Unity几个Json库的序列化简单比较

粗略需求是对比Unity自带的JsonUtility、Newtonsoft、LitJson、SimpleJson这几个库在序列化统一对象时的时间消耗

要序列化的对象类定义

[Serializable]
public class ToSerializeObject
{
    public int logtype;

    public long userid;

    public string platform;

    public string clientversion;

    public string message;

    public string title;
}

比较代码

    public class JsonTest : MonoBehaviour
    {
        private readonly StringBuilder _stringBuilder1 = new StringBuilder();
        private readonly StringBuilder _stringBuilder2 = new StringBuilder();
        private readonly StringBuilder _stringBuilder3 = new StringBuilder();
        private readonly StringBuilder _stringBuilder4 = new StringBuilder();
        private const int TestCount = 100000;
        
        private readonly Stopwatch _stopwatch = new Stopwatch();
    
        // Start is called before the first frame update
        void Start()
        {
            ClearCache();
            
            Debug.Log("Newtonsoft ============================");
            
            _stopwatch.Start();
            NewtonsoftJsonTest();
            _stopwatch.Stop();
            Debug.Log($"Json of Newtonsoft = {_stopwatch.ElapsedMilliseconds}");
        
            Debug.Log("Unity ============================");
            _stopwatch.Reset();
            _stopwatch.Restart();
            UnityJsonTest();
            _stopwatch.Stop();
            Debug.Log($"Json of Unity = {_stopwatch.ElapsedMilliseconds}");
            
            Debug.Log("SimpleJson ============================");
            _stopwatch.Reset();
            _stopwatch.Restart();
            SimpleJsonTest();
            _stopwatch.Stop();
            Debug.Log($"Json of SimpleJson = {_stopwatch.ElapsedMilliseconds}");
            
            Debug.Log("LitJson ============================");
            _stopwatch.Reset();
            _stopwatch.Restart();
            LitJsonTest();
            _stopwatch.Stop();
            Debug.Log($"Json of LitJson = {_stopwatch.ElapsedMilliseconds}");

        }

        /// <summary>
        /// Newtonsoft的json序列化测试
        /// </summary>
        private void NewtonsoftJsonTest()
        {
            Profiler.BeginSample("Newtonsoft");
            
            for (var i = 0; i < TestCount; i++)
            {
                var obj = new ToSerializeObject()
                {
                    clientversion = $"client{i + 1}",
                    logtype = 1,
                    message = $"message {i + 1}",
                    platform = "android",
                    title = $"title {i + 1}",
                    userid = 1000 + i
                };
                
                _stringBuilder1.Append(JsonConvert.SerializeObject(obj));
                _stringBuilder1.Append("#@#");
            }
            
            Profiler.EndSample();

            Debug.Log($"message1 length = {_stringBuilder1.Length}, data = {_stringBuilder1.ToString()}");
        }

        /// <summary>
        /// Unity自带json库的json序列化测试
        /// </summary>
        private void UnityJsonTest()
        {
            Profiler.BeginSample("Unity");
            
            for (var i = 0; i < TestCount; i++)
            {
                var obj = new ToSerializeObject()
                {
                    clientversion = $"client{i + 1}",
                    logtype = 1,
                    message = $"message {i + 1}",
                    platform = "android",
                    title = $"title {i + 1}",
                    userid = 1000 + i
                };
                
                _stringBuilder2.Append(JsonUtility.ToJson(obj));
                _stringBuilder2.Append("#@#");
            }
            
            Profiler.EndSample();
            
            Debug.Log($"message2 length = {_stringBuilder2.Length}, data = {_stringBuilder2.ToString()}");
            
        }

        /// <summary>
        /// SimpleJson的json序列化测试
        /// </summary>
        private void SimpleJsonTest()
        {
            Profiler.BeginSample("SimpleJSON");

            var jsonClass = new JSONClass();
            for (var i = 0; i < TestCount; i++)
            {
                var obj = new ToSerializeObject()
                {
                    clientversion = $"client{i + 1}",
                    logtype = 1,
                    message = $"message {i + 1}",
                    platform = "android",
                    title = $"title {i + 1}",
                    userid = 1000 + i
                };
                
                jsonClass.Add("clientversion", new JSONData(obj.clientversion));
                jsonClass.Add("logtype", new JSONData(obj.logtype));
                jsonClass.Add("message", new JSONData(obj.message));
                jsonClass.Add("platform", new JSONData(obj.platform));
                jsonClass.Add("title", new JSONData(obj.title));
                jsonClass.Add("userid", new JSONData(obj.userid));
                _stringBuilder3.Append(jsonClass.ToString());
                _stringBuilder3.Append("#@#");
            }
            
            Profiler.EndSample();
            
            Debug.Log($"message2 length = {_stringBuilder3.Length}, data = {_stringBuilder3.ToString()}");
        }

        /// <summary>
        /// LitJson的json序列化测试
        /// </summary>
        private void LitJsonTest()
        {
            Profiler.BeginSample("LitJson");
            
            for (var i = 0; i < TestCount; i++)
            {
                var obj = new ToSerializeObject()
                {
                    clientversion = $"client{i + 1}",
                    logtype = 1,
                    message = $"message {i + 1}",
                    platform = "android",
                    title = $"title {i + 1}",
                    userid = 1000 + i
                };
                
                _stringBuilder4.Append(JsonMapper.ToJson(obj));
                _stringBuilder4.Append("#@#");
            }
            
            Profiler.EndSample();
            
            Debug.Log($"message2 length = {_stringBuilder4.Length}, data = {_stringBuilder4.ToString()}");
        }

        private void ClearCache()
        {
            _stringBuilder1.Clear();
            _stringBuilder2.Clear();
            _stringBuilder3.Clear();
            _stringBuilder4.Clear();
        }

3.结果

image.png

4.GC等
特意也看了下GC的消耗，利用unity的Profile
在执行10000次的情况下的消耗

image.png

这里只是略微的比较了在序列化自定义对象的时候几种库的表现，目前能看到的是unity自带的库表现的是最好的，当然，不排除有使用的不正确的情况导致的情况。这个数据只有在实际这么使用的时候，才具有价值，其他情况下只做参考。

注：另外看了一个对json字符串解析的性能比较，参考（https://segmentfault.com/a/1190000019731298?utm_source=tag-newest
），这里json解析表现最好的是SimpleJson。