compile 'com.squareup.retrofit2:retrofit:2.0.0'
compile 'com.squareup.retrofit2:converter-gson:2.0.0' //这两个jar版本要一致，否则会有冲突

/**
 * 创建业务请求接口
 */

public interface IUserService {
 /**
  * GET请求
  */
 @GET("Servlet/UserServlet")
 Call<User> getUser(@Query("email") String email);

 /**
  * POST请求
  */
 @FormUrlEncoded
 @POST("UserServlet")
 Call<User> postUser(@Field("name") String name, @Field("email") String email);
}

Retrofit retrofit = new Retrofit.Builder()
    .baseUrl(Constant.BASE_URL)
    .addConverterFactory(GsonConverterFactory.create())
    .build();
IUserService iUserService = retrofit.create(IUserService.class);

Call<ResponseBody> call = iUserService.getUser(xing-java@foxmail.com);

/**
  * 发送GET请求
  */
 private void getRequest() {
  Retrofit retrofit = new Retrofit.Builder()
    .baseUrl(Constant.BASE_URL)
    .addConverterFactory(GsonConverterFactory.create())
    .build();
  IUserService iUserService = retrofit.create(IUserService.class);
  Call<User> call = iUserService.getUser("xing-java@foxmail.com");
  call.enqueue(new Callback<User>() {
   @Override
   public void onResponse(Call<User> call, Response<User> response) {

    Log.i("MainActivity", "response = " + response);
    User user = response.body();
    resTxtView.setText(user.toString());
   }

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

   }
  });
 }

 /**
  * 发送POST请求
  */
 private void postRequest() {
  Retrofit retrofit = new Retrofit.Builder()
    .baseUrl(Constant.BASE_URL)
    .addConverterFactory(GsonConverterFactory.create())
    .build();
  IUserService iUserService = retrofit.create(IUserService.class);
  Call<User> call = iUserService.postUser("star.tao", "xing-java@foxmail.com");
  call.enqueue(new Callback<User>() {
   @Override
   public void onResponse(Call<User> call, Response<User> response) {
   }

   @Override
   public void onFailure(Call<User> call, Throwable throwable) {

   }
  });

private void uploadFile() {
  Retrofit retrofit = new Retrofit.Builder()
    .addConverterFactory(GsonConverterFactory.create())
    .baseUrl(Constant.BASE_URL)
    .build();
  IUserService iUserService = retrofit.create(IUserService.class);
  File file = new File("/sdcard/s.png");
  RequestBody fileRequestBody = RequestBody.create(MediaType.parse("multipart/form-data"), file);
  MultipartBody.Part multipartBody = MultipartBody.Part.createFormData("upload_file", file.getName(), fileRequestBody);
  String desc = "this is file description";
  RequestBody descRequestBody = RequestBody.create(MediaType.parse("multipart/form-data"), desc);
  Call<ResponseBody> call = iUserService.uploadFile(descRequestBody, multipartBody);
  call.enqueue(new Callback<ResponseBody>() {
   @Override
   public void onResponse(Call<ResponseBody> call, Response<ResponseBody> response) {
    Log.i("debug", "upload success");
   }

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

   }
  });

 }