Manual Dalam Talian YMP
/ 记录类属性状态 (PropertyState)
记录类属性状态 (PropertyState)
通过在类成员变量上声明@PropertyState
注解,并使用PropertyStateSupport
工具类配合,便可以轻松实现对类成员属性的变化情况进行监控。
@PropertyState注解:声明记录类成员属性值的变化;
propertyName:成员属性名称,默认为空则采用当前成员名称;
aliasName:自定义别名,默认为空;
setterName:成员属性SET方法名称,默认为空;
示例代码:
public class PropertyStateTest { @PropertyState(propertyName = "user_name") private String username; @PropertyState(aliasName = "年龄") private int age; public String getUsername() { return username; } public void setUsername(String username) { this.username = username; } public int getAge() { return age; } public void setAge(int age) { this.age = age; } public static void main(String[] args) throws Exception { PropertyStateTest _original = new PropertyStateTest(); _original.setUsername("123456"); _original.setAge(20); // PropertyStateSupport<PropertyStateTest> _support = PropertyStateSupport.create(_original); PropertyStateTest _new = _support.bind(); _new.setUsername("YMPer"); _new.setAge(30); // System.out.println("发生变更的字段名集合: " + Arrays.asList(_support.getChangedPropertyNames())); for (PropertyStateSupport.PropertyStateMeta _meta : _support.getChangedProperties()) { System.out.println("已将" + StringUtils.defaultIfBlank(_meta.getAliasName(), _meta.getPropertyName()) + "由" + _meta.getOriginalValue() + "变更为" + _meta.getNewValue()); } } }
执行结果:
发生变更的字段名集合: [user_name, age] 已将user_name由123456变更为YMPer 已将年龄由20变更为30