带你了解Spring AOP的使用详解

目录

• springmvc.xml
• BankDao
• AdminCheck
• BankDaoImpl
• LogInfo
• Transmaction
• AdminCheckInterceptor
• LogInfoInceptor
• TransmactionInterceptor
• Test
• 总结

springmvc.xml

<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"
       xmlns:tx="http://www.springframework.org/schema/tx"
       xmlns:mvc="http://www.springframework.org/schema/mvc"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
    https://www.springframework.org/schema/beans/spring-beans.xsd
    http://www.springframework.org/schema/context
    https://www.springframework.org/schema/context/spring-context.xsd
    http://www.springframework.org/schema/aop
    https://www.springframework.org/schema/aop/spring-aop.xsd
    http://www.springframework.org/schema/tx
    https://www.springframework.org/schema/tx/spring-tx.xsd
    http://www.springframework.org/schema/mvc
    https://www.springframework.org/schema/mvc/spring-mvc.xsd">
    <bean id="adminCheck" class="cn.hp.impl.AdminCheck"></bean>
    <bean id="transmaction" class="cn.hp.impl.Transmaction"></bean>
    <bean id="bankDao" class="cn.hp.impl.BankDaoImpl">
<!--        <property name="adminCheck" ref="adminCheck"></property>-->
<!--        <property name="transmaction" ref="transmaction"></property>-->
    </bean>
<!--    <aop:config>-->
<!--&lt;!&ndash;        切入点，什么时候，执行什么切入进来&ndash;&gt;-->
<!--        <aop:pointcut id="savepoint" expression="execution(* cn.hp.impl.*.*(..))"/>-->
<!--&lt;!&ndash;        切面-用来做事情-执行业务逻辑之前-你要做或执行什么事情&ndash;&gt;-->
<!--        <aop:aspect id="adminincepter" ref="adminCheck">-->
<!--            <aop:before method="check" pointcut-ref="savepoint"></aop:before>-->
<!--        </aop:aspect>-->
<!--        -->
<!--        <aop:aspect id="transmactionincepter" ref="transmaction">-->
<!--            <aop:around method="dointcepter" pointcut-ref="savepoint"></aop:around>-->
<!--        </aop:aspect>-->
<!--    </aop:config>-->
    <bean id="logInfo" class="cn.hp.impl.LogInfo"></bean>
    <bean id="adminCheckInterceptor" class="cn.hp.interceptor.AdminCheckInterceptor">
        <property name="adminCheck" ref="adminCheck"></property>
    </bean>
    <bean id="logInfoInceptor" class="cn.hp.interceptor.LogInfoInceptor">
        <property name="logInfo" ref="logInfo"></property>
    </bean>
    <bean id="transmactionInterceptor" class="cn.hp.interceptor.TransmactionInterceptor">
        <property name="transmaction" ref="transmaction"></property>
    </bean>
<!--    注入代理类-->
    <bean id="proxyFactory" class="org.springframework.aop.framework.ProxyFactoryBean">
<!--代理对象是谁-->
        <property name="target" ref="bankDao"></property>
<!--        代理的接口-->
        <property name="proxyInterfaces" value="cn.hp.dao.BankDao"></property>
<!--        代理的通知组件-->
        <property name="interceptorNames">
            <list>
                <value>adminCheckInterceptor</value>
                <value>logInfoInceptor</value>
                <value>transmactionInterceptor</value>
            </list>
        </property>
    </bean>

</beans>

BankDao

package cn.hp.dao;
public interface BankDao {
    /**
     * 存钱
     */
    public void remit();
    /**
     * 取钱
     */
    public void withdrawMoney();
    /**
     * 转账
     */
    public void transferAccounts();
}

AdminCheck

package cn.hp.impl;
public class AdminCheck {
    public void check(){
        System.out.println("正在验证账号信息");
    }
}

BankDaoImpl

package cn.hp.impl;
import cn.hp.dao.BankDao;
public class BankDaoImpl implements BankDao {

    @Override
    public void remit() {
//        adminCheck.check();
//        transmaction.beginTransmaction();
        System.out.println("存钱的业务逻辑");
//        transmaction.closeTransmaction();
    }
    @Override
    public void withdrawMoney() {
//        adminCheck.check();
//        transmaction.beginTransmaction();
        System.out.println("取钱的业务逻辑");
//        transmaction.closeTransmaction();
    }
    @Override
    public void transferAccounts() {
        System.out.println("转账的业务逻辑");
    }
}

LogInfo

package cn.hp.impl;
public class LogInfo {
    public void write(){
        System.out.println("写日志中");
    }
}

Transmaction

package cn.hp.impl;
import org.aspectj.lang.ProceedingJoinPoint;
public class Transmaction {
    public void beginTransmaction(){
        System.out.println("开始事务");
    }
    public void closeTransmaction(){
        System.out.println("结束事务");
    }
    public void dointcepter(ProceedingJoinPoint point) throws Throwable {
        beginTransmaction();
        point.proceed();
        closeTransmaction();
    }
}

AdminCheckInterceptor

package cn.hp.interceptor;
import cn.hp.impl.AdminCheck;
import org.springframework.aop.MethodBeforeAdvice;
import java.lang.reflect.Method;
import java.util.Set;
public class AdminCheckInterceptor implements MethodBeforeAdvice {
    private AdminCheck adminCheck;
    public AdminCheck getAdminCheck() {
        return adminCheck;
    }
    public void setAdminCheck(AdminCheck adminCheck) {
        this.adminCheck = adminCheck;
    }
    @Override
    public void before(Method method, Object[] objects, Object o) throws Throwable {
        adminCheck.check();
    }
}

LogInfoInceptor

package cn.hp.interceptor;
import cn.hp.impl.LogInfo;
import org.springframework.aop.AfterReturningAdvice;
import java.lang.reflect.Method;
public class LogInfoInceptor implements AfterReturningAdvice {
    private LogInfo logInfo;
    public LogInfo getLogInfo() {
        return logInfo;
    }
    public void setLogInfo(LogInfo logInfo) {
        this.logInfo = logInfo;
    }
    @Override
    public void afterReturning(Object o, Method method, Object[] objects, Object o1) throws Throwable {
        logInfo.write();
    }
}

TransmactionInterceptor

package cn.hp.interceptor;
import cn.hp.impl.Transmaction;
import org.aopalliance.intercept.MethodInterceptor;
import org.aopalliance.intercept.MethodInvocation;
import org.apache.ibatis.transaction.Transaction;
public class TransmactionInterceptor implements MethodInterceptor {
    private Transmaction transmaction;
    public Transmaction getTransmaction() {
        return transmaction;
    }
    public void setTransmaction(Transmaction transmaction) {
        this.transmaction = transmaction;
    }
    @Override
    public Object invoke(MethodInvocation invocation) throws Throwable {
        transmaction.beginTransmaction();
        Object obj = invocation.proceed();
        transmaction.closeTransmaction();
        return obj;
    }
}

Test

package cn.hp.test;
import cn.hp.dao.BankDao;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
public class Test {
    public static void main(String[] args) {
        //test1();
//        test2();
        test3();
    }
    private static void test3() {
        ApplicationContext ac= new ClassPathXmlApplicationContext("springmvc.xml");
        BankDao proxyFactory = ac.getBean("proxyFactory", BankDao.class);
        proxyFactory.remit();
    }
    private static void test2() {
        ApplicationContext ac = new ClassPathXmlApplicationContext("springmvc.xml");
        BankDao bd = ac.getBean("bankDao",BankDao.class);
        bd.transferAccounts();
    }
    private static void test1() {
        ApplicationContext ac = new ClassPathXmlApplicationContext("springmvc.xml");
        BankDao bd = ac.getBean("bankDao",BankDao.class);
        bd.withdrawMoney();
    }
}

总结

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