map == null || map.size() == 0)
return true;
return false;
}
public final static boolean isNull(String str) {
return str == null || "".equals(str.trim())
|| "null".equals(str.toLowerCase());
}
public final static boolean isNull(Long longs) {
if (longs == null || longs == 0)
return true;
return false;
}
public final static boolean isNotNull(Long longs) {
return !isNull(longs);
}
public final static boolean isNotNull(String str) {
return !isNull(str);
}
public final static boolean isNotNull(Collection collection) {
return !isNull(collection);
}
public final static boolean isNotNull(Map map) {
return !isNull(map);
}
public final static boolean isNotNull(Integer integer) {
return !isNull(integer);
}
public final static boolean isNotNull(Object[] objs) {
return !isNull(objs);
}
public final static boolean isNotNull(Object obj) {
return !isNull(obj);
}
}
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