使用GSON解析JSON到POJO

My JSON looks like follow :

我的JSON看起来如下:

"message_defaults": {
      "LabResultsRequestDefaultMessage": {
        "MsgTypeId": 8,
        "StaffId": 122,
        "StaffName": "Willis,Sam",
        "FirstName": "Sam",
        "MI": "D",
        "LastName": "Willis",
        "DefaultMessage": "Lab Department"
      },
      "ReferralRequestDefaultMessage": {
        "MsgTypeId": 6,
        "StaffId": 122,
        "StaffName": "Willis,Sam",
        "FirstName": "Sam",
        "MI": "D",
        "LastName": "Willis",
        "DefaultMessage": "Physican"
      },
      "MessageComposeDefaultMessage": {
        "MsgTypeId": 1,
        "StaffId": 122,
        "StaffName": "Willis,Sam",
        "FirstName": "Sam",
        "MI": "D",
        "LastName": "Willis",
        "DefaultMessage": "Office Manager/Willis Sam"
      }
}

Now each elemet in message_defaluts is having same structure (Say one POJO called MessageDefault.java). So how can I get all message defaults as a List<MessageDefault> ??

现在message_defaluts中的每个元素都具有相同的结构(比如一个名为MessageDefault.java的POJO)。那么，如何将所有消息默认设置为列表 ?

I am using gson for parsing. Also I can't change JSON response.

我正在使用gson进行解析。我也不能改变JSON响应。

EDIT ::

编辑::

MessageDefault.java

public class MessageDefault{
    private String defaultMessage;
    private String firstName;
    private String lastName;
    private String mI;
    private int msgTypeId;
    private int staffId;
    private String staffName;

    public String getDefaultMessage(){
        return this.defaultMessage;
    }
    public void setDefaultMessage(String defaultMessage){
        this.defaultMessage = defaultMessage;
    }
    public String getFirstName(){
        return this.firstName;
    }
    public void setFirstName(String firstName){
        this.firstName = firstName;
    }
    public String getLastName(){
        return this.lastName;
    }
    public void setLastName(String lastName){
        this.lastName = lastName;
    }
    public String getMI(){
        return this.mI;
    }
    public void setMI(String mI){
        this.mI = mI;
    }
    public int getMsgTypeId(){
        return this.msgTypeId;
    }
    public void setMsgTypeId(int msgTypeId){
        this.msgTypeId = msgTypeId;
    }
    public int getStaffId(){
        return this.staffId;
    }
    public void setStaffId(int staffId){
        this.staffId = staffId;
    }
    public String getStaffName(){
        return this.staffName;
    }
    public void setStaffName(String staffName){
        this.staffName = staffName;
    }
}

Its is just structure of all message_defualts . But In JSON, each child of message_defualts is having different name like LabResultsRequestDefaultMessage, ReferralRequestDefaultMessage etc which are being reflected in POJO MessageDefault.java. But from JSON I want List of them.

它只是所有message_defualts的结构。但是在JSON中，message_defualts的每个子节点都有不同的名称，比如LabResultsRequestDefaultMessage、ReferralRequestDefaultMessage等等，这些名称在POJO MessageDefault.java中反映出来。但从JSON中，我需要它们的列表。

Thanks.

谢谢。

2 个解决方案

#1

You can do the following without changing your json structure.

您可以在不改变json结构的情况下执行以下操作。

Type mapType = new TypeToken<Map<String, MessageDefault>>() {}.getType();
Map<String, MessageDefault> messagesMap = gson.fromJson(json, mapType);
List<MessageDefault> messages = new ArrayList<MessageDefault>(messagesMap.values());

#2

If you want to get List from json first you have to correct your json. List must be in '[ ]'.

如果您想首先从json中获取列表，您必须纠正您的json。列表必须在“[]”中。

"message_defaults": [{
      "LabResultsRequestDefaultMessage": {
        "MsgTypeId": 8,
        "StaffId": 122,
        "StaffName": "Willis,Sam",
        "FirstName": "Sam",
        "MI": "D",
        "LastName": "Willis",
        "DefaultMessage": "Lab Department"
      },
      "ReferralRequestDefaultMessage": {
        "MsgTypeId": 6,
        "StaffId": 122,
        "StaffName": "Willis,Sam",
        "FirstName": "Sam",
        "MI": "D",
        "LastName": "Willis",
        "DefaultMessage": "Physican"
      },
      "MessageComposeDefaultMessage": {
        "MsgTypeId": 1,
        "StaffId": 122,
        "StaffName": "Willis,Sam",
        "FirstName": "Sam",
        "MI": "D",
        "LastName": "Willis",
        "DefaultMessage": "Office Manager/Willis Sam"
      }
}]

EDIT : try this for converting to list

编辑:试试这个转换为列表。

Type collectionType = new TypeToken<Collection<Integer>>(){}.getType();
Collection<Integer> ints2 = gson.fromJson(json, collectionType);

Follow this link

按照这个链接

#1