Retrofit2 应用

开始使用Retrofit

• 基本使用介绍

不啰嗦，直接看：Retrofit官网

项目实际中的问题点

• 添加公共请求参数

• 使用okhttp拦截器

• 根据请求类型分别添加参数

  /**
   * OkHttp 拦截器,请求加上基本参数
   */
  public final class RequestInterceptor implements Interceptor {
  
      @Override
      public Response intercept(@NonNull Chain chain) throws IOException {
  
          Request request = chain.request();
          String method = request.method();
  
          Map<String, Object> basicParamMap = HttpFactory.getBasicParamMap();
  
          if ("GET".equals(method)) {
              //GET请求
              HttpUrl url = request.url();
              HttpUrl.Builder urlbuilder = url.newBuilder();
              for (String key : basicParamMap.keySet()) {
                  urlbuilder.addQueryParameter(key, String.valueOf(basicParamMap.get(key)));
              }
              request = request.newBuilder().url(urlbuilder.build()).build();
          }
  
          if ("POST".equals(method)) {
              //POST请求
              if (request.body() instanceof FormBody) {
                  FormBody formBody = (FormBody) request.body();
                  FormBody.Builder bodyBuilder = new FormBody.Builder();
                  if (formBody != null) {
                      for (int i = 0; i < formBody.size(); i++) {
                          bodyBuilder.add(formBody.encodedName(i), formBody.encodedValue(i));
                      }
                  }
                  if (basicParamMap != null) {
                      for (String key : basicParamMap.keySet()) {
                          bodyBuilder.add(key, String.valueOf(basicParamMap.get(key)));
                      }
                  }
                  request = request.newBuilder().post(bodyBuilder.build()).build();
              }
          }
  
  
          return chain.proceed(request);
      }
  

• 直接在url后面拼接基本参数

  这种情况就不需要区分GET还是POST请求了，比较方便，但是要注意后台是如何获取请求参数的

  /**
   * OkHttp 拦截器,请求加上基本参数
   * 基本参数拼接到url后面
   */
  public final class RequestInterceptor implements Interceptor {
  
      @Override
      public Response intercept(@NonNull Chain chain) throws IOException {
  
          Request request = chain.request();
  
          Map<String, Object> basicParamMap = HttpFactory.getBasicParamMap();
          HttpUrl url = request.url();
          HttpUrl.Builder urlbuilder = url.newBuilder();
          for (String key : basicParamMap.keySet()) {
              urlbuilder.addQueryParameter(key, String.valueOf(basicParamMap.get(key)));
          }
          request = request.newBuilder().url(urlbuilder.build()).build();
  
          return chain.proceed(request);
      }
  
  
  }
  

• 封装请求参数对象

/**
 * App基础请求参数
 */
@Keep
public class BaseParam {

    @JSONField(name = "app_key")
    public String appKey = "appKey";

    @JSONField(name = "device_type")
    public String deviceType = "Android";

    @JSONField(name = "version_code")
    public String versionCode = "1";

    @JSONField(name = "oauth_token")
    public String oauthToken = "token";

}

/**
 * 登录请求参数
 */
@Keep
public class LoginParam extends BaseParam {

    @JSONField(name = "username")
    public String name;

    @JSONField(name = "password")
    public String pwd;

}

/**
 * 账户接口
 */
public interface AccountService {

    @POST(ApiConfig.LOGIN_DOLOGIN)
    Single<BaseResponse<LoginResponse>> login(@Body LoginParam param);

}

• 封装请求参数map

//略