在上面兩講中學習了OkHttp的使用，OkHttp還是很強大的。

而本人更喜歡Retrofit+OkHttp結合來實現網路請求，Retrofit使用註解，更加清晰與明瞭。下面用Retrofit實現簡單的Get與Post請求。

一、伺服器端

新建OkHttpServer伺服器專案，Tomcat伺服器具體配置可以參考搭建本地Tomcat伺服器及相關配置 。在專案下新建PostAndGetServlet：最後啟動伺服器。

@WebServlet("/PostAndGetServlet")
public class PostAndGetServlet extends HttpServlet {
    private
 
 static final long serialVersionUID = 1L;

    /**
     * @see HttpServlet#HttpServlet()
     */
    public PostAndGetServlet() {
        super();
        // TODO Auto-generated constructor stub
    }

    /**
     * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
     */
    protected
 
 void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        System.out.println("doGet");
        String userName = request.getParameter("username");
        String password = request.getParameter("password");
        System.out.println("userName=="
 
+userName+"==password=="+password);
        response.setCharacterEncoding("UTF-8");
        PrintWriter writer = response.getWriter();
        writer.print("Get收到資訊");
    }

    /**
     * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        System.out.println("doPost");
        String userName = request.getParameter("username");
        String password = request.getParameter("password");
        System.out.println("userName=="+userName+"==password=="+password);
        try {
            Thread.sleep(5000);
        } catch (InterruptedException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        response.setCharacterEncoding("UTF-8");
        PrintWriter writer = response.getWriter();
        writer.print("Post收到資訊");
    }

}

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二、Android端

1.build.gradle引入相應的jar包

  compile fileTree(dir: 'libs', include: ['*.jar'])
    compile 'com.android.support:appcompat-v7:24.1.1'
    testCompile 'junit:junit:4.12'
    compile files('libs/gson-2.4.jar')
    compile 'com.squareup.retrofit2:converter-gson:2.1.0'
    compile 'com.squareup.retrofit2:retrofit:2.1.0'
    compile 'com.squareup.retrofit2:converter-scalars:2.0.0'
    compile 'io.reactivex:rxjava:1.1.0'
    compile 'io.reactivex:rxandroid:1.1.0'
    compile 'com.squareup.retrofit2:adapter-rxjava:2.0.0-beta4'

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2.在layout檔案中增加兩個按鈕：

   <Button
        android:id="@+id/refrofit_get"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="GET_TEST" />


    <Button
        android:id="@+id/refrofit_post"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="POST_TEST" />

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在Activity中例項化兩個按鈕，並設定點選事件。程式碼就不貼了。

3.新建RetrofitUtil類，編寫以下兩個方法：

public class RetrofitUtil {

//電腦端cmd輸入ipconfig獲取ip
   public static String baseUrl = "http://192.168.0.100:8080/OkHttpServer/";

   public static  Retrofit.Builder retrofitBuilder = new Retrofit.Builder()
           .addCallAdapterFactory(RxJavaCallAdapterFactory.create())
    //返回string型別，如果返回的是json型別：addConverterFactory(GsonConverterFactory.create())    
        .addConverterFactory(ScalarsConverterFactory.create())
           .baseUrl(baseUrl);


    private static OkHttpClient okHttpClient = new OkHttpClient.Builder().connectTimeout(10000, TimeUnit.MILLISECONDS)
            .readTimeout(10000,TimeUnit.MILLISECONDS)
            .writeTimeout(10000,TimeUnit.MILLISECONDS).build();

//get請求
    public static void testGet(){
        InterfaceRetrofit.GetPetrofit getPetrofit = retrofitBuilder.build().create(InterfaceRetrofit.GetPetrofit.class);
        getPetrofit.getTest("xiaohong","123").enqueue(new Callback<String>() {
            @Override
            public void onResponse(Call<String> call, Response<String> response) {

                Log.i("test",response.body().toString());
            }

            @Override
            public void onFailure(Call<String> call, Throwable t) {

            }
        });
    }

//post請求
    public static void testPost(){
        InterfaceRetrofit.PostRetrofit postRetrofit = retrofitBuilder.build().create(InterfaceRetrofit.PostRetrofit.class);
        postRetrofit.postTest("xiaoqing","456").enqueue(new Callback<String>() {
            @Override
            public void onResponse(Call<String> call, Response<String> response) {
                Log.i("test",response.body().toString());
            }

            @Override
            public void onFailure(Call<String> call, Throwable t) {

            }
        });
    }
}

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4.Retrofit的呼叫是通過介面實現的，上面的get與post請求也是，相應介面如下：

public interface InterfaceRetrofit {

    public interface GetPetrofit {
        @GET("PostAndGetServlet")
        Call<String> getTest(@Query("username") String username, @Query("password") String password);
    }


    public interface PostRetrofit{
        @FormUrlEncoded
        @POST("PostAndGetServlet")
        Call<String> postTest(@Field("username") String username, @Field("password")String password);
    }
}

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5.為兩個按鈕新增點選事件，分別新增以上兩個方法。最後別忘了相應的許可權：

    <uses-permission android:name="android.permission.INTERNET"/>

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6.Android 端相關log：

07-03 20:41:07.772 25048-25048/com.huang.retrofit I/test: Get收到資訊
07-03 20:41:16.952 25048-25048/com.huang.retrofit I/test: Post收到資訊

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伺服器端log：

轉自：https://blog.csdn.net/Gary__123456/article/details/74275974