WebAPI性能优化之压缩解压

有时候为了提升WebAPI的性能，减少响应时间，我们会使用压缩和解压，而此刻大大都客户端浏览器都供给了内置的解压撑持。在WebAPI请求的资源越大时，使用压缩对性能提升的效果越明显，而当请求的资源很小时则不需要使用压缩和解压，因为压缩和解压同样也是需要耗费必然的时间的。

看见老外写了一篇ASP.NET Web API GZip compression ActionFilter with 8 lines of code

说实话被这标题吸引了，8行代码实现GZip压缩过滤器，我就照着他的去实践了一番，发明居然中文呈现乱码。

凭据他的实现方法：

1、下载DotNetZipLib库

2、解压后添加Ionic.Zlib.dll的dll引用

3、新建DeflateCompression特性和GZipCompression特性，分袂代表Deflate压缩和GZip压缩，这两种压缩方法的实现代码很相似

差此外处所就是

actContext.Response.Content.Headers.Add("Content-encoding", "gzip");

actContext.Response.Content.Headers.Add("Content-encoding", "deflate");

和

var compressor = new DeflateStream( output, CompressionMode.Compress, CompressionLevel.BestSpeed) var compressor = new GZipStream( output, CompressionMode.Compress, CompressionLevel.BestSpeed)

using System.Net.Http; using System.Web.Http.Filters; namespace WebAPI.Filter { public class GZipCompressionAttribute : ActionFilterAttribute { public override void OnActionExecuted(HttpActionExecutedContext actContext) { var content = actContext.Response.Content; var bytes = content == null ? null : content.ReadAsByteArrayAsync().Result; var zlibbedContent = bytes == null ? new byte[0] : CompressionHelper.GZipByte(bytes); actContext.Response.Content = new ByteArrayContent(zlibbedContent); actContext.Response.Content.Headers.Remove("Content-Type"); actContext.Response.Content.Headers.Add("Content-encoding", "gzip"); actContext.Response.Content.Headers.Add("Content-Type", "application/json"); base.OnActionExecuted(actContext); } } } using System.Net.Http; using System.Web.Http.Filters; namespace WebAPI.Filter { public class DeflateCompressionAttribute : ActionFilterAttribute { public override void OnActionExecuted(HttpActionExecutedContext actContext) { var content = actContext.Response.Content; var bytes = content == null ? null : content.ReadAsByteArrayAsync().Result; var zlibbedContent = bytes == null ? new byte[0] : CompressionHelper.DeflateByte(bytes); actContext.Response.Content = new ByteArrayContent(zlibbedContent); actContext.Response.Content.Headers.Remove("Content-Type"); actContext.Response.Content.Headers.Add("Content-encoding", "deflate"); actContext.Response.Content.Headers.Add("Content-Type", "application/json"); base.OnActionExecuted(actContext); } }

4、添加一个压缩辅佐类CompressionHelper

using System.IO; using Ionic.Zlib; namespace WebAPI.Filter { public class CompressionHelper { public static byte[] DeflateByte(byte[] str) { if (str == null) { return null; } using (var output = new MemoryStream()) { using ( var compressor = new DeflateStream( output, CompressionMode.Compress, CompressionLevel.BestSpeed)) { compressor.Write(str, 0, str.Length); } return output.ToArray(); } } public static byte[] GZipByte(byte[] str) { if (str == null) { return null; } using (var output = new MemoryStream()) { using ( var compressor = new GZipStream( output, CompressionMode.Compress, CompressionLevel.BestSpeed)) { compressor.Write(str, 0, str.Length); } return output.ToArray(); } } } }

5、控制器挪用，这里我写的测试代码：

public class TestController : ApiController { StringBuilder sb = new StringBuilder(); [GZipCompression] public string Get(int id) { for (int i = 0; i < 1000;i++ ) { sb.Append("这里是中国的领土" + i); } return sb.ToString() + DateTime.Now.ToLocalTime() + "," + id; } }

先看下不使用压缩，注释//[GZipCompression] 符号，文件巨细是26.4kb，请求时间是1.27s