OkHttp使用教程(5)_H5之家 - 中国HTML5教程资源分享第一站

超时
没有响应时使用超时结束call。没有响应的原因可能是客户点链接问题、服务器可用性问题或者这之间的其他东西。OkHttp支持连接，读取和写入超时。

private final OkHttpClient client; public ConfigureTimeouts() throws Exception { client = new OkHttpClient(); client.setConnectTimeout(10, TimeUnit.SECONDS); client.setWriteTimeout(10, TimeUnit.SECONDS); client.setReadTimeout(30, TimeUnit.SECONDS); } public void run() throws Exception { Request request = new Request.Builder() .url("http://httpbin.org/delay/2") // This URL is served with a 2 second delay. .build(); Response response = client.newCall(request).execute(); System.out.println("Response completed: " + response); }

每个call的配置
使用OkHttpClient，所有的HTTP Client配置包括代理设置、超时设置、缓存设置。当你需要为单个call改变配置的时候，clone 一个OkHttpClient。这个api将会返回一个浅拷贝（shallow copy），你可以用来单独自定义。下面的例子中，我们让一个请求是500ms的超时、另一个是3000ms的超时。

private final OkHttpClient client = new OkHttpClient(); public void run() throws Exception { Request request = new Request.Builder() .url("http://httpbin.org/delay/1") // This URL is served with a 1 second delay. .build(); try { Response response = client.clone() // Clone to make a customized OkHttp for this request. .setReadTimeout(500, TimeUnit.MILLISECONDS) .newCall(request) .execute(); System.out.println("Response 1 succeeded: " + response); } catch (IOException e) { System.out.println("Response 1 failed: " + e); } try { Response response = client.clone() // Clone to make a customized OkHttp for this request. .setReadTimeout(3000, TimeUnit.MILLISECONDS) .newCall(request) .execute(); System.out.println("Response 2 succeeded: " + response); } catch (IOException e) { System.out.println("Response 2 failed: " + e); } }

处理验证
这部分和HTTP AUTH有关。
相关资料： HTTP AUTH 那些事 - 王绍全的博客 - 博客频道 - CSDN.NET

OkHttp会自动重试未验证的请求。当响应是401 Not Authorized时，Authenticator会被要求提供证书。Authenticator的实现中需要建立一个新的包含证书的请求。如果没有证书可用，返回null来跳过尝试。

public List<Challenge> challenges() Returns the authorization challenges appropriate for this response's code. If the response code is 401 unauthorized, this returns the "WWW-Authenticate" challenges. If the response code is 407 proxy unauthorized, this returns the "Proxy-Authenticate" challenges. Otherwise this returns an empty list of challenges.

当需要实现一个Basic challenge，使用Credentials.basic(username, password)来编码请求头。

private final OkHttpClient client = new OkHttpClient(); public void run() throws Exception { client.setAuthenticator(new Authenticator() { @Override public Request authenticate(Proxy proxy, Response response) { System.out.println("Authenticating for response: " + response); System.out.println("Challenges: " + response.challenges()); String credential = Credentials.basic("jesse", "password1"); return response.request().newBuilder() .header("Authorization", credential) .build(); } @Override public Request authenticateProxy(Proxy proxy, Response response) { return null; // Null indicates no attempt to authenticate. } }); Request request = new Request.Builder() .url("http://publicobject.com/secrets/hellosecret.txt") .build(); Response response = client.newCall(request).execute(); if (!response.isSuccessful()) throw new IOException("Unexpected code " + response); System.out.println(response.body().string()); }

转自 OkHttp使用介绍同时整合了 OkHttp使用进阶这篇文章以及其中的评论。

android http

作者：慕容博客

慕容博客