Android网络开发之OkHttp--基本用法实例化各个对象

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<Protocol> protocols;
  private List<ConnectionSpec> connectionSpecs;
  private final List<Interceptor> interceptors = new ArrayList<>();
  private final List<Interceptor> 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;
            }
        };