【小工具】Java獲取鏈接文件大小

/**
 * 獲取鏈接文件大小
 * 1M = 1048576 byte
 * 2M = 2097152 byte
 */
public class ImageSizeUtils {

    public static void main(String[] args) throws Exception {
        URL url = new URL("http://www.runoob.com/wp-content/themes/runoob/assets/img/newlogo.png");
        URLConnection conn = url.openConnection();
        int size = conn.getContentLength();
        System.out.println("文件大小爲：" + size + " bytes"); // 文件大小爲：4261 bytes
        conn.getInputStream().close();
    }
}