code: public static void setFieldValue(final Object obj, final String fieldName, final Object value) {
  		Field field = getField(obj.getClass(), fieldName);
  		if (field == null) {
  			throw new IllegalArgumentException("Could not find field [" + fieldName + "] on target [" + obj + ']');
  		}
  		setField(obj, field, value);
  	}
docs: 直接设置对象属性值, 无视private/protected修饰符, 不经过setter函数.
  
  性能较差, 用于单次调用的场景