OkHttp–支持SPDY协议的高效HTTP库

Android为咱们提供了两种HTTP交互的方式： HttpURLConnection 和 Apache HTTP Client，虽然二者都支持HTTPS，流的上传和下载，配置超时，IPv6和链接池，已足够知足咱们各类HTTP请求的需求。但更高效的使用HTTP能够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全部请求
• 若是SPDY不可用，则经过链接池来减小请求延时
• 无缝的支持GZIP来减小数据流量
• 缓存响应数据来减小重复的网络请求

 

会从不少经常使用的链接问题中自动恢复。若是您的服务器配置了多个IP地址，当第一个IP链接失败的时候，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同样的API。若是您用了 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.

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(); } }

下面的代码经过Post发送数据到服务器:

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