1、实例化OkHttpClient对象，OkHttpClient包含了以下属性，以及set()和get()方法。但并没有包含具体的执行方法，详情见源码。

//实例化OkHttpClent对象   private OkHttpClient client = new OkHttpClient();

private static SSLSocketFactory defaultSslSocketFactory;  private final RouteDatabase routeDatabase;  private Dispatcher dispatcher;  private Proxy proxy;  private List
     
       protocols;  private List
      
        connectionSpecs;  private final List
       
         interceptors = new ArrayList<>();  private final List
        
          networkInterceptors = new ArrayList<>();  private ProxySelector proxySelector;  private CookieHandler cookieHandler;  /** Non-null if this client is caching; possibly by {
    @code cache}. */  private InternalCache internalCache;  private Cache cache;  private SocketFactory socketFactory;  private SSLSocketFactory sslSocketFactory;  private HostnameVerifier hostnameVerifier;  private CertificatePinner certificatePinner;  private Authenticator authenticator;  private ConnectionPool connectionPool;  private Network network;  private boolean followSslRedirects = true;  private boolean followRedirects = true;  private boolean retryOnConnectionFailure = true;  private int connectTimeout = 10_000;  private int readTimeout = 10_000;  private int writeTimeout = 10_000;
        
       
      
     

2、实例化Request对象，大家可以参考Request源码。

    (1)、大家可以先查考--java builder模式 http://www.cnblogs.com/moonz-wu/archive/2011/01/11/1932473.html

    (2)、Request、Response即采用了Builder模式。

    (3)、Request包含了HttpUrl、Method、Headers、RequestBody、Tag等参数。以及httpUrl()、method()、headers()、body()、tag()等方法(类似于get()方法)。

    (4)、并没有包含有关网络操作和其他操作的方法。

3、实例化RequestBody方法，大家可以参考RequestBody源码。

    (1)、第一可以通过RequestBody内部静态方法实现。

RequestBody body = RequestBody.create(final MediaType contentType, final ByteString content);

    (2)、第二可以通过重写RequestBody的writeTo()和contentType()方法。

RequestBody body = new RequestBody() {                        @Override            public void writeTo(BufferedSink arg0) throws IOException {                // TODO Auto-generated method stub                            }                        @Override            public MediaType contentType() {                // TODO Auto-generated method stub                return null;            }        };