IllegalArgumentException：RestTemplate没有足够的变量值吗？
我试图像这样使用RestTemplate执行URL –
public static void main(String[] args) throws UnsupportedEncodingException { RestTemplate restTemplate = new RestTemplate(); String url = "http://ptr.vip.host.com/pss/repositories/pssdb/branches/main/query/Service[@alias=" + "hello" + "].serviceInstances.runsOn{@resourceId}?allowScan=true&limit=10000&skip=0"; try { String response = restTemplate.getForObject(url, String.class); System.out.println(response); } catch (RestClientException ex) { ex.printStackTrace(); } } 但每次我都会收到这样的错误 –
Exception in thread "main" java.lang.IllegalArgumentException: Not enough variable values available to expand '@resourceId' at org.springframework.web.util.UriComponents$VarArgsTemplateVariables.getValue(UriComponents.java:272)
我正在做什么以及如何解决它？
更新： –
我也尝试过这个url，它对我没用。 我刚刚用{{@resourceId}}替换了{@resourceId} {{@resourceId}}
String url = "http://ptr.vip.host.com/pss/repositories/pssdb/branches/main/query/Service[@alias=" + "hello" + "].serviceInstances.runsOn{{@resourceId}}?allowScan=true&limit=10000&skip=0";
更新2
这是代码 –
try { UriComponentsBuilder builder = UriComponentsBuilder .fromPath("http://ptr.vip.str.host.com/pss/repositories/pssdb/branches/main/query/Service[@alias=" + "hello" + "].serviceInstances.runsOn{@resourceId}?allowScan=true&limit=10000&skip=0"); UriComponents uriComponents = builder.build(); URI uri = uriComponents.toUri(); String response = restTemplate.getForObject(uri, String.class); System.out.println(response); } catch (RestClientException ex) { ex.printStackTrace(); }
错误是 –
Exception in thread "main" java.lang.IllegalArgumentException: URI is not absolute at java.net.URI.toURL(URI.java:1095) at org.springframework.http.client.SimpleClientHttpRequestFactory.createRequest(SimpleClientHttpRequestFactory.java:109) at org.springframework.http.client.support.HttpAccessor.createRequest(HttpAccessor.java:76) at org.springframework.web.client.RestTemplate.doExecute(RestTemplate.java:479) at org.springframework.web.client.RestTemplate.execute(RestTemplate.java:460) at org.springframework.web.client.RestTemplate.getForObject(RestTemplate.java:228)
似乎RestTemplate没有忽略{...} 。 相反，从String值生成URI （不带double {} ）。
String url = "http://ptr.vip.host.com/pss/repositories/pssdb/branches/main/query/Service[@alias=" + "hello" + "].serviceInstances.runsOn{@resourceId}?allowScan=true&limit=10000&skip=0"; UriComponentsBuilder builder = UriComponentsBuilder.fromPath(url); UriComponents uriComponents = builder.build(); URI uri = uriComponents.toUri();
并使用带有URI的重载getForObject方法。
你应该看到RestTemplate的秘密。 getForObject的方法需要三个参数，比如
public T getForObject(String url, Class responseType, Object... urlVariables)
‘url’是url前缀的一部分（在’？’前面），’urlVariables’是一个参数数组。