GSON 预计 BEGIN_ARRAY 但 BEGIN_OBJECT？

Question

刚开始学习gson。我看到很多关于这个错误的话题，但我没有找到任何帮助或对应我的问题的答案。

我正在尝试解析 JSON 字符串，如下所示：

{
"CodeAnalytique": "XXXX",
  "Domaine": "XXXX",
  "HabilitationAD": [
    {
      "Key": "XXXX",
      "Value": [
        {
          "Applicatif": "XXXX",
          "Cle": "E",
          "Role": "Red",
          "Valeur": "XXXX"
        },
        {
          "Applicatif": "XXXX",
          "Cle": "E",
          "Role": "Red",
          "Valeur": "XXXX"
        }
        //lot of other value
        ]
    }
  ],
  "HabilitationInterprete": [
    {
      "Key": "XX",
      "Value": [
        {
          "Applicatif": "XXXX",
          "Cle": "Z",
          "Role": "Red",
          "Valeur": "XXX"
        },
        {
          "Applicatif": "XXXX",
          "Cle": "Z",
          "Role": "Red",
          "Valeur": "XXXX"
        }
        //lot of other value
        ]
    }
  ],
  "Identity": "XXXX",
  "InfoConsolidee": "Operation requested at XXXX",
  "IsAdminI": true,
  "IsAdminM": false,
  "IsAuthentif": true,
  "Matricule": "XXX",
  "Nom": "XXXX",
  "PasswordEnvoye": "XXXX",
  "Prenom": "XXX",
  "PrincipalPermissionMode": 1,
  "RoleSGBD": [
    "xxxx"
  ],
  "RoleSI": [
    null,
    "APP_02",
    "APP_03",
   //lot of other value
  ],
  "Societe": "XXX",
  "TypeClient": null
}

成对象

InfoSecuriteBean mInfoSecuriteBean = gson.fromJson(reader, InfoSecuriteBean.class);

这是我正在使用的对象class。

import com.google.gson.annotations.SerializedName;

import java.util.HashMap;
import java.util.List;
import java.util.Map;

public class InfoSecuriteBean {

    @SerializedName("IsAuthentif")
    private boolean mIsAuthentif = false;

    @SerializedName("PrincipalPermissionMode")
    private enumPrincipalPermissionMode mPrincipalPermissionMode;
    @SerializedName("RoleSGBD")
    private List<String> mRoleSGBD;
    @SerializedName("RoleSI")
    private List<String> mRoleSI;
    @SerializedName("Identity")
    private String mIdentity = null;
    @SerializedName("Password")
    private String mPassword = null;
    @SerializedName("InfoConsolidee")
    private String mInfoConsolidee = null;

    @SerializedName("IsAdminM")
    private boolean mIsAdminM = false;
    @SerializedName("IsAdminI")
    private boolean mIsAdminI = false;

    @SerializedName("Matricule")
    private String mMatricule = null;
    @SerializedName("Nom")
    private String mNom = null;
    @SerializedName("Prenom")
    private String mPrenom = null;
    @SerializedName("CodeAnalytique")
    private String mCodeAnalytique = null;
    @SerializedName("Domaine")
    private String mDomaine = null;
    @SerializedName("Societe")
    private String mSociete = null;
    @SerializedName("TypeClient")
    private String mTypeClient = null;

    @SerializedName("HabilitationAD")
    private Map<String,List<HabilitationBean>> mHabilitationAD = new HashMap<String, List<HabilitationBean>>();
    @SerializedName("HabilitationInterprete")
    private Map<String,List<HabilitationBean>> mHabilitationInterprete = new HashMap<String, List<HabilitationBean>>();
//Getter and setter

另一个对象使用

import com.google.gson.annotations.SerializedName;

public class HabilitationBean
{
    @SerializedName("Applicatif")
    private String mApplicatif = null;
    @SerializedName("Role")
    private String mRole = null;
    @SerializedName("Cle")
    private String mCle = null;
    @SerializedName("Valeur")
    private String mValeur = null;

//getter and setter

但它让我觉得

com.google.gson.JsonSyntaxException: java.lang.IllegalStateException: Expected BEGIN_ARRAY but was BEGIN_OBJECTat line 1 column 60

有什么办法可以解决吗？

谢谢！

编辑

Caused by: com.google.gson.JsonSyntaxException: java.lang.IllegalStateException: Expected BEGIN_ARRAY but was BEGIN_OBJECT at line 1 column 60 path $.HabilitationAD[0]
            at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.read(ReflectiveTypeAdapterFactory.java:200)
            at com.google.gson.Gson.fromJson(Gson.java:810)
            at com.google.gson.Gson.fromJson(Gson.java:748)
            at com.sig.webservice.WebSecurityGBD.doInBackground(WebSecurityGBD.java:69)
            at com.sig.webservice.WebSecurityGBD.doInBackground(WebSecurityGBD.java:23)
            at android.os.AsyncTask.call(AsyncTask.java:292)
            at java.util.concurrent.FutureTask.run(FutureTask.java:237)
            at android.os.AsyncTask$SerialExecutor.run(AsyncTask.java:231)
            at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
            at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
            at java.lang.Thread.run(Thread.java:818)
     Caused by: java.lang.IllegalStateException: Expected BEGIN_ARRAY but was BEGIN_OBJECT at line 1 column 60 path $.HabilitationAD[0]
            at com.google.gson.stream.JsonReader.beginArray(JsonReader.java:350)
            at com.google.gson.internal.bind.MapTypeAdapterFactory$Adapter.read(MapTypeAdapterFactory.java:172)
            at com.google.gson.internal.bind.MapTypeAdapterFactory$Adapter.read(MapTypeAdapterFactory.java:145)
            at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.read(ReflectiveTypeAdapterFactory.java:103)
            at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.read(ReflectiveTypeAdapterFactory.java:196)
            at com.google.gson.Gson.fromJson(Gson.java:810)
            at com.google.gson.Gson.fromJson(Gson.java:748)
            at com.sig.webservice.WebSecurityGBD.doInBackground(WebSecurityGBD.java:69)
            at com.sig.webservice.WebSecurityGBD.doInBackground(WebSecurityGBD.java:23)
            at android.os.AsyncTask.call(AsyncTask.java:292)
            at java.util.concurrent.FutureTask.run(FutureTask.java:237)
            at android.os.AsyncTask$SerialExecutor.run(AsyncTask.java:231)
            at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
            at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
            at java.lang.Thread.run(Thread.java:818)

编辑 2

问题出在两个HashMap>

 @SerializedName("HabilitationAD")
        private Map<String,List<HabilitationBean>> mHabilitationAD = new HashMap<String, List<HabilitationBean>>();
        @SerializedName("HabilitationInterprete")
        private Map<String,List<HabilitationBean>> mHabilitationInterprete = new HashMap<String, List<HabilitationBean>>();

如果我评论这个属性我没有任何问题来构建我的 json objet。

我找到了这个linkDeserializing a Map<String, Object> field with Gson

目前我正在尝试这样的事情

public class InfoSecuriteBeanDeserializer implements JsonDeserializer<InfoSecuriteBean> {

    @Override
    public InfoSecuriteBean deserialize(JsonElement json, Type type, JsonDeserializationContext jsonDeserializationContext) throws JsonParseException {

        JsonArray jArray = (JsonArray) json;

        InfoSecuriteBean mInfoSecuriteBean = new InfoSecuriteBean();

        for (int i=1; i<jArray.size(); i++) {
            JsonObject jObject = (JsonObject) jArray.get(i);
            //assuming you have the suitable constructor...
            HabilitationBean mHabilitationBean = new HabilitationBean(jObject.get("Applicatif").getAsString(),
                    jObject.get("Cle").getAsString(),
                    jObject.get("Role").getAsString(),
                    jObject.get("Valeur").getAsString());
            mInfoSecuriteBean.getmHabilitationAD().add(mHabilitationBean);
        }

        return mInfoSecuriteBean;
    }
}

你认为我能很好地解决我的问题吗？

Answer 1

您遇到的错误很正常。 Gson 不能反序列化嵌套对象。必须编写自己的适配器。

所以你必须学习如何编写自定义反序列化器（非常简单），然后在创建 gson 对象时注册它。

欢迎提出更多问题。

Answer 2

升级到最新的 Gson，它会准确告诉您哪里不匹配。通常，当您的模型有 List 但您的 JSON 没有（即没有 [...]）时，就会发生这种情况。

Answer 3

我找到了一个简单的解决方案来解决我的问题。我会在这里展示我的解决方案，也许这会对一些人有所帮助。

所以我创建了两个新的 class：HabilitationAD 和 HabilitationInterprete

public class HabilitationAD {

    @SerializedName("Key")
    private String mKey;

    @SerializedName("Value")
    private List<BeanHabilitation> mValue;

    public String getmKey() {
        return mKey;
    }

    public void setmKey(String mKey) {
        this.mKey = mKey;
    }

    public List<BeanHabilitation> getmValue() {
        return mValue;
    }

    public void setmValue(List<BeanHabilitation> mValue) {
        this.mValue = mValue;
    }

    public HabilitationAD(){

    }

    public HabilitationAD(String p_mKey, List<BeanHabilitation> p_mValue){
        this.mKey = p_mKey;
        this.mValue = p_mValue;
    }
}

和：

    public class HabilitationInterprete {

        @SerializedName("Key")
        private String mKey;

        @SerializedName("Value")
        private List<BeanHabilitation> mValue;

        public String getmKey() {
            return mKey;
        }

        public void setmKey(String mKey) {
            this.mKey = mKey;
        }

        public List<BeanHabilitation> getmValue() {
            return mValue;
        }

        public void setmValue(List<BeanHabilitation> mValue) {
            this.mValue = mValue;
        }

 public HabilitationInterprete(){

    }

    public HabilitationInterprete(String p_mKey, List<BeanHabilitation> p_mValue){
        this.mKey = p_mKey;
        this.mValue = p_mValue;
    }

然后我修改我的classInfoSecuriteBean

我改变了这个：

 @SerializedName("HabilitationAD")
    private Map<String,List<HabilitationBean>> mHabilitationAD = new HashMap<String, List<HabilitationBean>>();
    @SerializedName("HabilitationInterprete")
    private Map<String,List<HabilitationBean>> mHabilitationInterprete = new HashMap<String, List<HabilitationBean>>();

通过这个 :

@SerializedName("HabilitationAD")
    private List<HabilitationAD> habilitationAD;
    @SerializedName("HabilitationInterprete")
    private List<HabilitationInterprete> habilitationInterprete;

现在一切正常！希望这个解决方案能有所帮助！

GSON 预计 BEGIN_ARRAY 但 BEGIN_OBJECT？

GSON Expected BEGIN_ARRAY but was BEGIN_OBJECT?

java

android

web-services

gson