Okhttp检查文件大小而不下载文件 [英] Okhttp check file size without dowloading the file

问题描述

okhttp的常见示例涵盖了get和post的场景.

The common examples for okhttp cover the scenarios of get and post.

但是我需要获取带有url的文件的文件大小.由于我需要通知用户，只有在获得他们的批准后才能下载文件.

But I need to get the file size of a file with a url. Since I need to inform the the user, and only after getting their approval to download the file.

当前我正在使用此代码

URL url = new URL("http://server.com/file.mp3");
URLConnection urlConnection = url.openConnection();
urlConnection.connect();
int file_size = urlConnection.getContentLength();

在此stackoverflow问题中提到如何在下载文件之前知道文件的大小吗?

mentioned in this stackoverflow question How to know the size of a file before downloading it?

这是可行的，但是当我在项目中使用okhttp进行其他get请求时，我也希望在这种情况下使用它.

Which works but as I am using okhttp in my project for other get requests I was hoping to use it for this scenario also.

推荐答案

public static long getRemoteFileSize(String url) {
    OkHttpClient client = new OkHttpClient();
    // get only the head not the whole file
    Request request = new Request.Builder().url(url).head().build();
    Response response=null;
    try {
        response = client.newCall(request).execute();
        // OKHTTP put the length from the header here even though the body is empty 
        long size = response.body().contentLength();
        response.close();
        return  size;
    } catch (IOException e) {
        if (response!=null) {
            response.close();

        }
        e.printStackTrace();
    }
    return 0;

}

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