1. 首先，建立OkhttpClient 和Retrofit的網路框架
2. 其次，建立Retrofit的請求介面
3. 最後，通過RxJava監聽觀察者並獲取請求介面的結果。
4. 實踐：

/**
 * @author zhou.jn on 2018/11/22 13:38.
 */
public class App extends Application {
    private static final String TAG = "App";
    private static OkHttpClient okHttpClient;
    private static Retrofit retrofit;
 

    private static App app;

    @Override
    public void onCreate() {
        super.onCreate();
        app = this;
        OkhttpInstance();
        RetrofitInstance();
    }
	//1. 建立OkhttpClient
    private static OkHttpClient OkhttpInstance() {
        if (okHttpClient == null) {
            OkHttpClient.
 
Builder builder = new OkHttpClient.Builder()
            //設定連結超時時間
            .connectTimeout(500, TimeUnit.MILLISECONDS)
            		//設定讀取超時時間
                    .readTimeout(1000, TimeUnit.MILLISECONDS)
                    //設定寫入超時時間
                    .writeTimeout(1000, TimeUnit.MILLISECONDS)
                    //設定快取目錄
 

                    .cache(new Cache(app.getExternalCacheDir(), 10 * 1024 * 1024))
                    .build();
           
            });
            return okHttpClient;
        } else {
            return okHttpClient;
        }
    }

    public static Retrofit RetrofitInstance() {
        if (retrofit == null) {
            retrofit = new Retrofit.Builder()
            		//新增基礎URL,需要以"/"結尾，例："http://www.baidu.com/"
                    .baseUrl(Http.DEFAULT_BASE_URL)
                    //新增RxJava支援
                    .addCallAdapterFactory(RxJavaCallAdapterFactory.create())
                    /**新增解析方式（這裡可能會因為解析的方式不同，導致產生404或者解析字串不全的現象*/
                    .addConverterFactory(ScalarsConverterFactory.create())
                    .client(okHttpClient)
                    .build();
            return retrofit;
        } else {
            return retrofit;
        }
    }
}

2.Retrofit註解中文版：https://www.jianshu.com/p/0fda3132cf98
瞭解@Post @[email protected]@

/**
 * @author zhou.jn on 2018/11/22 14:49.
 */
public interface Ipost {
	//介面請求，基本的請求要與後臺定義的請求協議一致，例：是否需要新增請求頭等。
    String REQUEST_HEAD = "User-Agent";
    String GET_IP_TAG = "client/ipinfo";
    String REQUEST_PERSONAL = "client/queryOttAccount";
    
    @POST(GET_IP_TAG)
    Observable<String> getPublicIp(@Header(REQUEST_HEAD) String headValue);
    
	//請求方式一：需使用拼接的字串進行請求，可以定義拼接字串
    @POST(REQUEST_PERSONAL)
    Observable<String> queryPersonInfo(@Body String content);
    
	//請求方式二：直接寫全請求介面，此時，將忽略在retrofit中設定的baseUrl 例： Http.DEFAULT_BASE_URL
    @POST("http://IP:Port/請求拼接的引數")
    Observable<String> queryRechargeInfo(@Body String content);
	 }

3.進行請求

 final Ipost ipost = App.RetrofitInstance().create(Ipost.class);
 MySubscriber subscriber = new MySubscriber(httpKey);
        ipost.queryPersonInfo(httpEnContent)
                .subscribeOn(Schedulers.newThread())
                .observeOn(AndroidSchedulers.mainThread())
              //以下注冊採用其一：
              //方式一: 自定義 註冊 
              .subscribe(subscriber);
              //方式二：
               .subscribe(new Subscriber<String>() {
                    @Override
                    public void onCompleted() {
                        Log.i(TAG, "onCompleted: ");
                    }

                    @Override
                    public void onError(Throwable e) {
                        Log.i(TAG, "onError: "+e.getMessage());
                    }

                    @Override
                    public void onNext(String s) {
                        Log.i(TAG, "onNext: "+s);
                        String decryptResult = AESUtils.decryptResult(s,httpKey);
                        Log.i(TAG,"解密後："+decryptResult);
                    }
                });

public class MySubscriber extends Subscriber<String> {
    private static final String TAG = "MySubscriber";

    private String httpKey;
    private String decontent;
    public String result;


    public MySubscriber(String httpKey) {
        this.httpKey = httpKey;
    }
	//相比較，自定義Subscriber 多一個 onStart()，在onNext()之前被呼叫，可以進行一些初始化操作
    @Override
    public void onStart() {
        super.onStart();
        Log.i(TAG,"start");

    }

    @Override
    public void onCompleted() {
        Log.i(TAG,"completed");

    }

    @Override
    public void onError(Throwable e) {
        Log.i(TAG,"onError: "+e.getMessage());
    }

    @Override
    public void onNext(String enString) {
        Log.i(TAG, "onNext: "+ enString);
        String decryptResult = AESUtils.decryptResult(enString, httpKey);
        //獲取請求結果
        Log.i(TAG,"decryptResult: "+ decryptResult);
    }
}

4.結束