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.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 | 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:
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 | 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
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