Json的序列化和反序列化（一）

补充知识：

1.字符串转比特数组
 
(1)byte[] bt=System.Text.Encoding.Default.GetBytes("字符串");
 
(2)byte[] bt=Convert.FromBase64String("字符串");
 
2.字符串转流
 
(1)MemoryStream ms=new MemoryStream(System.Text.Encoding.Default.GetBytes("字符串"));
 
(2)MemoryStream ms=new MemoryStream(Convert.FromBase64String("字符串"));
 
3.流转比特数组
 
(1)byte[] bt=ms.ToArray();
 
(2)MemoryStream ms=new MemoryStream();ms.Write(bt,0,ms.Length);
 
4.流转字符串
 
(1)string str=Convert.ToBase64String(ms.ToArray());
 
(2)string str=System.Text.Encoding.Default.GetString(ms.ToArray());
 
5.比特数组转字符串
 
(1)string str=System.Text.Encoding.Default.GetString(bt);
 
(2)string str=Convert.ToBase64String(bt);
 
6.比特数组转流
 
(1)MemoryStream ms=new MemoryStream(bt);
 
(2)MemoryStream ms=new MemoryStream();ms.Read(bt,0,bt.Lenght);

 

 

1. 添加引用System.ServiceModel.Web

2. 创建类

   public class JsonHelper    {        // 序列化        public static  string JsonSerializer<T>(T t)        {            // 使用 DataContractJsonSerializer 将 T 对象序列化为内存流。             DataContractJsonSerializer jsonSerializer = new DataContractJsonSerializer(typeof (T));            MemoryStream ms = new MemoryStream();            // 使用 WriteObject 方法将 JSON 数据写入到流中。             jsonSerializer.WriteObject(ms, t);            // 流转字符串            string jsonString = Encoding.UTF8.GetString(ms.ToArray());            ms.Close();            //替换Json的Date字符串              string p = @"\\/Date\((\d+)\+\d+\)\\/";               MatchEvaluator matchEvaluator = new MatchEvaluator(ConvertJsonDateToDateString);              Regex reg = new Regex(p);               jsonString = reg.Replace(jsonString, matchEvaluator);            return jsonString;        }        public static T JsonDeserialize<T>(string  jsonString)        {            //将"yyyy-MM-dd HH:mm:ss"格式的字符串转为"\/Date(1294499956278+0800)\/"格式              string p = @"\d{4}-\d{2}-\d{2}\s\d{2}:\d{2}:\d{2}";               MatchEvaluator matchEvaluator = new MatchEvaluator(ConvertDateStringToJsonDate);               Regex reg = new Regex(p);              jsonString = reg.Replace(jsonString, matchEvaluator);            DataContractJsonSerializer jsonSerializer=new DataContractJsonSerializer(typeof(T));            // 字符串转流            MemoryStream ms=new MemoryStream(Encoding.UTF8.GetBytes(jsonString));            // 通过使用 DataContractJsonSerializer 的 ReadObject 方法，将 JSON 编码数据反序列化为T             T obj = (T) jsonSerializer.ReadObject(ms);            return obj;        }        public static string ConvertJsonDateToDateString(Match match)        {            string result = string.Empty;            DateTime dateTime=new DateTime(1970,1,1);            dateTime = dateTime.AddMilliseconds(long.Parse(match.Groups[1].Value));            dateTime = dateTime.ToLocalTime();            result = dateTime.ToString("yyyy-MM-dd HH:mm:ss");            return result;        }        private static string ConvertDateStringToJsonDate(Match m)        {            string result = string.Empty;               DateTime dt = DateTime.Parse(m.Groups[0].Value);             dt = dt.ToUniversalTime();               TimeSpan ts = dt - DateTime.Parse("1970-01-01");              result = string.Format("\\/Date({0}+0800)\\/",ts.TotalMilliseconds);               return result;           }    }    public class Person    {        public string Name { get; set; }        public int Age { get; set; }        public DateTime dateTime { get; set; }    }

 

3. 后台代码实现

 protected void Page_Load(object sender, EventArgs e)        {            // 序列化            Person p = new Person();            p.Name = "Bradley";            p.Age = 24;            p.dateTime = DateTime.Now;            string jsonString = JsonHelper.JsonSerializer<Person>(p);            Response.Write(jsonString);            Response.Write("</br>");            // 反序列化            string jsonString1 = "{\"Age\":28,\"Name\":\"张三\"}";                Person p1 = JsonHelper.JsonDeserialize<Person>(jsonString);            Response.Write(p1.Name+":"+p1.Age.ToString()+"Time:"+p.dateTime.ToString());            // 序列化字典            Dictionary<string,string> dictionary=new Dictionary<string, string>();            dictionary.Add("Name:","Bradley");            dictionary.Add("Age:","24");            string jsonString2 = JsonHelper.JsonSerializer<Dictionary<string, string>>(dictionary);            Response.Write("</br>");            Response.Write(jsonString2);        }