注解解析SPEL表达式完成切面

Luckily_君

已于 2024-08-28 17:44:29 修改

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分类专栏： java aop spl表达式文章标签： spring boot

于 2024-06-24 18:31:14 首次发布

本文链接：https://blog.youkuaiyun.com/qq_27863515/article/details/139933512

版权

1、创建ValidateTask切面

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;


@Target({ElementType.TYPE,ElementType.METHOD,ElementType.PARAMETER})
@Retention(RetentionPolicy.RUNTIME)
@Documented
public @interface ValidateTask {

    String expression() default "";

}

2、前置通知执行过程（前置通知、环绕通知）

import com.demo.qm.aop.parser.CachedExpParser;
import com.demo.aop.parser.ExpEvalContext;
import com.demo.aop.parser.MapperRouterInvocation;
import com.demo.validate.JMException;
import java.lang.reflect.Method;
import lombok.AllArgsConstructor;
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.aspectj.lang.reflect.MethodSignature;
import org.springframework.core.annotation.Order;
import org.springframework.stereotype.Component;

@Slf4j
@Aspect
@Order(1)
@Component
@AllArgsConstructor
public class ValidateTaskAspect {

    @Pointcut("@annotation(com.lachesis.windranger.qm.aop.ValidateTask)")
    public void pointCut() {
    }


    @Before(value = "pointCut()")
    public void validateTask(JoinPoint joinPoint) {
        try {
            MapperRouterInvocation invocation = MapperRouterInvocation.newInstance(joinPoint);
            CachedExpParser cachedExpParser = CachedExpParser.newInstance(invocation);
            ExpEvalContext evalContext = cachedExpParser.createEvalContext(invocation);
            MethodSignature methodSignature = (MethodSignature) joinPoint.getSignature();
            Method method = methodSignature.getMethod();
            ValidateTask task = method.getAnnotation(ValidateTask.class);
            // String exp = "@taskValidateService.validatePlanTask(#p0,#p1,#p2)";
            // String exp = "@taskValidateService.validatePlanTask(#p0.taskCode,#p0.status,#p0.level)";
            // 从注解获取表达式，执行表达式
            cachedExpParser.parse(evalContext, task.expression());
        } catch (JMException jmException){
            throw jmException;
        }catch (Exception exception) {
            log.error("执行

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