java 解析 JSON - 无法从 JsonObject 获取布尔值
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Parsing JSON - Can't get boolean value from JsonObject
提问by I wrestled a bear once.
I've been trying to figure out how to do some basic stuff in Java..
我一直在试图弄清楚如何在 Java 中做一些基本的事情..
I've got a request being made to an API, which returns the following JSON.
我收到了一个对 API 的请求，它返回以下 JSON。
{"success": false, "message": "some string", "data": []}
This is represented by the String resultin the following:
这由以下字符串表示result：
JsonObject root = new JsonParser().parse(result).getAsJsonObject();
success = root.getAsJsonObject("success").getAsBoolean();
I need to get the "success" parameter as a boolean. Getting an error on the getAsBoolean()call.
我需要将“成功”参数作为布尔值获取。getAsBoolean()通话出错。
java.lang.ClassCastException: com.google.gson.JsonPrimitive cannot be cast to com.google.gson.JsonObject
java.lang.ClassCastException: com.google.gson.JsonPrimitive 无法转换为 com.google.gson.JsonObject
What am I doing wrong? How do I get the bool value of "success"?
我究竟做错了什么？如何获得“成功”的布尔值？
回答by ΦXoc? ? Пepeúpa ツ
The reason that is breaking your code is that you are calling the wrong method...
破坏你的代码的原因是你调用了错误的方法......
Do
做
success = root.get("success").getAsBoolean();
instead of
代替
success = root.getAsJsonObject("success").getAsBoolean();
Example:
例子：
public static void main(String[] args) {
String result = "{\"success\": false, \"message\": \"some string\", \"data\": []}";
JsonObject root = new JsonParser().parse(result).getAsJsonObject();
boolean success = root.get("success").getAsBoolean();
}
回答by ikryvorotenko
you're calling root.getAsJsonObject("success")while the successis a boolean value itself, not an object.
您在调用root.getAsJsonObject("success")时调用的success是布尔值本身，而不是对象。
Try following
尝试以下
JsonObject root = new JsonParser().parse(result).getAsJsonObject();
success = root.get("success").getAsBoolean();
回答by Dalton D
I would just use the root.get("success") method. Success isn't really a json object, it's a member of a json object. See here https://google.github.io/gson/apidocs/com/google/gson/JsonObject.html#get-java.lang.String-
我只会使用 root.get("success") 方法。成功并不是真正的 json 对象，而是 json 对象的成员。请参阅此处https://google.github.io/gson/apidocs/com/google/gson/JsonObject.html#get-java.lang.String-
回答by zardilior
If root is a jsonObject
如果 root 是一个 jsonObject
root.getBoolean("success");
