[英]How to parse a particular array of object using gson?
我想使用Gson库在JSON中获取对象的JSON数组,但是在这里我有一个关于如何访问嵌套JSON数组中的特定JSON数组的问题。 这就是我正在尝试的方法:
我的模特班:
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类。
有什么优雅的方法可以做到这一点吗?
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);
您的ComposeModel类是什么? 无论如何,您插入评论中的Json是不完整的。 我以为是这样的:
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"
}
]
}
如果您有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,但是在您的代码中,请尝试使用UserMessage。
无论如何,您可以通过以下方式访问:
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());
}
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