在Java编程中，如何检查文件是否在服务器上被修改了？

以下示例显示如何检查文件是否在服务器上进行了修改。

package com.yiibai;

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

public class FileModificationTime2 {
    public static void main(String[] argv) throws Exception {
        URL u = new URL("http://www.yiibai.com/static.v4/img/logo.png");
        URLConnection uc = u.openConnection();
        uc.setUseCaches(false);
        long timestamp = uc.getLastModified();
        System.out.println("The last modification time of logo.png is :" + timestamp);
    }
}

上述代码示例将产生以下结果 -

The last modification time of logo.png is :1481341017000

示例-2

以下是检查文件在服务器上修改的示例。

package com.yiibai;


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

public class FileModificationTime {
   public static void main(String[] argv)throws Exception {
      URL u = new URL("http://www.yiibai.com/favicon.ico");

      URLConnection uc = u.openConnection();
      uc.setUseCaches(false);
      long timestamp = uc.getLastModified();
      System.out.println("The last modification time of file is :"+timestamp);
   }
}

上述代码示例将产生以下结果 -

The last modification time of file is :1367414578000

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