Unity json

本文介绍了一个用于Unity的轻量级JSON处理库MiniJSON,包括其核心类Json的使用方法,支持基本类型、对象和数组的序列化与反序列化。同时提供了一个具体的用户数据反序列化案例。

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MiniJSON.cs

using UnityEngine;
using System;
using System.Collections;
using System.Collections.Generic;
using System.IO;
using System.Text;

namespace MiniJSON
{

    public static class Json
    {
        /// <summary>
        /// Parses the string json into a value
        /// </summary>
        /// <param name="json">A JSON string.</param>
        /// <returns>An List<object>, a Dictionary<string, object>, a double, an integer,a string, null, true, or false</returns>
        public static object Deserialize(string json)
        {
            // save the string for debug information
            if (json == null)
            {
                return null;
            }

            return Parser.Parse(json);
        }

        sealed class Parser : IDisposable
        {
            const string WHITE_SPACE = " \t\n\r";
            const string WORD_BREAK = " \t\n\r{}[],:\"";

            enum TOKEN
            {
                NONE,
                CURLY_OPEN,
                CURLY_CLOSE,
                SQUARED_OPEN,
                SQUARED_CLOSE,
                COLON,
                COMMA,
                STRING,
                NUMBER,
                TRUE,
                FALSE,
                NULL
            };

            StringReader json;

            Parser(string jsonString)
            {
                json = new StringReader(jsonString);
            }

            public static object Parse(string jsonString)
            {
                using (var instance = new Parser(jsonString))
                {
                    return instance.ParseValue();
                }
            }

            public void Dispose()
            {
                json.Dispose();
                json = null;
            }

            Dictionary<string, object> ParseObject()
            {
                Dictionary<string, object> table = new Dictionary<string, object>();

                // ditch opening brace
                json.Read();

                // {
                while (true)
                {
                    switch (NextToken)
                    {
                        case TOKEN.NONE:
                            return null;
                        case TOKEN.COMMA:
                            continue;
                        case TOKEN.CURLY_CLOSE:
                            return table;
                        default:
                            // name
                            string name = ParseString();
                            if (name == null)
                            {
                                return null;
                            }

                            // :
                            if (NextToken != TOKEN.COLON)
                            {
                                return null;
                            }
                            // ditch the colon
                            json.Read();

                            // value
                            table[name] = ParseValue();
                            break;
                    }
                }
            }

            List<object> ParseArray()
            {
                List<object> array = new List<object>();

                // ditch opening bracket
                json.Read();

                // [
                var parsing = true;
                while (parsing)
                {
                    TOKEN nextToken = NextToken;

                    switch (nextToken)
                    {
                        case TOKEN.NONE:
                            return null;
                        case TOKEN.COMMA:
                            continue;
                        case TOKEN.SQUARED_CLOSE:
                            parsing = false;
                            break;
                        default:
                            object value = ParseByToken(nextToken);

                            array.Add(value);
                            break;
                    }
                }

                return array;
            }

            object ParseValue()
            {
                TOKEN nextToken = NextToken;
                return ParseByToken(nextToken);
            }

            object ParseByToken(TOKEN token)
            {
                switch (token)
                {
                    case TOKEN.STRING:
                        return ParseString();
                    case TOKEN.NUMBER:
                        return ParseNumber();
                    case TOKEN.CURLY_OPEN:
                        return ParseObject();
                    case TOKEN.SQUARED_OPEN:
                        return ParseArray();
                    case TOKEN.TRUE:
                        return true;
                    case TOKEN.FALSE:
                        return false;
                    case TOKEN.NULL:
                        return null;
                    default:
                        return null;
                }
            }

            string ParseString()
            {
                StringBuilder s = new StringBuilder();
                char c;

                // ditch opening quote
                json.Read();

                bool parsing = true;
                while (parsing)
                {

                    if (json.Peek() == -1)
                    {
                        parsing = false;
                        break;
                    }

                    c = NextChar;
                    switch (c)
                    {
                        case '"':
                            parsing = false;
                            break;
                        case '\\':
                            if (json.Peek() == -1)
                            {
                                parsing = false;
                                break;
                            }

                            c = NextChar;
                            switch (c)
                            {
                                case '"':
                                case '\\':
                                case '/':
                                    s.Append(c);
                                    break;
                                case 'b':
                                    s.Append('\b');
                                    break;
                                case 'f':
                                    s.Append('\f');
                                    break;
                                case 'n':
                                    s.Append('\n');
                                    break;
                                case 'r':
                                    s.Append('\r');
                                    break;
                                case 't':
                                    s.Append('\t');
                                    break;
                                case 'u':
                                    var hex = new StringBuilder();

                                    for (int i = 0; i < 4; i++)
                                    {
                                        hex.Append(NextChar);
                                    }

                                    s.Append((char)Convert.ToInt32(hex.ToString(), 16));
                                    break;
                            }
                            break;
                        default:
                            s.Append(c);
                            break;
                    }
                }

                return s.ToString();
            }

            object ParseNumber()
            {
                string number = NextWord;

                if (number.IndexOf('.') == -1)
                {
                    long parsedInt;
                    Int64.TryParse(number, out parsedInt);
                    return parsedInt;
                }

                double parsedDouble;
                Double.TryParse(number, out parsedDouble);
                return parsedDouble;
            }

            void EatWhitespace()
            {
                while (WHITE_SPACE.IndexOf(PeekChar) != -1)
                {
                    json.Read();

                    if (json.Peek() == -1)
                    {
                        break;
                    }
                }
            }

            char PeekChar
            {
                get
                {
                    return Convert.ToChar(json.Peek());
                }
            }

            char NextChar
            {
                get
                {
                    return Convert.ToChar(json.Read());
                }
            }

            string NextWord
            {
                get
                {
                    StringBuilder word = new StringBuilder();

                    while (WORD_BREAK.IndexOf(PeekChar) == -1)
                    {
                        word.Append(NextChar);

                        if (json.Peek() == -1)
                        {
                            break;
                        }
                    }

                    return word.ToString();
                }
            }

            TOKEN NextToken
            {
                get
                {
                    EatWhitespace();

                    if (json.Peek() == -1)
                    {
                        return TOKEN.NONE;
                    }

                    char c = PeekChar;
                    switch (c)
                    {
                        case '{':
                            return TOKEN.CURLY_OPEN;
                        case '}':
                            json.Read();
                            return TOKEN.CURLY_CLOSE;
                        case '[':
                            return TOKEN.SQUARED_OPEN;
                        case ']':
                            json.Read();
                            return TOKEN.SQUARED_CLOSE;
                        case ',':
                            json.Read();
                            return TOKEN.COMMA;
                        case '"':
                            return TOKEN.STRING;
                        case ':':
                            return TOKEN.COLON;
                        case '0':
                        case '1':
                        case '2':
                        case '3':
                        case '4':
                        case '5':
                        case '6':
                        case '7':
                        case '8':
                        case '9':
                        case '-':
                            return TOKEN.NUMBER;
                    }

                    string word = NextWord;

                    switch (word)
                    {
                        case "false":
                            return TOKEN.FALSE;
                        case "true":
                            return TOKEN.TRUE;
                        case "null":
                            return TOKEN.NULL;
                    }

                    return TOKEN.NONE;
                }
            }
        }

        /// <summary>
        /// Converts a IDictionary / IList object or a simple type (string, int, etc.) into a JSON string
        /// </summary>
        /// <param name="json">A Dictionary<string, object> / List<object></param>
        /// <returns>A JSON encoded string, or null if object 'json' is not serializable</returns>
        public static string Serialize(object obj)
        {
            return Serializer.Serialize(obj);
        }

        sealed class Serializer
        {
            StringBuilder builder;

            Serializer()
            {
                builder = new StringBuilder();
            }

            public static string Serialize(object obj)
            {
                var instance = new Serializer();

                instance.SerializeValue(obj);

                return instance.builder.ToString();
            }

            void SerializeValue(object value)
            {
                IList asList;
                IDictionary asDict;
                string asStr;

                if (value == null)
                {
                    builder.Append("null");
                }
                else if ((asStr = value as string) != null)
                {
                    SerializeString(asStr);
                }
                else if (value is bool)
                {
                    builder.Append(value.ToString().ToLower());
                }
                else if ((asList = value as IList) != null)
                {
                    SerializeArray(asList);
                }
                else if ((asDict = value as IDictionary) != null)
                {
                    SerializeObject(asDict);
                }
                else if (value is char)
                {
                    SerializeString(value.ToString());
                }
                else
                {
                    SerializeOther(value);
                }
            }

            void SerializeObject(IDictionary obj)
            {
                bool first = true;

                builder.Append('{');

                foreach (object e in obj.Keys)
                {
                    if (!first)
                    {
                        builder.Append(',');
                    }

                    SerializeString(e.ToString());
                    builder.Append(':');

                    SerializeValue(obj[e]);

                    first = false;
                }

                builder.Append('}');
            }

            void SerializeArray(IList anArray)
            {
                builder.Append('[');

                bool first = true;

                foreach (object obj in anArray)
                {
                    if (!first)
                    {
                        builder.Append(',');
                    }

                    SerializeValue(obj);

                    first = false;
                }

                builder.Append(']');
            }

            void SerializeString(string str)
            {
                builder.Append('\"');

                char[] charArray = str.ToCharArray();
                foreach (var c in charArray)
                {
                    switch (c)
                    {
                        case '"':
                            builder.Append("\\\"");
                            break;
                        case '\\':
                            builder.Append("\\\\");
                            break;
                        case '\b':
                            builder.Append("\\b");
                            break;
                        case '\f':
                            builder.Append("\\f");
                            break;
                        case '\n':
                            builder.Append("\\n");
                            break;
                        case '\r':
                            builder.Append("\\r");
                            break;
                        case '\t':
                            builder.Append("\\t");
                            break;
                        default:
                            int codepoint = Convert.ToInt32(c);
                            if ((codepoint >= 32) && (codepoint <= 126))
                            {
                                builder.Append(c);
                            }
                            else
                            {
                                builder.Append("\\u" + Convert.ToString(codepoint, 16).PadLeft(4, '0'));
                            }
                            break;
                    }
                }

                builder.Append('\"');
            }

            void SerializeOther(object value)
            {
                if (value is float
                    || value is int
                    || value is uint
                    || value is long
                    || value is double
                    || value is sbyte
                    || value is byte
                    || value is short
                    || value is ushort
                    || value is ulong
                    || value is decimal)
                {
                    builder.Append(value.ToString());
                }
                else
                {
                    SerializeString(value.ToString());
                }
            }
        }
    }
}


UserJsonDeserialize.cs

using UnityEngine;
using System.Collections;
using System.Collections.Generic;
/// <summary>
/// 用户反序列化类
/// </summary>
public class UserJsonDeserialize
{
    private List<UserModel> userList = new List<UserModel>();
    /// <summary>
    /// 用户实体集合
    /// </summary>
    public List<UserModel> UserList
    {
        get { return userList; }
        set { userList = value; }
    }
    /// <summary>
    /// 用户反序列化类构造函数
    /// </summary>
    /// <param name="jsonData">Json格式的字符串</param>
    public UserJsonDeserialize(string jsonData)
    {
        ParseJson(jsonData);
    }
    /// <summary>
    /// 解析Json
    /// </summary>
    /// <param name="jsonData">Json格式的字符串</param>
    private void ParseJson(string jsonData)
    {
        Dictionary<string, object> jsonObject = MiniJSON.Json.Deserialize(jsonData) as Dictionary<string, object>;
        List<object> userInfoListTemp = jsonObject["users"] as List<object>;
        foreach (var i in userInfoListTemp)
        {
            Dictionary<string, object> item = i as Dictionary<string, object>;
            UserModel u = new UserModel()
            {
                Id = int.Parse(item["id"].ToString()),
                UserId = item["userId"].ToString(),
                UserPwd = item["userPwd"].ToString(),
                Name = item["name"].ToString(),
                BackgroundAtlasName = item["backgroundAtlasName"].ToString(),
                SelfBackgroundSpriteName = item["selfBackgroundSpriteName"].ToString(),
                OtherBackgroundSpriteName = item["otherBackgroundSpriteName"].ToString(),
                HeadAtlasName = item["headAtlasName"].ToString(),
                HeadSpriteName = item["headSpriteName"].ToString(),
                HerosmallAtlasName = item["hero-smallAtlasName"].ToString(),
                HerosmallSpriteName = item["hero-smallSpriteName"].ToString(),
                BtnRightWidgetAtlasName = item["btnRightWidgetAtlasName"].ToString(),
                SelfBtnRightWidgetSpriteName = item["selfBtnRightWidgetSpriteName"].ToString(),
                OtherBtnRightWidgetSpriteName = item["otherBtnRightWidgetSpriteName"].ToString(),
                Level = int.Parse(item["level"].ToString()),
                HighScore = int.Parse(item["highScore"].ToString()),
                Sign = item["sign"].ToString(),
                Gold = int.Parse(item["gold"].ToString()),
                Rune = int.Parse(item["rune"].ToString()),
                Physical = int.Parse(item["physical"].ToString()),
                CheckPoint = int.Parse(item["checkPoint"].ToString()),//N_INFO 初始化关卡点
                Friends = item["friends"] as List<object>,
                CheckPointStars = item["checkPointStars"] as List<object>
            };
            userList.Add(u);
        }
    }
}


### 如何在 Unity 中解析和生成 JSON 数据 #### 使用 `JsonUtility` 进行简单对象的序列化与反序列化 对于简单的 JSON 序列化和反序列化操作,可以使用 Unity 自带的 `JsonUtility` 工具。为了使自定义的数据类能够被正确地转换成 JSON 字符串或从 JSON 字符串中读取,该类需要标记 `[System.Serializable]` 属性[^1]。 ```csharp using UnityEngine; [System.Serializable] public class PlayerData { public int health; public string name; } // 将 C# 对象转为 JSON 字符串 PlayerData player = new PlayerData {health = 100, name = "Hero"}; string jsonString = JsonUtility.ToJson(player); Debug.Log(jsonString); // 由 JSON 字符串恢复为 C# 对象 PlayerData loadedPlayer = JsonUtility.FromJson<PlayerData>(jsonString); Debug.Log(loadedPlayer.name + ": " + loadedPlayer.health); ``` 需要注意的是,`JsonUtility` 不支持复杂的嵌套结构以及某些特定类型的属性,这可能限制其应用场景[^3]。 #### 利用第三方库 LitJson 处理更灵活的情况 当遇到较为复杂的数据模型或是希望拥有更多功能时,则可以选择引入外部库如 LitJson 来完成任务。通过这种方式不仅可以轻松访问 JSON 数组中的元素还可以方便地遍历整个文档树形结构来获取所需的信息[^2]。 下面是一个利用 LitJson 实现异步加载并解析远程 JSON 文件的例子: ```csharp using LitJson; using System.Collections; using UnityEngine; using UnityEngine.Networking; IEnumerator LoadAndParseRemoteJson() { var uri = new System.Uri(Path.Combine(Application.streamingAssetsPath, "data.json")); using (UnityWebRequest request = UnityWebRequest.Get(uri)) { yield return request.SendWebRequest(); if (!request.isNetworkError && !request.isHttpError) { string jsonStr = request.downloadHandler.text; // 假设我们有一个根节点名为 RootObject 的类用于映射返回的结果 RootObject data = JsonMapper.ToObject<RootObject>(jsonStr); foreach(var item in data.items){ Debug.Log(item.ToString()); } } else { Debug.LogError($"Failed to load file: {request.error}"); } } } ``` 此方法允许开发者更加自由地控制如何构建应用程序内部使用的数据表示形式,并且提供了更好的错误处理机制[^4]。
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