关于OkHttp工具类的使用

/**

• 静态内部类单例模式

• OKHttp的重点

• 1：同步和异步的区别

• 2：get和POST怎么使用

• 3：怎么封装

• 扩展有拦截器，上传图片，源码区看一看
  */
  public class OkUtils {
  private OkHttpClient okHttpClient;

  private OkUtils() {
  //日志拦截器
  HttpLoggingInterceptor loggingInterceptor = new HttpLoggingInterceptor();
  okHttpClient = new OkHttpClient.Builder()
  .connectTimeout(20, TimeUnit.SECONDS)
  .readTimeout(20, TimeUnit.SECONDS)
  .callTimeout(20, TimeUnit.SECONDS)
  .addInterceptor(loggingInterceptor)
  .build();
  }
  //使用单列模式
  public static OkUtils getInstance() {
  return OkHolder.okUtils;
  }

  static class OkHolder {
  private static final OkUtils okUtils = new OkUtils();
  }

  //这是同步的get和post
  public String getSync(String url) throws IOException {
  Request request = new Request.Builder().url(url).build();
  return okHttpClient.newCall(request).execute().body().string();
  }

  public String postSync(String url, String key, String value) throws IOException {
  RequestBody body = new FormBody.Builder().add(key, value).build();
  Request request = new Request.Builder().url(url).post(body).build();
  return okHttpClient.newCall(request).execute().body().string();
  }

  //异步的get和post

  public void getAsync(String url, Callback callback) {
  Request request = new Request.Builder().url(url).build();
  okHttpClient.newCall(request).enqueue(callback);
  }

  public void postAsync(String url, Callback callback) {
  RequestBody body = new FormBody.Builder().add(“key”, “value”).build();
  Request request = new Request.Builder().url(url).post(body).build();
  okHttpClient.newCall(request).enqueue(callback);
  }

  //上传图片 必须是POST
  public void upLoadImage(String url, String uid, Callback callback) {
  File file = new File(Environment.getExternalStorageDirectory() + “/Pictures/test.jpg”);
  //上传图片需要 MultipartBody
  MultipartBody.Builder body = new MultipartBody.Builder().setType(MultipartBody.FORM)
  .addFormDataPart(“uid”, uid)
  .addFormDataPart(“file”, “test.jpg”, RequestBody.create(MediaType.parse(“image/jpg”), file));
  RequestBody body1 = body.build();
  Request request = new Request.Builder().url(url).post(body1).build();
  okHttpClient.newCall(request).enqueue(callback);

  }

}