Question

我正在尝试使用像这样的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)

我在做什么以及如何解决它？

更新： -

我也试过这个网址，但它对我没用。我刚刚用{@resourceId}

替换了{{@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)

Answer 1

RestTemplate似乎没有办法忽略{...}。相反，请从URI值生成String（不包含{}}。

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();

并使用重载的getForObject方法，该方法需要URI。

Answer 2

你应该看到RestTemplate的秘密。 getForObject的方法需要三个参数，比如

public <T> T getForObject(String url, Class<T> responseType, Object... urlVariables)

＆＃39; url＆＃39;是网址前缀的一部分（在＆＃39;？＆＃39;之前）和＆＃39; urlVariables＆＃39;是一组参数。

IllegalArgumentException：RestTemplate没有足够的变量值？

2 个答案: