spring aop参数传递

原创已于 2022-04-23 17:53:09 修改 · 2.9k 阅读

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于 2022-04-23 17:27:09 首次发布

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本文通过示例详细介绍了如何在 Spring AOP 中进行方法参数传递和切面控制。展示了 HelloService 接口及其实现类 HelloServiceImpl 的不同方法，以及 CustomAspect 类中定义的切点和通知，包括对不同参数类型的方法调用的拦截。在 HelloController 中，通过 REST API 调用这些方法，展示了不同请求路径下控制台的输出结果，揭示了 Spring AOP 在方法调用前后的处理流程。

spring aop参数传递

使用示例

HelloService

public interface HelloService {

    String hello();
    String hello(String name);
    String hello(String name, Integer age);
}

HelloServiceImpl

@Service
public class HelloServiceImpl implements HelloService {

    @Override
    public String hello() {
        return "hello";
    }

    @Override
    public String hello(String name) {
        return "hello " + name;
    }

    @Override
    public String hello(String name, Integer age) {
        return "hello " + name + " " + age;
    }
}

CustomAspect

@Aspect
@Component
public class CustomAspect {

    @Pointcut("execution(* *.hello(..))")
    public void fun(){

    }

    @Pointcut("execution(* *.hello(String)) && args(name))")
    public void fun2(String name){

    }
    @Pointcut("execution(* *.hello(String,..)) && args(name))")
    public void fun3(String name){

    }

    @Pointcut("execution(* *.hello(String,Integer)) && args(name,age)")
    public void fun4(String name, Integer age){

    }

    @Before("fun()")
    public void before(JoinPoint joinPoint){
        System.out.print("before ==> ");
        process(joinPoint);
    }

    @Before("fun2(name)")
    public void before2(JoinPoint joinPoint,String name){
        System.out.print("before2 ==> " + name + " ==> ");
        process(joinPoint);
    }

    @Before("fun3(name)")
    public void after3(JoinPoint joinPoint,String name){
        System.out.print("after3 ==> "+ name + " ==> ");
        process(joinPoint);
    }

    @After("fun4(name,age)")
    public void after4(JoinPoint joinPoint, String name, Integer age){
        System.out.print("after4 ==> "+ name + " " +age + " ==> ");
        process(joinPoint);
    }

    public void process(JoinPoint joinPoint){
        MethodSignature signature =(MethodSignature) joinPoint.getSignature();
        Method method = signature.getMethod();
        System.out.println(method.getDeclaringClass().getName()+"."+method.getName()+"：被调用");
    }
}

HelloController

@RestController
public class HelloController {

    @Resource
    private HelloService helloService;

    @RequestMapping("/hello")
    public String hello(){
        return helloService.hello();
    }

    @RequestMapping("/hello2")
    public String hello2(){
        return helloService.hello("瓜田李下");
    }

    @RequestMapping("/hello3")
    public String hello3(){
        return helloService.hello("瓜田李下",20);
    }
}

使用示例

localhost:8080/hello，控制台输出：

before ==> com.example.demo.controller.HelloController.hello：被调用
before ==> com.example.demo.service.impl.HelloServiceImpl.hello：被调用

localhost:8080/hello2，控制台输出：

after3 ==> 瓜田李下 ==> com.example.demo.service.impl.HelloServiceImpl.hello：被调用
before ==> com.example.demo.service.impl.HelloServiceImpl.hello：被调用
before2 ==> 瓜田李下 ==> com.example.demo.service.impl.HelloServiceImpl.hello：被调用

localhost:8080/hello3，控制台输出：

before ==> com.example.demo.service.impl.HelloServiceImpl.hello：被调用
after4 ==> 瓜田李下 20 ==> com.example.demo.service.impl.HelloServiceImpl.hello：被调用