Aspect注解的使用，实现aop事务

最新推荐文章于 2024-06-05 11:46:50 发布

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最新推荐文章于 2024-06-05 11:46:50 发布

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分类专栏： spring 文章标签： java spring aop

本文链接：https://blog.youkuaiyun.com/qq_35418518/article/details/89069212

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本文介绍了如何在Spring框架中利用@Aspect注解进行AOP事务管理。详细阐述了从设置事务工具类，创建切面类，定义被监听的方法到执行事务操作的整个流程，特别指出在使用@AfterReturning和@Around注解时，应注意 Around 注解返回结果对AfterReturning的影响。

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@Aspect的使用

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

项目结构

@Component
public class User {

    public String add(String message) {
        System.out.println("执行User添加方法:" + message);
        return "add:" + message;
    }

    public int addNum(String message, int num) {
        System.out.println("执行User添加方法:" + message + "，编号：" + num);
        return num + 5;
    }
}

AfterReturning是在Around后面调用，如果同时使用这两个注解，Around需要返回结果，否则AfterReturning拿不到返回参数

@Component
@Aspect
public class AopSpringAspect {

    // // 异常通知
    @AfterThrowing("execution(* com.stude.freemarker.aspect.server.User.*(..))")
    public void afterThrowing() {
        System.out.println("任务执行异常");
    }

    // 环绕通知
    @Around("execution(* com.stude.freemarker.aspect.server.User.*(..))")
    public Object around(ProceedingJoinPoint proceedingJoinPoint) throws Throwable {
        System.out.println("环绕执行任务前");
        Object rvt = proceedingJoinPoint.proceed();
        System.out.println("环绕执行任务后: " + new Gson().toJson(rvt));
        return rvt;
    }

    @Before("within(com.stude.freemarker.aspect.server.*)")
    public void before(JoinPoint joinPoint){
        Object args[] = joinPoint.getArgs();
        MethodSignature signature = (MethodSignature)joinPoint.getSignature();
        Method method = signature.getMethod();
        System.out.println("传入参数" + method.getDeclaringClass().getName());
        System.out.println("传入参数" + method.getName());
        System.out.println("传入参数" + new Gson().toJson(args));
    }

    @AfterReturning(value = "within(com.stude.freemarker.aspect.server.*)",returning = "rvt")
    public void after(JoinPoint joinPoint,Object rvt){
        MethodSignature signature = (MethodSignature)joinPoint.getSignature();
        Method method = signature.getMethod();
        System.out.println("返回参数" + method.getDeclaringClass().getName());
        System.out.println("返回参数" + method.getName());
        System.out.println("返回参数" + new Gson().toJson(rvt));
    }
}

@EnableAsync
@SpringBootApplication
public class AsyncApplication {

    public static void main(String[] args) {
        ConfigurableApplicationContext context = SpringApplication.run(AsyncApplication.class, args);
        User myconf = (User) context.getBean("user");
        myconf.add("test001");
        int name = myconf.addNum("002",02);
        System.out.println("ss");
    }
}

1.事务工具类

/**
 * Created on 2019/4/6.
 *
 * @author Grak
 * @since 1.0
 */
@Component
public class TransactionUtils {

    @Autowired
    private DataSourceTransactionManager dataSourceTransactionManager;

    // 开启事务
    public TransactionStatus begin() {
        TransactionStatus transaction = dataSourceTransactionManager.getTransaction(new DefaultTransactionAttribute());
        return transaction;
    }

    // 提交事务
    public void commit(TransactionStatus transactionStatus) {
        dataSourceTransactionManager.commit(transactionStatus);
    }

    // 回滚事务
    public void rollback(TransactionStatus transactionStatus) {
        dataSourceTransactionManager.rollback(transactionStatus);
    }
}

2、添加切面类

/**
 * Created on 2019/4/6.
 *
 * @author Grak
 * @since 1.0
 */
@Component
@Aspect
public class AopSpringAspect {

    @Autowired
    private TransactionUtils transactionUtils;

    // // 异常通知
    @AfterThrowing("execution(* com.stude.aop.aspect.jdbcaspect.DemoAspect.runAspect(..))")
    public void afterThrowing() {
        System.out.println("程序已经回滚");
        // 获取程序当前事务 进行回滚
        transactionUtils.rollback(TransactionAspectSupport.currentTransactionStatus());
//        TransactionAspectSupport.currentTransactionStatus().setRollbackOnly();
    }

    // 环绕通知
    @Around("execution(* com.stude.aop.aspect.jdbcaspect.DemoAspect.runAspect(..))")
    public void around(ProceedingJoinPoint proceedingJoinPoint) throws Throwable {
        System.out.println("开启事务");
        TransactionStatus begin = transactionUtils.begin();
        proceedingJoinPoint.proceed();
        transactionUtils.commit(begin);
        System.out.println("提交事务");
    }
}

3、被监听方法

/**
 * Created on 2019/4/5.
 *
 * @author Grak
 * @since 1.0
 */
@Component
public class User {

    public void add(String message) {
        System.out.println("执行User添加方法:" + message);
    }

    public void addNum(String message, int num) {
        System.out.println("执行User添加方法:" + message + "，编号：" + num);
    }
}

4、执行方法

@SpringBootApplication
public class AopApplication {

    public static void main(String[] args) {
        ConfigurableApplicationContext ctx = SpringApplication.run(AopApplication.class, args);

        //AopAspect执行
        User myconf = (User) ctx.getBean("user");
        myconf.add("test001");

    }
}