我有一個JAX-RS Rest服務。然後我在Netbeans中調用這個服務。我正在使用genson-1.0。我所說的服務是這樣的：將Json數組添加到對象列表中

ArrayList<Appointment> appointments; 
    AppointmentRRSClient client = new AppointmentRRSClient();   
    Object response = client.allAppointments(Appointment.class);

我JSON陣列

[{"id":1,"date":"2014-09-19","patient_id":1,"patient_name":"Lorenzana, Jerome Keith G.","patient_mobile":"+639178374407","staff_id":1,"staff_name":"Tugado, John Ephraim G.","location":"Makati Health Center","type":"walk-in","remarks":"okay lang"},{"id":2,"date":"2014-09-19","patient_id":2,"patient_name":"Black, Gucci G.","patient_mobile":"+639178488120","staff_id":1,"staff_name":"Tugado, John Ephraim G.","location":"Makati Health Center","type":"walk-in","remarks":"okay lang"},{"id":3,"date":"2014-09-19","patient_id":3,"patient_name":"Sagucio, Matthew V.","patient_mobile":"+6391068753242","staff_id":1,"staff_name":"Tugado, John Ephraim G.","location":"Makati Health Center","type":"walk-in","remarks":"okay lang"},{"id":4,"date":"2014-09-19","patient_id":4,"patient_name":"Lizardo, Daniel Z.","patient_mobile":"+639175606349","staff_id":1,"staff_name":"Tugado, John Ephraim G.","location":"Makati Health Center","type":"walk-in","remarks":"okay lang"},{"id":5,"date":"2014-09-19","patient_id":5,"patient_name":"Abulencia, Chester X.","patient_mobile":"+639051200480","staff_id":1,"staff_name":"Tugado, John Ephraim G.","location":"Makati Health Center","type":"walk-in","remarks":"okay lang"}]

錯誤

異常線程「main」 javax.ws.rs.WebApplicationException：HTTP 500內部服務器錯誤在 com.owlike.genson.ext.jaxrs.GensonJsonConverter.readFrom（GensonJsonConverter.java:127） at org.glassfish.jersey.message.internal.ReaderInterceptorExecutor $ TerminalReaderInterceptor.aroundReadFrom（ReaderInterceptorExecutor.java:188）在 org.glassfish.jersey.message.internal.ReaderInterceptorExecutor.proceed（ReaderInterceptorExecutor.java:134）在組織.glassfish.jersey.message.internal.MessageBodyFactory.readFrom（MessageBodyFactory.java:988）在 org.glassfish.jersey.message.internal.InboundMessageContext.readEntity（InboundMessageContext.java:833）在 org.glassfish.jersey .message.internal.InboundMessageContext.readEntity（InboundMessageContext.java:768） at org.glassfish.jersey.client.InboundJaxrsResponse.readEntity（InboundJaxrsResponse.java:96）在 org.glassfish.jersey.client.JerseyInvocation.translate（JerseyInvocation.java:740）在 org.glassfish.jersey.client.JerseyInvocation.access 500 $（JerseyInvocation.java:88）在 org.glassfish。 jersey.client.JerseyInvocation $ 2.call（JerseyInvocation.java:650） at org.glassfish.jersey.internal.Errors.process（Errors.java:315）at org.glassfish.jersey.internal.Errors.process（Errors的.java：297）在 org.glassfish.jersey.internal.Errors.process（Errors.java:228）在 org.glassfish.jersey.process.internal.RequestScope.runInScope（RequestScope.java:421）在 org.glassfish.jersey.client.JerseyInvocation.invoke（JerseyInvocation.java:646）在 org.glassfish.jersey.client.JerseyInvocation $ Builder.method（JerseyInvocation.java:375）在 org.glassfish.jersey.client.JerseyInvocation $ Builder.get（JerseyInvocation.java:275）在 mypackage的.AppointmentRRSClient.allAppointments（AppointmentRRSClient.java:39）在 mPackage.AppointmentRRSClientTest.main（AppointmentRRSClientTest.java:25）引起：com.owlike.genson.JsonBindingException：無法反序列化到在鍵入類myPackage.Appointment com.owlike.genson.Genson.deserialize（Genson.java:391）at com.owlike.genson.ext.jaxrs.GensonJsonConverter.readFrom（GensonJsonConverter.java:125） ... 18更多原因：com.owlike.genson.stream.JsonStreamException：非法字符在行0和列0期望{但讀'['！在 com.owlike.genson.stream.JsonReader.newWrongTokenException（JsonReader.java:949） at com.owlike.genson.stream.JsonReader.begin（JsonReader.java:425）at com.owlike.genson.stream。 JsonReader.beginObject（JsonReader.java:157）在 com.owlike.genson.reflect.BeanDescriptor._deserWithCtrArgs（BeanDescriptor.java:120）在 com.owlike.genson.reflect.BeanDescriptor.deserialize（的BeanDescriptor。Java的：95）在 com.owlike.genson.convert.BeanViewConverter.deserialize（BeanViewConverter.java:102）在 com.owlike.genson.convert.NullConverter $ NullConverterWrapper.deserialize（NullConverter.java:56）在com.owlike.genson.Genson.deserialize（Genson.java:389）... 19多個 Java結果：1 BUILD SUCCESSFUL（總時間：1秒）

是我在一個壞的格式JSON？

Illegal character at row 0 and column 0 expected { but read '['

當我提取單個數據的東西時，工作正常。

{"username":null,"password":null,"staff_id":1,"staff_name":"Tugado, John Ephraim G.","staff_gender":"male","staff_position_id":1,"health_center_id":1,"health_center_name":"Makati Health Center","account_type":"administrator","account_id":1,"staff_position":"Doctor"}

在此先感謝！

編輯：

的AppointmentRRSClient有這個方法來獲取JSON數據並解析其類型約會的對象的列表。

public <T> T allAppointments(Class<T> responseType) throws ClientErrorException { 
     WebTarget resource = webTarget; 
     resource = resource.path("allAppointments"); 
     return resource.request(javax.ws.rs.core.MediaType.APPLICATION_JSON).get(responseType); 
    }

解決方案

我以前Gson。現在我打電話給這樣的服務。

List<String> names = new ArrayList<String>(); 

     URL url = new URL("http://my-url.com/rest/name"); 
     HttpURLConnection conn = (HttpURLConnection) url.openConnection(); 
     conn.setRequestMethod("GET"); 
     conn.setRequestProperty("Accept", "application/json"); 

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

     BufferedReader br = new BufferedReader(new InputStreamReader(
      (conn.getInputStream()))); 
       String response = ""; 
     String output; 
     while ((output = br.readLine()) != null) { 
      response += output; 
     } 
       conn.disconnect(); 
       // System.out.println(response); 
     Gson gson = new Gson(); 
       TypeToken<List<String>> token = new TypeToken<List<String>>(){}; 
       names = gson.fromJson(response, token.getType());

來源

2014-09-20 John Ephraim Tugado

-1

由於錯誤說，一個{預期，但[被發現。

將您的JSON轉換爲字符串，如果它尚未，然後myJson.substring(1, myJson.length() -1)並嘗試再次解析它，它應該工作。

來源

2014-09-20 12:30:15

我編輯我的帖子，以便您可以看到它如何從我的休息服務中獲取json。我不知道如何將json轉換爲字符串。有任何想法嗎？ – 2014-09-20 14:58:13

我設法解決我使用gson的問題，因爲它接受我的休息服務中的json格式。 – 2014-09-20 16:31:41

@JohnEphraimTugado你的聲明聽起來很奇怪，默認情況下沒有json lib會接受反序列化一個數組到一個對象。有些提供了接受它的選項，但是gson沒有。我沒有看到它如何與Gson（或其他庫）一起工作，而不需要對代碼進行任何更改。 – eugen 2014-09-21 11:18:34

你的json包含一個apoint的數組，但是你正在反序列化到一個約會對象。子字符串的解決方案可能適用於這種情況，但它不是乾淨而且不穩定的（如果你想反序列化一個擁有多個元素的列表 - 如果你得到第一個元素，會發生什麼......），你不應該這樣做這條路。

清潔的解決辦法是方法簽名的更改：

public <T> T allAppointments(Class<T> responseType)

到

public <T> T allAppointments(GenericType<T> responseType) { 
    WebTarget resource = webTarget; 
    resource = resource.path("allAppointments"); 
    return resource.request(javax.ws.rs.core.MediaType.APPLICATION_JSON).get(responseType); 
}

然後調用這樣說：

AppointmentRRSClient client = new AppointmentRRSClient();   
List<Appointment> response = client.allAppointments(new GenericType<List<Appointment>>(){});

備註 GenericType不是來自Genson，而是來自Jersey：javax.ws.rs.co re.GenericType

來源

2014-09-21 11:11:30 eugen

我發佈了我找到的解決方案。我真的不明白。我現在在做java 2個月，比.NET更困難 – 2014-09-23 06:29:19

將Json數組添加到對象列表中

錯誤

回答

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