關(guān)注程序作用域能犯，限制捕獲連接點(diǎn)的范圍佳恬。比如捕獲在特定類涕癣，包中的連接點(diǎn)

捕獲特定類中的所有連接點(diǎn)

within(TypePattern)
Picks out each join point where the executing code is defined in a type matched by TypePattern.

within捕獲特定類中的連接點(diǎn)

捕獲特定包中的所有連接點(diǎn)

同上斤寂，也用 within(TypePattern)

捕獲特定方法內(nèi)的所有連接點(diǎn)

withincode(MethodPattern)
Picks out each join point where the executing code is defined in a method whose signature matches MethodPattern.

withincode捕獲特定方法的所有連接點(diǎn)

demo

package aspectj;

public class MyClass  {
    public void doSth(){
        System.out.println("do");
    }

    public static void main(String[] args) {
        MyClass myClass = new MyClass();
        myClass.doSth();
    }
}


package aspectj;

public aspect HelloWorld {

    //捕獲特定類中所有連接點(diǎn)
    pointcut withinMyClass(): within(MyClass);

    before() : withinMyClass() {
        System.out.println("withinMyClass");
        System.out.println(thisJoinPoint.getSignature());
        System.out.println(thisJoinPoint.getSourceLocation());
    }

    //捕獲特定包中所有連接點(diǎn)
    pointcut withinPackage(): within(aspectj.*);

    //該aspect也在package aspect下，因此exclude掉
    before() : withinPackage() && !within(HelloWorld){
        System.out.println("withinPackage");
        System.out.println(thisJoinPoint.getSignature());
        System.out.println(thisJoinPoint.getSourceLocation());
    }

    //捕獲特定方法內(nèi)所有連接點(diǎn)
    pointcut withinMethod(): withincode(* MyClass.doSth());

    before():withinMethod() {
        System.out.println("withinMethod");
        System.out.println(thisJoinPoint.getSignature());
        System.out.println(thisJoinPoint.getSourceLocation());
    }
}

輸出

withinMyClass
aspectj.MyClass.<clinit>
MyClass.java:0
withinPackage
aspectj.MyClass.<clinit>
MyClass.java:0
withinMyClass
void aspectj.MyClass.main(String[])
MyClass.java:8
withinPackage
void aspectj.MyClass.main(String[])
MyClass.java:8
withinMyClass
aspectj.MyClass()
MyClass.java:9
withinPackage
aspectj.MyClass()
MyClass.java:9
withinMyClass
aspectj.MyClass()
MyClass.java:3
withinPackage
aspectj.MyClass()
MyClass.java:3
withinMyClass
aspectj.MyClass()
MyClass.java:3
withinPackage
aspectj.MyClass()
MyClass.java:3
withinMyClass
aspectj.MyClass()
MyClass.java:3
withinPackage
aspectj.MyClass()
MyClass.java:3
withinMyClass
void aspectj.MyClass.doSth()
MyClass.java:10
withinPackage
void aspectj.MyClass.doSth()
MyClass.java:10
withinMyClass
void aspectj.MyClass.doSth()
MyClass.java:4
withinPackage
void aspectj.MyClass.doSth()
MyClass.java:4
withinMyClass
PrintStream java.lang.System.out
MyClass.java:5
withinPackage
PrintStream java.lang.System.out
MyClass.java:5
withinMethod
PrintStream java.lang.System.out
MyClass.java:5
withinMyClass
void java.io.PrintStream.println(String)
MyClass.java:5
withinPackage
void java.io.PrintStream.println(String)
MyClass.java:5
withinMethod
void java.io.PrintStream.println(String)
MyClass.java:5
do

思考

上面例子是捕獲特定類奕删，包，方法中的所有連接點(diǎn)疗认，實(shí)際應(yīng)用場景應(yīng)該和其他pointcut結(jié)合在一起使用
這個(gè)語法習(xí)慣之后,越寫越快

refer

https://eclipse.org/aspectj/doc/released/progguide/semantics-pointcuts.html
《aspectj cookbook》