SpringBoot中Inteceptor 之 MethodInterceptor

MethodInterceptor是AOP项目中的拦截器，它拦截的目标是方法，不仅仅controller中的方法

自定义拦截器，实现MethodInterceptor接口的invoke()方法

package com.wang.chao.micro.interceptor;
 
import org.aopalliance.intercept.MethodInterceptor;
import org.aopalliance.intercept.MethodInvocation;
 
public class MyMethodInterceptor implements MethodInterceptor {
    @Override
    public Object invoke(MethodInvocation methodInvocation) throws Throwable {
        System.out.println("MyMethodInterceptor  "+methodInvocation.getMethod().getName());
        return methodInvocation.proceed();
    }
}

package com.wang.chao.micro.interceptor.config;
 
import com.wang.chao.micro.interceptor.MyMethodInterceptor;
import org.springframework.aop.aspectj.AspectJExpressionPointcut;
import org.springframework.aop.support.DefaultPointcutAdvisor;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
 
@Configuration
public class InterceptorConfig {
    public static final String traceExecution = "execution(* com.wang.chao.micro..*.*(..))";
 
    @Bean
    public DefaultPointcutAdvisor defaultPointcutAdvisor(){
        MyMethodInterceptor methodInterceptor = new MyMethodInterceptor();
        AspectJExpressionPointcut pointcut = new AspectJExpressionPointcut();
        pointcut.setExpression(traceExecution);
 
        DefaultPointcutAdvisor advisor = new DefaultPointcutAdvisor();
        advisor.setPointcut(pointcut);
        advisor.setAdvice(methodInterceptor);
        return advisor;
    }
}

案例二

与案例一的主要区别是用JdkRegexpMethodPointcut来构造切点

package com.wang.chao.micro.interceptor.config;
 
import com.wang.chao.micro.interceptor.MyMethodInterceptor;
import org.springframework.aop.aspectj.AspectJExpressionPointcut;
import org.springframework.aop.support.DefaultPointcutAdvisor;
import org.springframework.aop.support.JdkRegexpMethodPointcut;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
 
@Configuration
public class InterceptorConfig {
    public static final String traceExecution = "execution(* com.wang.chao.micro..*.*(..))";
 
    @Bean
    public DefaultPointcutAdvisor defaultPointcutAdvisor() {
        MyMethodInterceptor methodInterceptor = new MyMethodInterceptor();
        DefaultPointcutAdvisor advisor = new DefaultPointcutAdvisor();
        //case 1
        // AspectJExpressionPointcut pointcut = new AspectJExpressionPointcut();
        // pointcut.setExpression(traceExecution);
 
        //case 2
        JdkRegexpMethodPointcut pointcut2 = new JdkRegexpMethodPointcut();
        pointcut2.setPattern("com.wang.chao.micro.*");
 
        advisor.setPointcut(pointcut2);
        advisor.setAdvice(methodInterceptor);
        return advisor;
    }
}

案例三

自定义注解 AspectJExpressionPointcut 

package com.wang.chao.micro.interceptor.annotation;
 
import java.lang.annotation.*;
 
@Target(ElementType.METHOD)
@Retention(RetentionPolicy.RUNTIME)
@Documented
public @interface InterceptorAnnotation {
}

package com.wang.chao.micro.interceptor.config;
 
import com.wang.chao.micro.interceptor.MyMethodInterceptor;
import org.springframework.aop.aspectj.AspectJExpressionPointcut;
import org.springframework.aop.support.DefaultPointcutAdvisor;
import org.springframework.aop.support.JdkRegexpMethodPointcut;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
 
@Configuration
public class InterceptorConfig {
    public static final String traceAnnotationExecution = "@annotation(com.wang.chao.micro.interceptor.annotation.InterceptorAnnotation)";
    @Bean
    public DefaultPointcutAdvisor defaultPointcutAdvisor() {
        MyMethodInterceptor methodInterceptor = new MyMethodInterceptor();
        DefaultPointcutAdvisor advisor = new DefaultPointcutAdvisor();
        //case 3
        AspectJExpressionPointcut pointcut = new AspectJExpressionPointcut();
        pointcut.setExpression(traceAnnotationExecution);
 
        advisor.setPointcut(pointcut);
        advisor.setAdvice(methodInterceptor);
        return advisor;
    }
}

案例四

自定义注解 AnnotationMatchingPointcut

package com.wang.chao.micro.interceptor.config;
 
import com.wang.chao.micro.interceptor.MyMethodInterceptor;
import com.wang.chao.micro.interceptor.annotation.InterceptorAnnotation;
import org.springframework.aop.aspectj.AspectJExpressionPointcut;
import org.springframework.aop.support.DefaultPointcutAdvisor;
import org.springframework.aop.support.JdkRegexpMethodPointcut;
import org.springframework.aop.support.annotation.AnnotationMatchingPointcut;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
 
@Configuration
public class InterceptorConfig {
 
    @Bean
    public DefaultPointcutAdvisor defaultPointcutAdvisor() {
        MyMethodInterceptor methodInterceptor = new MyMethodInterceptor();
        DefaultPointcutAdvisor advisor = new DefaultPointcutAdvisor();
        //case 4
        AnnotationMatchingPointcut pointcut = new AnnotationMatchingPointcut(null, InterceptorAnnotation.class);
 
        advisor.setPointcut(pointcut);
        advisor.setAdvice(methodInterceptor);
        return advisor;
    }
}

测试类

package com.wang.chao.micro.service;
 
import org.springframework.stereotype.Service;
 
@Service
public class UserService {
 
    public void saveUser(String name, String sex) {
        System.out.println("name = " + name + ", sex = " + sex+" id =");
        sayHello(name);
    }
 
    public void sayHello(String name){
        System.out.println("Hello name = " + name+" Welcome in Spring Interceptor world");
    }
}

请求调用测试

package com.wang.chao.micro.controller;
 
import com.wang.chao.micro.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;
 
@RestController
public class UserController {
    @Autowired
    private UserService userService;
 
    @RequestMapping(value="/" ,method = RequestMethod.GET)
    public void saveUser(String name,String sex){
       userService.saveUser(name,sex);
 
    }
}

启动调用测试

package com.wang.chao.micro;
 
import com.wang.chao.micro.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.ApplicationContext;
 
@SpringBootApplication
public class Application {
    @Autowired
    private ApplicationContext applicationContext;
    public static void main(String[] args) {
        ApplicationContext applicationContext =  SpringApplication.run(Application.class, args);
 
        UserService userService=(UserService) applicationContext.getBean("userService");
        userService.saveUser("wagnchao","nan");
        userService.sayHello("wangchaochao");
    }
 
}