[Java 开发利器Lombok] 常用注解演示
在以往的对象模型编码时,我们需要写一大堆的get/set以及不同的构造函数等。Lombok为我们提供了一个非常好的插件形式。
在大多数的项目中,只需要使用到以下集中Annotation就足够了,如果需要查看更多的选项,请参考:传送门
- @Getter
- @Setter
- @ToString
- @RequiredArgsConstructor 生成final 字段的构造函数
/** * java class */ @RequiredArgsConstructor class UserVO { private final Integer id; private final String name; private int age; } /** * 编译后生成的代码 */ class UserVO { private final Integer id; private final String name; private int age; public UserVO(Integer id, String name) { this.id = id; this.name = name; } }
- @Data 组合注解
/** * @see Getter * @see Setter * @see RequiredArgsConstructor * @see ToString * @see EqualsAndHashCode * @see lombok.Value */ @Target(ElementType.TYPE) @Retention(RetentionPolicy.SOURCE) public @interface Data { /** * ... */ String staticConstructor() default ""; }
- @Builder 改变原有赋值模式
-
使用前
-
使用后(建造者模式,在Feign源码中被大量使用)
- @Slf4j lombok 提供,等价于
public static final Logger LOGGER = LoggerFactory.getLogger(UserCenterApplication.class);
/** * This annotation is valid for classes and enumerations.<br> * @see <a href="https://www.slf4j.org/api/org/slf4j/Logger.html">org.slf4j.Logger</a> * @see <a href="https://www.slf4j.org/api/org/slf4j/LoggerFactory.html#getLogger(java.lang.Class)">org.slf4j.LoggerFactory#getLogger(java.lang.Class)</a> * @see lombok.extern.apachecommons.CommonsLog @CommonsLog * @see lombok.extern.java.Log @Log * @see lombok.extern.log4j.Log4j @Log4j * @see lombok.extern.log4j.Log4j2 @Log4j2 * @see lombok.extern.slf4j.XSlf4j @XSlf4j * @see lombok.extern.jbosslog.JBossLog @JBossLog * @see lombok.extern.flogger.Flogger @Flogger */ @Retention(RetentionPolicy.SOURCE) @Target(ElementType.TYPE) public @interface Slf4j { /** @return The category of the constructed Logger. By default, it will use the type where the annotation is placed. */ String topic() default ""; }
如需转载,请注明文章出处和来源网址:http://www.divcss5.com/html/h57037.shtml