OkHttp–支持SPDY协议的高效HTTP库

Android为我们提供了两种HTTP交互的方式： HttpURLConnection 和 Apache HTTP Client，虽然两者都支持HTTPS，流的上传和下载，配置超时，IPv6和连接池，已足够满足我们各种HTTP请求的需求。但更高效的使用HTTP可以让您的应用运行更快、更节省流量。而OkHttp库就是为此而生。

OkHttp是一个高效的HTTP库:

• 支持 SPDY ，共享同一个Socket来处理同一个服务器的所有请求
• 如果SPDY不可用，则通过连接池来减少请求延时
• 无缝的支持GZIP来减少数据流量
• 缓存响应数据来减少重复的网络请求

会从很多常用的连接问题中自动恢复。如果您的服务器配置了多个IP地址，当第一个IP连接失败的时候，OkHttp会自动尝试下一个IP。OkHttp还处理了代理服务器问题和SSL握手失败问题。

使用 OkHttp 无需重写您程序中的网络代码。OkHttp实现了几乎和java.net.HttpURLConnection一样的API。如果您用了 Apache HttpClient，则OkHttp也提供了一个对应的okhttp-apache 模块。

Examples

下面的示例请求一个URL并答应出返回内容字符.

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package   com . squareup . okhttp . guide ;   import   com . squareup . okhttp . OkHttpClient ; import   java . io . ByteArrayOutputStream ; import   java . io . IOException ; import   java . io . InputStream ; import   java . net . HttpURLConnection ; import   java . net . URL ;   public   class   GetExample   {    OkHttpClient  client   =   new   OkHttpClient ( ) ;      void   run ( )   throws   IOException   {      String   result   =   get ( new   URL ( "https://raw.github.com/square/okhttp/master/README.md" ) ) ;      System . out . println ( result ) ;    }      String   get ( URL  url )   throws   IOException   {      HttpURLConnection  connection   =   client . open ( url ) ;      InputStream  in   =   null ;      try   {        // Read the response.        in   =   connection . getInputStream ( ) ;        byte [ ]   response   =   readFully ( in ) ;        return   new   String ( response ,   "UTF-8" ) ;      }   finally   {        if   ( in   !=   null )   in . close ( ) ;      }    }      byte [ ]   readFully ( InputStream  in )   throws   IOException   {      ByteArrayOutputStream  out   =   new   ByteArrayOutputStream ( ) ;      byte [ ]   buffer   =   new   byte [ 1024 ] ;      for   ( int   count ;   ( count   =   in . read ( buffer ) )   !=   - 1 ;   )   {        out . write ( buffer ,   0 ,   count ) ;      }      return   out . toByteArray ( ) ;    }      public   static   void   main ( String [ ]   args )   throws   IOException   {      new   GetExample ( ) . run ( ) ;    } }

下面的代码通过Post发送数据到服务器:

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package   com . squareup . okhttp . guide ;   import   com . squareup . okhttp . OkHttpClient ; import   java . io . BufferedReader ; import   java . io . IOException ; import   java . io . InputStream ; import   java . io . InputStreamReader ; import   java . io . OutputStream ; import   java . net . HttpURLConnection ; import   java . net . URL ;   public   class   PostExample   {    OkHttpClient  client   =   new   OkHttpClient ( ) ;      void   run ( )   throws   IOException   {      byte [ ]   body   =   bowlingJson ( "Jesse" ,   "Jake" ) . getBytes ( "UTF-8" ) ;      String   result   =   post ( new   URL ( "http://www.roundsapp.com/post" ) ,   body ) ;      System . out . println ( result ) ;    }      String   post ( URL  url ,   byte [ ]   body )   throws   IOException   {      HttpURLConnection  connection   =   client . open ( url ) ;      OutputStream  out   =   null ;      InputStream  in   =   null ;      try   {        // Write the request.        connection . setRequestMethod ( "POST" ) ;        out   =   connection . getOutputStream ( ) ;        out . write ( body ) ;        out . close ( ) ;          // Read the response.        if   ( connection . getResponseCode ( )   !=   HttpURLConnection . HTTP_OK )   {          throw   new   IOException ( "Unexpected HTTP response: "              +   connection . getResponseCode ( )   +   " "   +   connection . getResponseMessage ( ) ) ;        }        in   =   connection . getInputStream ( ) ;        return   readFirstLine ( in ) ;      }   finally   {        // Clean up.        if   ( out   !=   null )   out . close ( ) ;        if   ( in   !=   null )   in . close ( ) ;      }    }      String   readFirstLine ( InputStream  in )   throws   IOException   {      BufferedReader  reader   =   new   BufferedReader ( new   InputStreamReader ( in ,   "UTF-8" ) ) ;      return   reader . readLine ( ) ;    }      String   bowlingJson ( String   player1 ,   String   player2 )   {      return   "{'winCondition':'HIGH_SCORE',"          +   "'name':'Bowling',"          +   "'round':4,"          +   "'lastSaved':1367702411696,"          +   "'dateStarted':1367702378785,"          +   "'players':["          +   "{'name':'"   +   player1   +   "','history':[10,8,6,7,8],'color':-13388315,'total':39},"          +   "{'name':'"   +   player2   +   "','history':[6,10,5,10,10],'color':-48060,'total':41}"          +   "]}" ;    }      public   static   void   main ( String [ ]   args )   throws   IOException   {      new   PostExample ( ) . run ( ) ;    } }

 

 

参考：

http://square.github.io/okhttp/

http://android-developers.blogspot.com/2011/09/androids-http-clients.html

 

转自：http://liuzhichao.com/p/1707.html