Android网络请求框架----okHttp3

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okhttp GitHub地址：
https://github.com/square/okhttp
最新的OkHttp依赖可以到官方的GitHub上去添加。

目前官方的依赖地址为：
compile ‘com.squareup.okhttp3:okhttp:3.6.0’

Get请求

直接进入主题：

        // 1、拿到OKHttpClient对象        OkHttpClient okHttpClient=new OkHttpClient();        // 2、构造Request        //Request是构造者模式，所以使用的时候要.Builder        Request.Builder builder=new Request.Builder();        Request reqyest=builder.get().url("http://www.baidu.com").build();        // 3、将Request封装为Call        Call call=okHttpClient.newCall(reqyest);        // 4、执行Call       /* Response response=call.execute();  //直接执行 需要抛出异常*/        call.enqueue(new Callback() {            @Override            public void onFailure(Call call, IOException e) {                //失败以后的方法            }            @Override            public void onResponse(Call call, Response response) throws IOException {                //成功以后回调的方法                String res=response.body().string(); //回调一个字符串            }        });

最后在Manifests中打开网络权限即可使用Get请求请求网络数据了。
get请求头的格式：
例： url+”login?username=chengdu&password=123456”

POST请求

post请求大体步骤和GET请求差不多，具体如代码所示

        //获得一个功能强大的FormBody表单        RequestBody formBody=new FormBody.Builder()                .build();        //2.构造Request        Request.Builder builder=new Request.Builder();        Request request=builder.url("http://www.imooc.com/").post(formBody).build();        // 3、将Request封装为Call        executeRequest(request);

RequestBody的数据格式都要指定Content-Type，常见的有三种：

application/x-www-form-urlencoded 数据是个普通表单
multipart/form-data 数据里有文件
application/json 数据是个json

之后还要加上 charset=utf-8

POST Json例子

    public void postJson(){        //获得一个FormBody表单        RequestBody requestBody=RequestBody.                create(MediaType.parse(                        "application/json;charset=utf-8"),"{Json字符串}");        //2.构造Request        Request.Builder builder=new Request.Builder();        Request request=builder.url("http://www.imooc.com/").post(requestBody).build();        // 3、将Request封装为Call        executeRequest(request);    }

POST 上传一个图片

    public void postFile(){        File file=new File(Environment.getExternalStorageDirectory(),"banana.jpg");        if (!file.exists()){            Log.e("-------","不存在");            return;        }        //获得一个FormBody表单        RequestBody requestBody=RequestBody.                create(MediaType.parse(                        "application/octet-stream; charset=utf-8"),file);        //2.构造Request        Request.Builder builder=new Request.Builder();        Request request=builder.url("http://www.imooc.com/").post(requestBody).build();        // 3、将Request封装为Call        executeRequest(request);    }

下载文件

    public void downloadFile(){        Request.Builder builder=new Request.Builder();        Request request=builder                .get()                .url("所要下载文件的文件路径")                .build();        Call call=okHttpClient.newCall(request);        call.enqueue(new Callback() {            @Override            public void onFailure(Call call, IOException e) {                //失败以后的方法                Log.e("----","失败以后的方法");            }            @Override            public void onResponse(Call call, Response response) throws IOException {                InputStream inputStream=response.body().byteStream();                int len=0;                File file=new File(Environment.getExternalStorageDirectory(), "zc.jpg");                byte[] buf =new byte[128];                FileOutputStream fos=new FileOutputStream(file);                while ((len= inputStream.read(buf))!=-1){                    fos.write(buf,0,len);                }                fos.flush();                fos.close();                inputStream.close();            }        });

下载图片并且设置

    //下载图片并且设置    public void downloadSetImage(){        Request.Builder builder=new Request.Builder();        Request request=builder                .get()                .url("所要下载文件的文件路径")                .build();        Call call=okHttpClient.newCall(request);        call.enqueue(new Callback() {            @Override            public void onFailure(Call call, IOException e) {                //失败以后的方法                Log.e("----","失败以后的方法");            }            @Override            public void onResponse(Call call, Response response) throws IOException {                InputStream inputStream=response.body().byteStream();                final Bitmap bitmap= BitmapFactory.decodeStream(inputStream);                runOnUiThread(new Runnable() {                    @Override                    public void run() {                        mImageView.setImageBitmap(bitmap);                    }                });            }        });    }

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