android 网络框架之okhttp3

1.在android studio配置

添加权限

<uses-permission android:name="android.permission.INTERNET"/>

gradle配置

compile 'com.squareup.okhttp3:okhttp:3.2.0'compile 'com.squareup.okio:okio:1.7.0'

2.异步get请求和post请求

get请求

private void getAsynOkHttp() {    mOkHttpClient=new OkHttpClient();    Request.Builder requestBuilder = new Request.Builder().url("http://www.baidu.com");    //默认是GET请求，可以省略    requestBuilder.method("GET",null);    Request request = requestBuilder.build();    Call mcall= mOkHttpClient.newCall(request);    mcall.enqueue(new Callback() {        @Override        public void onFailure(Call call, IOException e) { }        @Override        public void onResponse(Call call, Response response) throws IOException {            if (null != response.cacheResponse()) {                String str = response.cacheResponse().toString();                Log.i("haookhttp", "cache---" + str);            } else {                response.body().string();                String str = response.networkResponse().toString();                Log.i("haookhttp", "network---" + str);            }            runOnUiThread(new Runnable() {                @Override                public void run() {                    Toast.makeText(getApplicationContext(), "hao请求成功", Toast.LENGTH_SHORT).show();                }            });        }    });}

post请求

private void postAsynOkHttp() {     mOkHttpClient=new OkHttpClient();     RequestBody formBody = new FormBody.Builder()             .add("size", "10")             .build();     Request request = new Request.Builder()             .url("http://www.baidu.com")             .post(formBody)             .build();     Call call = mOkHttpClient.newCall(request);     call.enqueue(new Callback() {         @Override         public void onFailure(Call call, IOException e) {}         @Override         public void onResponse(Call call, Response response) throws IOException {             String str = response.body().string();             Log.i("hao", str);             runOnUiThread(new Runnable() {                 @Override                 public void run() {                     Toast.makeText(getApplicationContext(), "hao请求成功", Toast.LENGTH_SHORT).show();                 }             });         }     }); }

3.异步上传文件
添加权限

<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/><uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>

定义上传文件类型

public static final MediaType MEDIA_TYPE_MARKDOWN        = MediaType.parse("text/x-markdown; charset=utf-8");

private void postAsynFile() {    mOkHttpClient=new OkHttpClient();    File file = new File("/sdcard/text.txt");    Request request = new Request.Builder()            .url("https://api.github.com/raw")            .post(RequestBody.create(MEDIA_TYPE_MARKDOWN, file))            .build();        mOkHttpClient.newCall(request).enqueue(new Callback() {            @Override            public void onFailure(Call call, IOException e) {  }            @Override            public void onResponse(Call call, Response response) throws IOException {                Log.i("hao",response.body().string());            }        });    }

如果想要改为同步的上传文件只要调用 mOkHttpClient.newCall(request).execute()就可以了。
4.异步下载文件

private void downAsynFile() {     mOkHttpClient = new OkHttpClient();     String url = "http://img.my.csdn.net/uploads/201705/17/1_01.jpg";     Request request = new Request.Builder().url(url).build();     mOkHttpClient.newCall(request).enqueue(new Callback() {         @Override         public void onFailure(Call call, IOException e) { }         @Override         public void onResponse(Call call, Response response) {             InputStream inputStream = response.body().byteStream();             FileOutputStream fileOutputStream = null;             try {                 fileOutputStream = new FileOutputStream(new File("/sdcard/hao.jpg"));                 byte[] buffer = new byte[2048];                 int len = 0;                 while ((len = inputStream.read(buffer)) != -1) {                     fileOutputStream.write(buffer, 0, len);                 }                 fileOutputStream.flush();             } catch (IOException e) {                 e.printStackTrace();            }            Log.d("hao", "文件下载成功");        }    });}

5.异步上传Multipart文件
定义上传文件类型

private static final MediaType MEDIA_TYPE_PNG = MediaType.parse("image/png");

private void sendOkhttpMultipart(){    mOkHttpClient = new OkHttpClient();    RequestBody requestBody = new MultipartBody.Builder()            .setType(MultipartBody.FORM)            .addFormDataPart("title", "hao")            .addFormDataPart("image", "hao.jpg",                    RequestBody.create(MEDIA_TYPE_PNG, new File("/sdcard/hao.jpg")))            .build();    Request request = new Request.Builder()            .header("Authorization", "Client-ID " + "...")            .url("https://api.github.com/raw")            .post(requestBody)            .build();   mOkHttpClient.newCall(request).enqueue(new Callback() {       @Override       public void onFailure(Call call, IOException e) { }       @Override       public void onResponse(Call call, Response response) throws IOException {           Log.i("hao", response.body().string());       }   });}

6.设置缓存和超时时间
okHttp3和OkHttp2.x有区别的是不能通过OkHttpClient直接设置超时时间和缓存了，而是通过OkHttpClient.Builder来设置，通过builder配置好OkHttpClient后用builder.build()来返回OkHttpClient，所以我们通常不会调用new OkHttpClient()来得到OkHttpClient，而是通过builder.build()，如下：

File sdcache = getExternalCacheDir();int cacheSize = 10 * 1024 * 1024;OkHttpClient.Builder builder = new OkHttpClient.Builder()        .connectTimeout(15, TimeUnit.SECONDS)        .writeTimeout(20, TimeUnit.SECONDS)        .readTimeout(20, TimeUnit.SECONDS)        .cache(new Cache(sdcache.getAbsoluteFile(), cacheSize));OkHttpClient mOkHttpClient=builder.build();

7.取消请求和封装

call.cancel()，