Question

是否可以使用Spring RestTemplate而不使用Exceptions来处理状态为500的http响应？

        RestTemplate restTemplate = new RestTemplate();
        try {
            response = restTemplate.getForEntity(probe.getUrl(), String.class);
            boolean isOK = response.getStatusCode() == HttpStatus.OK;
            // would be nice if 500 would also stay here
        }
        catch (HttpServerErrorException exc) {
            // but seems only possible to handle here...
        }

Answer 1

如果使用springmvc，则可以使用注释@ControllerAdvice创建控制器。在控制器中写：

@ExceptionHandler(HttpClientErrorException.class)
public String handleXXException(HttpClientErrorException e) {
    log.error("log HttpClientErrorException: ", e);
    return "HttpClientErrorException_message";
}

@ExceptionHandler(HttpServerErrorException.class)
public String handleXXException(HttpServerErrorException e) {
    log.error("log HttpServerErrorException: ", e);
    return "HttpServerErrorException_message";
}
...
// catch unknown error
@ExceptionHandler(Exception.class)
public String handleException(Exception e) {
    log.error("log unknown error", e);
    return "unknown_error_message";
}

和DefaultResponseErrorHandler抛出这两种例外：

@Override
public void handleError(ClientHttpResponse response) throws IOException {
    HttpStatus statusCode = getHttpStatusCode(response);
    switch (statusCode.series()) {
        case CLIENT_ERROR:
            throw new HttpClientErrorException(statusCode, response.getStatusText(),
                    response.getHeaders(), getResponseBody(response), getCharset(response));
        case SERVER_ERROR:
            throw new HttpServerErrorException(statusCode, response.getStatusText(),
                    response.getHeaders(), getResponseBody(response), getCharset(response));
        default:
            throw new RestClientException("Unknown status code [" + statusCode + "]");
    }
}

您可以在控制器建议中使用：e.getResponseBodyAsString();，e.getStatusCode(); blabla，以便在发生异常时获取响应消息。

Answer 2

未经测试，但您可能只是use a custom ResponseErrorHandler，而不是DefaultResponseErrorHandler，或者扩展了DefaultResponseErrorHandler，但会覆盖hasError()。

如果Http状态为500，Spring RestTemplate将始终抛出异常

2 个答案: