Spring 面向切面(Java)

Maven配置文件

pom.xml

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <groupId>org.jinglun</groupId>
  <artifactId>SpringInAction</artifactId>
  <packaging>war</packaging>
  <version>0.0.1-SNAPSHOT</version>
  <name>SpringInAction Maven Webapp</name>
  <url>http://maven.apache.org</url>
  <dependencies>
    <!-- Spring集成Junit-->
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-test</artifactId>
        <version>4.3.2.RELEASE</version>
    </dependency>
    <dependency>
        <groupId>org.mockito</groupId>
        <artifactId>mockito-core</artifactId>
        <version>3.1.0</version>
        <scope>test</scope>
    </dependency>
    
    <!-- Spring Aop -->
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-aop</artifactId>
        <version>4.3.2.RELEASE</version>
    </dependency>
    <dependency>
        <groupId>org.aspectj</groupId>
        <artifactId>aspectjweaver</artifactId>
        <version>1.9.4</version>
    </dependency>
    <dependency>
        <groupId>org.aspectj</groupId>
        <artifactId>aspectjrt</artifactId>
        <version>1.6.11</version>
    </dependency>
    
    <!-- Spring MVC -->
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-webmvc</artifactId>
        <version>4.3.2.RELEASE</version>
    </dependency>
    <!-- Spring Core -->
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-core</artifactId>
        <version>4.3.2.RELEASE</version>
    </dependency>
    <!-- junit -->
    <dependency>
        <groupId>junit</groupId>
        <artifactId>junit</artifactId>
        <version>4.12</version>
    </dependency>
  </dependencies>
  <build>
    <finalName>SpringInAction</finalName>
  </build>
</project>

 

通知类

Audience.java

package concert;

import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.AfterReturning;
import org.aspectj.lang.annotation.AfterThrowing;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;

@Aspect
public class Audience {
    
    @Pointcut("execution(** concert.Performance.perform(..))")
    public void performance() {}
    
    @Before("performance()")
    public void silenceCellPhones() {
        System.out.println("Silencing cell phones");
    }
    
    @Before("performance()")
    public void takeSeats() {
        System.out.println("Taking seats");
    }
    
    @AfterReturning("performance()")
    public void applause() {
        System.out.println("CLAP CLAP CLAP!!!");
    }
    
    @AfterThrowing("performance()")
    public void demandRefund() {
        System.out.println("Demanding a refund");
    }

    @Around("performance()")
    public void watchPerformance(ProceedingJoinPoint jp) {
        try {
            System.out.println("Silencing cell phones");
            System.out.println("Taking seats");
            jp.proceed();
            System.out.println("CLAP CLAP CLAP!!!");
        } catch (Throwable e) {
            System.out.println("Demanding a refund");
        }
    }
}

 

配置文件

ConcertConfig.java

package concert;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.EnableAspectJAutoProxy;

@Configuration
@EnableAspectJAutoProxy
@ComponentScan
public class ConcertConfig {

    @Bean
    public Audience audience() {
        return new Audience();
    }

    @Bean
    public Performance perform() {
        return new PerformanceImpl();
    }
}

 

切点

Performance.java

package concert;

public interface Performance {
    public void perform();
}

 

 

PerformanceImpl.java

package concert;

import org.springframework.stereotype.Component;

@Component
public class PerformanceImpl implements Performance{

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

 

测试类

PerformTest.java

package concert;

import static org.junit.Assert.assertNotNull;

import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;

import concert.ConcertConfig;
import concert.Performance;

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(classes=ConcertConfig.class)
public class PerformTest {
    
    @Autowired
    private Performance perform;
    
    @Test
    public void play() {
        perform.perform();
        assertNotNull(perform);
    }
}