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();
    }
}

上述代码示例将产生以下结果 -

The size of file is = 180822 bytes

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();
    }
}

上述代码示例将产生以下结果 -

File size is = 60098 bytes

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