Java 获取远程文件大小

package com.company;

import java.net.URL;
import java.net.URLConnection;

/*
以下实例演示了如何获取远程文件的大小：

*/
public class UrlTest {

    public static void main(String[] args) throws Exception {
        int size;
        URL url = new URL("http://www.runoob.com/wp-content/themes/runoob/assets/img/newlogo.png");
        URLConnection conn = url.openConnection();
        size = conn.getContentLength();
        if (size < 0)
            System.out.println("无法获取文件大小。");
        else
            System.out.println("文件大小为：" + size + " bytes");
        conn.getInputStream().close();
    }
}