Jil序列化JSON

使用Jil序列化JSON提升Asp.net web api 性能

JSON序列化无疑是Asp.net web api 里面性能提升最重要的一环。

在Asp.net web api 里面我们可以插入自定义的MediaTypeFormatter(媒体格式化器)，

说白了就是根据HTTP content-type application/json

来判断采用哪种媒体格式化器



具体实现，记得要引入Jil包

public class JilFormatter : MediaTypeFormatter
{
private readonly Options _jilOptions;
private MethodInfo _method;

public JilFormatter()
{
//要序列化的时间格式
_jilOptions = new Options(dateFormat: DateTimeFormat.ISO8601);
//媒体类型
SupportedMediaTypes.Add(new MediaTypeHeaderValue("application/json"));
//加入 UTF8Encoding 编码
SupportedEncodings.Add(new UTF8Encoding(encoderShouldEmitUTF8Identifier: false, throwOnInvalidBytes: true));
//加入 UnicodeEncoding 编码
SupportedEncodings.Add(new UnicodeEncoding(bigEndian: false, byteOrderMark: true, throwOnInvalidBytes: true));

}
//判断是否反序列化类型
public override bool CanReadType(Type type)
{
if (type == null)
{
throw new ArgumentNullException("type");
}
return true;
}
//判断是否序列化类型
public override bool CanWriteType(Type type)
{
if (type == null)
{
throw new ArgumentNullException("type");
}
return true;
}

//  异步反序列化一个指定类型的对象。
public override Task<object> ReadFromStreamAsync(Type type, Stream readStream, System.Net.Http.HttpContent content, IFormatterLogger formatterLogger)
{
return Task.FromResult(DeserializeFromStream(type, readStream));
}

private object DeserializeFromStream(Type type, Stream readStream)
{
try
{
using (var reader = new StreamReader(readStream))
{
return JSON.Deserialize(reader, type, _jilOptions);
}
}
catch
{
return null;
}
}

//  异步序列化一个指定类型的对象。
public override Task WriteToStreamAsync(Type type, object value, Stream writeStream, System.Net.Http.HttpContent content, TransportContext transportContext)
{
var streamWriter = new StreamWriter(writeStream);
JSON.Serialize(value, streamWriter, _jilOptions);
streamWriter.Flush();
return Task.FromResult(writeStream);
}
}

加入到媒体格式化器集合中

public static void Register(HttpConfiguration config)
{
// Web API 配置和服务

// Web API 路由
config.MapHttpAttributeRoutes();

config.Routes.MapHttpRoute(
name: "DefaultApi",
routeTemplate: "api/{controller}/{id}",
defaults: new { id = RouteParameter.Optional }

);

GlobalConfiguration.Configuration.Formatters[0] = new JilFormatter();
}
}

控制类

public class HomeController : ApiController
{
public static   List<Market> Markets = new List<Market>();

public HomeController()
{

}

static HomeController()
{
Markets.Add(new Market { Id = 1, Name = "1", DateTimeNow = DateTime.Now });
Markets.Add(new Market { Id = 2, Name = "1", DateTimeNow = DateTime.Now });
Markets.Add(new Market { Id = 3, Name = "1", DateTimeNow = DateTime.Now });
Markets.Add(new Market { Id = 4, Name = "1", DateTimeNow = DateTime.Now });
Markets.Add(new Market { Id = 5, Name = "1", DateTimeNow = DateTime.Now });
}
public IEnumerable<Market> Get()
{
return Markets;
}
public HttpResponseMessage Post([FromBody]Market value)
{
Markets.Add(value);
return new HttpResponseMessage(HttpStatusCode.OK);
}

public HttpResponseMessage Put(int id, [FromBody]Market value)
{
var market = Markets.Where(x => x.Id == id).FirstOrDefault();
if (market == null)
return new HttpResponseMessage(HttpStatusCode.NotFound);

market.Name = value.Name;
return new HttpResponseMessage(HttpStatusCode.OK);
}

public HttpResponseMessage Delete(int id)
{
var result = Markets.Remove(Markets.Where(x => x.Id == id).FirstOrDefault());
return result
? new HttpResponseMessage(HttpStatusCode.Accepted)
: new HttpResponseMessage(HttpStatusCode.NotFound);
}
}

我们通过postman访问



我们在post一个实体



我们在get一下





已经可以看见刚才post的实体了。

源码：http://pan.baidu.com/s/1i3o6KD3

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