Spring AOP

AOP属于解释：

主营业务（targetobject）：crud，安全性检查就是我们的横切关注点，把横切关注点拿出来模块化为一个类，这个类就叫做切面类（Aspect），切面类作用在目标对象之前还是之后还是throws时，叫做advice，作用在目标对象的哪些方法上，叫做pointcut，怎么作用在目标对象上，这个过程叫做织物（weave），织物是一个概念，通过织物怎么作用在目标对象上，需要一个点来接，这个点叫做joinpoint，它也是一个概念，一个标识。

注解配置：

用到的依赖：

<?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.ming</groupId>
    <artifactId>spring_aop_annotation</artifactId>
    <version>1.0-SNAPSHOT</version>

    <dependencies>

        <!-- https://mvnrepository.com/artifact/org.springframework/spring-core -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-core</artifactId>
            <version>5.1.5.RELEASE</version>
        </dependency>

        <!-- https://mvnrepository.com/artifact/org.springframework/spring-beans -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-beans</artifactId>
            <version>5.1.5.RELEASE</version>
        </dependency>

        <!-- https://mvnrepository.com/artifact/org.springframework/spring-context -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>5.1.5.RELEASE</version>
        </dependency>

        <!-- https://mvnrepository.com/artifact/org.springframework/spring-aop -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-aop</artifactId>
            <version>5.1.5.RELEASE</version>
        </dependency>

        <!-- https://mvnrepository.com/artifact/org.junit.jupiter/junit-jupiter-api -->
        <dependency>
            <groupId>org.junit.jupiter</groupId>
            <artifactId>junit-jupiter-api</artifactId>
            <version>RELEASE</version>
            <scope>test</scope>
        </dependency>

        <!-- https://mvnrepository.com/artifact/junit/junit -->
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
            <scope>test</scope>
        </dependency>

        <!-- https://mvnrepository.com/artifact/org.aspectj/aspectjweaver -->
        <dependency>
            <groupId>org.aspectj</groupId>
            <artifactId>aspectjweaver</artifactId>
            <version>1.9.2</version>
        </dependency>


    </dependencies>

    <build>
        <resources>
            <resource>
                <directory>src/main/resources</directory>
                <includes>
                    <include>**/*.xml</include>
                </includes>
            </resource>
        </resources>
    </build>
</project>

xml配置文件：

<?xml  version="1.0"  encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:aop="http://www.springframework.org/schema/aop"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
       http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
       http://www.springframework.org/schema/context
       http://www.springframework.org/schema/context/spring-context.xsd
       http://www.springframework.org/schema/aop
       http://www.springframework.org/schema/aop/spring-aop.xsd">
    <!--开启注解模式-->
    <aop:aspectj-autoproxy/>

    <!--targetObject-->
    <bean id="userManagerImpl" class="com.ming.UserManagerImpl"/>

    <!--Annotation-->
    <bean id="securityHandler" class="com.ming.SecurityHandler"/>
</beans>

主营业务接口：

public interface IUserManager {

    public void addUser(String username, String password);

    public void modifyUser(int id, String username, String password);
}

接口实现类：

public class UserManagerImpl implements IUserManager{


    public void addUser(String username, String password) {
        System.out.println("=========UserManagerImpl.addUser()===========");
    }

    public void modifyUser(int id, String username, String password) {
        System.out.println("=========UserManagerImpl.modifyUser()===========");
    }
}

切面类：

import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;

@Aspect
public class SecurityHandler {

    @Pointcut("execution(* com.ming.UserManagerImpl.*(..))")
    private void allMethod(){}

    @Before("allMethod()")
    public void checkSecurity(){
        System.out.println("=======checkSecurity()==========");
    }
}

测试：

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;


public class Client {

    public static void main(String[] args) {
        ApplicationContext context =
                new ClassPathXmlApplicationContext("applicationContext.xml");
        IUserManager iUserManager = (IUserManager) context.getBean("userManagerImpl");
        iUserManager.addUser("abc","111");


    }
}

---

xml配置

xml配置文件：

<?xml  version="1.0"  encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:aop="http://www.springframework.org/schema/aop"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
       http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
       http://www.springframework.org/schema/context
       http://www.springframework.org/schema/context/spring-context.xsd
       http://www.springframework.org/schema/aop
       http://www.springframework.org/schema/aop/spring-aop.xsd">


    <!--targetObject-->
    <bean id="userManagerImpl" class="com.ming.UserManagerImpl"/>

    <!--Annotation-->
    <bean id="securityHandler" class="com.ming.SecurityHandler"/>


    <!--
        Advice
        PointCut
        JoinPoint
    -->
    <aop:config>
        <aop:aspect id="myAspect" ref="securityHandler">
            <aop:pointcut id="allMethod" expression="execution(* com.ming.UserManagerImpl.add*(..))"/>
            <aop:before method="checkSecurity" pointcut-ref="allMethod"/>
        </aop:aspect>
    </aop:config>
</beans>

主营业务接口：

public interface IUserManager {

    public void addUser(String username, String password);

    public void modifyUser(int id, String username, String password);
}

接口实现类：

public class UserManagerImpl implements IUserManager{


    public void addUser(String username, String password) {
        System.out.println("=========UserManagerImpl.addUser()===========");
    }

    public void modifyUser(int id, String username, String password) {
        System.out.println("=========UserManagerImpl.modifyUser()===========");
    }
}

切面类（安全性检查）：

public class SecurityHandler {

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

测试：

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;


public class Client {

    public static void main(String[] args) {
        ApplicationContext context =
                new ClassPathXmlApplicationContext("applicationContext.xml");
        IUserManager iUserManager = (IUserManager) context.getBean("userManagerImpl");
        iUserManager.addUser("abc","111");
        iUserManager.modifyUser(1,"ddd","222");

    }
}