如何通过pojo类从改造响应中检索嵌套在json数组中的json对象

Question

我正在使用登录api，登录成功后会发送复杂的响应。 我在为响应创建的POJO类中实现检索到的数组时遇到问题。 该数组包含两个嵌套对象。

我尝试使用arraylist检索它，但出现错误

public class User{
   String id;
   String name;
   String email;
   String email_verified_at;
   @SerializedName("user_agents")
   private ArrayList<UserAgents> userAgents ;



    public String getId() {
        return id;
    }

    public void setId(String id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getEmail() {
        return email;
    }

    public void setEmail(String email) {
        this.email = email;
    }

    public String getEmail_verified_at() {
        return email_verified_at;
    }

    public void setEmail_verified_at(String email_verified_at) {
        this.email_verified_at = email_verified_at;
    }

UserAgents.java

  public class UserAgents{

  public UserAgents(){
      device = "";
      token_id = "";
    }

    @SerializedName("device")
    String device;

    @SerializedName("token_id")
    String token_id;

    public String getDevice() {
        return device;
    }

    public void setDevice(String device) {
        this.device = device;
    }

    public String getToken_id() {
        return token_id;
    }

    public void setToken_id(String token_id) {
        this.token_id = token_id;
    }
}

预期的JSON格式为：

    "user_agents": "
                    [
                        {"device":"Mozilla/5.0 (Macintosh; Intel Mac OS X x.y; 
                          rv:42.0) Gecko\/20100101 Firefox/42.0",      
"token_id":"ec4eccb011beb3c41f11e83f670ae635117770ac7bc9fb2ac3fbdac3645c16e63e64038d2ad0aa3c"
                        },
                        {"device":"Mozilla\/5.0 (Macintosh; Intel Mac OS X x.y; rv:42.0) Gecko/20100101 Firefox/42.0",
                            "token_id":"8e2bfef45fda2387ede9aa06d71247873db6390f3bf1e5c704cf51e76e3ecbd25cacdfb276464404"
                        }
                    ]"

这是我得到的错误：

java.lang.IllegalStateException：预期为BEGIN_ARRAY，但在第1行第145列的路径$ .success.user.user_agents

Answer 1

由于user_agents包含“”

所以你的user_agents是String

您需要从"user_agents": [ ]删除"" "user_agents": [ ]

{
  "user_agents": [
    {
      "device": "Mozilla/5.0 (Macintosh; Intel Mac OS X x.y; rv:42.0) Gecko/20100101 Firefox/42.0",
      "token_id": "ec4eccb011beb3c41f11e83f670ae635117770ac7bc9fb2ac3fbdac3645c16e63e64038d2ad0aa3c"
    },
    {
      "device": "Mozilla/5.0 (Macintosh; Intel Mac OS X x.y; rv:42.0) Gecko/20100101 Firefox/42.0",
      "token_id": "8e2bfef45fda2387ede9aa06d71247873db6390f3bf1e5c704cf51e76e3ecbd25cacdfb276464404"
    }
  ]
}

Answer 2

您的响应处理不正确，根据错误，Web服务响应是字符串类型，但是您设置了模型类，它是数组类型，

或共享Web服务响应以获得更好的解决方案。

从响应中删除“ user_agents”关键字。

您的网络服务响应必须是这样，

[ {"device":"Mozilla/5.0 (Macintosh; Intel Mac OS X x.y; rv:42.0) Gecko/20100101 Firefox/42.0",
"token_id":"ec4eccb011beb3c41f11e83f670ae635117770ac7bc9fb2ac3fbdac3645c16e63e64038d2ad0aa3c" }, {"device":"Mozilla/5.0 (Macintosh; Intel Mac OS X x.y; rv:42.0) Gecko/20100101 Firefox/42.0", "token_id":"8e2bfef45fda2387ede9aa06d71247873db6390f3bf1e5c704cf51e76e3ecbd25cacdfb276464404" } ]

Answer 3

*这将工作*

    JSONObject JO = new JSONObject(jsonresponse);
    JSONArray JA = (JSONArray) JO.getString("user_agents");
    for (int i = 0; i < JA.length(); i++)
            {
                JSONObject jo = (JSONObject)JA.get(i);
                UserAgents UA = new UserAgents();
                UA.device = jo.getString("device");
                UA.token_id =jo.getString("token_id");
                userAgents.add(UA);
            }