okhttp上传下载图片

public class MainActivity extends AppCompatActivity {

private String Path = "https://10.url.cn/eth/ajNVdqHZLLAxibwnrOxXSzIxA76ichutwMCcOpA45xjiapneMZsib7eY4wUxF6XDmL2FmZEVYsf86iaw/";
private static final int SUCCESS = 993;
private static final int FALL = 814;
Handler handler = new Handler() {
    @Override
    public void handleMessage(Message msg) {
        switch (msg.what) {
            //加载网络成功,进行UI的更新,处理得到的图片资源
            case SUCCESS:
                //通过message,拿到字节数组
                byte[] Picture = (byte[]) msg.obj;
                //使用BitmapFactory工厂,把字节数组转换为bitmap
                Bitmap bitmap = BitmapFactory.decodeByteArray(Picture, 0, Picture.length);
                //通过ImageView,设置图片
                mImageView_okhttp.setImageBitmap(bitmap);
                break;
            //当加载网络失败,执行的逻辑代码
            case FALL:
                Toast.makeText(MainActivity.this, "不好意思,李红展太帅了,造成网络异常", Toast.LENGTH_SHORT).show();
                break;

            default:
                break;
        }
    }
};
private ImageView mImageView_okhttp;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    //初始化控件
    initView();
}

private void initView() {
    mImageView_okhttp = (ImageView) findViewById(R.id.imageView_okhttp);
}

/**
 * 根据点击事件获取络上的图片资源,使用的是OKhttp框架
 *
 * @param view
 */
public void Picture_okhttp_bt(View view) {
    //1. 创建OKhttpClient对象
    OkHttpClient okHttpClient = new OkHttpClient();
    //2.建立Request对象,设置参数,请求方式如果是get,就不用设置,默认使用的就是get
    Request request = new Request.Builder()
            .url(Path)//设置请求网址
            .build();//建立request对象
    //3.创建一个Call对象,参数是request对象,发送请求
    Call call = okHttpClient.newCall(request);
    //4.异步请求,请求加入调度
    call.enqueue(new Callback() {
        @Override//请求失败回调
        public void onFailure(Call call, IOException e) {
            handler.sendEmptyMessage(FALL);
        }

        @Override//请求成功回调
        public void onResponse(Call call, Response response) throws IOException {
            //得到从网上获取资源,转换成我们想要的类型
            byte[] Picture_bt = response.body().bytes();
            //通过handler更新UI
            Message message = handler.obtainMessage();
            message.obj = Picture_bt;
            message.what = SUCCESS;
            handler.sendMessage(message);

        }
    });
}

//当按钮点击时,执行使用OKhttp上传图片到服务器(http://blog.csdn.net/tangxl2008008/article/details/51777355)
//注意:有时候上传图片失败,是服务器规定还要上传一个Key,如果开发中关于网络这一块出现问题,就多和面试官沟通沟通
public void uploading(View view) {
    //图片上传接口地址
    String url = "https://www.718shop.com/sell/sell.m.picture.upload.do";
    //创建上传文件对象
    File file = new File(Environment.getExternalStorageDirectory(), "big.jpg");

    //创建RequestBody封装参数
    RequestBody fileBody = RequestBody.create(MediaType.parse("application/octet-stream"), file);
    //创建MultipartBody,给RequestBody进行设置
    MultipartBody multipartBody = new MultipartBody.Builder()
            .setType(MultipartBody.FORM)
            .addFormDataPart("image", "big.jpg", fileBody)
            .build();
    //创建Request
    Request request = new Request.Builder()
            .url(url)
            .post(multipartBody)
            .build();

    //创建okhttp对象
    OkHttpClient okHttpClient = new OkHttpClient.Builder()
            .connectTimeout(10, TimeUnit.SECONDS)
            .readTimeout(10, TimeUnit.SECONDS)
            .writeTimeout(10, TimeUnit.SECONDS)
            .build();

    //上传完图片,得到服务器反馈数据
    okHttpClient.newCall(request).enqueue(new Callback() {
        @Override
        public void onFailure(Call call, IOException e) {
            Log.e("hao", "uploadMultiFile() e=" + e);
        }

        @Override
        public void onResponse(Call call, Response response) throws IOException {
            Log.i("hao", "成功了=" + response.body().string());
        }
    });


}

}