Java JSONObject 文本必须以“{”错误开头
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A JSONObject text must begin with '{' error
提问by Pradeep Simha
I have this JSON coming from one of our REST service:
我有来自我们的 REST 服务之一的这个 JSON：
[
"{\"category_name\":[\"Industry Components\"],\"categoryId\":[1]}",
"{\"category_name\":[\"Business Components\"],\"categoryId\":[2]}",
"{\"category_name\":[\"Utilities\"],\"categoryId\":[3]}",
"{\"category_name\":[\"Tools\"],\"categoryId\":[4]}
]
I am using java-json.jar to parse this JSON, this is the simple snippet where I am trying to pass above JSON string:
我正在使用 java-json.jar 来解析这个 JSON，这是我试图在 JSON 字符串上方传递的简单片段：
JSONObject jsonObject = new JSONObject(jsonStr);
But I am getting below exception:
但我得到以下异常：
org.json.JSONException: A JSONObject text must begin with '{' at 1 [character 2 line 1]
First I assumed it's because of [and ]characters in JSON and I tried to replace as below:
首先，我认为这是因为JSON 中的[和]字符，我尝试替换如下：
String replacedStr = jsonStr.replaceAll("\[", "").replaceAll("\]", "")
But even then I am getting same exception. Can anyone please guide me to know what I am doing wrong?
但即便如此，我也遇到了同样的例外。谁能指导我知道我做错了什么？
采纳答案by popfalushi
I suppose that you should use not JSONObject, but JSONArray
我想你不应该使用 JSONObject，而是 JSONArray
回答by Sunil B N
JSON Object follows the following Structure:
JSON 对象遵循以下结构：
{
"array": [
{
color: "red",
value: "#f00"
},
{
color: "green",
value: "#0f0"
}
]
}
JSON Array follows the following Structure:
JSON 数组遵循以下结构：
[
{ "firstName":"John" , "lastName":"Doe" },
{ "firstName":"Anna" , "lastName":"Smith" },
{ "firstName":"Peter" , "lastName": "Jones" }
]
回答by Amol Chaure
If you get JSONObject text must begin with '{' exception. Then first off all check what did u pass to the JSONObject constructor.
如果您得到 JSONObject 文本必须以 '{' 异常开头。然后首先检查你传递给 JSONObject 构造函数的内容。
You should pass the right json.txt file.So make sure what are u passing to jsonobject.
您应该传递正确的 json.txt 文件。所以请确保您传递给 jsonobject 的是什么。
String request = FileUtils.readFileToString(new File("/home/achaure/Downloads/Amol/KountRestTest/Documents/request.txt"));
JSONObject jsonObject = new JSONObject(request);
回答by Andres Navarro
instead
反而
JSONObject jsonObject = new JSONObject(jsonStr);
use
用
JSONArray jsonArray = new JSONArray(jsonStr);
and may be read about Gson is a nice library for parsing and work with json
并且可能会读到 Gson 是一个很好的用于解析和使用 json 的库
