找不到适用于响应类型的HttpMessageConverter - 自定义RestTemplate

首先，抱歉可能有重复。我发现了一些有关类似问题的问题。但是，我仍然无法弄清楚我的具体情况有什么问题。找不到适用于响应类型的HttpMessageConverter - 自定义RestTemplate

所以，从服务器例如JSON：

[ 
    { 
    "_id": "55f9690f30ef6f210e2dc3a5", 
    "ID": "74c4bf82-9f78-4df5-b9d7-6547e2a55eaa", 
    "Name": "myLand, Saarbrücken", 
    "__v": 0, 
    "Shops": [ 
     { 
     "ID": "b8eacee1-b2c6-48aa-ac6f-2e7fbe3a5d68", 
     "Name": "ARA", 
     "_id": "55f9690f30ef6f210e2dc3a6", 
     "News": [ 
      { 
      "ID": "d79b7f51-7d5c-4bd6-9321-e40c6e93788c", 
      "ValidFrom": "2015-01-08T00:00:00", 
      "ValidTo": "2015-09-30T00:00:00", 
      "_id": "55f9690f30ef6f210e2dc3a7", 
      "Texts": [ 
       { 
       "ID": "TITLE", 
       "Value": "11. Wochenspiegel Firmenlauf", 
       "_id": "55f9690f30ef6f210e2dc3a9" 
       }, 
       { 
       "ID": "BODY", 
       "Value": "Wir gratulieren zur ersten und gleich sehr erfolgreichen Teilnahme am 11.Wochenspiegel Firmenlauf in Dillingen,\r\nunsere Teams vom “Outlet center Wadgassen“ haben ihren Lauf mit tollen Zeiten abgeschlossen und hatten trotz\r\nhohen Temperaturen einen wunderbaren Tag – wie man sehen kann. Wir freuen uns schon jetzt auf nächstes Jahr!", 
       "_id": "55f9690f30ef6f210e2dc3a8" 
       } 
      ] 
      } 
     ], 
     "Texts": [ 
      { 
      "ID": "DESCRIPTION", 
      "Value": "Mit Tradition in die Zukunft Seit sechs Jahrzehnten steht ara für vielfältige Schuhmode erstklassiger Qualität,", 
      "_id": "55f9690f30ef6f210e2dc3aa" 
      } 
     ] 
     } 
    ] 
    } 
]

我生成的类叫做购物中心（和所有子类数据结构的其余部分）：

public class Mall 
{ 

    private String Id; 
    private String ID; 
    private String Name; 
    private int V; 
    private List<Shop> Shops = new ArrayList<Shop>(); 
    private Map<String, Object> additionalProperties = new HashMap<String, Object>(); 

    /** 
    * @return The Id 
    */ 
    public String getId() 
    { 
     return Id; 
    } 

    /** 
    * @param Id The _id 
    */ 
    public void setId(String Id) 
    { 
     this.Id = Id; 
    } 

    /** 
    * @return The ID 
    */ 
    public String getID() 
    { 
     return ID; 
    } 

    /** 
    * @param ID The ID 
    */ 
    public void setID(String ID) 
    { 
     this.ID = ID; 
    } 

    /** 
    * @return The Name 
    */ 
    public String getName() 
    { 
     return Name; 
    } 

    /** 
    * @param Name The Name 
    */ 
    public void setName(String Name) 
    { 
     this.Name = Name; 
    } 

    /** 
    * @return The V 
    */ 
    public int getV() 
    { 
     return V; 
    } 

    /** 
    * @param V The __v 
    */ 
    public void setV(int V) 
    { 
     this.V = V; 
    } 

    /** 
    * @return The Shops 
    */ 
    public List<Shop> getShops() 
    { 
     return Shops; 
    } 

    /** 
    * @param Shops The Shops 
    */ 
    public void setShops(List<Shop> Shops) 
    { 
     this.Shops = Shops; 
    } 

    public Map<String, Object> getAdditionalProperties() 
    { 
     return this.additionalProperties; 
    } 

    public void setAdditionalProperty(String name, Object value) 
    { 
     this.additionalProperties.put(name, value); 
    } 

}

Server返回conent型文本/纯。要修改的内容类型，我写了简单的扩展类：

public class RestTemplateJSON extends RestTemplate 
{ 

    @Override 
    protected <T> T doExecute(URI url, HttpMethod method, RequestCallback requestCallback, 
           ResponseExtractor<T> responseExtractor) throws RestClientException 
    { 

     //logger.info(RestTemplateJSON.class.getSuperclass().getSimpleName() + ".doExecute() is overridden"); 

     Assert.notNull(url, "'url' must not be null"); 
     Assert.notNull(method, "'method' must not be null"); 
     ClientHttpResponse response = null; 
     try 
     { 
      ClientHttpRequest request = createRequest(url, method); 
      if (requestCallback != null) 
      { 
       requestCallback.doWithRequest(request); 
      } 
      response = request.execute(); 

      // Set ContentType to JSON 
      response.getHeaders().setContentType(MediaType.APPLICATION_JSON); 

      if (!getErrorHandler().hasError(response)) 
      { 
       logResponseStatus(method, url, response); 
      } else 
      { 
       handleResponseError(method, url, response); 
      } 
      if (responseExtractor != null) 
      { 
       return responseExtractor.extractData(response); 
      } else 
      { 
       return null; 
      } 
     } 
     catch (IOException ex) 
     { 
      throw new ResourceAccessException("I/O error on " + method.name() + 
        " request for \"" + url + "\":" + ex.getMessage(), ex); 
     } 
     finally 
     { 
      if (response != null) 
      { 
       response.close(); 
      } 
     } 

    } 

    private void logResponseStatus(HttpMethod method, URI url, ClientHttpResponse response) 
    { 
     //if (logger.isDebugEnabled()) 
     { 
      try 
      { 
       System.out.println(method.name() + " request for \"" + url + "\" resulted in " + 
         response.getRawStatusCode() + " (" + response.getStatusText() + ")"); 
      } 
      catch (IOException e) 
      { 
       // ignore 
      } 
     } 
    } 

    private void handleResponseError(HttpMethod method, URI url, ClientHttpResponse response) throws IOException 
    { 
     getErrorHandler().handleError(response); 
    } 
}

最后，这就是我正在努力消耗我的web服务：

RestTemplateJSON restTemplate = new RestTemplateJSON(); 
restTemplate.getMessageConverters().add(new MappingJackson2HttpMessageConverter()); 
Mall mall = restTemplate.getForObject(url, Mall.class);

不过，我仍然得到同样的异常：

无法提取响应：没有合适HttpMessageConverter找到响应类型[mmrestspringtest.Mall.Mall]和内容类型 [应用/ JSON]

据我所知，如果我改变内容类型，应该没问题。你能告诉我我做错了什么吗？

来源

2015-09-16 user1209216

所以，我终于明白了。 json中有数组，所以我想将它映射到Mall []，而不是Mall。我提供了错误的类，应该是：

RestTemplateJSON restTemplate = new RestTemplateJSON(); 
restTemplate.getMessageConverters().add(new MappingJackson2HttpMessageConverter()); 
Mall[] malls = restTemplate.getForObject(url, Mall[].class);

来源

2015-09-16 21:49:14 user1209216

找不到适用于响应类型的HttpMessageConverter - 自定义RestTemplate

回答

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