ombok的官方地址:https://projectlombok.org/
lombok的Github地址:https://github.com/rzwitserloot/lombok
lombok是一个可以通过简单的注解的形式来帮助我们简化消除一些必须有但显得很臃肿的 Java 代码的工具,简单来说,比如我们新建了一个类,然后在其中写了几个字段,然后通常情况下我们需要手动去建立getter和setter方法啊,构造函数啊之类的,lombok的作用就是为了省去我们手动创建这些代码的麻烦,它能够在我们编译源码的时候自动帮我们生成这些方法。
lombok能够达到的效果就是在源码中不需要写一些通用的方法,但是在编译生成的字节码文件中会帮我们生成这些方法,这就是lombok的神奇作用。
虽然有人可能会说IDE里面都自带自动生成这些方法的功能,但是使用lombok会使你的代码看起来更加简洁,写起来也更加方便。
@Data 示例
@Getter @Setter 示例
Lombok annotated code:
@Getter @Setter private boolean employed = true; @Setter(AccessLevel.PROTECTED) private String name;
Equivalent Java source code:
private boolean employed = true; private String name; public boolean isEmployed() { return employed; } public void setEmployed(final boolean employed) { this.employed = employed; } protected void setName(final String name) { this.name = name; }
@ToString示例
Lombok annotated code:
@ToString(callSuper=true,exclude="someExcludedField") public class Foo extends Bar { private boolean someBoolean = true; private String someStringField; private float someExcludedField; }
Equivalent Java source code:
public class Foo extends Bar { private boolean someBoolean = true; private String someStringField; private float someExcludedField; @java.lang.Override public java.lang.String toString() { return "Foo(super=" + super.toString() + ", someBoolean=" + someBoolean + ", someStringField=" + someStringField + ")"; } }
@Cleanup示例
Lombok annotated code:
public void testCleanUp() { try { @Cleanup ByteArrayOutputStream baos = new ByteArrayOutputStream(); baos.write(new byte[] {'Y','e','s'}); System.out.println(baos.toString()); } catch (IOException e) { e.printStackTrace(); } }
Equivalent Java source code:
public void testCleanUp() { try { ByteArrayOutputStream baos = new ByteArrayOutputStream(); try { baos.write(new byte[]{'Y', 'e', 's'}); System.out.println(baos.toString()); } finally { baos.close(); } } catch (IOException e) { e.printStackTrace(); } }
@Synchronized示例
Lombok annotated code:
private DateFormat format = new SimpleDateFormat("MM-dd-YYYY"); @Synchronized public String synchronizedFormat(Date date) { return format.format(date); }
Equivalent Java source code:
private final java.lang.Object $lock = new java.lang.Object[0]; private DateFormat format = new SimpleDateFormat("MM-dd-YYYY"); public String synchronizedFormat(Date date) { synchronized ($lock) { return format.format(date); } }
更多示例和使用方法请参考官网。
参考:
http://www.cnblogs.com/holten/p/5729226.html
http://www.cnblogs.com/lexiaofei/p/8422463.html