https://square.github.io/okhttp/?square.github.iosquare/okhttp?github.com

0 概述

okhttp是一個現代的網絡請求框架

• Http/2 支持 所有訪問同一個主機的Request都共用一個socket
• connection pool 連接池 減少請求延遲
• GZIP 壓縮數據，減少傳輸所用的帶寬
• Response Cache 避免重復性的Request

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1 使用

Get

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();} }

Post

public static final MediaType JSON= MediaType.get("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();} }

Async

private final OkHttpClient client = new OkHttpClient();public void run() throws Exception {Request request = new Request.Builder().url("http://publicobject.com/helloworld.txt").build();client.newCall(request).enqueue(new Callback() {@Override public void onFailure(Call call, IOException e) {e.printStackTrace();}@Override public void onResponse(Call call, Response response) throws IOException {try (ResponseBody responseBody = response.body()) {if (!response.isSuccessful()) throw new IOException("Unexpected code " + response);Headers responseHeaders = response.headers();for (int i = 0, size = responseHeaders.size(); i < size; i++) {System.out.println(responseHeaders.name(i) + ": " + responseHeaders.value(i));}System.out.println(responseBody.string());}}});}

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2 源碼

2.0 請求過程

2.1 OkHttpClient

• dispatcher
• interceptors
• networkInterceptors
• connectionPool
• proxy
• newCall()

2.2 Call

• Response execute()
• enqueue(Callback responseCallback)

2.3 Request

• url
• method
• headers
• body
• tag
• cacheControl

2.4 Response

• request
• protocol
• code
• message
• headers
• body
• handshake

2.5 RealInterceptorChain

• interceptors
• transmitter
• index
• request
• call
• exchange

2.6 Interceptor

• Response intercept(Chain chain)

2.7 Cache

• DiskLruCache cache;

2.8 Connection

• Route route();
• Socket socket();
• Handshake handshake();
• Protocol protocol();
• connectSocket
• source
• sink
• connectionPool

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3 架構

• 中間層
  • OKhttp 通過很多中間攔截器來對 Request Response 進行加工
  • 實現了數據的 流式鏈式處理
• 生產者
• 分發器
  • 調度器 通過不同狀態的 任務隊列 來調度任務
  • readyCalls runningCalls

• 消費者
• 緩存
• 攔截器
  • 類似責任鏈的效果，鏈式處理，鏈式返回

總結

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