[英]Using Google GSON to convert String to JSON Array
I am using the Google GSON library to convert an ArrayList of countries into JSON: 我正在使用Google GSON库将国家/地区的ArrayList转换为JSON:
ArrayList<String> countries = new ArrayList<String>();
// arraylist gts populated
Gson gson = new Gson();
String json = gson.toJson(countries);
Which yields: 产生:
["AFGHANISTAN","ALBANIA","ALGERIA","ANDORRA","ANGOLA","ANGUILLA","ANTARCTICA","ANTIGUA AND BARBUDA","ARGENTINA","ARMENIA","ARUBA","ASHMORE AND CARTIER ISLANDS","AUSTRALIA","AUSTRIA","AZERBAIJAN"]
How can I modify my code to generate a JSON Array? 如何修改代码以生成JSON数组? For example: 例如:
[
{
"AFGHANISTAN",
"ALBANIA",
"ALGERIA",
"ANDORRA",
"ANGOLA",
"ANGUILLA",
"ANTARCTICA",
"ANTIGUA AND BARBUDA",
"ARGENTINA",
"ARMENIA",
"ARUBA",
"ASHMORE AND CARTIER ISLANDS",
"AUSTRALIA",
"AUSTRIA",
"AZERBAIJAN"
}
]
Thanks! 谢谢!
Here is the code that my Java client uses to parse web service responses that already contain the curly-braces. 这是Java客户端用来解析已经包含花括号的Web服务响应的代码。 This is why I want the countries response to contain the curly braces: 这就是为什么我希望这些国家/地区的响应包含花括号:
Gson gson = new GsonBuilder().create();
ArrayList<Map<String, String>> myList = gson.fromJson(result,
new TypeToken<ArrayList<HashMap<String, String>>>() {
}.getType());
List<Values> list = new ArrayList<Values>();
for (Map<String, String> m : myList) {
list.add(new Values(m.get(attribute)));
}
To build the string you show us, which isn't JSON at all, you may do this : 要构建您显示给我们的字符串(根本不是JSON),您可以执行以下操作:
StringBuilder sb = new StringBuilder("[{");
for (int i=0; i<countries.size(); i++) {
sb.append("\"").append(countries.get(i)).append("\"");
if (i<countries.size()-1) sb.append(",");
}
sb.append("}]");
String theString = sb.toString();
I'd recommend not trying to use Gson, which is only dedicated to JSON. 我建议不要尝试使用仅用于JSON的Gson。
A simple text-representation of an array in JSON is exactly what Gson returns. Gson返回的就是JSON中数组的简单文本表示形式。 What for do you need that curly-braces style? 您需要那种花括号样式吗?
Using curly-braces is not a "style", it is how JSON denotes an object. 使用花括号不是“样式”,而是JSON表示对象的方式。 square brackets represent a list, and curly-braces are used to represent an object, which in Javascript behaves like a map. 方括号表示列表,大括号表示对象,在Javascript中其行为类似于地图。 Putting curly braces around the list entries is nonsensical because within the object you need name-value pairs (just like a map). 将花括号放在列表条目周围是没有意义的,因为在对象内需要名称/值对(就像地图一样)。
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