使用 Rest api 在 Spring Boot 中不起作用答案

【问题标题】：Consuming Rest api not working in Spring Boot使用 Rest api 在 Spring Boot 中不起作用
【发布时间】：2021-09-23 08:50:33
【问题描述】：

执行后

ResponseEntity<RetrieveAllAttributes> response = 
restTemplate.exchange(BASE_URL + attrPath + shortname + "&attributes=*", HttpMethod.GET, entity, RetrieveAllAttributes.class);

我收到org.springframework.web.client.HttpClientErrorException$NotAcceptable: 406 Not Acceptable: [no body]

我在关注this 文章。

这是我的 HttpEntity：

    HttpHeaders headers = new HttpHeaders();
    headers.set("Cookie", sessionScopedLdapUser.getToken().get("jsession") + ";" + sessionScopedLdapUser.getToken().get("tpa2"));
                
    headers.set("CSRFToken", sessionScopedLdapUser.getToken().get("csrf"));
              
    HttpEntity<RetrieveAllAttributes> entity = new HttpEntity<RetrieveAllAttributes>(new RetrieveAllAttributes(), headers);

当我改用 HttpEntity<String> 并获得一个 String 类型的 ResponseEntity 时，我可以看到响应正文

[
{"_links":
{"formTemplate":{"href":"xx"},"self":{"href":"xxx","title":"xxx"},"erparent":{"href":"xxx"}},
"_attributes":
{"gender":"F","display":"xx","number":"01000040","mail":"xxx ","fullname":"xxx","title":"Frau","source":"H","givenname":"xxx","erroles":["erpersonstatus":"ACTIVE","postaladdress":"xxx","xhortname":"xxx",}
}
]

我也尝试将 JsonObject 和 JsonNodes 与 ResponseEntity<String> 一起使用，但无法正常工作。我无法检索 href 的值：

    if(response.getStatusCode() == HttpStatus.OK){
              ObjectMapper mapper = new ObjectMapper();
              JsonNode rootNode = mapper.readTree(response.getBody());
    
              JsonNode self_href = rootNode.path("self").path("href"); //---> it does not find the node 
              String hrefAsText = self_href.asText();

有什么建议吗？

这里是我的消费类：

    @JsonIgnoreProperties(ignoreUnknown = true)
      public class RetrieveAllAttributes {
          private Links _links;
          private Attributes _attributes;
      
          ... getters and setters
      }
  
      @JsonIgnoreProperties(ignoreUnknown = true)
      public class Attributes {
      
          private String id;  
          .... getters and setters
  
      }
  
  @JsonIgnoreProperties(ignoreUnknown = true)
  public class Links {
      private Self self;
      .... getters and setters
  }
  
  @JsonIgnoreProperties(ignoreUnknown = true)
  public class Self {
      private String href;
      ... getters and setters
  }

【问题讨论】：

标签： spring-boot resttemplate

【解决方案1】：

我能够解决这个问题，只需将 restTemplate 响应作为字符串返回：

responseEntity<String> response = restTemplate.exchange(BASE_URL + attrPath + shortname + "&attributes=*", HttpMethod.GET, entity, String.class);
if(response.getStatusCode() == HttpStatus.OK){
         // parse response body to a JSON object without the first and and last character ie. [ ]
         String body = response.getBody().substring(1, response.getBody().length() - 1);
         JSONObject bodyJson = new JSONObject(body);
    
         // parse value for user href link 
         JSONObject hrefJson = bodyJson.getJSONObject("_links").getJSONObject("self");
         String href = hrefJson.getString("href");
         ...

【讨论】：