Spring spel获取自定义注解参数值方式

package com.xxx.mall.order.service.component; 
import java.lang.annotation.*;
 

@Retention(RetentionPolicy.RUNTIME)
@Target({ElementType.METHOD})
@Documented
public @interface StockWarnCollect {
 
    
    String customerId();
 
    
    String source();
 
    
    String pageType();
}

@Override
@StockWarnCollect(customerId = "#customerId", source = "#source", pageType = "2")
public Map<String, Object> validateCarts(Long customerId, Set<Long> userSelectedIds, Short source, JSONArray couponInfo){
    // 省略
}

import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang.exception.ExceptionUtils;
import org.apache.commons.lang3.StringUtils;
import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.Signature;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.core.LocalVariableTableParameterNameDiscoverer;
import org.springframework.expression.EvaluationContext;
import org.springframework.expression.Expression;
import org.springframework.expression.ExpressionParser;
import org.springframework.expression.spel.standard.SpelExpressionParser;
import org.springframework.expression.spel.support.StandardEvaluationContext;
import org.springframework.stereotype.Component; 
import java.lang.reflect.Method;
 

@Aspect
@Component
@Slf4j
public class StockWarnCollectAop { 
    @Pointcut(value = "@annotation(com.xxx.mall.order.service.component.StockWarnCollect)")
    public void collectStockWarn(){}
 
    @Around(value = "collectStockWarn()")
    public Object around(ProceedingJoinPoint pjp) throws Throwable {
 
        Method targetMethod = this.getTargetMethod(pjp);
        StockWarnCollect stockWarnCollect = targetMethod.getAnnotation(StockWarnCollect.class);
 
        // spel信息
        String customerIdSpel = stockWarnCollect.customerId();
        String sourceSpel = stockWarnCollect.source();
        Integer pageType = null;  // 操作类型，纯字符串
        if (StringUtils.isNotBlank(stockWarnCollect.pageType())) {
            pageType = Integer.valueOf(stockWarnCollect.pageType());
        }
 
        // 客户id、来源解析
        ExpressionParser parser = new SpelExpressionParser();
        LocalVariableTableParameterNameDiscoverer discoverer = new LocalVariableTableParameterNameDiscoverer();
        String[] params = discoverer.getParameterNames(targetMethod); 
        Object[] args = pjp.getArgs();
 
        EvaluationContext context = new StandardEvaluationContext();
        for (int len = 0; len < params.length; len++) {
            context.setVariable(params[len], args[len]);
        }
        Expression expression = parser.parseExpression(customerIdSpel);
        Long customerId = expression.getValue(context, Long.class);
 
        expression = parser.parseExpression(sourceSpel);
        Short source = expression.getValue(context, Short.class);
        log.info("collectStockWarn customerId:{}, source:{}", customerId, source);
 
        // 业务逻辑处理
        Object result = null;
        try {
            result = pjp.proceed();
        } catch (Throwable e) {
            log.info("collectStockWarn watchs creating order errorMsg:{}", ExceptionUtils.getStackTrace(e));
            if (e instanceof MallException) {
 
            } else {    // 未知错误
            
            } 
            throw e;
        } 
        try {
            if (result != null) {            
            }
        } catch (Exception e) {
            log.error("collectStockWarn process error, errorMsg:{}", ExceptionUtils.getStackTrace(e));
        } 
        return result; 
    } 
    
    private Method getTargetMethod(ProceedingJoinPoint pjp) throws NoSuchMethodException {
        Signature signature = pjp.getSignature();
        MethodSignature methodSignature = (MethodSignature)signature;
        Method agentMethod = methodSignature.getMethod();
        return pjp.getTarget().getClass().getMethod(agentMethod.getName(),agentMethod.getParameterTypes());
    }
}

    //@Value能修饰成员变量和方法形参
    //#{}内就是表达式的内容
    @Value("#{表达式}")
    public String arg;

<bean id="xxx" class="com.java.XXXXX.xx">
    <!-- 同@Value,#{}内是表达式的值，可放在property或constructor-arg内 -->
    <property name="arg" value="#{表达式}">
</bean>

public class SpELTest { 
    public static void main(String[] args) {
 
        //创建ExpressionParser解析表达式
        ExpressionParser parser = new SpelExpressionParser();
        //表达式放置
        Expression exp = parser.parseExpression("表达式");
        //执行表达式，默认容器是spring本身的容器：ApplicationContext
        Object value = exp.getValue();
        
        
        //创建一个虚拟的容器EvaluationContext
        StandardEvaluationContext ctx = new StandardEvaluationContext();
        //向容器内添加bean
        BeanA beanA = new BeanA();
        ctx.setVariable("bean_id", beanA);
        
        //setRootObject并非必须；一个EvaluationContext只能有一个RootObject，引用它的属性时，可以不加前缀
        ctx.setRootObject(XXX);
        
        //getValue有参数ctx，从新的容器中根据SpEL表达式获取所需的值
        Object value = exp.getValue(ctx);
    }
}

// 如果属性文件没有spelDefault.value，则会报错
    //  @Value("${spelDefault.value}")
    //  private String spelDefault2;
 
    // 使用default.value设置值，如果不存在则使用默认值
    @Value("${spelDefault.value:127.0.0.1}")
    private String spelDefault;

    // SpEL：调用字符串Hello World的concat方法
    @Value("#{'Hello World'.concat('!')}")
    private String helloWorld;
 
    // SpEL: 调用字符串的getBytes方法，然后调用length属性
    @Value("#{'Hello World'.bytes.length}")
    private String helloWorldbytes;

// SpEL: 传入一个字符串，根据","切分后插入列表中， #{}和${}配置使用(注意单引号，注意不能反过来${}在外面，#{}在里面)
    @Value("#{'${server.name}'.split(',')}")
    private List<String> servers;

// SpEL: 注意不能反过来${}在外面，#{}在里面，这个会执行失败
    @Value("${#{'HelloWorld'.concat('_')}}")
    private List<String> servers2;