Aspect注解的使用，实现aop事务

太过爱你忘了你带给我的痛 2022-02-23 08:04 309阅读 0赞

## **@Aspect的使用** ##

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

项目结构

## ![20190509110313910.png][] ##

@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");
    
        }
    }

[20190509110313910.png]: /images/20220223/7cc91cff248a4c05b29baa03a04a5dec.png