OkHttp的基本使用——替代Apache HttpClient

http是现在主流应用使用的网络请求方式, 用来交换数据和内容, 有效的使用HTTP可以使你的APP 变的更快和减少流量的使用

OkHttp 是一个很棒HTTP客户端:

支持SPDY, 可以合并多个到同一个主机的请求
使用连接池技术减少请求的延迟(如果SPDY是可用的话)
使用GZIP压缩减少传输的数据量
缓存响应避免重复的网络请求

OkHttp可以替换Apache的HttpClient

OkHttp支持2.3和以上版本，对于java，需要jdk1.7 ，OkHttp需要依赖Okio包

下面上demo

1：使用get方式请求，获取响应

import java.io.IOException;
import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.Response;

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

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

try (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：使用post向服务器发送请求

import java.io.IOException;
import okhttp3.MediaType;
import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.RequestBody;
import okhttp3.Response;

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();
try (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);
}
}