如何使用GSON解析嵌套的JSON [英] How to parse nested JSON using GSON

问题描述

我目前正在使用抽象获取请求，并在onResponse我想解析使用Gson jsonObject到我的模型。

JSON在请求发出后返回：

  {
success：1，
message：完成，
data：{
company：companyname，
email：电子邮件，
color：#ffffff，
text_color：＃000000，
background_image：BITMAP ENCODED，
logo： BITMAP ENCODED，
enable_health_and_safety：0，
health_and_safety：，
sign_in_button_text：登录，
sign_out_button_text：SIGN OUT ，
enable_picture：0，
package_type：TRIAL，
created_at：2017-03-06 12:21:23，
 updated_at：2017-03-06 12:21:23，
telephone：，
auto_sign_out：0，
sign_out_time：，
enable_printing：0 
} 
} 
  

我的模型

  public class ClientResponseModel实现Serializable {
 private字符串成功; 
私人字符串消息; 
 private ClientData clientData; 
 
 public String getSuccess（）{
 return success; 
} 
 
 public void setSuccess（String success）{
 this.success = success; 
} 
 
 public String getMessage（）{
 return message; 
} 
 
 public void setMessage（String message）{
 this.message = message; 
} 
 
 public ClientData getClientData（）{
 return clientData; 
} 
 
 public void setClientData（ClientData clientData）{
 this.clientData = clientData; 
} 
 
公共类ClientData实现Serializable {
私有字符串公司; 
私人字符串电子邮件; 
 private String client_color; 
 private String text_color; 
私人字符串background_image; 
私有字符串标识; 
 private int enable_health_and_safety; 
 private String health_and_safety; 
私人字符串sign_in_button_text; 
私人字符串sign_out_button_text; 
 private int enable_picture; 
 private String package_type; 
 private String created_at; 
私人字符串updated_at; 
私人弦乐电话; 
 private int auto_sign_out; 
私人字符串sign_out_time; 
 private int enable_printing; 
 
 //在
之上的所有获取者和设置者
 $ / code> 

My onResponse函数



  final JsonObjectRequest getClientData = new JsonObjectRequest（Request.Method.GET，clientUrl，null，new Response.Listener< JSONObject>（）{
 @Override 
 public void onResponse（JSONObject response）{
 Log.i（getUserDataOnResponse，response.toString（））; 
 Gson gson = new Gson（）; 
 ClientResponseModel clientResponseModel = gson.fromJson（response.toString（），ClientResponseModel.class）; 
 
 
 Log.i（sucess，clientResponseModel.getSuccess ））; 
 Log.i（message，clientResponseModel.getMessage（））; 
 Log.i（company，clientResponseModel.getClientData（）。getEmail（））; 
 
} 
  

然而，当我试图从clientData获取数据时，例如获取e邮件。该应用程序崩溃，我收到以下错误消息。



  java.lang.NullPointerException：试图调用虚拟方法'java.lang.String ClientResponseModel $ ClientData.getEmail（）'on一个空对象引用
  

我不确定我可能做错了什么，我曾经看过少数链接例如如何使用gson和volley parse嵌套json a>

感谢您提前提供所有帮助。

您的代码中存在一个小错误。因此，您应该将ClientData clientData更改为ClientData数据。然后你可以得到数据。希望这会帮助你解析。

I am currently making a get request using volley and in onResponse i am trying to parse the jsonObject using gson to my model.

JSON Returned after the request is made:

{
   "success": 1,
   "message": "Done",
   "data": {
             "company": "companyname",
             "email": "email",
             "color": "#ffffff",
             "text_color": "#000000",
             "background_image": "BITMAP ENCODED",
             "logo": "BITMAP ENCODED",
             "enable_health_and_safety": 0,
             "health_and_safety": "",
             "sign_in_button_text": "SIGN IN",
             "sign_out_button_text": "SIGN OUT",
             "enable_picture": 0,
             "package_type": "TRIAL",
             "created_at": "2017-03-06 12:21:23",
             "updated_at": "2017-03-06 12:21:23",
             "telephone": "",
             "auto_sign_out": 0,
             "sign_out_time": "",
             "enable_printing": 0
          }
}

My Model

public class ClientResponseModel implements Serializable {
private String success;
private String message;
private ClientData clientData;

public String getSuccess() {
    return success;
}

public void setSuccess(String success) {
    this.success = success;
}

public String getMessage() {
    return message;
}

public void setMessage(String message) {
    this.message = message;
}

public ClientData getClientData() {
    return clientData;
}

public void setClientData(ClientData clientData) {
    this.clientData = clientData;
}

public class ClientData implements Serializable {
    private String company;
    private String email;
    private String client_color;
    private String text_color;
    private String background_image;
    private String logo;
    private int enable_health_and_safety;
    private String health_and_safety;
    private String sign_in_button_text;
    private String sign_out_button_text;
    private int enable_picture;
    private String package_type;
    private String created_at;
    private String updated_at;
    private String telephone;
    private int auto_sign_out;
    private String sign_out_time;
    private int enable_printing;

    //all the getters and setters for above 
}

My onResponse function

final JsonObjectRequest getClientData = new JsonObjectRequest(Request.Method.GET, clientUrl, null, new Response.Listener<JSONObject>() {
        @Override
        public void onResponse(JSONObject response) {
            Log.i("getUserDataOnResponse", response.toString());
            Gson gson = new Gson();
            ClientResponseModel clientResponseModel = gson.fromJson(response.toString(), ClientResponseModel.class);


            Log.i("sucess",clientResponseModel.getSuccess());
            Log.i("message",clientResponseModel.getMessage());
            Log.i("company",clientResponseModel.getClientData().getEmail());

        }

I can get the success and message however when trying to get the data from clientData, Forexample getting the email. The app crashes and i get a following error message.

java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String ClientResponseModel$ClientData.getEmail()' on a null object reference

I am not sure what i could be doing wrong, i have had looked at few links for example How to use gson and volley parse nested json

Thanks for all the help in advance.

解决方案

There is a little mistake in your code.So you should change ClientData clientData to ClientData data. Then you can get the data.Hope this will help you in parsing.

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