java - Json字符串转Java对象Gson

Question

我有一个以下格式的 json 字符串:

 [
   {
     "key1": { "key1":"val1","key2":"val2" },
     "key2": { "key1":"val1","key2":"val2" }
   }
]   

为了解析它，我创建了一个 java 类:

class data {
     String key;
     List <content> listdata;
     /* getter and setter for the attribute above */
     ...
   } 

现在我按照Gson文档，并尝试提取数据:

Gson gson =new Gson();
data[] ints = gson.fromJson(MyjsonString, data[].class); 

我从 Gson API 得到解析错误，我做错了什么？

java.lang.IllegalStateException: Expected BEGIN_ARRAY but was STRING at line 1 column 1 path

Answer 1

用于像下面的类一样解析json

class data {
String key;
List <content> listdata;
/* getter and setter for the attribute above */
...
} 

您需要一个json，如下所示

"data" : {
 "key": "value",
 "listdata": [{ content object key attributes here }]
}

由于您的异常清楚地表明 BEGIN_ARRAY but was STRING 因此您必须在 json 中使用数组进行解析。

回复您的评论

如果你想要一个解析以下 json 的类

{
 "key1": { "key1":"val1","key2":"val2" },
 "key2": { "key1":"val1","key2":"val2" }
}

那么你的类结构如下

class Data {
 Map<String, String> key1;
 Map<String, String> key2;
 /* getter and setter for the attribute above */
}