Unity 讀取Json

Unity讀取Json算是一個很常用的功能，今天來小小的總結一下。

首先你得寫個json，百度Json可以找到很多接送工具。

比如我寫的json，注意：因爲有中文，所以要保存UTF-8的格式。後綴名可以爲.txt 也可以爲.json

第一種，JsonData讀取的方式，這種方法比較直接，先把數據拿過來再處理

        StreamReader streamreader = new StreamReader(Application.dataPath + "/StreamingAssets/Test.txt");   //讀取數據，轉換成數據流
        JsonReader jsonReader = new JsonReader(streamreader);                                               //轉換成json數據
        JsonData jsonData = JsonMapper.ToObject(jsonReader);                                                //轉化爲jsonData
        for (int i = 0; i < jsonData[0][0].Count; i++)
        {
            Debug.Log(jsonData[0][i]["id"] + "    " + jsonData[0][i]["name"] + "    " + jsonData[0][i]["age"]);
        }

運行結果

第二種，先寫好接收Json的類，再用類的實例去接收，這種開始要蠻煩一點，但後面用起來就比較有條理

定義json數據的類

public class PlayerInfo {
    public string id;
    public string name;
    public int age;
}

public class Root
{
    public List<PlayerInfo> sites;
}

讀取json

        StreamReader streamreader = new StreamReader(Application.dataPath + "/StreamingAssets/Test.txt");   //讀取數據，轉換成數據流
        JsonReader jsonReader = new JsonReader(streamreader);                                               //轉換成json數據
        Root root = JsonMapper.ToObject<Root>(jsonReader);                                                //轉化爲jsonData
        Debug.Log(root.sites.Count);
        for (int i = 0; i < root.sites.Count; i++)
        {
            Debug.Log(root.sites[i].id + "    " + root.sites[i].name + "    " + root.sites[i].age);
        }

另外，JsonMapper的ToObject方法可以讀取三種類容JsonReader、TextReader和String，上面用的讀是JsonReader的方法

        public static JsonData ToObject(JsonReader reader);
        public static JsonData ToObject(TextReader reader);
        public static JsonData ToObject(string json);
        public static T ToObject<T>(JsonReader reader);
        public static T ToObject<T>(TextReader reader);
        public static T ToObject<T>(string json);

來看看string讀取（1）路徑加載文本

        //StreamReader streamreader = new StreamReader(Application.dataPath + "/StreamingAssets/Test.txt");   //讀取數據，轉換成數據流
        //JsonReader jsonReader = new JsonReader(streamreader);                                               //轉換成json數據
        string jsonStr = File.ReadAllText(Application.dataPath + "/StreamingAssets/Test.txt");                //讀取數據，轉換成數string
        Root root = JsonMapper.ToObject<Root>(jsonStr);                                                //轉化爲jsonData
        Debug.Log(root.sites.Count);
        for (int i = 0; i < root.sites.Count; i++)
        {
            Debug.Log(root.sites[i].id + "    " + root.sites[i].name + "    " + root.sites[i].age);
        }

string讀取（2）Resource加載文本

        //StreamReader streamreader = new StreamReader(Application.dataPath + "/StreamingAssets/Test.txt");   //讀取數據，轉換成數據流
        //JsonReader jsonReader = new JsonReader(streamreader);                                               //轉換成json數據
        //string jsonStr = File.ReadAllText(Application.dataPath + "/StreamingAssets/Test.txt");              //讀取數據，轉換成數string
        TextAsset textAsset = Resources.Load("Test") as TextAsset;
        string jsonStr = textAsset.text;
        Root root = JsonMapper.ToObject<Root>(jsonStr);                                                //轉化爲jsonData
        Debug.Log(root.sites.Count);
        for (int i = 0; i < root.sites.Count; i++)
        {
            Debug.Log(root.sites[i].id + "    " + root.sites[i].name + "    " + root.sites[i].age);
        }

TextReader讀取

        //StreamReader streamreader = new StreamReader(Application.dataPath + "/StreamingAssets/Test.txt");   //讀取數據，轉換成數據流
        //JsonReader jsonReader = new JsonReader(streamreader);                                               //轉換成json數據
        //string jsonStr = File.ReadAllText(Application.dataPath + "/StreamingAssets/Test.txt");              //讀取數據，轉換成數string
        //TextAsset textAsset = Resources.Load("Test") as TextAsset;
        //string jsonStr = textAsset.text;
        TextReader textReader = new StreamReader(Application.dataPath + "/StreamingAssets/Test.txt");
        Root root = JsonMapper.ToObject<Root>(textReader);                                                //轉化爲jsonData
        Debug.Log(root.sites.Count);
        for (int i = 0; i < root.sites.Count; i++)
        {
            Debug.Log(root.sites[i].id + "    " + root.sites[i].name + "    " + root.sites[i].age);
        }

好了，差不多就是這樣