java - 创建复杂的 Json 结构

Question

我的挑战是，我发现将字符串格式化为 json 数据非常困难和棘手，如下所示:

{
    "contacts":[
        {
         "displayName" : "Michael"
       },
       {
         "displayName" : "Efe",
         "phoneNumbers" : [
           {
             "value" : "+23470390989"
           }
         ]
       },
        {
         "displayName" : "Efe6",
         "phoneNumbers" : [
           {
             "value" : "+2347002478"
           }
         ]
       },
          {
         "displayName" : "No Reg",
         "phoneNumbers" : [
           {
             "value" : "+2347034567890"
           }
         ]
       },
       {
         "displayName" : "Efe2",
         "phoneNumbers" : [
           {
             "value" : "09058528818"
           }
         ]
       },

       {
         "displayName" : "Whales",
         "phoneNumbers" : [
           {
             "value" : "+23490574583"
           },
           {
             "value" : "+23481847979"
           }
         ]
       }
       ]
}

我尝试格式化的字符串来自 Getcontact 类(它从手机获取联系人列表)，希望很多人都熟悉从移动设备获取联系人的方法。

已尝试

到目前为止我尝试过的是:

 ArrayList<PhoneNuberStructure> phoneNuberStructures = new ArrayList<>();
                        phoneNuberStructures.add(/*arrays of phonenumbers will come here*/);

并且

ContactsStructure contactsStructure= new ContactsStructure();
                        contactsStructure.setDisplayName(name);
                        contactsStructure.setPhoneNumbers(new PhoneNuberStructure);

所以这个

ArrayList<ContactsStructure> contacts = new ArrayList<ContactsStructure>();
                        contacts.add(contactsStructure);

但我并没有真正理解它!这很令人困惑......

任何帮助都会很好。 谢谢大家。

Answer 1

类似这样的事情

public class Contact {
    private String displayName = null;
    private List<PhoneNumber> phoneNumbers = null;
    public Contact() {}
    public Contact(String displayName, List<PhoneNumber> phoneNumbers) { this.displayName = displayName; this.phoneNumbers = phoneNumbers; }
    public String getDisplayName() { return displayName; }
    public void setDisplayName(String displayName) { this.displayName = displayName; }
    public List<PhoneNumber> getPhoneNumbers() { return phoneNumbers; }
    public void setPhoneNumbers(List<PhoneNumber> phoneNumbers) { this.phoneNUmbers = phoneNumbers; }
}
public class PhoneNumber {
    private String value = null;
    public PhoneNumber() {}
    public PhoneNumber(String value) { this.value = value; }
    public String getValue() { return value; }
    public void setValue(String value) { this.value = value }
}
public Class ContactsTest {
    public static void main(String[] args) {
        List<Contact> contacts = new ArrayList<>();
        Contact contact = new Contact("Michael", null);
        contacts.add(contact);
        List<PhoneNumber> phoneNumbers = new ArrayList<>();
        phoneNumbers.add(new PhoneNumber("+23470390989"));
        contacts.add(new Contact("Efe", phoneNumbers);
        Gson gson = new GsonBuilder().create();
        System.out.println(gson.toJson(contacts));
    }
}