Java如何从服务器获取文件大小？

在Java编程中，如何从服务器获取文件大小？

以下示例演示如何从服务器获取文件大小。

package com.yiibai;

import java.net.URL;

import java.net.URLConnection;

public class GettingFileSize {

    public static void main(String[] argv) throws Exception {

        int size;

        URL url = new URL("http://www.yiibai.com/downloads/host.txt");

        URLConnection conn = url.openConnection();

        size = conn.getContentLength();

        if (size < 0)

            System.out.println("Could not determine file size.");

        else

            System.out.println("The size of file is = " + size + " bytes");

        conn.getInputStream().close();

    }

}

Java

上述代码示例将产生以下结果 -

The size of file is = 180822 bytes

Shell

示例-2

以下是如何从服务器获取文件大小的另一个示例。

package com.yiibai;

import java.net.URL;

import java.net.URLConnection;

public class GettingFileSize2 {

    public static void main(String[] argv) throws Exception {

        int size;

        URL url = new URL("http://www.yiibai.com/downloads/yiibaidb.zip");

        URLConnection conn = url.openConnection();

        size = conn.getContentLength();

        if (size < 0)

            System.out.println("file size is empty.");

        else

            System.out.println("File size is = " + size + " bytes");

        conn.getInputStream().close();

    }

}

Java

上述代码示例将产生以下结果 -

File size is = 60098 bytes