Разбор JSON с Argo

Question

Я пытаюсь проанализировать данные с http://api.randomuser.me/ и включить его в свое приложение Java. Данные в формате JSON выглядит следующим образом:

{"results":[{"user":{"gender":"female","name":{"title":"mrs","first":"riley","last":"barnes"},"location":{"street":"6900 washington ave","city":"lousville","state":"new jersey","zip":"82561"},"email":"riley.barnes83@example.com","username":"bluebear21","password":"michaela","salt":"#nH{uwT4","md5":"854a2e76639bc59a8bc08f8f1ceadeb0","sha1":"c84ec59a9137685aec1909e16642e75aecc3221e","sha256":"4dd09f1e230d7a98ebfe2c14588fedc6d6f436eecc72952dd4565d8e51823ac4","registered":"968313341","dob":"316929409","phone":"(288)-381-2384","cell":"(804)-975-5466","SSN":"546-48-9490","picture":"http://api.randomuser.me/0.3/portraits/women/17.jpg"},"seed":"6a35aafac76ff6f","version":"0.3"}]} 

Я использую http://argo.sourceforge.net/ для анализа данных, но я постоянно получаю эту ошибку при попытке.

Exception in thread "main" argo.jdom.JsonNodeDoesNotMatchPathElementsException: Failed to find a field called ["user"] at ["user"] while resolving ["user"] in [{"results":[{"user":{"gender":"female","name":{"title":"miss","first":"hannah","last":"parker"},"location":{"street":"4708 daisy dr","city":"waxahachie","state":"new hampshire","zip":"32151"},"email":"hannah.parker73@example.com","username":"blackswan57","password":"ellie","salt":"4IkJxhN2","md5":"40ccea4f5670f63af4c3ba26f749d735","sha1":"f9ac6e78079ff34f8bd018884bf658ac2c39d8c3","sha256":"b04fb6337fc7e5e26b096ddd3895a8e6500783fbe026f2cd92febd427df9b505","registered":"1140098652","dob":"492991640","phone":"(847)-802-9539","cell":"(816)-467-2525","SSN":"756-30-7542","picture":"http://api.randomuser.me/0.3/portraits/women/26.jpg"},"seed":"baffebbfa57c353","version":"0.3"}]}]. 
at argo.jdom.JsonNodeDoesNotMatchPathElementsException.jsonNodeDoesNotMatchPathElementsException(JsonNodeDoesNotMatchPathElementsException.java:23) 
at argo.jdom.JsonNode.wrapExceptionsFor(JsonNode.java:359) 
at argo.jdom.JsonNode.getStringValue(JsonNode.java:184) 
at twitter.ciangallagher.net.RandomUserGenerator.genUser(RandomUserGenerator.java:55) 
at twitter.ciangallagher.net.Browser.main(Browser.java:646) 

Код я написал следующим образом:

class RandomUserGenerator { 
    public String text; 

    public void genUser() throws ClientProtocolException, IOException, ParseException, InvalidSyntaxException{ 
     HttpClient client = HttpClientBuilder.create().build(); 
     HttpGet getRequest = new HttpGet("http://api.randomuser.me/"); 
     getRequest.addHeader("accept", "application/json"); 

     HttpResponse response = client.execute(getRequest); 

     if (response.getStatusLine().getStatusCode() != 200) { 
      throw new RuntimeException("Failed : HTTP error code : " 
       + response.getStatusLine().getStatusCode()); 
     } 

     BufferedReader br = new BufferedReader(
         new InputStreamReader((response.getEntity().getContent()))); 

     String output; // API output 

     System.out.println("Output from Server .... \n"); 
     while ((output = br.readLine()) != null) { 
      System.out.println(output); 
      text = output; 
     } 

     System.out.println(text); 
     String secondSingle = new JdomParser().parse(text).getStringValue("user"); 

    } 
} 

Answer 1

Это наихудший библиотека документации я когда-либо видел в 10 лет.

Есть намного более совершенные библиотеки для разбора JSON, такие как GSON, flexjson, jackson и т. Д. (Я сам, как flexjson).

Но если вы хотите, чтобы идти вперед с этим, позвольте мне показать вам пример того, как вы можете получить некоторую ценность

public static void main(String[] args) throws IOException, InvalidSyntaxException { 

    StringBuffer text = new StringBuffer(); 
    BufferedReader br = new BufferedReader(new InputStreamReader(JSON.class.getResourceAsStream("json.txt"))); 

    String output; // API output 

    System.out.println("Output from Server .... \n"); 
    while ((output = br.readLine()) != null) { 
     System.out.println(output); 
     text.append(output); 
    } 

    System.out.println(text); 
    JsonRootNode rootNode = new JdomParser().parse(text.toString()); 
    List<JsonNode> results = rootNode.getArrayNode("results"); 
    JsonNode firstUserMap = results.get(0); 
    JsonField user = firstUserMap.getFieldList().get(0); 
    JsonNode userNode = user.getValue(); 
    JsonField name = userNode.getFieldList().get(1); 
    JsonNode nameNode = name.getValue(); 
    JsonField firstName = nameNode.getFieldList().get(1); 
    System.out.println(firstName.getValue().getText()); 

} 

отпечатки

riley 

пс. фрагмент JSON

{ 
    "results":[ 
     { 
     "user":{ 
      "gender":"female", 
      "name":{ 
       "title":"mrs", 
       "first":"riley", 
       "last":"barnes" 
      }, 
    (...)