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.意在提高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

package com.squareup.okhttp.guide;

import com.squareup.okhttp.OkHttpClient;
import com.squareup.okhttp.Request;
import com.squareup.okhttp.Response;
import java.io.IOException;

public class GetExample {
  OkHttpClient client = new OkHttpClient();

  String run(String url) throws IOException {
    Request request = new Request.Builder()
        .url(url)
        .build();

    Response response = client.newCall(request).execute();
    return response.body().string();
  }

  public static void main(String[] args) throws IOException {
    GetExample example = new GetExample();
    String response = example.run("https://raw.github.com/square/okhttp/master/README.md");
    System.out.println(response);
  }
}

2. Post to a server

package com.squareup.okhttp.guide;

import com.squareup.okhttp.MediaType;
import com.squareup.okhttp.OkHttpClient;
import com.squareup.okhttp.Request;
import com.squareup.okhttp.RequestBody;
import com.squareup.okhttp.Response;
import java.io.IOException;

public class PostExample {
  public static final MediaType JSON
      = MediaType.parse("application/json; charset=utf-8");

  OkHttpClient client = new OkHttpClient();

  String post(String url, String json) throws IOException {
    RequestBody body = RequestBody.create(JSON, json);
    Request request = new Request.Builder()
        .url(url)
        .post(body)
        .build();
    Response response = client.newCall(request).execute();
    return response.body().string();
  }

  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 {
    PostExample example = new PostExample();
    String json = example.bowlingJson("Jesse", "Jake");
    String response = example.post("http://www.roundsapp.com/post", json);
    System.out.println(response);
  }
}