解析JSON数组给出错误 [英] parsing JSON array gives error

问题描述

我有以下Javascript对象：

I have the following Javascript object:

var o = {
      "username":"username",
      "args": [
          "1", "2", "3"
      ]
};

并像这样发送：

xhr.send(JSON.stringify(o));

我的Java类：

public class Command implements Serializable {
    private String username;
    private String[] args;
    //getters, setters constructors etc.
}

在我的servlet中：

And in my servlet:

@Override
public void doPost(HttpServletRequest request, HttpServletResponse response){
    Command c;

    try {
        c = gson.fromJson(request.getReader(), Command.class);
    } catch(Exception e) {
            .
            .
            .

给出错误：期望BEGIN_ARRAY但在第1行X列处为STRING ，其中列号X是 [以字符串化JSON出现。

Gives the error: Expected BEGIN_ARRAY but was STRING at line 1 column X, where column number X is where the "[ appears in stringified JSON.

据我了解，这应该是非常简单明了的事情。我在做什么错？

From what I understand this should be a very simple and straightforward thing. What am I doing wrong?

编辑：我认为这可能与 JSON.stringify（）行为有关字符串的Javascript数组。

I think it may be related to JSON.stringify() behavior with Javascript arrays of strings.

JSON.stringify（o）返回：

"{"username":"username","args":"[\"1\", \"2\", \"3\"]"}"

推荐答案

我认为您字符串化结果中的引号太多。

I think you have one too many quotes in your stringify result. When I construct the object like this:

 var o = {
            username: "username",
            args: ["1","2","3"]
        };

调用 JSON.stringify（o）

的结果是这个

"{\"username\":\"username\",\"args\":[\"1\",\"2\",\"3\"]}"

注意在方括号中没有引号。

notice there are no quotes around my square brackets.

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