java AspectJ：两种教程
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AspectJ: two kinds of tutorials
提问by alicjasalamon
From my research I know there are two ways of using AspectJ. First is by creating A.ajclass and second by adding annotation @Aspectin A.java.
根据我的研究，我知道有两种使用 AspectJ 的方法。首先是创建A.aj类，其次是@Aspect在A.java.
I was looking for a good tutorial for this second kind, especially about lines like
我正在为第二种类型寻找一个很好的教程，尤其是关于像这样的行
@After("call(void fooMethod())")
@Around("call(void sendAndReceive())")
@Before("execution(String greeting(..)) && args(context)")
but I don't know how they are called.
但我不知道他们是怎么称呼的。
Could you recommend some tutorials?
你能推荐一些教程吗？
回答by Tomasz Nurkiewicz
This style is called @AspectJto emphasize the role of annotations. Have a look at official docsand @AspectJ cheat sheet.
这种风格被称为@AspectJ，以强调注解的作用。查看官方文档和@AspectJ 备忘单。
回答by Vikram
Annotation and the XML ways:
注释和 XML 方式：
Annotation way:Minimal xml Config file:
注解方式：最小xml配置文件：
<!-- Enable autoproxy to pick up all Java files tagged as @Aspect behave like Aspects -->
<aspectj-autoproxy/>
<!-- define bean -->
<!-- Note: MyUselessAspect.java should exist and this class must be tagged as @Aspect -->
<bean id="myUselessAspect" class="...MyUselessAspect" />
XML way:Minimal XML configuration:
XML方式：最小的XML配置：
<aop:config>
<aop:aspect ref="myUselessAspect">
<!-- this point-cut picks all methods of any return type, from any package/class with any number of Parameters -->
<aop:before method="doSomethingBeforeMethodCall" pointcut="execution(* *.*(..))"/>
<aop:after method="doSomethingAfterMethodCall" pointcut="execution(* *.*(..))"/>
</aop:aspect>
</aop:config>
<!-- No need to Annotate this java Class as @Aspect. Neither you need to define any
Point-cuts or Advices in the Java file. The <aop:config> tag takes care of everything -->
<bean id="myUselessAspect" class="...MyUselessAspect"></bean>
No changes in code required.
无需更改代码。
Pre-Req:aop Namespace must exist in the XML file
先决条件：aop 命名空间必须存在于 XML 文件中
