Java annotations
The first indicates that the method of the parent class is overridden
The second means that the method has expired (but it can still be used, and a warning will appear)
The third means use the expired method to ignore the warning
Aop
Requirements such as certain methods require administrator privileges to run.
- Hard-code in a method that can only be run by administrators to determine whether the current user is an administrator (intrusive high)
- Use aop for faceted interception of specific methods (low intrusiveness)
Define the aspect to intercept before defining the method annotated with adminOnly and then insert the code @before before running the method
| package com.Springboot.myBoot.zujie;
import java.lang.annotation.Documented; import java.lang.annotation.Retention; import java.lang.annotation.RetentionPolicy; import java.lang.annotation.Target;
import javax.lang.model.element.Element; import javax.persistence.Inheritance;
import org.hibernate.validator.internal.xml.ElementType; import org.mockito.Incubating;
@Target({java.lang.annotation.ElementType.METHOD}) @Retention(RetentionPolicy.RUNTIME) @Inheritance @Documented public @interface Desciption { String value(); //可以不加
}
|
定义注解
| package com.Springboot.myBoot.zujie;
import org.aspectj.lang.annotation.After; import org.aspectj.lang.annotation.Aspect; import org.aspectj.lang.annotation.Before; import org.aspectj.lang.annotation.Pointcut; import org.springframework.stereotype.Component;
@Aspect @Component public class qiemian { /*@Component @component （把普通pojo实例化到spring容器中，相当于配置文件中的<bean id="" class=""/>）*/
@Pointcut("@annotation(Desciption)") public void zdy(){
}
@Before("zdy()") public void Front(){ System.out.println("我在特定的方法之前运行"); }
@After("zdy()") public void behind(){ System.out.println("我在特定的方法之前运行"); } }
|
@RequestMapping("/qiemian")
@Desciption("zdy")
public String zdy(){
System.out.println("我是一个切面方法 我加了自定义注解");
return "success";
}
一个参数 long类型
多个参数 long类型开头
两个参数 long类型开头和String
类级别的需要将注解的范围修改。Type
问号部分可以省略
获取参数
