Question

我想在我的属性文件中以秒为单位配置fixedDelay，然后我想在@Scheduled Annotation中将其转换为millis。

我希望这可行：

@Scheduled(fixedDelayString = "#{${my.scheduler.fixed.delay} * 1000}")

但它抛出此异常

Caused by: java.lang.IllegalStateException: Encountered invalid @Scheduled method 'myMethod': Invalid fixedDelayString value "#{5 * 1000}" - cannot parse into integer
at org.springframework.scheduling.annotation.ScheduledAnnotationBeanPostProcessor.processScheduled(ScheduledAnnotationBeanPostProcessor.java:384) ~[spring-context-4.1.6.RELEASE.jar:4.1.6.RELEASE]
at org.springframework.scheduling.annotation.ScheduledAnnotationBeanPostProcessor$1.doWith(ScheduledAnnotationBeanPostProcessor.java:227) ~[spring-context-4.1.6.RELEASE.jar:4.1.6.RELEASE]

$ {my.scheduler.fixed.delay}已被正确恢复，但表达式未被重新开发。

我尝试配置自己的StringValueResolver

private static class CustomValueResolver
    implements StringValueResolver {

    private final ConfigurableBeanFactory beanFactory;

    private final ExpressionParser expressionParser;

    public CustomValueResolver(final ConfigurableBeanFactory beanFactory, final ExpressionParser expressionParser) {

        this.beanFactory = beanFactory;
        this.expressionParser = expressionParser;
    }

    @Override
    public String resolveStringValue(
        final String strVal) {

        String value = this.beanFactory.resolveEmbeddedValue(strVal);
        if (value.startsWith("#{")) {
            value = this.expressionParser.parseExpression(value).getValue(String.class);
        }
        return value;
    }
}

但我找不到注入自定义CustomValueResolver的方法。

我是对的还是错的？有另一种简单的方法

弹簧注释@ Scheduled.fixedDelayString不支持Spel

0 个答案: