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modifiers-pattern：修饰符

ret-type-pattern：方法返回类型

declaring-type-pattern：指定方法所属的类

name-pattern：方法名

param-pattern：参数列表

throws-pattern：抛出的异常

 

All parts except the returning type pattern (ret-type-pattern in the preceding snippet), the name pattern, and the parameters pattern are optional.

除ret-type-pattern、 name pattern、param-pattern外都是可选参数

The returning type pattern determines what the return type of the method must be in order for a join point to be matched. * is most frequently used as the returning type pattern.It matches any return type. A fully-qualified type name matches only when the method returns the given type. 

ret-type-pattern决定方法必须要返回的类型。*最常用，匹配任何返回类型。方法返回类型必须与完全限定类型名匹配

The name pattern matches the method name.You can use the *wildcard as all or part of a name pattern.

name pattern匹配方法名称。可以用通配符*作为全部或部分name pattern.

 If you specify a declaring type pattern, include a trailing . to join it to the name pattern component.

如果你声明一个declaring-type-pattern，为了连接 name pattern应该加上“.”，即declaring-type-pattern.name-patterm

The parameters pattern is slightly more complex: () matches a method that takes no parameters, whereas (..) matches any number (zero or more) of parameters. The (*) pattern matches a method that takes one parameter of any type. (*,String) matches a method that takes two parameters. The first can be of any type, while the second must be a String. 

参数格式parameters pattern稍微复杂一点，

（）匹配无参方法。

而（..）匹配任何数量（0个或多个）参数。

（*）匹配任何类型的一个参数

（*,string）匹配两个参数，前面是任何类型，第二个必须是字符串

 

• The execution of any public method:

  execution(public * *(..))

• The execution of any method with a name that begins with set:

  execution(* set*(..))

• The execution of any method defined by the AccountService interface:

  execution(* com.xyz.service.AccountService.*(..))

• The execution of any method defined in the service package:

  execution(* com.xyz.service.*.*(..))

• The execution of any method defined in the service package or one of its sub-packages:service 包和其子包（任意层？）下的所有方法

  execution(* com.xyz.service..*.*(..))

• Any join point (method execution only in Spring AOP) within the service package:

  within(com.xyz.service.*)

• Any join point (method execution only in Spring AOP) within the service package or one of its sub-packages:

  within(com.xyz.service..*)

• Any join point (method execution only in Spring AOP) where the proxy implements the AccountService interface:

  this(com.xyz.service.AccountService)