JsonFiler.cs

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using System;using System.IO;using System.Linq;using System.Text;using LitJson;namespace Common{    public static class JsonFiler    {        #region 公共变量        public static string Path { get; set; }        #endregion        #region 私有常量        const string SectionName = "section";        const string KeyName = "key";        const string ValueName = "value";        #endregion        #region 私有结构        struct KeyData        {            public string Section;            public string Key;            public string Value;        }        #endregion        #region 公共函数        public static void Write(string section, string key, string value)        {            var jsonData = new JsonData();            jsonData[SectionName] = section;            jsonData[KeyName] = key;            jsonData[ValueName] = value;            saveJsonData(section, key, jsonData, Path);        }        public static string Read(string sectionName, string keyName)        {            var fs = getFile(Path);            var sr = new StreamReader(fs);            var value = string.Empty;            var k = new KeyData();            while (!sr.EndOfStream)            {                k = getKeyData(sr.ReadLine());                if (!k.Section.Equals(sectionName) || !k.Key.Equals(keyName)) continue;                value = k.Value;                break;            }            fs.Close();            return value;        }        #endregion        #region 私有函数        static FileStream getFile(string filePath, FileMode mode = FileMode.Open)        {            var path = filePath.Substring(0, filePath.LastIndexOf("/", StringComparison.Ordinal));            if (!Directory.Exists(path)) Directory.CreateDirectory(path);            var file = !File.Exists(filePath) ? new FileStream(filePath, FileMode.Create) : new FileStream(filePath, mode);            return file;        }        static KeyData getKeyData(string source)        {            source = source.Trim('{', '}');            source = source.Replace("\"", string.Empty);            var k = new KeyData();            var debris = source.Split(',');            foreach (var split in debris.Select(t => t.Split(':')))            {                switch (split[0])                {                    case SectionName:                        k.Section = split[1];                        break;                    case KeyName:                        k.Key = split[1];                        break;                    case ValueName:                        k.Value = split[1];                        break;                }            }            return k;        }        static void saveJsonData(string sectionName, string keyName, JsonData jsonData, string filePath, FileMode mode = FileMode.Create)        {            var dirPath = filePath.Substring(0, filePath.LastIndexOf("/", StringComparison.Ordinal));            if (!Directory.Exists(dirPath)) Directory.CreateDirectory(dirPath);            if (File.Exists(filePath))            {//文件存在则搜索指定名称json数据串并写入                //删除匹配section和key的项                var lines = File.ReadAllLines(filePath).ToList();                foreach (var line in from l in lines let k = getKeyData(l) where k.Section.Equals(sectionName) && k.Key.Equals(keyName) select l)                {                    lines.Remove(line);                    break;                }                //添加新json串                var jsonLine = jsonData.ToJson();                lines.Add(jsonLine);                //保存文件                var fs = new FileStream(filePath, mode);                var sb = new StringBuilder();                foreach (var line in lines) sb.Append(line + "\r\n");//拷贝至可变字符串                var buff = Encoding.UTF8.GetBytes(sb.ToString());//转换为字节数据                fs.Write(buff, 0, buff.Length);                fs.Close();            }            else            {//文件不存在则新建并保存                var fs = new FileStream(filePath, FileMode.Create);                var str = jsonData.ToJson() + "\r\n";                var buff = Encoding.UTF8.GetBytes(str);                fs.Write(buff, 0, buff.Length);                fs.Close();            }        }        #endregion    }}
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