Android OkHttp

第一次听说OkHttp是工作中,组长推荐用这个替代常用的HttpUrlConnection或者HttpClient.于是乎,我就浅阅了OkHttp的介绍,才发现又是Square的作品(工作中写的App所用到的Lib几乎全部被Square承包了).

要想深入理解OkHttp,那当然是读他的原文介绍.我这只是用通俗的语言对他做简单翻译~

OkHttp的好处:

1.通过Http/2和SPDY协议,支持对于同一个Host的所有请求共享一个Socket;

SPDY是一个好东西.是由Google推出的一套协议.意在提供Http请求的效率.他是Http的一个增强,而不是替代.

这里有SPDY的Wiki英文介绍和百度中文介绍.

2.如果不支持SPDY协议的话,会通过连接池的方式减少请求的延时;

3.使用Gzip减少下载包的大小;

4.会缓存Response,以避免请求重复发送.

使用:

compile ‘com.squareup.okhttp:okhttp:2.3.0‘

有了Android Studio,有了Gradle后,新添加一个Lib就如此简单.

当然,你也可以通过下载Jar导入到Project里面.

例子:

1. Get a URL

 1 package com.squareup.okhttp.guide;
 2
 3 import com.squareup.okhttp.OkHttpClient;
 4 import com.squareup.okhttp.Request;
 5 import com.squareup.okhttp.Response;
 6 import java.io.IOException;
 7
 8 public class GetExample {
 9   OkHttpClient client = new OkHttpClient();
10
11   String run(String url) throws IOException {
12     Request request = new Request.Builder()
13         .url(url)
14         .build();
15
16     Response response = client.newCall(request).execute();
17     return response.body().string();
18   }
19
20   public static void main(String[] args) throws IOException {
21     GetExample example = new GetExample();
22     String response = example.run("https://raw.github.com/square/okhttp/master/README.md");
23     System.out.println(response);
24   }
25 }

2. Post to a server

 1 package com.squareup.okhttp.guide;
 2
 3 import com.squareup.okhttp.MediaType;
 4 import com.squareup.okhttp.OkHttpClient;
 5 import com.squareup.okhttp.Request;
 6 import com.squareup.okhttp.RequestBody;
 7 import com.squareup.okhttp.Response;
 8 import java.io.IOException;
 9
10 public class PostExample {
11   public static final MediaType JSON
12       = MediaType.parse("application/json; charset=utf-8");
13
14   OkHttpClient client = new OkHttpClient();
15
16   String post(String url, String json) throws IOException {
17     RequestBody body = RequestBody.create(JSON, json);
18     Request request = new Request.Builder()
19         .url(url)
20         .post(body)
21         .build();
22     Response response = client.newCall(request).execute();
23     return response.body().string();
24   }
25
26   String bowlingJson(String player1, String player2) {
27     return "{‘winCondition‘:‘HIGH_SCORE‘,"
28         + "‘name‘:‘Bowling‘,"
29         + "‘round‘:4,"
30         + "‘lastSaved‘:1367702411696,"
31         + "‘dateStarted‘:1367702378785,"
32         + "‘players‘:["
33         + "{‘name‘:‘" + player1 + "‘,‘history‘:[10,8,6,7,8],‘color‘:-13388315,‘total‘:39},"
34         + "{‘name‘:‘" + player2 + "‘,‘history‘:[6,10,5,10,10],‘color‘:-48060,‘total‘:41}"
35         + "]}";
36   }
37
38   public static void main(String[] args) throws IOException {
39     PostExample example = new PostExample();
40     String json = example.bowlingJson("Jesse", "Jake");
41     String response = example.post("http://www.roundsapp.com/post", json);
42     System.out.println(response);
43   }
44 }