spring——AOP原理及源码（一）

<?xml version="1.0" encoding="UTF-8"?>
<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/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.tlj</groupId>
    <artifactId>spring-test</artifactId>
    <version>1.0-SNAPSHOT</version>

    <dependencies>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-aop</artifactId>
            <version>4.3.13.RELEASE</version>
        <https://img.qb5200.com/download-x/dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>4.3.13.RELEASE</version>
        <https://img.qb5200.com/download-x/dependency>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.13</version>
            <scope>test</scope>
        <https://img.qb5200.com/download-x/dependency>
        <!-- https://mvnrepository.com/artifact/javax.inject/javax.inject -->
        <dependency>
            <groupId>javax.inject</groupId>
            <artifactId>javax.inject</artifactId>
            <version>1</version>
        <https://img.qb5200.com/download-x/dependency>
        <!-- https://mvnrepository.com/artifact/com.mchange/c3p0 -->
        <dependency>
            <groupId>com.mchange</groupId>
            <artifactId>c3p0</artifactId>
            <version>0.9.5.2</version>
        <https://img.qb5200.com/download-x/dependency>
        <!-- https://mvnrepository.com/artifact/mysql/mysql-connector-java -->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.44</version>
        <https://img.qb5200.com/download-x/dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-aspects</artifactId>
            <version>4.3.12.RELEASE</version>
        <https://img.qb5200.com/download-x/dependency>
    <https://img.qb5200.com/download-x/dependencies>


</project>

package config;

import aop.LogAspects;
import aop.MathCalculator;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.EnableAspectJAutoProxy;

@EnableAspectJAutoProxy
@Configuration
public class ConfigOfAOP {

    @Bean
    public MathCalculator calculator(){
        return new MathCalculator();
    }

    @Bean
    public LogAspects logAspects(){
        return new LogAspects();
    }
}

package aop;

import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.*;

import java.util.Arrays;

/**
 * 切面类
 */
@Aspect
public class LogAspects {

    @Pointcut("execution(public int aop.MathCalculator.*(..))")
    public void poinCut(){}

    @Before("poinCut()")
    public void logStart(JoinPoint joinPoint){
        Object[] args = joinPoint.getArgs();
        System.out.println(joinPoint.getSignature().getName()+" 运行。。。@Before "+ Arrays.asList(args));
    }

    @After("poinCut()")
    public void  logEnd(){
        System.out.println("除法结束..@After");
    }

    @AfterReturning(value = "poinCut()",returning = "result")//获取方法返回值
    public void logReturning(Object result){
        System.out.println("除法正常返回..@AfterReturning "+result);
    }

    @AfterThrowing(value = "poinCut()",throwing = "e")
    public void logException(Exception e){
        System.out.println("除法异常..@AfterThrowing "+e);
    }
}

package aop;

public class MathCalculator {

    public int div(int i,int j){
        System.out.println("MathCalculator");
        return i/j;
    }
}