【SpringBoot】SpringAOP实现公共字段自动填充

1. 自定义注解annotation

@Target 指定可以使用注解的类型
@Retention 指定合适使用
value指定注解值得类型

import com.sky.enumeration.OperationType;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

@Target(ElementType.METHOD)
@Retention(RetentionPolicy.RUNTIME)
public @interface AutoFill {
    // 操作类型
    OperationType value();
}

2. 切面aspect

@Pointcut(“execution()”) 定义切入点
@Before(“pointcut()”) 在切入点之前执行方法

import com.sky.annotation.AutoFill;
import com.sky.constant.AutoFillConstant;
import com.sky.context.BaseContext;
import com.sky.entity.Employee;
import com.sky.enumeration.OperationType;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.Signature;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.time.LocalDateTime;
import java.time.LocalTime;

@Aspect
@Component
@Slf4j
public class AutoFillAspect {

    /**
     * 切入点
     */
    @Pointcut("execution(* com.sky.mapper.*.*(..)) && @annotation(com.sky.annotation.AutoFill)")
    public void autoFillAspectPointcut(){}

    /**
     * 切入点之前执行
     */
    @Before("autoFillAspectPointcut()")
    public void jointPoint(JoinPoint joinPoint) {

        // 获取注解里面的值
        MethodSignature methodSignature = (MethodSignature) joinPoint.getSignature();
        // 获取注解
        AutoFill annotation = methodSignature.getMethod().getAnnotation(AutoFill.class);
        OperationType operationType = annotation.value();

        // 获取参数
        Object[] args = joinPoint.getArgs();
        if (args==null || args.length==0) {
            return;
        }

        // 获取更新数据
        LocalDateTime time = LocalDateTime.now();
        Long userId = BaseContext.getCurrentId();

        Object entity = args[0];

        // 根据类型进行更新
        if (OperationType.INSERT.equals(operationType)) {
            // 反射进行更新
            try {
                Method setCreateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_TIME, LocalDateTime.class);
                Method setCreateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_USER, Long.class);


                setCreateTime.invoke(entity, time);
                setCreateUser.invoke(entity, userId);
            } catch (NoSuchMethodException e) {
                throw new RuntimeException(e);
            } catch (InvocationTargetException e) {
                throw new RuntimeException(e);
            } catch (IllegalAccessException e) {
                throw new RuntimeException(e);
            }
        } else if (OperationType.UPDATE.equals(operationType)) {
            try {
                Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                Method setUpdateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);

                // 反射更新
                setUpdateTime.invoke(entity, time);
                setUpdateUser.invoke(entity, userId);
            } catch (NoSuchMethodException e) {
                throw new RuntimeException(e);
            } catch (InvocationTargetException e) {
                throw new RuntimeException(e);
            } catch (IllegalAccessException e) {
                throw new RuntimeException(e);
            }
        }

    }
}

3. 使用自定义注解

    @AutoFill(OperationType.UPDATE)
    void update(Employee employee);

4. 枚举类型

/**
 * 数据库操作类型
 */
public enum OperationType {

    /**
     * 更新操作
     */
    UPDATE,

    /**
     * 插入操作
     */
    INSERT

}