在網(wǎng)上一頓找。。。。這個(gè)親測(cè)可用。

import java.io.IOException;
import java.net.URL;
import java.net.URLConnection;

//返回遠(yuǎn)程文件大小單位MB
    public static double getRemoteFileSize(String url) {
        int file_size = 0;
        try {
            URL u = new URL(url);
            URLConnection urlConnection = u.openConnection();
            urlConnection.connect();
            file_size = urlConnection.getContentLength();
        } catch (IOException e) {
            return 0;
        }
        return file_size / Math.pow(2, 20);
    }