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前面几节我们使用三种方式完成了代理，接下来，我们将看一下在spring中如何完成aop。

1、前提约束

• 完成基于注解的springmvc的demo

2、操作步骤

• 在src/main/resources文件夹下创建一个application-aop-anno.xml，内容如下：

• 在src/main/java文件夹下创建net.wanho.aspect.MyAspect.java，内容如下：

import org.aspectj.lang.JoinPoint;import org.aspectj.lang.ProceedingJoinPoint;import org.aspectj.lang.annotation.*;import org.springframework.stereotype.Component;import java.util.Arrays;@Aspect@Componentpublic class MyAspect {    @Pointcut("execution(* net.wanho.aspect.StudentService.*())")    public void pointCut(){}    @After("pointCut()")    public void testPointcut()    {        System.out.println("testPointcut");    }    @Before("execution(* net.wanho.aspect.StudentService.*(..))")    public void security(JoinPoint joinPoint)    {        System.out.println(joinPoint.getKind()+"."+joinPoint.getSignature().getName()+":("+Arrays.toString(joinPoint.getArgs())+")");        System.out.println("权限");    }    @Around("execution(* net.wanho.aspect.StudentService.*(int)))")    public Object around(ProceedingJoinPoint proceedingJoinPoint) throws Throwable {        System.out.println("around in");        Object object = proceedingJoinPoint.proceed();        System.out.println("around out");        return object;    }    @AfterThrowing("execution(* net.wanho.aspect.StudentService.*(int)))")    public void afterThrowing()    {        System.out.println("exception");    }    @AfterReturning("execution(* net.wanho.aspect.StudentService.*(int)))")    public void afterReturning()    {        System.out.println("return");    }}

• 在src/main/java文件夹下创建net.wanho.aspect.StudentService.java

public interface StudentService {    void query();}

• 在src/main/java文件夹下创建net.wanho.aspect.StudentServiceImpl.java

import net.wanho.class134.entity.Student;import org.springframework.stereotype.Component;import java.util.HashMap;import java.util.Map;@Component(value = "studentService")public class StudentServiceImpl implements StudentService {    @Override    public void query() {        System.out.println("查询");    }}

• 在src/main/java文件夹下创建net.wanho.aspect.Test.java

import org.springframework.context.ApplicationContext;import org.springframework.context.support.ClassPathXmlApplicationContext;public class Test {    public static void main(String[] args) throws Exception {        ApplicationContext applicationContext = new ClassPathXmlApplicationContext("application-aop-anno.xml");        StudentService studentService = applicationContext.getBean("studentService", StudentService.class);        studentService.query();    }}

以上就是采用注解方式完成aop的过程。

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