aop自动注入字段-优快云博客

本文链接：https://blog.youkuaiyun.com/weixin_44204751/article/details/130257472

该文描述了一个基于SpringBoot的自动注入配置，通过启用`@EnableAutoInjectValue`注解来导入`AutoInjectValueConfigurationRegistrar`注册bean。AOP切面`AutoInjectValueAspect`用于在插入和更新数据库操作时自动设置创建人和更新人信息，依赖于`UserDtoContextHolder`中的用户上下文信息。

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开启自动注入配置注解

package com.yh.watercloud.dynamic;

import org.springframework.context.annotation.Import;

import java.lang.annotation.*;

/**
 * 开启自动注入配置
 *
 * @Description
 * @Author wzq
 * @Date 2023/4/19 11:48
 **/
@Documented
@Target(ElementType.TYPE)
@Retention(RetentionPolicy.RUNTIME)
@Import(AutoInjectValueConfigurationRegistrar.class)
public @interface EnableAutoInjectValue {

    boolean enable() default true;

}

import bean 注册配置

package com.yh.watercloud.dynamic;

import org.apache.dubbo.config.spring.context.annotation.EnableDubboConfig;
import org.springframework.beans.factory.support.BeanDefinitionRegistry;
import org.springframework.beans.factory.support.RootBeanDefinition;
import org.springframework.context.annotation.ImportBeanDefinitionRegistrar;
import org.springframework.core.annotation.AnnotationAttributes;
import org.springframework.core.type.AnnotationMetadata;

/**
 * AutoInjectValueConfigurationRegistrar
 * import bean 注册配置
 *
 * @Description
 * @Author wzq
 * @Date 2023/4/19 13:05
 **/
public class AutoInjectValueConfigurationRegistrar implements ImportBeanDefinitionRegistrar {
    @Override
    public void registerBeanDefinitions(AnnotationMetadata importingClassMetadata, BeanDefinitionRegistry registry) {
        AnnotationAttributes attributes = AnnotationAttributes.fromMap(importingClassMetadata.getAnnotationAttributes(EnableAutoInjectValue.class.getName()));
        boolean enable = attributes.getBoolean("enable");
        if (enable) {
            RootBeanDefinition root = new RootBeanDefinition(AutoInjectValueAspect.class);
            registry.registerBeanDefinition("autoInjectValueAspect", root);
        }
    }
}

注入aop切面

package com.yh.watercloud.dynamic;

import cn.hutool.core.util.ObjectUtil;
import com.yh.watercloud.common.constant.CommonConstants;
import com.yh.watercloud.common.context.UserDtoContextHolder;
import com.yh.watercloud.common.domain.BaseDO;
import com.yh.watercloud.common.exception.GlobalException;
import com.yh.watercloud.common.utils.CodeMsg;
import com.yh.watercloud.common.utils.UserDto;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.springframework.boot.autoconfigure.condition.ConditionalOnBean;
import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
import org.springframework.context.annotation.DependsOn;
import org.springframework.stereotype.Component;

/**
 * 自动注入sql实体值：创建人等
 *
 * @Description
 * @Author wzq
 * @Date 2023/4/19 10:49
 **/
@Slf4j
@Aspect
public class AutoInjectValueAspect {

    @Pointcut("( execution(* com.yh.watercloud..*.dao..*.insert(..)) ||" +
            " execution(* com.yh.watercloud..*.dao..*.updateById(..)) ||" +
            " execution(* com.yh.watercloud..*.dao..*.update(..)) )")
    public void pointCut() {
    }

    @Before("pointCut()")
    public void before(JoinPoint joinPoint) throws Throwable {
        log.info("进入了自动赋值sql实体的切面");
        //方法名
        String methodName = joinPoint.getSignature().getName();
        //获取参数
        Object[] args = joinPoint.getArgs();
        Object param1 = args[0];

        if (param1 instanceof BaseDO) {
            BaseDO baseDO = (BaseDO) param1;
            UserDto userDto = UserDtoContextHolder.get();
            if (methodName.contains("insert")) {
                if (userDto != null) {
                    baseDO.setCreatorId(userDto.getId());
                    baseDO.setCreateBy(userDto.getName());
                    baseDO.setUpdaterId(userDto.getId());
                    baseDO.setUpdatedBy(userDto.getName());
                }
            } else if (methodName.contains("update")) {
                baseDO.setUpdaterId(userDto.getId());
                baseDO.setUpdatedBy(userDto.getName());
            }
        }
    }

}

用户信息上下文线程变量

package com.yh.watercloud.common.context;

import com.yh.watercloud.common.utils.UserDto;

/**
 * 用户信息上下文
 *
 * @Description
 * @Author wzq
 * @Date 2023/4/19 13:52
 **/
public class UserDtoContextHolder {

    /**
     * 登陆用户信息
     */
    private static final ThreadLocal<UserDto> contextHolder = new ThreadLocal<UserDto>() {
        @Override
        protected UserDto initialValue() {
            return new UserDto();
        }
    };

    public static void set(UserDto userDto) {
        contextHolder.set(userDto);
    }

    public static UserDto get() {
        return contextHolder.get();
    }

    public static void clear() {
        contextHolder.remove();
    }

}

在过滤器或者Controller的切面中赋值，返回时清空

before：
//放入本地线程变量中
UserDtoContextHolder.set(user);

AfterReturning：
//清空本地线程变量
UserDtoContextHolder.clear();