# okhttp
OkHttp和HttpClient
在性能和使用上不分伯仲，根据实际业务选择即可
# GET请求过程
//HTTP GET
public String get(String url) throws IOException {
//新建OKHttpClient客户端
OkHttpClient client = new OkHttpClient();
//新建一个Request对象
Request request = new Request.Builder()
.url(url)
.build();
//Response为OKHttp中的响应
Response response = client.newCall(request).execute();
if (response.isSuccessful()) {
return response.body().string();
}else{
throw new IOException("Unexpected code " + response);
}
}
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看下builder里面的参数：
final Dispatcher dispatcher; //分发器
final Proxy proxy; //代理
final List<Protocol> protocols; //协议
final List<ConnectionSpec> connectionSpecs; //传输层版本和连接协议
final List<Interceptor> interceptors; //拦截器
final List<Interceptor> networkInterceptors; //网络拦截器
final ProxySelector proxySelector; //代理选择
final CookieJar cookieJar; //cookie
final Cache cache; //缓存
final InternalCache internalCache; //内部缓存
final SocketFactory socketFactory; //socket 工厂
final SSLSocketFactory sslSocketFactory; //安全套接层socket 工厂，用于HTTPS
final CertificateChainCleaner certificateChainCleaner; // 验证确认响应证书 适用 HTTPS 请求连接的主机名。
final HostnameVerifier hostnameVerifier; // 主机名字确认
final CertificatePinner certificatePinner; // 证书链
final Authenticator proxyAuthenticator; //代理身份验证
final Authenticator authenticator; // 本地身份验证
final ConnectionPool connectionPool; //连接池,复用连接
final Dns dns; //域名
final boolean followSslRedirects; //安全套接层重定向
final boolean followRedirects; //本地重定向
final boolean retryOnConnectionFailure; //重试连接失败
final int connectTimeout; //连接超时
final int readTimeout; //read 超时
final int writeTimeout; //write 超时
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真正的流程要从里面的newCall()方法中说起：
/**
* Prepares the {@code request} to be executed at some point in the future.
* 准备将要被执行的request
*/
@Override
public Call newCall(Request request) {
return new RealCall(this, request);
}
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