如何在Java中使用okhttpclient下载图像文件

image download java okhttp

2022-09-01 18:44:08

我想问如何在Java中使用okhttpclient下载图像文件，因为我需要使用会话下载文件。
这是官方给出的代码，但我不知道如何使用它作为图像文件下载。

private final OkHttpClient client = new OkHttpClient();

  public void run() throws Exception {
    Request request = new Request.Builder()
        .url("http://publicobject.com/helloworld.txt")
        .build();

    Response response = client.newCall(request).execute();
    if (!response.isSuccessful()) throw new IOException("Unexpected code " + response);

    Headers responseHeaders = response.headers();
    for (int i = 0; i < responseHeaders.size(); i++) {
      System.out.println(responseHeaders.name(i) + ": " + responseHeaders.value(i));
    }

    System.out.println(response.body().string());
  }

答案 1

试试这样的东西

InputStream inputStream = response.body().byteStream();
Bitmap bitmap = BitmapFactory.decodeStream(inputStream);

答案 2

也许回答这个问题有点晚了，但它可能会在未来帮助某人。我更喜欢总是在后台下载照片，要使用OkHttpClient这样做，你应该使用回调：

    final Request request = new Request.Builder().url(url).build();
    okHttpClient.newCall(request).enqueue(new Callback() {
                @Override
                public void onFailure(Call call, IOException e) {
                    //Handle the error
                }

                @Override
                public void onResponse(Call call, Response response) throws IOException {
                    if (response.isSuccessful()){
                        final Bitmap bitmap = BitmapFactory.decodeStream(response.body().byteStream());
                       // Remember to set the bitmap in the main thread.
                        new Handler(Looper.getMainLooper()).post(new Runnable() {
                                @Override
                                public void run() {
                                    imageView.setImageBitmap(image);
                                }
                            });
                    }else {
                        //Handle the error
                    }
                }
            });