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spring aop代理控制

代理方式

spring aop可通过参数proxyTargetProxy控制创建代理的方式

proxyTargetProxy=true：强制使用cglib代理
proxyTargetProxy=false：目标实现类实现了接口使用jdk，没有实现接口则使用cglib

springboot 默认代理行为

# 通过参数spring.aop.proxy-target-proxy控制
1.x：proxy-target-proxy=false
2.x：proxy-target-proxy=true

默认代理行为

HelloService

public interface HelloService {String hello();
}

HelloServiceImpl

@Service
public class HelloServiceImpl implements HelloService {@Overridepublic String hello() {return "hello";}
}

HelloService2Impl

@Service
public class HelloService2Impl {public String hello(){return "hello2";}
}

CustomAspect

@Aspect
@Component
public class CustomAspect {@Pointcut("execution(* *.hello(..))")public void fun(){}@Before("fun()")public void before(JoinPoint joinPoint){System.out.print("before ==> ");MethodSignature signature = (MethodSignature) joinPoint.getSignature();Method method = signature.getMethod();System.out.println(method.getDeclaringClass().getName()+"."+method.getName());}
}

HelloController

@RestController
public class HelloController {@Resourceprivate HelloService helloService;@Resourceprivate HelloService2Impl helloService2;@RequestMapping("/hello")public String hello(){/*System.out.println("HelloController helloService.hello()："+helloService.hello());System.out.println("HelloController helloService2.hello()："+helloService2.hello());*/System.out.println(helloService.getClass().getName());System.out.println(helloService2.getClass().getName());return "success";}
}

localhost:8080/hello，控制台输出：

2022-04-23 22:32:19.334  INFO 1224 --- [           main] w.s.c.ServletWebServerApplicationContext : Root WebApplicationContext: initialization completed in 737 ms
2022-04-23 22:32:19.638  INFO 1224 --- [           main] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat started on port(s): 8080 (http) with context path ''
2022-04-23 22:32:19.646  INFO 1224 --- [           main] com.example.demo.DemoApplication         : Started DemoApplication in 1.351 seconds (JVM running for 1.774)
2022-04-23 22:32:23.915  INFO 1224 --- [nio-8080-exec-1] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring DispatcherServlet 'dispatcherServlet'
2022-04-23 22:32:23.915  INFO 1224 --- [nio-8080-exec-1] o.s.web.servlet.DispatcherServlet        : Initializing Servlet 'dispatcherServlet'
2022-04-23 22:32:23.916  INFO 1224 --- [nio-8080-exec-1] o.s.web.servlet.DispatcherServlet        : Completed initialization in 1 ms
before ==> com.example.demo.controller.HelloController.hello# 无论是否实现接口都使用cglib创建代理
com.example.demo.service.impl.HelloServiceImpl$$EnhancerBySpringCGLIB$$b6dcbbe7
com.example.demo.service.impl.HelloService2Impl$$EnhancerBySpringCGLIB$$589ac389

修改代理行为

application.properties

spring.aop.proxy-target-class=false

localhost:8080/hello，控制台输出：

2022-04-23 22:40:14.300  INFO 1237 --- [           main] w.s.c.ServletWebServerApplicationContext : Root WebApplicationContext: initialization completed in 935 ms
2022-04-23 22:40:14.639  INFO 1237 --- [           main] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat started on port(s): 8080 (http) with context path ''
2022-04-23 22:40:14.647  INFO 1237 --- [           main] com.example.demo.DemoApplication         : Started DemoApplication in 1.594 seconds (JVM running for 2.17)
2022-04-23 22:40:17.156  INFO 1237 --- [nio-8080-exec-1] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring DispatcherServlet 'dispatcherServlet'
2022-04-23 22:40:17.156  INFO 1237 --- [nio-8080-exec-1] o.s.web.servlet.DispatcherServlet        : Initializing Servlet 'dispatcherServlet'
2022-04-23 22:40:17.157  INFO 1237 --- [nio-8080-exec-1] o.s.web.servlet.DispatcherServlet        : Completed initialization in 1 ms
before ==> com.example.demo.controller.HelloController.hello# helloServiceImpl使用jdk创建代理对象
com.sun.proxy.$Proxy56# helloService2Impl使用cglib创建代理对象
com.example.demo.service.impl.HelloService2Impl$$EnhancerBySpringCGLIB$$f6915580