java - 配置RetryTemplate以测试除404以外的所有失败代码

我是Spring Boot的新手，无法设置RetryTemplate来重试除404以外的所有失败的异常代码。以下是我的代码：

@Bean
public RetryTemplate createRetryTemplate() {
    SimpleRetryPolicy retryPolicy = new SimpleRetryPolicy();
    retryPolicy.setMaxAttempts(maxAttempts);

    UniformRandomBackOffPolicy backOffPolicy = new UniformRandomBackOffPolicy();
    backOffPolicy.setMinBackOffPeriod((long) minBackOffPeriod);
    backOffPolicy.setMaxBackOffPeriod(maxBackOffPeriod);

    RetryTemplate retryTemplate = new RetryTemplate();
    retryTemplate.setRetryPolicy(retryPolicy);
    retryTemplate.setBackOffPolicy(backOffPolicy);
    return retryTemplate;
}

我了解我需要制定政策，但是不确定如何制定。任何帮助将不胜感激。

最佳答案

我将尝试使用ExceptionClassifierRetryPolicy来检测引发的异常的类型，并基于该异常返回不同的重试策略：

class HttpStatusRetryPolicy extends ExceptionClassifierRetryPolicy {
    public HttpStatusRetryPolicy() {
        final NeverRetryPolicy doNotRetry = new NeverRetryPolicy();
        final SimpleRetryPolicy simpleRetryPolicy = new SimpleRetryPolicy();
        // configure your RetryPolicy here:
        // retryPolicy.setMaxAttempts(maxAttempts);
        // ...
        this.setExceptionClassifier(throwable -> {
            if (throwable instanceof HttpClientErrorException.NotFound) { // 404
                return doNotRetry;
            }
            return simpleRetryPolicy;
        });
    }
}