错误

Question

我有一个JAX-RS休息服务。然后我在Netbeans中调用此服务。我使用的是genson-1.0。我这样称呼服务：

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

我的JSON数组

[{"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"}]

错误

线程中的异常＆＃34; main＆＃34; javax.ws.rs.WebApplicationException：HTTP 500内部服务器错误 com.owlike.genson.ext.jaxrs.GensonJsonConverter.readFrom（GensonJsonConverter.java:127）在 org.glassfish.jersey.message.internal.ReaderInterceptorExecutor $ TerminalReaderInterceptor.aroundReadFrom（ReaderInterceptorExecutor.java:188）在 org.glassfish.jersey.message.internal.ReaderInterceptorExecutor.proceed（ReaderInterceptorExecutor.java:134）在 org.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）在 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）在org.glassfish.jersey.internal.Errors.process（Errors.java:315）at org.glassfish.jersey.internal.Errors.process（Errors.java:297）at org.glassfish.jersey.internal.Errors.process（Errors.java:228）at 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.AppointmentRRSClient.allAppointments（AppointmentRRSClient.java:39）在 mPackage.AppointmentRRSClientTest.main（AppointmentRRSClientTest.java:25）引起：com.owlike.genson.JsonBindingException：不能反序列化以输入类myPackage.Appointment at com.owlike.genson.Genson.deserialize（Genson.java：391）at com.owlike.genson.ext.jaxrs.GensonJsonConverter.readFrom（GensonJsonConverter.java:125） ... 18更多引起：com.owlike.genson.stream.JsonStreamException：预期第0行和第0列的非法字符{但请阅读＆＃39; [＆＃39; ！在 com.owlike.genson.stream.JsonReader.newWrongTokenException（JsonReader.java:949）在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（BeanDescriptor.java: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更多 Java结果：1建立成功（总时间：1秒）

我的JSON格式是否错误？

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

当我获取单个数据时，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"}

提前致谢！

修改

AppointmentRRSClient有这个方法来获取json数据并将其解析为Appointments类型的对象列表。

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);
    }

解决方案

我使用了Gson。现在我这样称呼服务。

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());

Answer 1

您的json包含一个apointments数组，但您要反序列化为约会对象。带子串的解决方案可能适用于这种情况，但它不干净也不稳定（如果要反序列化具有多个元素的列表会发生什么 - 你得到第一个......），你不应该这样做这样做。

干净的解决方案是更改方法签名：

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);
}

然后你这样称呼它：

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

备注 GenericType不是来自Genson但来自泽西岛的那个：javax.ws.rs.core.GenericType

Answer 2

如错误所示，预计会{，但会找到[。

如果JSON尚未转换为字符串，则转换为myJson.substring(1, myJson.length() -1)并尝试再次解析它，它应该可以正常工作。

Json数组到对象列表

错误

2 个答案: