okhttp的简介（二）之简单封装

• 前一篇文章简单的介绍了okhttp的简单使用。okhttp的简介（一）：http://blog.csdn.net/wuyinlei/article/details/50579564
  相信使用还是非常好使用的。

• 可是，怎么说呢，我们应该不想，每次使用的时候都去又一次写一遍代码，或者是复制代码，这样不仅或降低效率，并且还会是代码冗余。

• 这个时候。採用封装就能够解决我们的问题了，把同样的代码，封装到一起，对外提供一个调用的接口。每次调用的时候。我们仅仅须要调用接口，传入数据。就能够了，我们全然不用去理会他内部逻辑是怎么处理的
• 那好的，既然已经知道了怎么去做，那么我们就開始吧。

我们想要实现的结果：

//在这里我们直接调用暴露出来的接口。传入须要的參数，即可了。降低了代码量 OkHttpManager.getAsync(Contants.ASYNC_URL, new OkHttpManager.DataCallBack() { ???????????@Override ???????????public void requestFailure(Request request, IOException e) { ???????????} ???????????@Override ???????????public void requestSuccess(String result) throws Exception { ???????????//在这里我们能够直接去赋值，由于我们在内部已经做了异步处理。不用操心在子线程中获取数据，然后在UI线程中更改UI了。 ???????????????tvtext.setText(result); ???????????}

1、Okhttp的单例实现以及配置

 ???/** ????* 静态实例 ????*/ ???private static OkHttpManager sOkHttpManager; ???/** ????* okhttpclient实例 ????*/ ???private OkHttpClient mClient; ???/** ????* 单例模式 ?获取OkHttpManager实例 ????* ????* @return ????*/ ???public static OkHttpManager getInstance() { ???????if (sOkHttpManager == null) { ???????????sOkHttpManager = new OkHttpManager(); ???????} ???????return sOkHttpManager; ???} ???/** ????* 构造方法 ????*/ ???private OkHttpManager() { ???????mClient = new OkHttpClient(); ???????/** ????????* 在这里直接设置连接超时.读取超时，写入超时 ????????*/ ???????mClient.newBuilder().connectTimeout(10, TimeUnit.SECONDS); ???????mClient.newBuilder().readTimeout(10, TimeUnit.SECONDS); ???????mClient.newBuilder().writeTimeout(10, TimeUnit.SECONDS);}

对外提供GET同步请求和内部逻辑处理

 ???/** ????* 对外提供的get方法,同步的方式 ????* ????* @param url 传入的地址 ????* @return ????*/ ???public static Response getSync(String url) { ???????//通过获取到的实例来调用内部方法 ???????return sOkHttpManager.inner_getSync(url); ???} ???/** ????* GET方式请求的内部逻辑处理方式，同步的方式 ????* ????* @param url ????* @return ????*/ ???private Response inner_getSync(String url) { ???????Request request = new Request.Builder().url(url).build(); ???????Response response = null; ???????try { ???????????//同步请求返回的是response对象 ???????????response = mClient.newCall(request).execute(); ???????} catch (IOException e) { ???????????e.printStackTrace(); ???????} ???????return response; ???}

3、对外提供的同步获取数据的方法和内部处理

 /** ????* 对外提供的同步获取String的方法 ????* ????* @param url ????* @return ????*/ ???public static String getSyncString(String url) { ???????return sOkHttpManager.inner_getSyncString(url); ???} ???/** ????* 同步方法 ????*/ ???private String inner_getSyncString(String url) { ???????String result = null; ???????try { ???????????/** ????????????* 把取得到的结果转为字符串，这里最好用string() ????????????*/ ???????????result = inner_getSync(url).body().string(); ???????} catch (IOException e) { ???????????e.printStackTrace(); ???????} ???????return result; ???}

4、异步请求做的处理

• 在这里我们对回调Callback进行了处理。改成我们自己定义的接口

 /** ????* 数据回调接口 ????*/ ???public interface DataCallBack { ???????//请求失败 ???????void requestFailure(Request request, IOException e); ???????//请求成功 ???????void requestSuccess(String result) throws Exception; ???}

然后自己定义了两个方法

• 一个是请求失败：

/** ????* 分发失败的时候调用 ????* ????* @param request ????* @param e ????* @param callBack ????*/ ???private void deliverDataFailure(final Request request, final IOException e, final DataCallBack callBack) { ???????/** ????????* 在这里使用异步处理 ????????*/ ???????mHandler.post(new Runnable() { ???????????@Override ???????????public void run() { ???????????????if (callBack != null) { ???????????????????callBack.requestFailure(request, e); ???????????????} ???????????} ???????}); ???}

一个是请求成功：

 ???/** ????* 分发成功的时候调用 ????* ????* @param result ????* @param callBack ????*/ ???private void deliverDataSuccess(final String result, final DataCallBack callBack) { ???????/** ????????* 在这里使用异步线程处理 ????????*/ ???????mHandler.post(new Runnable() { ???????????@Override ???????????public void run() { ???????????????if (callBack != null) { ???????????????????try { ???????????????????????callBack.requestSuccess(result); ???????????????????} catch (Exception e) { ???????????????????????e.printStackTrace(); ???????????????????} ???????????????} ???????????} ???????}); ???}

5、异步请求逻辑处理

//-------------------------异步的方式请求数据-------------------------- ???public static void getAsync(String url, DataCallBack callBack) { ???????getInstance().inner_getAsync(url, callBack); ???} ???/** ????* 内部逻辑请求的方法 ????* ????* @param url ????* @param callBack ????* @return ????*/ ???private void inner_getAsync(String url, final DataCallBack callBack) { ???????final Request request = new Request.Builder().url(url).build(); ???????mClient.newCall(request).enqueue(new Callback() { ???????????@Override ???????????public void onFailure(Call call, IOException e) { ???????????????deliverDataFailure(request, e, callBack); ???????????} ???????????@Override ???????????public void onResponse(Call call, Response response) throws IOException { ???????????????String result = null; ???????????????try { ???????????????????result = response.body().string(); ???????????????} catch (IOException e) { ???????????????????deliverDataFailure(request, e, callBack); ???????????????} ???????????????deliverDataSuccess(result, callBack); ???????????} ???????}); ???}

6、表单提交逻辑处理

 //-------------------------提交表单-------------------------- ???public static void postAsync(String url, Map<String, String> params, DataCallBack callBack) { ???????getInstance().inner_postAsync(url, params, callBack); ???} ???private void inner_postAsync(String url, Map<String, String> params, final DataCallBack callBack) { ???????RequestBody requestBody = null; ???????if (params == null) { ???????????params = new HashMap<>(); ???????} ???????/** ????????* 假设是3.0之前版本号的，构建表单数据是以下的一句 ????????*/ ???????//FormEncodingBuilder builder = new FormEncodingBuilder(); ???????/** ????????* 3.0之后版本号 ????????*/ ???????FormBody.Builder builder = new FormBody.Builder(); ???????/** ????????* 在这对加入的參数进行遍历，map遍历有四种方式。假设想要了解的能够网上查找 ????????*/ ???????for (Map.Entry<String, String> map : params.entrySet()) { ???????????String key = map.getKey().toString(); ???????????String value = null; ???????????/** ????????????* 推断值是否是空的 ????????????*/ ???????????if (map.getValue() == null) { ???????????????value = ""; ???????????} else { ???????????????value = map.getValue(); ???????????} ???????????/** ????????????* 把key和value加入到formbody中 ????????????*/ ???????????builder.add(key, value); ???????} ???????requestBody = builder.build(); ???????//结果返回 ???????final Request request = new Request.Builder().url(url).post(requestBody).build(); ???????mClient.newCall(request).enqueue(new Callback() { ???????????@Override ???????????public void onFailure(Call call, IOException e) { ???????????????deliverDataFailure(request, e, callBack); ???????????} ???????????@Override ???????????public void onResponse(Call call, Response response) throws IOException { ???????????????String result = response.body().string(); ???????????????deliverDataSuccess(result, callBack); ???????????} ???????}); ???}

7、文件下载逻辑处理

 ???//-------------------------文件下载-------------------------- ???public static void downloadAsync(String url, String desDir, DataCallBack callBack) { ???????getInstance().inner_downloadAsync(url, desDir, callBack); ???} ???/** ????* 下载文件的内部逻辑处理类 ????* ????* @param url ?????下载地址 ????* @param desDir ??目标地址 ????* @param callBack ????*/ ???private void inner_downloadAsync(final String url, final String desDir, final DataCallBack callBack) { ???????final Request request = new Request.Builder().url(url).build(); ???????mClient.newCall(request).enqueue(new Callback() { ???????????@Override ???????????public void onFailure(Call call, IOException e) { ???????????????deliverDataFailure(request, e, callBack); ???????????} ???????????@Override ???????????public void onResponse(Call call, Response response) throws IOException { ???????????????/** ????????????????* 在这里进行文件的下载处理 ????????????????*/ ???????????????InputStream inputStream = null; ???????????????FileOutputStream fileOutputStream = null; ???????????????try { ???????????????????//文件名称和目标地址 ???????????????????File file = new File(desDir, getFileName(url)); ???????????????????//把请求回来的response对象装换为字节流 ???????????????????inputStream = response.body().byteStream(); ???????????????????fileOutputStream = new FileOutputStream(file); ???????????????????int len = 0; ???????????????????byte[] bytes = new byte[2048]; ???????????????????//循环读取数据 ???????????????????while ((len = inputStream.read(bytes)) != -1) { ???????????????????????fileOutputStream.write(bytes, 0, len); ???????????????????} ???????????????????//关闭文件输出流 ???????????????????fileOutputStream.flush(); ???????????????????//调用分发数据成功的方法 ???????????????????deliverDataSuccess(file.getAbsolutePath(), callBack); ???????????????} catch (IOException e) { ???????????????????//假设失败。调用此方法 ???????????????????deliverDataFailure(request, e, callBack); ???????????????????e.printStackTrace(); ???????????????} finally { ???????????????????if (inputStream != null) { ???????????????????????inputStream.close(); ???????????????????} ???????????????????if (fileOutputStream != null) { ???????????????????????fileOutputStream.close(); ???????????????????} ???????????????} ???????????} ???????}); ???} ???/** ????* 依据文件url获取文件的路径名字 ????* ????* @param url ????* @return ????*/ ???private String getFileName(String url) { ???????int separatorIndex = url.lastIndexOf("/"); ???????????????String path = (separatorIndex < 0) ? url : url.substring(separatorIndex + 1, url.length()); ???????return path; ???}

实现效果是一样的，可是代码结构清晰很多哈：

这样，就完毕了简单的一个请求工具类的封装。

这里的异步请求处理。我仅仅是返回了字符串。假设想返回的直接是个对象，这个还得须要处理。在这由于知识尚浅，尚不能完毕对象的返回。我们看到上面的，事实上也就是遵循了okhttp的GET。POST请求的逻辑。在次基础上，我们添加了一些方法，来完毕我们想要的功能。以下上传代码。有点多，大家担待点哈：

package com.example.okhttpdemo;import android.os.Handler;import android.os.Looper;import java.io.File;import java.io.FileOutputStream;import java.io.IOException;import java.io.InputStream;import java.util.HashMap;import java.util.Map;import java.util.concurrent.TimeUnit;import okhttp3.Call;import okhttp3.Callback;import okhttp3.FormBody;import okhttp3.OkHttpClient;import okhttp3.Request;import okhttp3.RequestBody;import okhttp3.Response;/** * Created by 若兰 on 2016/1/23. * 一个懂得了编程乐趣的小白。希望自己 * 能够在这个道路上走的非常远，也希望自己学习到的 * 知识能够帮助很多其它的人,分享就是学习的一种乐趣 * QQ:1069584784 * csdn:http://blog.csdn.net/wuyinlei */public class OkHttpManager { ???/** ????* 静态实例 ????*/ ???private static OkHttpManager sOkHttpManager; ???/** ????* okhttpclient实例 ????*/ ???private OkHttpClient mClient; ???/** ????* 由于我们请求数据一般都是子线程中请求，在这里我们使用了handler ????*/ ???private Handler mHandler; ???/** ????* 构造方法 ????*/ ???private OkHttpManager() { ???????mClient = new OkHttpClient(); ???????/** ????????* 在这里直接设置连接超时.读取超时。写入超时 ????????*/ ???????mClient.newBuilder().connectTimeout(10, TimeUnit.SECONDS); ???????mClient.newBuilder().readTimeout(10, TimeUnit.SECONDS); ???????mClient.newBuilder().writeTimeout(10, TimeUnit.SECONDS); ???????/** ????????* 假设是用的3.0之前的版本号 ?使用以下直接设置连接超时.读取超时，写入超时 ????????*/ ???????//client.setConnectTimeout(10, TimeUnit.SECONDS); ???????//client.setWriteTimeout(10, TimeUnit.SECONDS); ???????//client.setReadTimeout(30, TimeUnit.SECONDS); ???????/** ????????* 初始化handler ????????*/ ???????mHandler = new Handler(Looper.getMainLooper()); ???} ???/** ????* 单例模式 ?获取OkHttpManager实例 ????* ????* @return ????*/ ???public static OkHttpManager getInstance() { ???????if (sOkHttpManager == null) { ???????????sOkHttpManager = new OkHttpManager(); ???????} ???????return sOkHttpManager; ???} ???//-------------------------同步的方式请求数据-------------------------- ???/** ????* 对外提供的get方法,同步的方式 ????* ????* @param url 传入的地址 ????* @return ????*/ ???public static Response getSync(String url) { ???????//通过获取到的实例来调用内部方法 ???????return sOkHttpManager.inner_getSync(url); ???} ???/** ????* GET方式请求的内部逻辑处理方式，同步的方式 ????* ????* @param url ????* @return ????*/ ???private Response inner_getSync(String url) { ???????Request request = new Request.Builder().url(url).build(); ???????Response response = null; ???????try { ???????????//同步请求返回的是response对象 ???????????response = mClient.newCall(request).execute(); ???????} catch (IOException e) { ???????????e.printStackTrace(); ???????} ???????return response; ???} ???/** ????* 对外提供的同步获取String的方法 ????* ????* @param url ????* @return ????*/ ???public static String getSyncString(String url) { ???????return sOkHttpManager.inner_getSyncString(url); ???} ???/** ????* 同步方法 ????*/ ???private String inner_getSyncString(String url) { ???????String result = null; ???????try { ???????????/** ????????????* 把取得到的结果转为字符串，这里最好用string() ????????????*/ ???????????result = inner_getSync(url).body().string(); ???????} catch (IOException e) { ???????????e.printStackTrace(); ???????} ???????return result; ???} ???//-------------------------异步的方式请求数据-------------------------- ???public static void getAsync(String url, DataCallBack callBack) { ???????getInstance().inner_getAsync(url, callBack); ???} ???/** ????* 内部逻辑请求的方法 ????* ????* @param url ????* @param callBack ????* @return ????*/ ???private void inner_getAsync(String url, final DataCallBack callBack) { ???????final Request request = new Request.Builder().url(url).build(); ???????mClient.newCall(request).enqueue(new Callback() { ???????????@Override ???????????public void onFailure(Call call, IOException e) { ???????????????deliverDataFailure(request, e, callBack); ???????????} ???????????@Override ???????????public void onResponse(Call call, Response response) throws IOException { ???????????????String result = null; ???????????????try { ???????????????????result = response.body().string(); ???????????????} catch (IOException e) { ???????????????????deliverDataFailure(request, e, callBack); ???????????????} ???????????????deliverDataSuccess(result, callBack); ???????????} ???????}); ???} ???/** ????* 分发失败的时候调用 ????* ????* @param request ????* @param e ????* @param callBack ????*/ ???private void deliverDataFailure(final Request request, final IOException e, final DataCallBack callBack) { ???????/** ????????* 在这里使用异步处理 ????????*/ ???????mHandler.post(new Runnable() { ???????????@Override ???????????public void run() { ???????????????if (callBack != null) { ???????????????????callBack.requestFailure(request, e); ???????????????} ???????????} ???????}); ???} ???/** ????* 分发成功的时候调用 ????* ????* @param result ????* @param callBack ????*/ ???private void deliverDataSuccess(final String result, final DataCallBack callBack) { ???????/** ????????* 在这里使用异步线程处理 ????????*/ ???????mHandler.post(new Runnable() { ???????????@Override ???????????public void run() { ???????????????if (callBack != null) { ???????????????????try { ???????????????????????callBack.requestSuccess(result); ???????????????????} catch (Exception e) { ???????????????????????e.printStackTrace(); ???????????????????} ???????????????} ???????????} ???????}); ???} ???/** ????* 数据回调接口 ????*/ ???public interface DataCallBack { ???????void requestFailure(Request request, IOException e); ???????void requestSuccess(String result) throws Exception; ???} ???//-------------------------提交表单-------------------------- ???public static void postAsync(String url, Map<String, String> params, DataCallBack callBack) { ???????getInstance().inner_postAsync(url, params, callBack); ???} ???private void inner_postAsync(String url, Map<String, String> params, final DataCallBack callBack) { ???????RequestBody requestBody = null; ???????if (params == null) { ???????????params = new HashMap<>(); ???????} ???????/** ????????* 假设是3.0之前版本号的，构建表单数据是以下的一句 ????????*/ ???????//FormEncodingBuilder builder = new FormEncodingBuilder(); ???????/** ????????* 3.0之后版本号 ????????*/ ???????FormBody.Builder builder = new FormBody.Builder(); ???????/** ????????* 在这对加入的參数进行遍历，map遍历有四种方式，假设想要了解的能够网上查找 ????????*/ ???????for (Map.Entry<String, String> map : params.entrySet()) { ???????????String key = map.getKey().toString(); ???????????String value = null; ???????????/** ????????????* 推断值是否是空的 ????????????*/ ???????????if (map.getValue() == null) { ???????????????value = ""; ???????????} else { ???????????????value = map.getValue(); ???????????} ???????????/** ????????????* 把key和value加入到formbody中 ????????????*/ ???????????builder.add(key, value); ???????} ???????requestBody = builder.build(); ???????//结果返回 ???????final Request request = new Request.Builder().url(url).post(requestBody).build(); ???????mClient.newCall(request).enqueue(new Callback() { ???????????@Override ???????????public void onFailure(Call call, IOException e) { ???????????????deliverDataFailure(request, e, callBack); ???????????} ???????????@Override ???????????public void onResponse(Call call, Response response) throws IOException { ???????????????String result = response.body().string(); ???????????????deliverDataSuccess(result, callBack); ???????????} ???????}); ???} ???//-------------------------文件下载-------------------------- ???public static void downloadAsync(String url, String desDir, DataCallBack callBack) { ???????getInstance().inner_downloadAsync(url, desDir, callBack); ???} ???/** ????* 下载文件的内部逻辑处理类 ????* ????* @param url ?????下载地址 ????* @param desDir ??目标地址 ????* @param callBack ????*/ ???private void inner_downloadAsync(final String url, final String desDir, final DataCallBack callBack) { ???????final Request request = new Request.Builder().url(url).build(); ???????mClient.newCall(request).enqueue(new Callback() { ???????????@Override ???????????public void onFailure(Call call, IOException e) { ???????????????deliverDataFailure(request, e, callBack); ???????????} ???????????@Override ???????????public void onResponse(Call call, Response response) throws IOException { ???????????????/** ????????????????* 在这里进行文件的下载处理 ????????????????*/ ???????????????InputStream inputStream = null; ???????????????FileOutputStream fileOutputStream = null; ???????????????try { ???????????????????//文件名称和目标地址 ???????????????????File file = new File(desDir, getFileName(url)); ???????????????????//把请求回来的response对象装换为字节流 ???????????????????inputStream = response.body().byteStream(); ???????????????????fileOutputStream = new FileOutputStream(file); ???????????????????int len = 0; ???????????????????byte[] bytes = new byte[2048]; ???????????????????//循环读取数据 ???????????????????while ((len = inputStream.read(bytes)) != -1) { ???????????????????????fileOutputStream.write(bytes, 0, len); ???????????????????} ???????????????????//关闭文件输出流 ???????????????????fileOutputStream.flush(); ???????????????????//调用分发数据成功的方法 ???????????????????deliverDataSuccess(file.getAbsolutePath(), callBack); ???????????????} catch (IOException e) { ???????????????????//假设失败。调用此方法 ???????????????????deliverDataFailure(request, e, callBack); ???????????????????e.printStackTrace(); ???????????????} finally { ???????????????????if (inputStream != null) { ???????????????????????inputStream.close(); ???????????????????} ???????????????????if (fileOutputStream != null) { ???????????????????????fileOutputStream.close(); ???????????????????} ???????????????} ???????????} ???????}); ???} ???/** ????* 依据文件url获取文件的路径名字 ????* ????* @param url ????* @return ????*/ ???private String getFileName(String url) { ???????int separatorIndex = url.lastIndexOf("/"); ???????String path = (separatorIndex < 0) ? url : url.substring(separatorIndex + 1, url.length()); ???????return path; ???}}