详解Android OkHttp完全解析

一、概述

最近在群里听到各种讨论okhttp的话题，可见okhttp的口碑相当好了。再加上Google貌似在6.0版本里面删除了HttpClient相关API，对于这个行为不做评价。为了更好的在应对网络访问，学习下okhttp还是蛮必要的，本篇博客首先介绍okhttp的简单使用，主要包含：

• 一般的get请求
• 一般的post请求
• 基于Http的文件上传
• 文件下载
• 加载图片
• 支持请求回调，直接返回对象、对象集合
• 支持session的保持

最后会对上述几个功能进行封装，完整的封装类的地址见：http://xiazai.jb51.net/201611/yuanma/okhttputils-master_jb51.zip

使用前，对于Android Studio的用户，可以选择添加:
compile 'com.squareup.okhttp:okhttp:2.4.0'
或者Eclipse的用户，可以下载最新的jarokhttp he latest JAR，添加依赖就可以用了。

注意:okhttp内部依赖okio，别忘了同时导入okio：

gradle: compile 'com.squareup.okio:okio:1.5.0'

最新的jar地址：okio the latest JAR

二、使用教程

（一）Http Get

对了网络加载库，那么最常见的肯定就是http get请求了，比如获取一个网页的内容。

//创建okHttpClient对象
OkHttpClient mOkHttpClient = new OkHttpClient();
//创建一个Request
final Request request = new Request.Builder()
    .url("https://github.com/hongyangAndroid")
    .build();
//new call
Call call = mOkHttpClient.newCall(request);
//请求加入调度
call.enqueue(new Callback()
  {
   @Override
   public void onFailure(Request request, IOException e)
   {
   }

   @Override
   public void onResponse(final Response response) throws IOException
   {
     //String htmlStr = response.body().string();
   }
  });

1.以上就是发送一个get请求的步骤，首先构造一个Request对象，参数最起码有个url，当然你可以通过Request.Builder设置更多的参数比如：header、method等。

2.然后通过request的对象去构造得到一个Call对象，类似于将你的请求封装成了任务，既然是任务，就会有execute()和cancel()等方法。

3.最后，我们希望以异步的方式去执行请求，所以我们调用的是call.enqueue，将call加入调度队列，然后等待任务执行完成，我们在Callback中即可得到结果。

看到这，你会发现，整体的写法还是比较长的，所以封装肯定是要做的，不然每个请求这么写，得累死。

ok，需要注意几点：

1、onResponse回调的参数是response，一般情况下，比如我们希望获得返回的字符串，可以通过response.body().string()获取；如果希望获得返回的二进制字节数组，则调用response.body().bytes()；如果你想拿到返回的inputStream，则调用response.body().byteStream()

看到这，你可能会奇怪，竟然还能拿到返回的inputStream，看到这个最起码能意识到一点，这里支持大文件下载，有inputStream我们就可以通过IO的方式写文件。不过也说明一个问题，这个onResponse执行的线程并不是UI线程。的确是的，如果你希望操作控件，还是需要使用handler等，例如：

@Override
public void onResponse(final Response response) throws IOException
{
  final String res = response.body().string();
  runOnUiThread(new Runnable()
  {
   @Override
   public void run()
   {
   mTv.setText(res);
   }

  });
}

2、我们这里是异步的方式去执行，当然也支持阻塞的方式，上面我们也说了Call有一个execute()方法，你也可以直接调用call.execute()通过返回一个Response。

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(二) Http Post 携带参数

看来上面的简单的get请求，基本上整个的用法也就掌握了，比如post携带参数，也仅仅是Request的构造的不同。

Request request = buildMultipartFormRequest(
  url, new File[]{file}, new String[]{fileKey}, null);
FormEncodingBuilder builder = new FormEncodingBuilder();
builder.add("username","张鸿洋");

Request request = new Request.Builder()
     .url(url)
    .post(builder.build())
    .build();
 mOkHttpClient.newCall(request).enqueue(new Callback(){});

大家都清楚，post的时候，参数是包含在请求体中的；所以我们通过FormEncodingBuilder。添加多个String键值对，然后去构造RequestBody，最后完成我们Request的构造。

后面的就和上面一样了。

--------------------------------------------------------------------------------

（三）基于Http的文件上传

接下来我们在介绍一个可以构造RequestBody的Builder，叫做MultipartBuilder。当我们需要做类似于表单上传的时候，就可以使用它来构造我们的requestBody。

File file = new File(Environment.getExternalStorageDirectory(), "balabala.mp4");

RequestBody fileBody = RequestBody.create(MediaType.parse("application/octet-stream"), file);

RequestBody requestBody = new MultipartBuilder()
  .type(MultipartBuilder.FORM)
  .addPart(Headers.of(
   "Content-Disposition",
    "form-data; name=\"username\""),
   RequestBody.create(null, "张鸿洋"))
  .addPart(Headers.of(
   "Content-Disposition",
   "form-data; name=\"mFile\";
   filename=\"wjd.mp4\""), fileBody)
  .build();

Request request = new Request.Builder()
 .url("http://192.168.1.103:8080/okHttpServer/fileUpload")
 .post(requestBody)
 .build();

Call call = mOkHttpClient.newCall(request);
call.enqueue(new Callback()
{
 //...
});

上述代码向服务器传递了一个键值对username:张鸿洋和一个文件。我们通过MultipartBuilder的addPart方法可以添加键值对或者文件。

其实类似于我们拼接模拟浏览器行为的方式，如果你对这块不了解，可以参考：从原理角度解析Android （Java） http 文件上传

ok，对于我们最开始的目录还剩下图片下载，文件下载；这两个一个是通过回调的Response拿到byte[]然后decode成图片；文件下载，就是拿到inputStream做写文件操作，我们这里就不赘述了。

接下来我们主要看如何封装上述的代码。

--------------------------------------------------------------------------------

三、封装

由于按照上述的代码，写多个请求肯定包含大量的重复代码，所以我希望封装后的代码调用是这样的：

（一）使用

1.一般的get请求

OkHttpClientManager.getAsyn("https://www.baidu.com", new OkHttpClientManager.ResultCallback<String>()
  {
   @Override
   public void onError(Request request, Exception e)
   {
    e.printStackTrace();
   }

   @Override
   public void onResponse(String u)
   {
    mTv.setText(u);//注意这里是UI线程
   }
  });

对于一般的请求，我们希望给个url，然后CallBack里面直接操作控件。

2.文件上传且携带参数

我们希望提供一个方法，传入url,params,file,callback即可。

 OkHttpClientManager.postAsyn("http://192.168.1.103:8080/okHttpServer/fileUpload",//
 new OkHttpClientManager.ResultCallback<String>()
 {
  @Override
  public void onError(Request request, IOException e)
  {
   e.printStackTrace();
  }

  @Override
  public void onResponse(String result)
  {

  }
 },//
 file,//
 "mFile",//
 new OkHttpClientManager.Param[]{
   new OkHttpClientManager.Param("username", "zhy"),
   new OkHttpClientManager.Param("password", "123")}
  );

键值对没什么说的，参数3为file，参数4为file对应的name，这个name不是文件的名字；
 对应于http中的

<input type="file" name="mFile" > 

对应的是name后面的值，即mFile.

3.文件下载

对于文件下载，提供url，目标dir，callback即可。

OkHttpClientManager.downloadAsyn(
 "http://192.168.1.103:8080/okHttpServer/files/messenger_01.png",
 Environment.getExternalStorageDirectory().getAbsolutePath(),
new OkHttpClientManager.ResultCallback<String>()
 {
  @Override
  public void onError(Request request, IOException e)
  {

  }

  @Override
  public void onResponse(String response)
  {
   //文件下载成功，这里回调的reponse为文件的absolutePath
  }
});

4.展示图片

展示图片，我们希望提供一个url和一个imageview，如果下载成功，直接帮我们设置上即可。

OkHttpClientManager.displayImage(mImageView,
  http://images.csdn.net/20150817/1.jpg);

内部会自动根据imageview的大小自动对图片进行合适的压缩。虽然，这里可能不适合一次性加载大量图片的场景，但是对于app中偶尔有几个图片的加载，还是可用的。

四、整合Json

很多人提出项目中使用时，服务端返回的是Json字符串，希望客户端回调可以直接拿到对象，于是整合进入了json，完善该功能。

（一）直接回调对象

例如现在有个User实体类：

package com.zhy.utils.http.okhttp;

public class User {

 public String username ;
 public String password ;

 public User() {
  // TODO Auto-generated constructor stub
 }

 public User(String username, String password) {
  this.username = username;
  this.password = password;
 }

 @Override
 public String toString()
 {
  return "User{" +
    "username='" + username + '\'' +
    ", password='" + password + '\'' +
    '}';
 }
}

服务端返回：

{"username":"zhy","password":"123"}

客户端可以如下方式调用：

 OkHttpClientManager.getAsyn("http://192.168.56.1:8080/okHttpServer/user!getUser",
new OkHttpClientManager.ResultCallback<User>()
{
 @Override
 public void onError(Request request, Exception e)
 {
  e.printStackTrace();
 }

 @Override
 public void onResponse(User user)
 {
  mTv.setText(u.toString());//UI线程
 }
});

我们传入泛型User，在onResponse里面直接回调User对象。

这里特别要注意的事，如果在json字符串->实体对象过程中发生错误，程序不会崩溃，onError方法会被回调。

注意：这里做了少许的更新，接口命名从StringCallback修改为ResultCallback。接口中的onFailure方法修改为onError。

(二) 回调对象集合

依然是上述的User类，服务端返回

[{"username":"zhy","password":"123"},{"username":"lmj","password":"12345"}]

则客户端可以如下调用：

OkHttpClientManager.getAsyn("http://192.168.56.1:8080/okHttpServer/user!getUsers",
new OkHttpClientManager.ResultCallback<List<User>>()
{
 @Override
 public void onError(Request request, Exception e)
 {
  e.printStackTrace();
 }
 @Override
 public void onResponse(List<User> us)
 {
  Log.e("TAG", us.size() + "");
  mTv.setText(us.get(1).toString());
 }
});

唯一的区别，就是泛型变为List<User> ，ok ， 如果发现bug或者有任何意见欢迎留言。

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源码

ok，基本介绍完了，对于封装的代码其实也很简单，我就直接贴出来了，因为也没什么好介绍的，如果你看完上面的用法，肯定可以看懂：

package com.zhy.utils.http.okhttp;

import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Handler;
import android.os.Looper;
import android.widget.ImageView;

import com.google.gson.Gson;
import com.google.gson.internal.$Gson$Types;
import com.squareup.okhttp.Call;
import com.squareup.okhttp.Callback;
import com.squareup.okhttp.FormEncodingBuilder;
import com.squareup.okhttp.Headers;
import com.squareup.okhttp.MediaType;
import com.squareup.okhttp.MultipartBuilder;
import com.squareup.okhttp.OkHttpClient;
import com.squareup.okhttp.Request;
import com.squareup.okhttp.RequestBody;
import com.squareup.okhttp.Response;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.net.CookieManager;
import java.net.CookiePolicy;
import java.net.FileNameMap;
import java.net.URLConnection;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;

/**
 * Created by zhy on 15/8/17.
 */
public class OkHttpClientManager
{
 private static OkHttpClientManager mInstance;
 private OkHttpClient mOkHttpClient;
 private Handler mDelivery;
 private Gson mGson;

 private static final String TAG = "OkHttpClientManager";

 private OkHttpClientManager()
 {
  mOkHttpClient = new OkHttpClient();
  //cookie enabled
  mOkHttpClient.setCookieHandler(new CookieManager(null, CookiePolicy.ACCEPT_ORIGINAL_SERVER));
  mDelivery = new Handler(Looper.getMainLooper());
  mGson = new Gson();
 }

 public static OkHttpClientManager getInstance()
 {
  if (mInstance == null)
  {
   synchronized (OkHttpClientManager.class)
   {
    if (mInstance == null)
    {
     mInstance = new OkHttpClientManager();
    }
   }
  }
  return mInstance;
 }

 /**
  * 同步的Get请求
  *
  * @param url
  * @return Response
  */
 private Response _getAsyn(String url) throws IOException
 {
  final Request request = new Request.Builder()
    .url(url)
    .build();
  Call call = mOkHttpClient.newCall(request);
  Response execute = call.execute();
  return execute;
 }

 /**
  * 同步的Get请求
  *
  * @param url
  * @return 字符串
  */
 private String _getAsString(String url) throws IOException
 {
  Response execute = _getAsyn(url);
  return execute.body().string();
 }

 /**
  * 异步的get请求
  *
  * @param url
  * @param callback
  */
 private void _getAsyn(String url, final ResultCallback callback)
 {
  final Request request = new Request.Builder()
    .url(url)
    .build();
  deliveryResult(callback, request);
 }

 /**
  * 同步的Post请求
  *
  * @param url
  * @param params post的参数
  * @return
  */
 private Response _post(String url, Param... params) throws IOException
 {
  Request request = buildPostRequest(url, params);
  Response response = mOkHttpClient.newCall(request).execute();
  return response;
 }

 /**
  * 同步的Post请求
  *
  * @param url
  * @param params post的参数
  * @return 字符串
  */
 private String _postAsString(String url, Param... params) throws IOException
 {
  Response response = _post(url, params);
  return response.body().string();
 }

 /**
  * 异步的post请求
  *
  * @param url
  * @param callback
  * @param params
  */
 private void _postAsyn(String url, final ResultCallback callback, Param... params)
 {
  Request request = buildPostRequest(url, params);
  deliveryResult(callback, request);
 }

 /**
  * 异步的post请求
  *
  * @param url
  * @param callback
  * @param params
  */
 private void _postAsyn(String url, final ResultCallback callback, Map<String, String> params)
 {
  Param[] paramsArr = map2Params(params);
  Request request = buildPostRequest(url, paramsArr);
  deliveryResult(callback, request);
 }

 /**
  * 同步基于post的文件上传
  *
  * @param params
  * @return
  */
 private Response _post(String url, File[] files, String[] fileKeys, Param... params) throws IOException
 {
  Request request = buildMultipartFormRequest(url, files, fileKeys, params);
  return mOkHttpClient.newCall(request).execute();
 }

 private Response _post(String url, File file, String fileKey) throws IOException
 {
  Request request = buildMultipartFormRequest(url, new File[]{file}, new String[]{fileKey}, null);
  return mOkHttpClient.newCall(request).execute();
 }

 private Response _post(String url, File file, String fileKey, Param... params) throws IOException
 {
  Request request = buildMultipartFormRequest(url, new File[]{file}, new String[]{fileKey}, params);
  return mOkHttpClient.newCall(request).execute();
 }

 /**
  * 异步基于post的文件上传
  *
  * @param url
  * @param callback
  * @param files
  * @param fileKeys
  * @throws IOException
  */
 private void _postAsyn(String url, ResultCallback callback, File[] files, String[] fileKeys, Param... params) throws IOException
 {
  Request request = buildMultipartFormRequest(url, files, fileKeys, params);
  deliveryResult(callback, request);
 }

 /**
  * 异步基于post的文件上传，单文件不带参数上传
  *
  * @param url
  * @param callback
  * @param file
  * @param fileKey
  * @throws IOException
  */
 private void _postAsyn(String url, ResultCallback callback, File file, String fileKey) throws IOException
 {
  Request request = buildMultipartFormRequest(url, new File[]{file}, new String[]{fileKey}, null);
  deliveryResult(callback, request);
 }

 /**
  * 异步基于post的文件上传，单文件且携带其他form参数上传
  *
  * @param url
  * @param callback
  * @param file
  * @param fileKey
  * @param params
  * @throws IOException
  */
 private void _postAsyn(String url, ResultCallback callback, File file, String fileKey, Param... params) throws IOException
 {
  Request request = buildMultipartFormRequest(url, new File[]{file}, new String[]{fileKey}, params);
  deliveryResult(callback, request);
 }

 /**
  * 异步下载文件
  *
  * @param url
  * @param destFileDir 本地文件存储的文件夹
  * @param callback
  */
 private void _downloadAsyn(final String url, final String destFileDir, final ResultCallback callback)
 {
  final Request request = new Request.Builder()
    .url(url)
    .build();
  final Call call = mOkHttpClient.newCall(request);
  call.enqueue(new Callback()
  {
   @Override
   public void onFailure(final Request request, final IOException e)
   {
    sendFailedStringCallback(request, e, callback);
   }

   @Override
   public void onResponse(Response response)
   {
    InputStream is = null;
    byte[] buf = new byte[2048];
    int len = 0;
    FileOutputStream fos = null;
    try
    {
     is = response.body().byteStream();
     File file = new File(destFileDir, getFileName(url));
     fos = new FileOutputStream(file);
     while ((len = is.read(buf)) != -1)
     {
      fos.write(buf, 0, len);
     }
     fos.flush();
     //如果下载文件成功，第一个参数为文件的绝对路径
     sendSuccessResultCallback(file.getAbsolutePath(), callback);
    } catch (IOException e)
    {
     sendFailedStringCallback(response.request(), e, callback);
    } finally
    {
     try
     {
      if (is != null) is.close();
     } catch (IOException e)
     {
     }
     try
     {
      if (fos != null) fos.close();
     } catch (IOException e)
     {
     }
    }

   }
  });
 }

 private String getFileName(String path)
 {
  int separatorIndex = path.lastIndexOf("/");
  return (separatorIndex < 0) ? path : path.substring(separatorIndex + 1, path.length());
 }

 /**
  * 加载图片
  *
  * @param view
  * @param url
  * @throws IOException
  */
 private void _displayImage(final ImageView view, final String url, final int errorResId)
 {
  final Request request = new Request.Builder()
    .url(url)
    .build();
  Call call = mOkHttpClient.newCall(request);
  call.enqueue(new Callback()
  {
   @Override
   public void onFailure(Request request, IOException e)
   {
    setErrorResId(view, errorResId);
   }

   @Override
   public void onResponse(Response response)
   {
    InputStream is = null;
    try
    {
     is = response.body().byteStream();
     ImageUtils.ImageSize actualImageSize = ImageUtils.getImageSize(is);
     ImageUtils.ImageSize imageViewSize = ImageUtils.getImageViewSize(view);
     int inSampleSize = ImageUtils.calculateInSampleSize(actualImageSize, imageViewSize);
     try
     {
      is.reset();
     } catch (IOException e)
     {
      response = _getAsyn(url);
      is = response.body().byteStream();
     }

     BitmapFactory.Options ops = new BitmapFactory.Options();
     ops.inJustDecodeBounds = false;
     ops.inSampleSize = inSampleSize;
     final Bitmap bm = BitmapFactory.decodeStream(is, null, ops);
     mDelivery.post(new Runnable()
     {
      @Override
      public void run()
      {
       view.setImageBitmap(bm);
      }
     });
    } catch (Exception e)
    {
     setErrorResId(view, errorResId);

    } finally
    {
     if (is != null) try
     {
      is.close();
     } catch (IOException e)
     {
      e.printStackTrace();
     }
    }
   }
  });

 }

 private void setErrorResId(final ImageView view, final int errorResId)
 {
  mDelivery.post(new Runnable()
  {
   @Override
   public void run()
   {
    view.setImageResource(errorResId);
   }
  });
 }

 //*************对外公布的方法************

 public static Response getAsyn(String url) throws IOException
 {
  return getInstance()._getAsyn(url);
 }

 public static String getAsString(String url) throws IOException
 {
  return getInstance()._getAsString(url);
 }

 public static void getAsyn(String url, ResultCallback callback)
 {
  getInstance()._getAsyn(url, callback);
 }

 public static Response post(String url, Param... params) throws IOException
 {
  return getInstance()._post(url, params);
 }

 public static String postAsString(String url, Param... params) throws IOException
 {
  return getInstance()._postAsString(url, params);
 }

 public static void postAsyn(String url, final ResultCallback callback, Param... params)
 {
  getInstance()._postAsyn(url, callback, params);
 }

 public static void postAsyn(String url, final ResultCallback callback, Map<String, String> params)
 {
  getInstance()._postAsyn(url, callback, params);
 }

 public static Response post(String url, File[] files, String[] fileKeys, Param... params) throws IOException
 {
  return getInstance()._post(url, files, fileKeys, params);
 }

 public static Response post(String url, File file, String fileKey) throws IOException
 {
  return getInstance()._post(url, file, fileKey);
 }

 public static Response post(String url, File file, String fileKey, Param... params) throws IOException
 {
  return getInstance()._post(url, file, fileKey, params);
 }

 public static void postAsyn(String url, ResultCallback callback, File[] files, String[] fileKeys, Param... params) throws IOException
 {
  getInstance()._postAsyn(url, callback, files, fileKeys, params);
 }

 public static void postAsyn(String url, ResultCallback callback, File file, String fileKey) throws IOException
 {
  getInstance()._postAsyn(url, callback, file, fileKey);
 }

 public static void postAsyn(String url, ResultCallback callback, File file, String fileKey, Param... params) throws IOException
 {
  getInstance()._postAsyn(url, callback, file, fileKey, params);
 }

 public static void displayImage(final ImageView view, String url, int errorResId) throws IOException
 {
  getInstance()._displayImage(view, url, errorResId);
 }

 public static void displayImage(final ImageView view, String url)
 {
  getInstance()._displayImage(view, url, -1);
 }

 public static void downloadAsyn(String url, String destDir, ResultCallback callback)
 {
  getInstance()._downloadAsyn(url, destDir, callback);
 }

 //****************************

 private Request buildMultipartFormRequest(String url, File[] files,
            String[] fileKeys, Param[] params)
 {
  params = validateParam(params);

  MultipartBuilder builder = new MultipartBuilder()
    .type(MultipartBuilder.FORM);

  for (Param param : params)
  {
   builder.addPart(Headers.of("Content-Disposition", "form-data; name=\"" + param.key + "\""),
     RequestBody.create(null, param.value));
  }
  if (files != null)
  {
   RequestBody fileBody = null;
   for (int i = 0; i < files.length; i++)
   {
    File file = files[i];
    String fileName = file.getName();
    fileBody = RequestBody.create(MediaType.parse(guessMimeType(fileName)), file);
    //TODO 根据文件名设置contentType
    builder.addPart(Headers.of("Content-Disposition",
        "form-data; name=\"" + fileKeys[i] + "\"; filename=\"" + fileName + "\""),
      fileBody);
   }
  }

  RequestBody requestBody = builder.build();
  return new Request.Builder()
    .url(url)
    .post(requestBody)
    .build();
 }

 private String guessMimeType(String path)
 {
  FileNameMap fileNameMap = URLConnection.getFileNameMap();
  String contentTypeFor = fileNameMap.getContentTypeFor(path);
  if (contentTypeFor == null)
  {
   contentTypeFor = "application/octet-stream";
  }
  return contentTypeFor;
 }

 private Param[] validateParam(Param[] params)
 {
  if (params == null)
   return new Param[0];
  else return params;
 }

 private Param[] map2Params(Map<String, String> params)
 {
  if (params == null) return new Param[0];
  int size = params.size();
  Param[] res = new Param[size];
  Set<Map.Entry<String, String>> entries = params.entrySet();
  int i = 0;
  for (Map.Entry<String, String> entry : entries)
  {
   res[i++] = new Param(entry.getKey(), entry.getValue());
  }
  return res;
 }

 private static final String SESSION_KEY = "Set-Cookie";
 private static final String mSessionKey = "JSESSIONID";

 private Map<String, String> mSessions = new HashMap<String, String>();

 private void deliveryResult(final ResultCallback callback, Request request)
 {
  mOkHttpClient.newCall(request).enqueue(new Callback()
  {
   @Override
   public void onFailure(final Request request, final IOException e)
   {
    sendFailedStringCallback(request, e, callback);
   }

   @Override
   public void onResponse(final Response response)
   {
    try
    {
     final String string = response.body().string();
     if (callback.mType == String.class)
     {
      sendSuccessResultCallback(string, callback);
     } else
     {
      Object o = mGson.fromJson(string, callback.mType);
      sendSuccessResultCallback(o, callback);
     }

    } catch (IOException e)
    {
     sendFailedStringCallback(response.request(), e, callback);
    } catch (com.google.gson.JsonParseException e)//Json解析的错误
    {
     sendFailedStringCallback(response.request(), e, callback);
    }

   }
  });
 }

 private void sendFailedStringCallback(final Request request, final Exception e, final ResultCallback callback)
 {
  mDelivery.post(new Runnable()
  {
   @Override
   public void run()
   {
    if (callback != null)
     callback.onError(request, e);
   }
  });
 }

 private void sendSuccessResultCallback(final Object object, final ResultCallback callback)
 {
  mDelivery.post(new Runnable()
  {
   @Override
   public void run()
   {
    if (callback != null)
    {
     callback.onResponse(object);
    }
   }
  });
 }

 private Request buildPostRequest(String url, Param[] params)
 {
  if (params == null)
  {
   params = new Param[0];
  }
  FormEncodingBuilder builder = new FormEncodingBuilder();
  for (Param param : params)
  {
   builder.add(param.key, param.value);
  }
  RequestBody requestBody = builder.build();
  return new Request.Builder()
    .url(url)
    .post(requestBody)
    .build();
 }

 public static abstract class ResultCallback<T>
 {
  Type mType;

  public ResultCallback()
  {
   mType = getSuperclassTypeParameter(getClass());
  }

  static Type getSuperclassTypeParameter(Class<?> subclass)
  {
   Type superclass = subclass.getGenericSuperclass();
   if (superclass instanceof Class)
   {
    throw new RuntimeException("Missing type parameter.");
   }
   ParameterizedType parameterized = (ParameterizedType) superclass;
   return $Gson$Types.canonicalize(parameterized.getActualTypeArguments()[0]);
  }

  public abstract void onError(Request request, Exception e);

  public abstract void onResponse(T response);
 }

 public static class Param
 {
  public Param()
  {
  }

  public Param(String key, String value)
  {
   this.key = key;
   this.value = value;
  }

  String key;
  String value;
 }

}

源码地址：demo下载http://xiazai.jb51.net/201611/yuanma/okhttputils-master_jb51.zip
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持我们。