JSON解析类(C#)

技术2022-05-19 18

使用本文中的JSONConvert类可将任意JSON字符串转化为JSONObject或JSONArray对象，并获取需要的值，克服了.NET自带JSON类反序列化时需知道并引用序列化时使用的类的缺点。当然，也可以使用JSONConvert类进行序列化，构造出JSON字符串。

JSON解析类

using System;using System.Collections.Generic;using System.Text;using System.Text.RegularExpressions;

/// <summary> /// 类名：JSONConvert /// 描述：JSON解析类 /// 编写：wufeng /// 日期：2010-10-21 /// 版本：1.1.0 /// </summary> public static class JSONConvert { #region 全局变量

private static JSONObject _json = new JSONObject();//寄存器 private static readonly string _SEMICOLON = "@semicolon";//分号转义符 private static readonly string _COMMA = "@comma"; //逗号转义符

#endregion

#region 字符串转义 /// <summary> /// 字符串转义,将双引号内的:和,分别转成_SEMICOLON和_COMMA /// </summary> /// <param name="text"></param> /// <returns></returns> private static string StrEncode(string text) { MatchCollection matches = Regex.Matches(text, "//"[^//"]+///""); foreach (Match match in matches) { text = text.Replace(match.Value, match.Value.Replace(":", _SEMICOLON).Replace(",", _COMMA)); }

return text; }

/// <summary> /// 字符串转义,将_SEMICOLON和_COMMA分别转成:和, /// </summary> /// <param name="text"></param> /// <returns></returns> private static string StrDecode(string text) { return text.Replace(_SEMICOLON, ":").Replace(_COMMA, ","); }

#endregion

#region JSON最小单元解析

/// <summary> /// 最小对象转为JSONObject /// </summary> /// <param name="text"></param> /// <returns></returns> private static JSONObject DeserializeSingletonObject(string text) { JSONObject jsonObject = new JSONObject();

MatchCollection matches = Regex.Matches(text, "(//"(?<key>[^//"]+)//"://"(?<value>[^,//"]+)//")|(//"(?<key>[^//"]+)//":(?<value>[^,//"//}]+))"); foreach (Match match in matches) { string value = match.Groups["value"].Value; jsonObject.Add(match.Groups["key"].Value, _json.ContainsKey(value) ? _json[value] : StrDecode(value)); }

return jsonObject; }

/// <summary> /// 最小数组转为JSONArray /// </summary> /// <param name="text"></param> /// <returns></returns> private static JSONArray DeserializeSingletonArray(string text) { JSONArray jsonArray = new JSONArray();

MatchCollection matches = Regex.Matches(text, "(//"(?<value>[^,//"]+)")|(?<value>[^,//[//]]+)"); foreach (Match match in matches) { string value = match.Groups["value"].Value; jsonArray.Add(_json.ContainsKey(value) ? _json[value] : StrDecode(value)); }

return jsonArray; }

/// <summary> /// 反序列化 /// </summary> /// <param name="text"></param> /// <returns></returns> private static string Deserialize(string text) { text = StrEncode(text);//转义;和,

int count = 0; string key = string.Empty; string pattern = "(//{[^//[//]//{//}]+//})|(//[[^//[//]//{//}]+//])";

while (Regex.IsMatch(text, pattern)) { MatchCollection matches = Regex.Matches(text, pattern); foreach (Match match in matches) { key = "___key" + count + "___";

if (match.Value.Substring(0, 1) == "{") _json.Add(key, DeserializeSingletonObject(match.Value)); else _json.Add(key, DeserializeSingletonArray(match.Value));

text = text.Replace(match.Value, key);

count++; } } return text; }

#endregion

#region 公共接口

/// <summary> /// 序列化JSONObject对象 /// </summary> /// <param name="text"></param> /// <returns></returns> public static JSONObject DeserializeObject(string text) { return _json[Deserialize(text)] as JSONObject; }

/// <summary> /// 序列化JSONArray对象 /// </summary> /// <param name="text"></param> /// <returns></returns> public static JSONArray DeserializeArray(string text) { return _json[Deserialize(text)] as JSONArray; }

/// <summary> /// 反序列化JSONObject对象 /// </summary> /// <param name="jsonObject"></param> /// <returns></returns> public static string SerializeObject(JSONObject jsonObject) { StringBuilder sb = new StringBuilder(); sb.Append("{"); foreach (KeyValuePair<string, object> kvp in jsonObject) { if (kvp.Value is JSONObject) { sb.Append(string.Format(""{0}":{1},", kvp.Key, SerializeObject((JSONObject)kvp.Value))); } else if (kvp.Value is JSONArray) { sb.Append(string.Format(""{0}":{1},", kvp.Key, SerializeArray((JSONArray)kvp.Value))); } else if (kvp.Value is String) { sb.Append(string.Format(""{0}":"{1}",", kvp.Key, kvp.Value)); } else { sb.Append(string.Format(""{0}":"{1}",", kvp.Key, "")); } } if (sb.Length > 1) sb.Remove(sb.Length - 1, 1); sb.Append("}"); return sb.ToString(); }

/// <summary> /// 反序列化JSONArray对象 /// </summary> /// <param name="jsonArray"></param> /// <returns></returns> public static string SerializeArray(JSONArray jsonArray) { StringBuilder sb = new StringBuilder(); sb.Append("["); for (int i = 0; i < jsonArray.Count; i++) { if (jsonArray[i] is JSONObject) { sb.Append(string.Format("{0},", SerializeObject((JSONObject)jsonArray[i]))); } else if (jsonArray[i] is JSONArray) { sb.Append(string.Format("{0},", SerializeArray((JSONArray)jsonArray[i]))); } else if (jsonArray[i] is String) { sb.Append(string.Format(""{0}",", jsonArray[i])); } else { sb.Append(string.Format(""{0}",", "")); }

} if (sb.Length > 1) sb.Remove(sb.Length - 1, 1); sb.Append("]"); return sb.ToString(); } #endregion }

/// <summary> /// 类名：JSONObject /// 描述：JSON对象类 /// 编写：wufeng /// 日期：2010-10-21 /// 版本：1.1.0 /// 更新历史： /// 2010-10-21 继承Dictionary<TKey, TValue>代替this[] /// </summary> public class JSONObject : Dictionary<string, object> { }

/// <summary> /// 类名：JSONArray /// 描述：JSON数组类 /// 编写：wufeng /// 日期：2010-10-21 /// 版本：1.1.0 /// 更新历史： /// 2010-10-21 继承List<T>代替this[] /// </summary> public class JSONArray : List<object> { }

控制台调用示例 //序列化 JSONArray _array = new JSONArray(); _array.Add("1"); _array.Add("2"); _array.Add("3"); _array.Add("4"); JSONObject _object = new JSONObject();//新建json对象作为内嵌 _object.Add("oneKey", "one"); _object.Add("twoArray", _array);

JSONArray jsonArray = new JSONArray(); jsonArray.Add("2006"); jsonArray.Add("2007"); jsonArray.Add("2008"); jsonArray.Add("2009"); jsonArray.Add("2010");

JSONObject jsonObject = new JSONObject(); jsonObject.Add("domain", "mzwu.com"); jsonObject.Add("two", _object);//添加json对象 jsonObject.Add("years", jsonArray); Console.WriteLine("json序列化为字符串"); Console.WriteLine(JSONConvert.SerializeObject(jsonObject));//执行序列化

//反序列化 JSONObject json = JSONConvert.DeserializeObject("{"domain":"mzwu.com","two":{"oneKey":"one","twoArray":[1,2,3,4]},"years":[2006,2007,2008,2009,2010]}");//执行反序列化 if (json != null) { Console.WriteLine("将json结构的字符串反序列化为json对象并调用"); Console.WriteLine(json["domain"]); Console.WriteLine(((JSONObject)json["two"])["oneKey"]); Console.WriteLine(((JSONArray)((JSONObject)json["two"])["twoArray"])[0]); Console.WriteLine(((JSONArray)json["years"])[3]); }

Console.ReadLine();

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