Android之Json ((JavaScript Object Notation))文件解析

Android之Json ((JavaScript Object Notation))文件解析

Json文件格式

对象{},

集合[]

数据类型：数字，字符串，布尔，集合[]，对象{}，null

数据间隔”,”

问题：相机功能缺失，部分相机功能通过config文件配置，config文件解析错误导致相机功能缺失。

排查原因：修改配置文件过程中，多提交了一个分号“””，相机可正常使用，排查耗时较长。

配置文件缓存在本地，文件路径/odm/......

文件名称:xx_xx_config

文件格式

[

{

 

},

......

......

{

“Tag”: “value”

“Type”: “value”

“Count”: “value”

“Value”: “value”

}

]

1. 工具

android.jar

1.JSONArray

2.FileInputStream

(0)

所有需要配置的key缓存在map中并设置默认值

defaultMap.put(key,defaultValue)

1. 获取本地文件IO流

FileInputStream  fileInputStream = new  FileInputStream (path)

1. IO流获取字节流并缓存

byte[] buffer = new byte[inputStream.available()];

inputStream.read(buffer);

(3)编码新的字符串

String jsonString = new String(buffer, "UTF-8")

(4)字符串转储至jsonArray  

JSONArray jsonArray = new JSONArray(jsonString);

1. 获取解析的JsonArray对象

JsonArray.length返回对象数组size

JSONObject jsonObject = jsonArray.getJSONObject(i);

key = jsonObject.getString("VendorTag");

value = jsonObject.getString("Value");

参考链接:

https://blog.youkuaiyun.com/qq_32253371/article/details/78083391?ops_request_misc=%257B%2522request%255Fid%2522%253A%2522160671272819724813268905%2522%252C%2522scm%2522%253A%252220140713.130102334..%2522%257D&request_id=160671272819724813268905&biz_id=0&utm_medium=distribute.pc_search_result.none-task-blog-2~all~top_click~default-2-78083391.pc_first_rank_v2_rank_v28&utm_term=JSONArray&spm=1018.2118.3001.4449

https://blog.youkuaiyun.com/gao_sl/article/details/81699063?utm_medium=distribute.pc_relevant.none-task-blog-BlogCommendFromBaidu-2.control&depth_1-utm_source=distribute.pc_relevant.none-task-blog-BlogCommendFromBaidu-2.control

源码：

    /**

     * Creates a new {@code JSONArray} with values from the JSON string.

     *

     * @param json a JSON-encoded string containing an array.

     * @throws JSONException if the parse fails or doesn't yield a {@code

     *     JSONArray}.

     */

    public JSONArray(String json) throws JSONException {

        this(new JSONTokener(json));

}

 

 

    /**

     * Creates a new {@code JSONArray} with values from the given primitive array.

     */

    public JSONArray(JSONTokener readFrom) throws JSONException {

        /*

         * Getting the parser to populate this could get tricky. Instead, just

         * parse to temporary JSONArray and then steal the data from that.

         */

        Object object = readFrom.nextValue();

        if (object instanceof JSONArray) {

            values = ((JSONArray) object).values;

        } else {

            throw JSON.typeMismatch(object, "JSONArray");

        }

    }