@Aspect@Order各个通知的执行顺序
两个切面类：【记录日志】和【判断参数】，分别对应顺序 @Order(0) 和@Order(1) 。
本文只是将重点说下 执行顺序 这么回事哈哈哈
代码
【业务类】
@Controller
public class LoginController {
//向外面抛出异常
public void loginWithThrow(String username, String password) throws Exception {
if (username == null || password == null) {
throw new Exception("登录信息不可为空啊");
}
System.out.println("LoginController#login...");
}
//抛出异常自己捕获的情况
public void loginWithTryCatch(String username, String password) {
try{
if (username == null || password == null) {
throw new Exception("登录信息不可为空啊");
}
System.out.println("LoginController#login...");
}catch (Exception e){
e.printStackTrace();
}
}
}
【切面类】
@Order(0)
@Aspect
@Component
public class LogAspect {
//抽出共通的execution用的
//com.yuki.demo.aop.aspect 包或者子包下所有类的方法
@Pointcut("execution(* com.yuki.demo.aop.aspect..*.*(..))")
public void pointcut(){
}
//前置通知
// @Before("execution(public void com.yuki.demo.aop.aspect.LoginController.*(String,String))")
@Before("pointcut()")
public void before() {
System.out.println("LogAspect#before...");
}
//环绕通知
//ProceedingJoinPoint 只有环绕通知有
@Around("execution(public void com.yuki.demo.aop.aspect.LoginController.*(String,String))")
public void around(ProceedingJoinPoint joinPoint) throws Throwable {
System.out.println("LogAspectA#around开始...");
//代理方法的执行，如果没有joinPoint.proceed() ,则前置通知@Before 不会执行，其它的通知正常
joinPoint.proceed();
//执行方法之后，如果joinPoint.proceed() 抛出了异常，则该句不会执行，抛出异常后直接跳出了aroud方法了
System.out.println("LogAspectA#around结束...");
}
//后置通知（只要连接点被执行，不管是否抛出异常）
@After("execution(public void com.yuki.demo.aop.aspect.LoginController.*(String,String))")
public void after() {
System.out.println("LogAspect#after...");
}
//异常通知（只有在joinPoint.proceed()方法执行向外面抛出了异常，才会执行该通知）
@AfterThrowing("execution(public void com.yuki.demo.aop.aspect.LoginController.*(String,String))")
public void afterThrowing() {
System.out.println("LogAspect#afterThrowing...");
}
//正常的返回通知通知（正常结束了才会执行该通知）
@AfterReturning("execution(public void com.yuki.demo.aop.aspect.LoginController.*(String,String))")
public void afterReturning() {
System.out.println("LogAspect#afterReturning...");
}
}
【切面类】
@Order(1)
@Aspect
@Component
public class SignAspect {
@Around("execution(public void com.yuki.demo.aop.aspect.LoginController.*(String,String))")
public void around(ProceedingJoinPoint joinPoint) throws Throwable {
System.out.println("SignAspect#around开始...");
joinPoint.proceed();
System.out.println("SignAspect#around结束...");
}
}
【启动配置】
省略。。。非重点
【测试类】
@SpringBootTest
class AopApplicationTests {
@Autowired
private LoginController loginController;
@Test
void contextLoads() {
loginController.loginWithTryCatch("yuki", "1234");
}
}
【控制台输出】
LogAspectA#around开始...
LogAspect#before...
SignAspect#around开始...
LoginController#login...
SignAspect#around结束...
LogAspectA#around结束...
LogAspect#after...
LogAspect#afterReturning...
小结
spring AspectJ order(顺序)
@Aspect
@Order(2)
public class HelloWorldAspectAnnotation {
//定义前置通知，注意这里是sayHello2
//使用@Before进行前置通知声明，其中value用于定义切入点表达式或引用命名切入点
@Before(value="execution(* com.boventech..*.sayHello2(..))&& args(param)",argNames="param")
public void beforeAdvice(JoinPoint joinPoint,String param) {
System.out.println(1);
System.out.println("=======================");
System.out.println("===param:" + param);
System.out.println("=======================");
System.out.println(joinPoint.getArgs().length);
System.out.println("=======================");
System.out.println(joinPoint.toString());
System.out.println("=======================");
System.out.println(joinPoint.getTarget());
System.out.println("=======================");
System.out.println(joinPoint.getThis());
System.out.println("=======================");
System.out.println("===========before advice");
}
@AfterReturning(value="execution(* com.boventech..*.sayHello2(..))&& args(param)",argNames="param",pointcut="execution(* com.boventech..*.sayHello2(..))&& args(param)")
public void afterFinallyAdvice(JoinPoint joinPoint,String param) {
System.out.println("param:"+param);
System.out.println("===========");
System.out.println("===========after finally advice");
}
}@Aspect
@Order(1)
public class HelloWorldAspectAnnotation2 {
//定义前置通知，注意这里是sayHello2
//使用@Before进行前置通知声明，其中value用于定义切入点表达式或引用命名切入点
@Before(value="execution(* com.boventech..*.sayHello2(..))&& args(param)",argNames="param")
public void beforeAdvice(JoinPoint joinPoint,String param) {
System.out.println(2);
System.out.println("=======================");
}
@AfterReturning(value="execution(* com.boventech..*.sayHello2(..))&& args(param)",argNames="param",pointcut="execution(* com.boventech..*.sayHello2(..))&& args(param)")
public void afterFinallyAdvice(JoinPoint joinPoint,String param) {
System.out.println("order:" + 2);
}
}public class AopAnnotationTest {
@Test
public void testHelloworld() {
ApplicationContext ctx = new ClassPathXmlApplicationContext("/helloWorld2.xml");
IHelloWorld2Service helloworldService =ctx.getBean("helloWorld2Service", IHelloWorld2Service.class);
String param = "12";
helloworldService.sayHello2(param);
}
}<aop:aspectj-autoproxy/>
<bean id="helloWorld2Service" class="com.boventech.learning.serviceImpl.HelloWorld2ServiceImpl"/>
<bean id="aspect"
class="com.boventech.learning.aspect.HelloWorldAspectAnnotation"/>
<bean id="aspect2"
class="com.boventech.learning.aspect.HelloWorldAspectAnnotation2"/>以上为个人经验，希望能给大家一个参考，也希望大家多多支持编程网。
