springboot2.0配置全局事务支持 附execution表达式理解

1.引入依赖

 <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-aop</artifactId>
</dependency>

2.编写java配置

package cn.rivamed.framework.common.config;

import org.aspectj.lang.annotation.Aspect;
import org.springframework.aop.Advisor;
import org.springframework.aop.aspectj.AspectJExpressionPointcut;
import org.springframework.aop.support.DefaultPointcutAdvisor;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.transaction.PlatformTransactionManager;
import org.springframework.transaction.TransactionDefinition;
import org.springframework.transaction.annotation.EnableTransactionManagement;
import org.springframework.transaction.interceptor.DefaultTransactionAttribute;
import org.springframework.transaction.interceptor.NameMatchTransactionAttributeSource;
import org.springframework.transaction.interceptor.TransactionInterceptor;

@Aspect
@Configuration
@EnableTransactionManagement
public class TransactionConfig {

    private static final String ASPECTJ_EXPRESSION = "execution(* cn.rivamed..service..*Service*.*(..))";

    @Autowired
    private PlatformTransactionManager transactionManager;

    @Bean
    public TransactionInterceptor txAdvice() {

        DefaultTransactionAttribute txAttr_REQUIRED = new DefaultTransactionAttribute();
        txAttr_REQUIRED.setPropagationBehavior(TransactionDefinition.PROPAGATION_REQUIRED);

        DefaultTransactionAttribute txAttr_REQUIRED_READONLY = new DefaultTransactionAttribute();
        txAttr_REQUIRED_READONLY.setPropagationBehavior(TransactionDefinition.PROPAGATION_REQUIRED);
        txAttr_REQUIRED_READONLY.setReadOnly(true);

        NameMatchTransactionAttributeSource source = new NameMatchTransactionAttributeSource();

        source.addTransactionalMethod("save*", txAttr_REQUIRED);
        source.addTransactionalMethod("remove*", txAttr_REQUIRED);
        source.addTransactionalMethod("update*", txAttr_REQUIRED);
        source.addTransactionalMethod("exec*", txAttr_REQUIRED);
//        source.addTransactionalMethod("set*", txAttr_REQUIRED);
//        source.addTransactionalMethod("get*", txAttr_REQUIRED_READONLY);
//        source.addTransactionalMethod("query*", txAttr_REQUIRED_READONLY);
//        source.addTransactionalMethod("find*", txAttr_REQUIRED_READONLY);
//        source.addTransactionalMethod("list*", txAttr_REQUIRED_READONLY);
//        source.addTransactionalMethod("count*", txAttr_REQUIRED_READONLY);
//        source.addTransactionalMethod("is*", txAttr_REQUIRED_READONLY);

        return new TransactionInterceptor(transactionManager, source);
    }

    @Bean
    public Advisor txAdviceAdvisor() {
        AspectJExpressionPointcut pointcut = new AspectJExpressionPointcut();
        pointcut.setExpression(ASPECTJ_EXPRESSION);
        return new DefaultPointcutAdvisor(pointcut, txAdvice());
    }
}

3.切面目录结构

 4.execution理解

"execution(* cn.rivamed..service..*Service*.*(..))"

execution(): 表达式主体。

第一个*号：表示返回类型， *号表示所有的类型。

包名：表示需要拦截的包名，后面的两个句点表示当前包和当前包的所有子包

第二个*号：表示类名，*Service*表示包下包含Service的所有类。

*(..):最后这个星号表示方法名，*号表示所有的方法，后面括弧里面表示方法的参数，两个句点表示任何参数

5.@Transactional注解

@Transactional(rollbackOn = Exception.class) 和 @Transactional(rollbackFor = Exception.class)含义相同