Detailed explanation of actual combat cases of AspectJ framework

package org.crazyit.app.service;
public class Hello
{
  //Define a simple method to simulate the business logic method in application
  public void foo()
  {
    System.out.println ("execute the foo() method of the Hello component");
  }
  //Define an adduser() method to simulate the method of adding users in the application
  public int addUser(String name , String pass)
  {
    System.out.println ("addUser adding user to execute Hello component: + name)";
    return 20;
  }
}

package org.crazyit.app.service;
public class World
{
  //Define a simple method to simulate the business logic method in application
  public void bar()
  {
    System.out.println ("execute the bar () method of the world component");
  }
}

package org.crazyit.app.aspect;
public aspect AuthAspect
{
  //Specifies that the org.crazyit.app Execute the following code block before any method of any class in. Service package
  //The first asterisk indicates that the return value is unlimited; the second asterisk indicates that the class name is unlimited;
  //The third asterisk indicates that there is no limit to the method name; the... In parentheses represents any parameter with unlimited number and type
  before(): execution(* org.crazyit.app.service.*.*(..))
  {
    System.out.println ("simulate permission check...");
  }
}

package org.crazyit.app.aspect;
public aspect LogAspect
{
  //Define a pointcut named logpointcut,
  //The pointcut represents the pointcut expression given later, which can be reused
  pointcut logPointcut()
    :execution(* org.crazyit.app.service.*.*(..));
  after():logPointcut()
  {
    System.out.println (simulation log...);
  }
}

package org.crazyit.app.aspect;
public aspect TxAspect
{
  //Designated execution Hello.sayHello The following code block is executed when () method
  Object around():call(* org.crazyit.app.service.*.*(..))
  {
    System.out.println ("simulate open transaction...");
    //Call back the original target method
    Object rvt = proceed();
    System.out.println ("simulate end transaction...");
    return rvt;
  }
}

package lee;
import org.crazyit.app.service.Hello;
import org.crazyit.app.service.World;
public class AspectJTest
{
  public static void main(String[] args)
  {
    Hello hello = new Hello();
    hello.foo();
    hello.addUser ("Monkey King", "7788");
    World world = new World();
    world.bar();
  }
}