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