华域联盟 .Net 浅析ASP.NET万能JSON解析器

浅析ASP.NET万能JSON解析器

概念介绍
还是先简单说说Json的一些例子吧。注意,以下概念是我自己定义的,可以参考.net里面的TYPE的模型设计
如果有争议,欢迎提出来探讨!

1.最简单:
{"total":0}
total就是值,值是数值,等于0

2. 复杂点
{"total":0,"data":{"377149574" : 1}}
total是值,data是对象,这个对象包含了"377149574"这个值,等于1

3. 最复杂
{"total":0,"data":{"377149574":[{"cid":"377149574"}]}}
total是值,data是对象,377149574是数组,这个数组包含了一些列的对象,例如{"cid":"377149574"}这个对象。

有了以上的概念,就可以设计出通用的json模型了。

万能JSON源码:

复制代码 代码如下:

using System;

using System.Collections.Generic;

using System.Text;

namespace Pixysoft.Json

{

    public class CommonJsonModelAnalyzer

    {

        protected string _GetKey(string rawjson)

        {

            if (string.IsNullOrEmpty(rawjson))

                return rawjson;

            rawjson = rawjson.Trim();

            string[] jsons = rawjson.Split(new char[] { ':' });

            if (jsons.Length < 2)

                return rawjson;

            return jsons[0].Replace("\"", "").Trim();

        }

        protected string _GetValue(string rawjson)

        {

            if (string.IsNullOrEmpty(rawjson))

                return rawjson;

            rawjson = rawjson.Trim();

            string[] jsons = rawjson.Split(new char[] { ':' }, StringSplitOptions.RemoveEmptyEntries);

            if (jsons.Length < 2)

                return rawjson;

            StringBuilder builder = new StringBuilder();

            for (int i = 1; i < jsons.Length; i++)

            {

                builder.Append(jsons[i]);

                builder.Append(":");

            }

            if (builder.Length > 0)

                builder.Remove(builder.Length - 1, 1);

            string value = builder.ToString();

            if (value.StartsWith("\""))

                value = value.Substring(1);

            if (value.EndsWith("\""))

                value = value.Substring(0, value.Length - 1);

            return value;

        }

        protected List<string> _GetCollection(string rawjson)

        {

            //[{},{}]
            List<string> list = new List<string>();

            if (string.IsNullOrEmpty(rawjson))

                return list;

            rawjson = rawjson.Trim();

            StringBuilder builder = new StringBuilder();

            int nestlevel = -1;

            int mnestlevel = -1;

            for (int i = 0; i < rawjson.Length; i++)

            {

                if (i == 0)

                    continue;

                else if (i == rawjson.Length - 1)

                    continue;

                char jsonchar = rawjson[i];

                if (jsonchar == '{')

                {

                    nestlevel++;

                }

                if (jsonchar == '}')

                {

                    nestlevel--;

                }

                if (jsonchar == '[')

                {

                    mnestlevel++;

                }

                if (jsonchar == ']')

                {

                    mnestlevel--;

                }

                if (jsonchar == ',' && nestlevel == -1 && mnestlevel == -1)

                {

                    list.Add(builder.ToString());

                    builder = new StringBuilder();

                }

                else

                {

                    builder.Append(jsonchar);

                }

            }

            if (builder.Length > 0)

                list.Add(builder.ToString());

            return list;

        }

    }

}

复制代码 代码如下:

using System;

using System.Collections.Generic;

using System.Text;

namespace Pixysoft.Json

{

    public class CommonJsonModel : CommonJsonModelAnalyzer

    {

        private string rawjson;

        private bool isValue = false;

        private bool isModel = false;

        private bool isCollection = false;

        internal CommonJsonModel(string rawjson)

        {

            this.rawjson = rawjson;

            if (string.IsNullOrEmpty(rawjson))

                throw new Exception("missing rawjson");

            rawjson = rawjson.Trim();

            if (rawjson.StartsWith("{"))

            {

                isModel = true;

            }

            else if (rawjson.StartsWith("["))

            {

                isCollection = true;

            }

            else

            {

                isValue = true;

            }

        }

        public string Rawjson

        {

            get { return rawjson; }

        }

        public bool IsValue()

        {

            return isValue;

        }

        public bool IsValue(string key)

        {

            if (!isModel)

                return false;

            if (string.IsNullOrEmpty(key))

                return false;

            foreach (string subjson in base._GetCollection(this.rawjson))

            {

                CommonJsonModel model = new CommonJsonModel(subjson);

                if (!model.IsValue())

                    continue;

                if (model.Key == key)

                {

                    CommonJsonModel submodel = new CommonJsonModel(model.Value);

                    return submodel.IsValue();

                }

            }

            return false;

        }

        public bool IsModel()

        {

            return isModel;

        }

        public bool IsModel(string key)

        {

            if (!isModel)

                return false;

            if (string.IsNullOrEmpty(key))

                return false;

            foreach (string subjson in base._GetCollection(this.rawjson))

            {

                CommonJsonModel model = new CommonJsonModel(subjson);

                if (!model.IsValue())

                    continue;

                if (model.Key == key)

                {

                    CommonJsonModel submodel = new CommonJsonModel(model.Value);

                    return submodel.IsModel();

                }

            }

            return false;

        }

        public bool IsCollection()

        {

            return isCollection;

        }

        public bool IsCollection(string key)

        {

            if (!isModel)

                return false;

            if (string.IsNullOrEmpty(key))

                return false;

            foreach (string subjson in base._GetCollection(this.rawjson))

            {

                CommonJsonModel model = new CommonJsonModel(subjson);

                if (!model.IsValue())

                    continue;

                if (model.Key == key)

                {

                    CommonJsonModel submodel = new CommonJsonModel(model.Value);

                    return submodel.IsCollection();

                }

            }

            return false;

        }

        /// <summary>
        /// 当模型是对象,返回拥有的key
        /// </summary>
        /// <returns></returns>
        public List<string> GetKeys()
        {
            if (!isModel)
                return null;
            List<string> list = new List<string>();
            foreach (string subjson in base._GetCollection(this.rawjson))
            {
                string key = new CommonJsonModel(subjson).Key;
                if (!string.IsNullOrEmpty(key))
                    list.Add(key);
            }
            return list;
        }
        /// <summary>
        /// 当模型是对象,key对应是值,则返回key对应的值
        /// </summary>
        /// <param name="key"></param>
        /// <returns></returns>
        public string GetValue(string key)
        {
            if (!isModel)
                return null;
            if (string.IsNullOrEmpty(key))
                return null;
            foreach (string subjson in base._GetCollection(this.rawjson))
            {
                CommonJsonModel model = new CommonJsonModel(subjson);
                if (!model.IsValue())
                    continue;
                if (model.Key == key)
                    return model.Value;
            }
            return null;
        }
        /// <summary>
        /// 模型是对象,key对应是对象,返回key对应的对象
        /// </summary>
        /// <param name="key"></param>
        /// <returns></returns>
        public CommonJsonModel GetModel(string key)
        {
            if (!isModel)
                return null;
            if (string.IsNullOrEmpty(key))
                return null;
            foreach (string subjson in base._GetCollection(this.rawjson))
            {
                CommonJsonModel model = new CommonJsonModel(subjson);
                if (!model.IsValue())
                    continue;
                if (model.Key == key)
                {
                    CommonJsonModel submodel = new CommonJsonModel(model.Value);
                    if (!submodel.IsModel())
                        return null;
                    else
                        return submodel;
                }
            }
            return null;
        }
        /// <summary>
        /// 模型是对象,key对应是集合,返回集合
        /// </summary>
        /// <param name="key"></param>
        /// <returns></returns>
        public CommonJsonModel GetCollection(string key)
        {
            if (!isModel)
                return null;
            if (string.IsNullOrEmpty(key))
                return null;
            foreach (string subjson in base._GetCollection(this.rawjson))
            {
                CommonJsonModel model = new CommonJsonModel(subjson);
                if (!model.IsValue())
                    continue;
                if (model.Key == key)
                {
                    CommonJsonModel submodel = new CommonJsonModel(model.Value);
                    if (!submodel.IsCollection())
                        return null;
                    else
                        return submodel;
                }
            }
            return null;
        }
        /// <summary>
        /// 模型是集合,返回自身
        /// </summary>
        /// <returns></returns>
        public List<CommonJsonModel> GetCollection()
        {
            List<CommonJsonModel> list = new List<CommonJsonModel>();
            if (IsValue())
                return list;
            foreach (string subjson in base._GetCollection(rawjson))
            {
                list.Add(new CommonJsonModel(subjson));
            }
            return list;
        }
 

        /// <summary>
        /// 当模型是值对象,返回key
        /// </summary>
        private string Key
        {
            get
            {
                if (IsValue())
                    return base._GetKey(rawjson);
                return null;
            }
        }
        /// <summary>
        /// 当模型是值对象,返回value
        /// </summary>
        private string Value
        {
            get
            {
                if (!IsValue())
                    return null;
                return base._GetValue(rawjson);
            }
        }
    }
}

使用方法

public CommonJsonModel DeSerialize(string json)
{
 return new CommonJsonModel(json);
}

超级简单,只要new一个通用对象,把json字符串放进去就行了。

针对上文的3个例子,我给出3种使用方法:

{"total":0}
CommonJsonModel model = DeSerialize(json);
model.GetValue("total") // return 0
{"total":0,"data":{"377149574" : 1}}
CommonJsonModel model = DeSerialize(json);
model.GetModel("data").GetValue("377149574") //return 1
{"total":0,"data":{"377149574":[{"cid":"377149574"}]}}
CommonJsonModel model = DeSerialize(json);
model.GetCollection("377149574").GetCollection()[0].GetValue("cid") //return 377149574

这个有点点复杂,

1. 首先377149574代表了一个集合,所以要用model.GetCollection("377149574")把这个集合取出来。

2. 其次这个集合里面包含了很多对象,因此用GetColllection()把这些对象取出来

3. 在这些对象List里面取第一个[0],表示取了":{"cid":"377149574"}这个对象,然后再用GetValue("cid")把对象的值取出来。

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本文由 华域联盟 原创撰写:华域联盟 » 浅析ASP.NET万能JSON解析器

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作者: sterben

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