标签:code message 对象 image gas log erb public err
简介:
SpringBoot框架中对AOP有很好的支持,简单AOP概念:
JoinPoint(连接点):类里面可以被增强的方法即为连接点,例如,想修改哪个方法的功能,那么该方法就是一个连接点。
Pointcut(切入点):对JoinPoint进行拦截的定义即为切入点,例如拦截所有insert开始的方法,这个定义即为切入点。
Advice(通知):拦截到Joinpoint之后要做的事就是通知,分为前置,后置,异常,环绕,返回通知.
Aspect(切面):Pointcut和Advice的结合。
Target(目标对象):要增强的类称为Target.
SpringBoot中,首先引入aop依赖:
<dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-aop</artifactId> </dependency>
controller:
@RestController public class UserController {
@Autowired UserService userService;
@GetMapping("/getUserById/{id}") public String getUserById(@PathVariable("id") Integer id) { return userService.getUserById(id); }
@GetMapping("/deleteUserById") public void deleteUserById(Integer id) { userService.deleteUserById(id); } }
Service:
@Service public class UserService { public String getUserById(Integer id) { System.out.println("get..."+id); return "user"; } public void deleteUserById(Integer id) { int i = 1 / 0; System.out.println("delete..."); } }
Aspect:
@Component @Aspect public class LogAspect { //切入点:返回类型 包+类+方法(参数)
@Pointcut("execution(* org.sang.aop.service.*.*(..))") public void pc1() { }
@Before(value = "pc1()") public void before(JoinPoint jp) { String name = jp.getSignature().getName(); System.out.println(name + "方法开始执行..."); }
@After(value = "pc1()") public void after(JoinPoint jp) { String name = jp.getSignature().getName(); System.out.println(name + "方法执行结束..."); }
@AfterReturning(value = "pc1()", returning = "result") public void afterReturning(JoinPoint jp, Object result) { String name = jp.getSignature().getName(); System.out.println(name + "方法返回值为:" + result); }
@AfterThrowing(value = "pc1()",throwing = "e") public void afterThrowing(JoinPoint jp,Exception e) { String name = jp.getSignature().getName(); System.out.println(name+"方法抛异常了,异常是:"+e.getMessage()); }
@Around("pc1()") public Object around(ProceedingJoinPoint pjp) throws Throwable { return pjp.proceed(); }
}
正常访问:
http://localhost:8080/getUserById/2
执行顺序:前置--service中的方法--后置--正常返回
异常:
http://localhost:8080/deleteUserById
执行顺序:前置--后置--异常返回
标签:code message 对象 image gas log erb public err
原文地址:https://www.cnblogs.com/crazy-lc/p/12331699.html