JSON字符串到Java對象GSON

Question

我在這個格式的JSON字符串：

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

解析它，我創建一個Java類：

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

現在我跟着GSON文件，並嘗試exract data：

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

我從Gson API得到解析錯誤，我做錯了什麼？

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

Answer 1

爲了解析json像下面的類

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

你需要一個json類似如下

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

至於你的異常清晰地說：BEGIN_ARRAY but was STRING所以你必須使用數組中json解析。

在如果你想有一個類的評論

的答覆在解析以下JSON

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

然後，你將不得不類結構如下

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

Answer 2

按JSON的，此類結構的工作原理如下：

class data { 
List <Map<String,Content> data; 
/* getter and setter for the attribute above */ 
... 

}