解析JSON多个对象

Question

我正在尝试解析以下json，但由于出现堆栈溢出错误而无法做到这一点。

这是JSON-

[{
    "Class": "1",
    "school": "test",
    "description": "test",
    "student": [
        "Student1",
        "Student2"
    ],
    "qualify": true,
    "annualFee": 3.00
}]

这是当前失败的代码。

String res  = cspResponse.prettyPrint();
org.json.JSONObject obj = new org.json.JSONObject(res);
org.json.JSONArray arr = obj.getJSONArray(arrayName);
String dataStatus=null;

for (int i = 0; i < arr.length(); i++) {
    dataStatus = arr.getJSONObject(i).getString(key);
    System.out.println("dataStatus is \t" + dataStatus);
}

用例是：

1. 获取值键“类”
2. 从学生那里获得价值
3. 从学校获得价值

我感谢您的帮助。

update-1 使用以下详细信息更新有关堆栈跟踪的更多信息。cls = 1

错误- org.json.JSONException: JSONObject["student "] not a string.

堆栈跟踪-

public String getString(String key) throws JSONException {
        Object object = this.get(key);
        if (object instanceof String) {
            return (String) object;
        }
        throw new JSONException("JSONObject[" + quote(key) + "] not a string.");
    }

当我使用以下答案运行代码时，此处对学生而言失败的不是字符串。

我从前两个注释中使用的答案都具有相同的错误。我请你帮忙。

Answer 1

您的json片段无效-最后一个逗号中断了解析。但是其余的代码是相当可行的。

    String res = "[\n" +
            "    {\n" +
            "        \"Class\": \"1\",\n" +
            "        \"school\": \"test\",\n" +
            "        \"description\": \"test\",\n" +
            "        \"student\": [\n" +
            "            \"Student1\",\n" +
            "            \"Student2\"\n" +
            "        ],\n" +
            "        \"qualify\": true,\n" +
            "        \"annualFee\": 3.00\n" +
            "       }\n" +
            "]";

    JSONArray arr = new JSONArray(res);
    for (int i = 0; i < arr.length(); i++) {
        JSONObject block = arr.getJSONObject(i);
        Integer cls = block.getInt("Class");
        System.out.println("cls = " + cls);
        Object school = block.getString("school");
        System.out.println("school = " + school);
        JSONArray students = block.getJSONArray("student");
        System.out.println("student[0] = " + students.get(0));
        System.out.println("student[1] = " + students.get(1));
    }

应该输出

cls = 1
school = test
student[0] = Student1
student[1] = Student2