GSON抛出“预期BEGIN_OBJECT但是是BEGIN_ARRAY”?

问题:

我正在尝试解析一个这样的JSON字符串

[
   {
      "updated_at":"2012-03-02 21:06:01",
      "fetched_at":"2012-03-02 21:28:37.728840",
      "description":null,
      "language":null,
      "title":"JOHN",
      "url":"http://rus.JOHN.JOHN/rss.php",
      "icon_url":null,
      "logo_url":null,
      "id":"4f4791da203d0c2d76000035",
      "modified":"2012-03-02 23:28:58.840076"
   },
   {
      "updated_at":"2012-03-02 14:07:44",
      "fetched_at":"2012-03-02 21:28:37.033108",
      "description":null,
      "language":null,
      "title":"PETER",
      "url":"http://PETER.PETER.lv/rss.php",
      "icon_url":null,
      "logo_url":null,
      "id":"4f476f61203d0c2d89000253",
      "modified":"2012-03-02 23:28:57.928001"
   }
]

进入对象列表。

List<channelSearchEnum> lcs = (List<channelSearchEnum>) new Gson().fromJson( jstring , channelSearchEnum.class);

这是我正在使用的一个对象类。

import com.google.gson.annotations.SerializedName;

public class channelSearchEnum {



@SerializedName("updated_at")
private String updated_at;

@SerializedName("fetched_at")
private String fetched_at;

@SerializedName("description")
private String description;

@SerializedName("language")
private String language;

@SerializedName("title")
private String title;

@SerializedName("url")
private String url;

@SerializedName("icon_url")
private String icon_url;

@SerializedName("logo_url")
private String logo_url;

@SerializedName("id")
private String id;

@SerializedName("modified")
private String modified;

public final String get_Updated_at() {
    return this.updated_at;
}

public final String get_Fetched_at() {
    return this.fetched_at;
}

public final String get_Description() {
    return this.description;
}

public final String get_Language() {
    return this.language;
}

public final String get_Title() {
    return this.title;
}

public final String get_Url() {
    return this.url;
}

public final String get_Icon_url() {
    return this.icon_url;
}

public final String get_Logo_url() {
    return this.logo_url;
}

public final String get_Id() {
    return this.id;
}

public final String get_Modified() {
    return this.modified;
}

        }

但它让我

com.google.gson.JsonSyntaxException: java.lang.IllegalStateException: Expected BEGIN_OBJECT but was BEGIN_ARRAY at line 1 column 2

任何想法应该如何解决?

回答:

问题是你告诉Gson你有一个你的类型的对象。你没有你有一个类型的对象数组。你不能只是尝试和投射这样的结果,并期望它神奇地工作;)
Gson的用户指南说明如何处理:
 https://github.com/google/gson/blob/master/UserGuide.md
这将工作:

channelSearchEnum[] enums = gson.fromJson(yourJson, channelSearchEnum[].class);

但这更好:

Type collectionType = new TypeToken<Collection<channelSearchEnum>>(){}.getType();
Collection<channelSearchEnum> enums = gson.fromJson(yourJson, collectionType);

 
 
Code问答: http://codewenda.com/topics/python/
Stackoverflow: GSON throwing “Expected BEGIN_OBJECT but was BEGIN_ARRAY”?

*转载请注明本文链接以及stackoverflow的英文链接

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