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SpringMVC：拦截Mybatis的mapper

news 来源：原创 2024/7/7 19:23:12

我们在使用mybatis的时候会碰到一些公共添加时间，操作人员，更新时间、或者一些分页这个使我们如果要去添加每个对应的- service - dao - mapper - xml 这样就造成很多冗余代码，那这个时候我们就需要使用一些通用方法，统一就行修改和赋值。

我们就需要使用到拦截，那我们如何拦截 Mybatis的mapper呢？

我们拦截mapper有两种方法：

1、使用@Aspect注解

要去使用jdk的代理，否则代理不了mapper（即mybatis代理的mapper没有默认的构造器，cglib无法再给这个代理构造代理，会报如下错误

org.springframework.aop.framework.AopConfigException: Could not generate CGLIB subclass of class [class com.sun.proxy.$Proxy13]: Common causes of this problem include using a final class or a non-visible class; nested exception is java.lang.IllegalArgumentException: Cannot subclass final class class com.sun.proxy.$Proxy13）

那我们需要将对@Aspect支持修改为jdk代理

<!-- 启动对@Aspectj的支持 true为cglib，false为jdk代理，为true的话，会导致拦截不了mybatis的mapper-->
<aop:aspectj-autoproxy proxy-target-class="false" />

之后就是使用注解去配置拦截，进行修改记录的操作

@Aspect
@Component
public class DataLogAspect {private static final Logger logger = LoggerFactory.getLogger(DataLogAspect.class);@Resourceprivate ActionMapper actionMapper;@Pointcut("execution(public * com.kingbal.infrastructure.repository.mapper.*.insert*(..)) " +"&& !execution(public * com.kingbal.infrastructure.repository.mapper.ActionMapper.insert*(..))")public void insert(){}@Pointcut("execution(public * com.kingbal.infrastructure.repository.mapper.*.update*(..))")public void update(){}@Pointcut("execution(public * com.kingbal.infrastructure.repository.mapper.*.delete*(..))")public void delete(){}@Around("insert() || update() || delete()")public Object addOperateLog(ProceedingJoinPoint proceedingJoinPoint) throws Throwable {...}
}

2、使用MethodInterceptor

使用aopalliance的MethodInterceptor

（1）配置文件

去掉对@Aspect注解的支持（也可以不去掉，只要不是proxy-target-class = true就可以）。然后配置aop

<bean id="dataLogInterceptor" class="com.kingbal.infrastructure.dataLog.dataLogInterceptor" />
<aop:config><aop:pointcut id="dataLogInsertPointCut" expression="execution(* com.kingbal.infrastructure.repository.mapper..insert*(..))&amp;&amp; !execution(* com.kingbal.infrastructure.repository.mapper.ActionMapper.*(..))" /><aop:pointcut id="dataLogUpdatePointCut" expression="execution(* com.kingbal.infrastructure.repository.mapper..update*(..)) &amp;&amp; !execution(* com.kingbal.infrastructure.repository.mapper.ActionMapper.*(..))" /><aop:pointcut id="dataLogDeletePointCut" expression="execution(* com.kingbal.infrastructure.repository.mapper..delete*(..)) &amp;&amp; !execution(* com.kingbal.infrastructure.repository.mapper.ActionMapper.*(..))" /><aop:advisor advice-ref="dataLogInterceptor" pointcut-ref="dataLogInsertPointCut" /><aop:advisor advice-ref="dataLogInterceptor" pointcut-ref="dataLogUpdatePointCut" /><aop:advisor advice-ref="dataLogInterceptor" pointcut-ref="dataLogDeletePointCut" />
</aop:config>

（2）实现MethodInterceptor

public class DataLogInterceptor implements MethodInterceptor{private static final Logger logger = LoggerFactory.getLogger(DataLogInterceptor.class);public DataLogInterceptor() {}@Resourceprivate ActionMapper actionMapper;@Overridepublic Object invoke(MethodInvocation methodInvocation) throws Throwable {Method method = methodInvocation.getMethod();String methodName = method.getName();Class<?> cls = method.getDeclaringClass();Object service = methodInvocation.getThis();Object[] args = methodInvocation.getArguments();Integer actionType = -1; ...}
}

推荐使用 @Aspect