java GSON 期望 BEGIN_ARRAY 但 BEGIN_OBJECT？
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GSON Expected BEGIN_ARRAY but was BEGIN_OBJECT?
提问by Slasch
I just start to learn about gson. I see lot of topic about this error, but i don't find any help or answer corresponding of my problem.
我刚开始学习gson。我看到很多关于这个错误的话题，但我没有找到与我的问题相对应的任何帮助或答案。
I'm trying to parse a JSON string like this one:
我正在尝试解析这样的 JSON 字符串：
{
"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
}
into an objects
成一个对象
InfoSecuriteBean mInfoSecuriteBean = gson.fromJson(reader, InfoSecuriteBean.class);
Here's object class I'm using.
这是我正在使用的对象类。
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
and the other object use
和另一个对象使用
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
But it throws me with
但它让我感到
com.google.gson.JsonSyntaxException: java.lang.IllegalStateException: Expected BEGIN_ARRAY but was BEGIN_OBJECTat line 1 column 60
Any ideas how should I fix it?
任何想法我应该如何解决它？
Thanks!
谢谢！
EDIT
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)
EDIT 2
编辑 2
The problem come from the two HashMap>
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>>();
if i comment this properties i don't have any probleme to build my json objet.
如果我评论这个属性，我就没有任何问题来构建我的 json 对象。
I found this link Deserializing a Map<String, Object> field with Gson
我发现这个链接用 Gson 反序列化一个 Map<String, Object> 字段
Currently i try something like this
目前我尝试这样的事情
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;
}
}
Do you think i'm in the good way to resolve my problem ?
你认为我能很好地解决我的问题吗？
回答by Jesse Wilson
Upgrade to the latest Gson and it'll tell you exactly where there's a mismatch. Typically this happens when your model has a Listbut your JSON doesn't (ie. no [...]).
升级到最新的 Gson，它会准确地告诉您哪里不匹配。通常，当您的模型有 aList但您的 JSON 没有（即 no [...]）时，会发生这种情况。
回答by Slasch
I found a simply solution for solve my problem. I will show here my solution, maybe this will help some people.
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，也许这会帮助一些人。
So I created two new class : HabilitationAD and HabilitationInterprete
所以我创建了两个新类：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;
}
}
and :
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;
}
And I modify my class InfoSecuriteBean
我修改了我的课程 InfoSecuriteBean
I changed this :
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>>();
by this :
这样 ：
@SerializedName("HabilitationAD")
private List<HabilitationAD> habilitationAD;
@SerializedName("HabilitationInterprete")
private List<HabilitationInterprete> habilitationInterprete;
Now all work great ! Hope this solution will help !
现在一切都很好！希望这个解决方案会有所帮助！
回答by Mehdi
the error you're getting is pretty standard. Gson cannot deserialize nested objects. Gotta write your own adapters.
你得到的错误是非常标准的。Gson 不能反序列化嵌套对象。必须编写自己的适配器。
So you have to learn how to write a custom deserializer (very easy) and then register it when you create your gson object.
因此，您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。
Feel free to ask more questions.
随意提出更多问题。
