关于java:Aop实现自动填充字段值

需要：主动填充更新工夫创立工夫，创立用户和更新用户。

自定义注解：OperationType类是一个枚举

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

OperationType枚举类

/** * 数据库操作类型 */    public enum OperationType {/** * 更新操作 */    UPDATE,/** * 插入操作 */    INSERT}

应用aop并且申明一个事务

package com.sky.aspect;import com.sky.annotation.AutoFill;import com.sky.constant.AutoFillConstant;import com.sky.context.BaseContext;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.util.Objects;@Aspect@Component@Slf4jpublic class AutoFillAspect {@Pointcut("execution(* com.sky.mapper.*.*(..)) && @annotation(com.sky.annotation.AutoFill)")public void pt() {}@Before("pt()")public void autoFill(JoinPoint joinPoint) {    //获取签名对象    MethodSignature signature = (MethodSignature) joinPoint.getSignature();    //获取办法上注解    AutoFill annotation = signature.getMethod().getAnnotation(AutoFill.class);    OperationType value = annotation.value();    //解析注解是减少还是更新    Object[] args = joinPoint.getArgs();    if (Objects.isNull(args) || args.length == 0) {        return;    }    Object target = args[0];    LocalDateTime now = LocalDateTime.now();    Long currentId = BaseContext.getCurrentId();    Class<?> clazz = target.getClass();    if (value == OperationType.INSERT) {        try {            Method setCreateTimeMethod = clazz.getDeclaredMethod(AutoFillConstant.SET_CREATE_TIME, LocalDateTime.class);            Method setCreateUserMethod = clazz.getDeclaredMethod(AutoFillConstant.SET_CREATE_USER, Long.class);            setCreateTimeMethod.invoke(target,now);            setCreateUserMethod.invoke(target,currentId);            autoFillUpdateMethod(now,currentId,clazz,target);        } catch (Exception e) {            e.printStackTrace();        }    } else if (value == OperationType.UPDATE) {        try {            autoFillUpdateMethod(now,currentId,clazz,target);        } catch (Exception e) {            e.printStackTrace();        }    }}private void autoFillUpdateMethod(LocalDateTime now, Long id, Class<?> clazz, Object target) throws Exception {    Method setUpdateTimeMethod = clazz.getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);    Method setUpdateUserMethod = clazz.getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);    setUpdateTimeMethod.invoke(target,now);    setUpdateUserMethod.invoke(target,id);}

}