Lombok用法简介
Lombok 简介
Lombok项目是一个Java库，它会自动插入您的编辑器和构建工具中，从而为您的Java增光添彩。
永远不要再编写另一个getter或equals方法，一个带有注释的类将具有功能全面的生成器，自动执行日志记录变量等等。
Lombok官方原版介绍如下：
Project Lombok is a java library that automatically plugs into your editor and build tools, spicing up your java. Never write another getter or equals method again, with one annotation your class has a fully featured builder, Automate your logging variables, and much more.
相关网址
Lombok Idea插件安装
下载Intellij Idea Lombok插件
https://plugins.jetbrains.com/plugin/6317-lombok/versions
Lombok依赖配置
https://projectlombok.org/setup/maven
Adding lombok to your pom file
To include lombok as a 'provided' dependency, add it to your <dependencies> block like so:
<dependencies>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<version>1.18.12</version>
<scope>provided</scope>
</dependency>
</dependencies>
JDK9+ with module-info.java
The configuration of the compiler plug-in should contain the following:
<annotationProcessorPaths>
<path>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<version>1.18.12</version>
</path>
</annotationProcessorPaths>
常用注解
Lombok features
val
Finally! Hassle-free final local variables.
var
Mutably! Hassle-free local variables.
@NonNull
or: How I learned to stop worrying and love the NullPointerException.
@Cleanup
Automatic resource management: Call your close() methods safely with no hassle.
@Getter/@Setter
Never write public int getFoo() {return foo;} again.
@ToString
No need to start a debugger to see your fields: Just let lombok generate a toString for you!
@EqualsAndHashCode
Equality made easy: Generates hashCode and equals implementations from the fields of your object..
@NoArgsConstructor, @RequiredArgsConstructor and @AllArgsConstructor
Constructors made to order: Generates constructors that take no arguments, one argument per final / non-nullfield, or one argument for every field.
@Data
All together now: A shortcut for @ToString, @EqualsAndHashCode, @Getter on all fields, and @Setter on all non-final fields, and @RequiredArgsConstructor!
@Value
Immutable classes made very easy.
@Builder
... and Bob's your uncle: No-hassle fancy-pants APIs for object creation!
@SneakyThrows
To boldly throw checked exceptions where no one has thrown them before!
@Synchronized
synchronized done right: Don't expose your locks.
@With
Immutable 'setters' - methods that create a clone but with one changed field.
@Getter(lazy=true)
Laziness is a virtue!
@Log
Captain's Log, stardate 24435.7: "What was that line again?"
experimental
Head to the lab: The new stuff we're working on.
原理
三者原理都是基于“Annotation Processing“，每个工具都在他们的JAR文件的“META-INF/services”中定义了一个javax.annotation.processing.Processor，最终完成了“从一个简洁的模板类生成包含更多方法（Getter,toString，hasCode，equals等）的生成类”的目的。
尽管Lombok、AutoValue和Immutables都使用了javac的annotation processing，但是Lombok使用注释处理的方式与AutoValue和Immutables使用注释处理的方式不同。
AutoValue和Immutables在更传统的意义上使用注释处理，并从源代码生成源代码。由AutoValue和Immutables生成的类源代码的名称与模板类不同，实际上扩展了模板类，它有自己的名称，包含所有生成的方法和字段，这避免了与模板类的任何名称冲突，并且使在同一个IDE项目中混合模板类源代码和生成的类源代码变得相当容易，因为它们实际上是不同的类。
其他
https://github.com/rzwitserloot/lombok/blob/master/doc/git-workflow.txt
