Okhttp进行文件的下载

服务器端有所需要下载的文件，图片或者文本，直接进行请求，可以从response获得服务器返回的流

1.

case R.id.button_activity7_2:

verifyStoragePermissions(MainActivity7.this);
downloadFile("http://192.168.1.8:8080/com.lianggao.whut/images/5.jpg");
break;

//
private void downloadFile(final String url){
        new Thread(){
            public void run(){
                download(url);
            }
        }.start();
    }

    //下载
    public   void download( final String url){
        final long startTime = System.currentTimeMillis();
        Log.i("DOWNLOAD","startTime="+startTime);
        Request request = new Request.Builder().url(url).build();
        client.newCall(request).enqueue(new Callback() {
            @Override
            public void onFailure(Call call, IOException e) {
                // 下载失败
                e.printStackTrace();
                Log.i("DOWNLOAD","download failed");
            }
            @Override
            public void onResponse(Call call, Response response) throws IOException {
                Sink sink = null;
                BufferedSink bufferedSink = null;
                try {
                    String mSDCardPath= Environment.getExternalStorageDirectory().getAbsolutePath();//SD卡路径
                    String appPath= getApplicationContext().getFilesDir().getAbsolutePath();//此APP的files路径
                    Log.i("DOWNLOAD",appPath);
                    File dest = new File(appPath,url.substring(url.lastIndexOf("/") + 1));
                    sink = Okio.sink(dest);
                    bufferedSink = Okio.buffer(sink);
                    /*InputStream is=response.body().byteStream();
                    if (is != null) {
                        FileOutputStream fileOutputStream = new FileOutputStream(dest);//指定文件保存路径，代码看下一步
                        byte[] buf = new byte[1024];
                        int ch;
                        while ((ch = is.read(buf)) != -1) {
                            System.out.println("@@@@@@@@@@@@@"+ch);
                            fileOutputStream.write(buf, 0, ch);//将获取到的流写入文件中
                        }
                    }*/
                    //Log.i("DOWNLOADddddd",is.toString());


                    bufferedSink.writeAll(response.body().source());
                    Log.i("DOWNLOAD",response.body().source().toString());
                    bufferedSink.close();
                    Log.i("DOWNLOAD","download success");
                    Log.i("DOWNLOAD","totalTime="+ (System.currentTimeMillis() - startTime));
                } catch (Exception e) {
                    e.printStackTrace();
                    Log.i("DOWNLOAD","download failed");
                } finally {
                    if(bufferedSink != null){
                        bufferedSink.close();
                    }
                }
            }
        });
    }

2.服务器资源要放在webapp下面

3.

https://blog.csdn.net/suyimin2010/article/details/81270470