目录

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 {
    @Override
    public 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 {
 
    @Resource
    private HelloService helloService;
    private 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

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