call捕獲的joinpoint是調用方法的地方，execution捕獲的joinpoint是執(zhí)行的地方

驗證execution

HelloAspect.aj

package aspectj;

public aspect HelloAspect {

    pointcut HelloWorldPointCut() : execution(* aspectj.HelloWorld.main(int));
    
    before() : HelloWorldPointCut() {
        System.out.println("攔截位置"+thisJoinPoint.getSourceLocation());
    }
}

image.png

輸出：

main
攔截位置HelloWorld.java:11
i=5

驗證call

直接修改HelloAspect.aj這個aspect的pointcut為call
輸出：

main
攔截位置HelloWorld.java:8
i=5

within

新建Student類和Teacher類

image.png

HelloWorld.java

package aspectj;

public class HelloWorld {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        System.out.println("main");
        Teacher teacher=new Teacher();
        teacher.print();
        Student student=new Student();
        student.print();

    }

}

HelloAspet.aj

package aspectj;

public aspect HelloAspect {

    pointcut PrintPointCut() : execution(* print(..));
    
    before() : PrintPointCut() {
        System.out.println("攔截位置"+thisJoinPoint.getSourceLocation());
    }
}

Student.java

package aspectj;

public class Student {

    
    
    public void print()
    {
        System.out.println("student");
    }
}

Teacher.java

package aspectj;

public class Teacher {

    public void print()
    {
        System.out.println("Teacher");
    }
}

運行結果：

main
攔截位置Teacher.java:5
Teacher
攔截位置Student.java:7
student

image.png

image.png

image.png

image.png

如果現(xiàn)在有個需求，只想攔截Teacher類中的print方法，其余的類不攔截（這里只演示了一個Student類，假設有很多類都有print方法該怎么實現(xiàn)呢？）
修改程序的pointcut

package aspectj;

public aspect HelloAspect {

    pointcut PrintPointCut() : execution(* print(..))&&within(Teacher);
    
    before() : PrintPointCut() {
        System.out.println("攔截位置"+thisJoinPoint.getSourceLocation());
    }
}

輸出結果：

main
攔截位置Teacher.java:5
Teacher
student

withincode

相對于within來說，這個pointcut是針對類內部進行攔截的，看個示例就清楚了
修改
Teacher.java

package aspectj;

public class Teacher {

    public void print()
    {
        System.out.println("Teacher");
    }
    public void  callPrintfirst()
    {
        print();
    }
    public void callPrintSecond()
    {
        print();
    }
    public void callPrintThree()
    {
        print();
    }
}

Teacher中有三個方法都調用了print()方法，但是現(xiàn)在只想要攔截callPrintfirst()方法調用的print方法，其余的不攔截
HelloWorld.java

package aspectj;

public class HelloWorld {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        System.out.println("main");
        Teacher teacher=new Teacher();
        teacher.callPrintfirst();
        teacher.callPrintSecond();
        teacher.callPrintThree();

    }

}

HelloAspect.aj

package aspectj;

public aspect HelloAspect {

    pointcut PrintPointCut() : call(* print(..))&&withincode(* aspectj.Teacher.callPrintfirst(..));
    
    before() : PrintPointCut() {
        System.out.println("攔截位置"+thisJoinPoint.getSourceLocation());
    }
}

運行代碼，輸出結果：

main
攔截位置Teacher.java:11
Teacher
Teacher
Teacher

image.png