SpringBoot学习笔记一

SpringBoot学习一

自定义注解 , aop切面

一 .容器启动类

    package com.casking.chcs.modules.test.web; 
  
    import org.springframework.context.annotation.AnnotationConfigApplicationContext; 
  
    import com.casking.chcs.modules.test.service.AopConfig; 
  
    import com.casking.chcs.modules.test.service.DemoAnnotationService; 
  
    public class Main { 
  
         public static void main(String[] args) { 
  
               //初始化容器 
  
               AnnotationConfigApplicationContext countext = new AnnotationConfigApplicationContext(AopConfig.class); 
  
               //获得Bean 
  
               DemoAnnotationService bean = countext.getBean(DemoAnnotationService.class); 
  
               //调用方法 
  
               bean.add(); 
  
               countext.close(); 
  
         } 
  
    }

二 . 扫描配置类

    package com.casking.chcs.modules.test.service; 
  
    import org.springframework.context.annotation.ComponentScan; 
  
    import org.springframework.context.annotation.Configuration; 
  
    import org.springframework.context.annotation.EnableAspectJAutoProxy; 
  
    /** 
  
     * 
  
     * 配置类 
  
     * @author Anson 
  
     * 
  
     */ 
  
    @Configuration //注册被spring管理 
  
    @ComponentScan("com.casking.chcs.modules.test.service") //指定扫描范围 
  
    @EnableAspectJAutoProxy //注解开启对aspectJ的支持 
  
    public class AopConfig { 
  
    }

三 . 调用方法类

    package com.casking.chcs.modules.test.service; 
  
    import org.springframework.stereotype.Service; 
  
    @Service 
  
    public class DemoAnnotationService { 
  
         @Action(name = "注解式拦截的add操作", hello = "hello,我在这") 
  
         public void add() { 
  
               System.out.println("调用了add方法"); 
  
         }; 
  
    }

四 . 自定义注解类

    package com.casking.chcs.modules.test.service; 
  
    import java.lang.annotation.Documented; 
  
    import java.lang.annotation.ElementType; 
  
    import java.lang.annotation.Retention; 
  
    import java.lang.annotation.RetentionPolicy; 
  
    import java.lang.annotation.Target; 
  
    /** 
  
     * 自定义注解(元数据) 
  
     * @author Anson 
  
     * 
  
     */ 
  
    @Target(ElementType.METHOD) 
  
    @Retention(RetentionPolicy.RUNTIME) 
  
    @Documented 
  
    public @interface Action { 
  
         String name(); 
  
         String hello(); 
  
    }

五 .aop切面类

    package com.casking.chcs.modules.test.service; 
  
    import java.lang.reflect.Method; 
  
    import org.aspectj.lang.JoinPoint; 
  
    import org.aspectj.lang.annotation.After; 
  
    import org.aspectj.lang.annotation.Aspect; 
  
    import org.aspectj.lang.annotation.Pointcut; 
  
    import org.aspectj.lang.reflect.MethodSignature; 
  
    import org.springframework.stereotype.Component; 
  
    /** 
  
     * 编写切面 
  
     * 
  
     * @author Anson 
  
     * 
  
     */ 
  
    @Aspect // 注解声明一个切面 
  
    @Component // 受spring管理的容器 
  
    public class LogAspect { 
  
         @Pointcut("@annotation(com.casking.chcs.modules.test.service.Action)") // 注解声明切点 
  
         public void annotationPointcut() { 
  
         }; 
  
         @After("annotationPointcut()") 
  
         public void after(JoinPoint joinPoint) { 
  
               MethodSignature methodSignature = (MethodSignature) joinPoint.getSignature(); 
  
               Method method = methodSignature.getMethod(); 
  
               Action annotation = method.getAnnotation(Action.class); 
  
               System.out.println("注解式拦截 : " + annotation.name()); 
  
               System.out.println("????: " + annotation.hello()); 
  
         } 
  
    }

六 . 输出结果

SpringBoot学习笔记一

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