关于spring 事务 和 AOP 管理事务和打印日志问题

1. <tx:annotation-driven /> 就是支持事务注解的（@Transactional） 。

​ 可以在server层总使用@Transactional，进行方法内的事务管理

配置

<!-- 事务注解-->
<tx:annotation-driven transaction-manager="transactionManager" proxy-target-class="true" />
<!-- 事务管理器 -->
<bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
	<property name="dataSource" ref="dataSource" />
</bean>
<!-- 数据源 -->
<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource">
    <property name="driverClassName">
        <value>oracle.jdbc.driver.OracleDriver</value>
    </property>
    <property name="url">
        <value>jdbc:oracle:thin:@localhost:1521:orcl</value>
    </property>
    <property name="username">
        <value>xxx</value>
    </property>
    <property name="password">
        <value>xxx</value>
    </property>
    <property name="maxActive">
        <value>255</value>
    </property>
    <property name="maxIdle">
        <value>2</value>
    </property>
    <property name="maxWait">
        <value>120000</value>
    </property>
</bean>

2. 在applicationContent.xml 引入 applicationContext-aop.xml

<?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:aop="http://www.springframework.org/schema/aop"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
       http://www.springframework.org/schema/beans/spring-beans.xsd
       http://www.springframework.org/schema/aop
	   http://www.springframework.org/schema/aop/spring-aop.xsd  ">

    <!-- aop 统一处理类 -->
    <bean id="serviceLogging" class="com.xxx.hrzcyp.aop.ServiceLogging"/>

    <!-- aop 配置 -->
    <aop:config>
        <!-- 切入点 -->
        <aop:pointcut id="serviceMethodLoggingPointcut" expression="execution(* com.xxx.service.impl.*.*(..))"/>
        <!-- 定义 切面 order 的值越小，说明越先被执行 -->
        <aop:aspect id="serviceMethodLoggingAspect" ref="serviceLogging" order="100">
            <aop:before method="loggingMethodInvoked" pointcut-ref="serviceMethodLoggingPointcut"/>
            <aop:after-throwing method="loggingServiceException" pointcut-ref="serviceMethodLoggingPointcut" throwing="throwable"/>
        </aop:aspect>
    </aop:config>

</beans>

3. 用于aop处理日志和异常的java

package com.xxx.aop;

import org.aspectj.lang.JoinPoint;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * AOP 统一处理异常和返回值
 */
public class ServiceLogging {

    private static Logger exceptionLogger = LoggerFactory.getLogger("ExceptionLogging");
    private static Logger methodInvokeLogger = LoggerFactory.getLogger("MethodInvokeLogging");

    /**
     * 捕获Service层抛出的异常并做日志
     *
     * @param throwable 方法抛出的异常
     */
    public void loggingServiceException(Throwable throwable) {
        if (exceptionLogger.isErrorEnabled()) {
            StringBuilder builder = new StringBuilder();
            builder.append("cause:").append(throwable.getMessage());
            builder.append("\n\tstackTrack:\n");
            for (StackTraceElement stack : throwable.getStackTrace()) {
                builder.append("\t\t");
                builder.append(stack.toString());
                builder.append("\n");
            }
            exceptionLogger.error(builder.toString());
        }
    }

    /**
     * 记录Service方法的调用
     *
     * @param joinPoint 切入点
     */
    public void loggingMethodInvoked(JoinPoint joinPoint) {
        if (methodInvokeLogger.isDebugEnabled()) {
            String methodName = joinPoint.getSignature().getName();
            Object[] args = joinPoint.getArgs();
            StringBuilder builder = new StringBuilder();
            builder.append("调用方法[AOP切入点]:").append(methodName);
            builder.append("\t参数：");
            for (Object arg : args) {
                builder.append(arg.toString());
            }
            methodInvokeLogger.debug(builder.toString());
        }
    }

}

总结

以上工作做完后，只要有访问当 com.xxx.service.impl 目录下的所有方法。aop都会帮助我们答应访问的日志，如果加上 @Transactional 会将整个方法内的事务统一管理。有异常时也会通过aop抛出异常。