Question

我想使用Gson库在JSON中获取JSON对象数组，但是我在如何获取嵌套JSON数组中的特定JSON数组时遇到了问题。这就是我的尝试：

我的模特课程：

public class ComposeSMSList {

@SerializedName("userMessages")
@Expose
private List<UserMessage> userMessages = null;
@SerializedName("userPhoneBooks")
@Expose
private List<UserPhoneBook> userPhoneBooks = null;
@SerializedName("usersSendorIds")
@Expose
private List<UsersSendorId> usersSendorIds = null;
@SerializedName("userTemplates")
@Expose
private List<UserTemplate> userTemplates = null;

public List<UserMessage> getUserMessages() {
    return userMessages;
}

public void setUserMessages(List<UserMessage> userMessages) {
    this.userMessages = userMessages;
}

public List<UserPhoneBook> getUserPhoneBooks() {
    return userPhoneBooks;
}

public void setUserPhoneBooks(List<UserPhoneBook> userPhoneBooks) {
    this.userPhoneBooks = userPhoneBooks;
}

public List<UsersSendorId> getUsersSendorIds() {
    return usersSendorIds;
}

public void setUsersSendorIds(List<UsersSendorId> usersSendorIds) {
    this.usersSendorIds = usersSendorIds;
}

public List<UserTemplate> getUserTemplates() {
    return userTemplates;
}

public void setUserTemplates(List<UserTemplate> userTemplates) {
    this.userTemplates = userTemplates;
}

}

现在我想从父类访问用户电话簿课程有没有优雅的方法来做到这一点？

我的代码：

Gson mGson=new Gson();
List<ComposeModel> posts=Arrays.asList(mGson.fromJson(response.toString(),ComposeModel.class));

for (int i=0;i<posts.size();i++){
    ComposeModel object = new  ComposeModel(posts.get(i).getComposeSMSList().getUserMessages().get(i).getId(),posts.get(i).getComposeSMSList().getUserMessages().get(i).getMessage());
    global.add(object);
}
mUserMsgAdpater=new UserMsgAdpater(mContext,global);
mRecyclerView.setAdapter(mUserMsgAdpater);

Answer 1

您的ComposeModel类是什么？无论如何，您在评论中插入的Json是不完整的。我认为是这样的：

<强> ComposeSMS.json

{
  "userMessages":[
    {
      "id":1,
      "message":"this is a message"
    }
  ],
  "userPhoneBooks":[
    {
      "id":1,
      "phonebookGroupname":"ISKON",
      "nrOfContacts":2924
    }
  ],
  "usersSendorIds":[
    {
      "id":1
    }
  ],
  "userTemplates":[
    {
      "id":1,
      "templateName":"aTemplate"
    }
  ]
}

如果你有 ComposeSMSList 类：

    public class ComposeSMSList {

    private List<UserMessage> userMessages = null;
    private List<UserPhoneBook> userPhoneBooks = null;
    private List<UsersSendorId> usersSendorIds = null;
    private List<UserTemplate> userTemplates = null;

    public List<UserMessage> getUserMessages() {
        return userMessages;
    }

    public void setUserMessages(List<UserMessage> userMessages) {
        this.userMessages = userMessages;
    }

    public List<UserPhoneBook> getUserPhoneBooks() {
        return userPhoneBooks;
    }

    public void setUserPhoneBooks(List<UserPhoneBook> userPhoneBooks) {
        this.userPhoneBooks = userPhoneBooks;
    }

    public List<UsersSendorId> getUsersSendorIds() {
        return usersSendorIds;
    }

    public void setUsersSendorIds(List<UsersSendorId> usersSendorIds) {
        this.usersSendorIds = usersSendorIds;
    }

    public List<UserTemplate> getUserTemplates() {
        return userTemplates;
    }

    public void setUserTemplates(List<UserTemplate> userTemplates) {
        this.userTemplates = userTemplates;
    }
}

您可以通过以下方式反序列化您的json：

        Gson gson = new Gson();
        String filename="/pathTo.../composeSMS.json";
        JsonReader reader = new JsonReader(new FileReader(filename));
        ComposeSMSList composeSMSList= gson.fromJson(reader, ComposeSMSList.class);
        System.out.println("composeSMSList: " + gson.toJson(composeSMSList));

在您的问题中，您要求访问UserPhoneBook，但在您的代码中，您尝试使用UserMessage。

无论如何，你可以这样访问：

       List<UserPhoneBook> userPhoneBooks= composeSMSList.getUserPhoneBooks();
       for(UserPhoneBook upb: userPhoneBooks)
        {
            System.out.println("UserPhoneBook id: " + upb.getId());
            System.out.println("UserPhoneBook nrOfContacts: " +upb.getNrOfContacts());
            System.out.println("UserPhoneBook phonebookGroupname: " +upb.getPhonebookGroupname());
        }

如何使用gson解析特定的对象数组？

1 个答案: