如何通過POST方法使用Google的freebase？

我無法在我的java代碼中使用Google的freebase API。看起來，我的查詢太大，無法通過GET方法發送，但我無法找到將其作爲POST發送的方式。如何通過POST方法使用Google的freebase？

這是我得到的錯誤：

com.google.api.client.googleapis.json.GoogleJsonResponseException: 414 Request-URI Too Large 
<!DOCTYPE html> 
<html lang=en> 
    <meta charset=utf-8> 
    <meta name=viewport content="initial-scale=1, minimum-scale=1, width=device-width"> 
    <title>Error 414 (Request-URI Too Large)!!1</title> 
    <style> 
    *{margin:0;padding:0}html,code{font:15px/22px arial,sans-serif}html{background:#fff;color:#222;padding:15px}body{margin:7% auto 0;max-width:390px;min-height:180px;padding:30px 0 15px}* > body{background:url(//www.google.com/images/errors/robot.png) 100% 5px no-repeat;padding-right:205px}p{margin:11px 0 22px;overflow:hidden}ins{color:#777;text-decoration:none}a img{border:0}@media screen and (max-width:772px){body{background:none;margin-top:0;max-width:none;padding-right:0}} 
    </style> 
    <a href=//www.google.com/><img src=//www.google.com/images/errors/logo_sm.gif alt=Google></a> 
    <p><b>414.</b> <ins>That’s an error.</ins> 
    <p>The requested URL <code>/freebase/v1/mqlread</code>... is too large to process. <ins>That’s all we know.</ins> 

    at com.google.api.client.googleapis.json.GoogleJsonResponseException.from(GoogleJsonResponseException.java:143) 
    at com.google.api.client.googleapis.json.GoogleJsonResponseException.execute(GoogleJsonResponseException.java:187) 
    at com.google.api.client.googleapis.services.GoogleClient.executeUnparsed(GoogleClient.java:279) 
    at com.google.api.client.http.json.JsonHttpRequest.executeUnparsed(JsonHttpRequest.java:207) 
    at com.huawei.mdf.MQLReadService.doMqlRead(MQLReadService.java:67) 
    at com.huawei.mdf.MQLReadService.main(MQLReadService.java:82)

下面的代碼：

public void doMqlRead(String id, QueryType queryType) { 

    HttpTransport httpTransport = new NetHttpTransport(); 
    JsonFactory jsonFactory = new JacksonFactory(); 
    HttpRequestInitializer httpRequestInitializer = new HttpRequestInitializer() { 
     @Override 
     public void initialize(HttpRequest arg0) throws IOException { 
      // TODO Auto-generated method stub 

     } 
    }; 

    JsonHttpRequestInitializer requestInitializer = new JsonHttpRequestInitializer() { 
     public void initialize(JsonHttpRequest jsonHttpRequest) 
       throws IOException { 
      FreebaseRequest freebaseRequest = (FreebaseRequest) jsonHttpRequest; 
      freebaseRequest.setPrettyPrint(true); 
      freebaseRequest.setKey(API_KEY); 
     } 
    }; 

    Freebase.Builder fbb = new Freebase.Builder(httpTransport, jsonFactory, 
      httpRequestInitializer); 

    Freebase freebase = fbb.setJsonHttpRequestInitializer(
      requestInitializer).build(); 

    List<String> queryList = QueryUtil.getQuery(queryType); 
    for (String query : queryList) { 
     query = query.replace("idreplace", id); 
     System.out.println(query.length()); 

     try { 
      Mqlread mqlread = freebase.mqlread(query); 
      mqlread.setIndent(indentation); 

      HttpResponse executeUnparsed = mqlread.executeUnparsed(); 
      String parseAsString = executeUnparsed.parseAsString(); 
      System.out.println(parseAsString); 

     } catch (Exception e) { 
      e.printStackTrace(); 
     } 
    } 
}

我也試圖改變這一部分中的遊離鹼類（行450）通過切換HttpMethod.GET部分轉換爲HttpMethod.POST，但我確定它不是正確的方式：

/** 
    * Internal constructor. Use the convenience method instead. 
    */ 
    Mqlread(String query) { 
     super(Freebase.this, HttpMethod.GET, REST_PATH, null); 
     this.query = Preconditions.checkNotNull(query, 
       "Required parameter query must be specified."); 
    }

有沒有辦法做到這一點？

來源

2012-11-05 m.usta

似乎沒有辦法從Google API客戶端庫中覆蓋API調用的HTTP方法。你必須建立Request對象自己是這樣的：

HttpTransport httpTransport = new NetHttpTransport(); 
HttpRequestFactory httpRequestFactory = httpTransport.createRequestFactory(); 

String data = "query=" + query; 
HttpContent content = new ByteArrayContent("application/x-www-form-urlencoded", data.getBytes()); 
GenericUrl url = new GenericUrl("https://www.googleapis.com/freebase/v1/mqlread"); 

HttpRequest request = httpRequestFactory.buildPostRequest(url, content); 
HttpHeaders headers = new HttpHeaders(); 
headers.put("X-HTTP-Method-Override","GET"); 
request.setHeaders(headers); 

HttpResponse response = request.execute();

請注意，我已經設置了X-HTTP-方法-Override標題，使這一請求被作爲服務器端的GET請求來處理。

我已經提交了a bug供客戶端庫自動處理。

來源

2012-11-08 06:53:46

非常感謝肖恩！ –

如何通過POST方法使用Google的freebase？

回答

相關問題