request.getQueryString() 返回NULL

本文介绍了一个在WebSphere Application Server 6.1中遇到的问题:使用request.getQueryString()方法返回null。该问题在Tomcat环境下不会出现。通过调整代码实现方式可以解决此问题,具体做法是使用request.getAttribute(javax.servlet.forward.query_string)代替request.getQueryString()。

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今天将工程部署到WAS6.1时发现request.getQueryString()返回为NULL,在TOMCAT上是正常返回结果的.经过查找发现,应该是WAS采用的serlet api 版本的问题,改下写法就可以.如下:

The null value is returned by request.getQueryString() is due to change in requestdispatcher implementaion in servlet 2.4 specification.

The error can by resolved by using

request.getAttribute("javax.servlet.forward.query_string")

 instead of

request.getQueryString() 
 

``` private TransmitTarget generateTransmitTarget(String traceId, HttpServletRequest request) throws JsonProcessingException { String ip = HttpUtils.getRemoteIp(request); String uri = request.getRequestURI().trim(); String queryString = request.getQueryString(); String method = request.getMethod(); Quadruple quadruple = HttpUtils.apiLocationMetadata(traceId, uri, queryString); String configuration = redisClient.get(RedisUtils.apiConfigKey(quadruple.getNamespace(), quadruple.getAction(), quadruple.getVersion())); InterfaceConfig interfaceConfig = new InterfaceConfig(); if (configuration != null) { interfaceConfig = JsonUtils.getObjectMapper().readValue(configuration, InterfaceConfig.class); } else { // 接口配置为空时,检查接口是否注册,刷新注册接口,并标记未注册接口 checkApiRegisterStatus(traceId, quadruple, interfaceConfig); } SentinelUtils.initFlowRules(quadruple.getNamespace(), flowLimitConfig.getMaps().getOrDefault(quadruple.getNamespace(), flowLimitConfig.getDefaultQps())); try (Entry ignored = SphU.entry(quadruple.getNamespace())) { businessConfig.refuseBlockList(traceId, interfaceConfig.getInterfaceType(), ip); if (interfaceConfig.getHttpMethod() == null || !interfaceConfig.getHttpMethod().equalsIgnoreCase(method) || !interfaceConfig.getHttpMethod().toUpperCase(Locale.ROOT).contains(method)) { throw new MethodNotAllowedException(traceId, RespCode.METHOD_NOT_ALLOWED); } Map<String, String> headers = HttpUtils.obtainHeaders(traceId, request, ip); this.authenticate(traceId, interfaceConfig, headers); return TransmitTarget.builder().cbResourceName(StringUtils.obtainServiceName(interfaceConfig.getServerAddress())).uri(HttpUtils.generateUrl(interfaceConfig.getServerAddress(), interfaceConfig.getRealPath(), quadruple.getQueryString())).headers(headers).build(); } catch (BlockException e) { Logger.outerRequestError(this.getClass().getName(), "generateTransmitTarget", String.format("trace_id:%s, resource_name: %s rate limited, action: %s", traceId, quadruple.getNamespace(), quadruple.getAction()), e); throw new ServerBusyException(traceId, RespCode.SERVER_BUSY); } }```解释该代码段
最新发布
03-12
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