本文实例为大家分享了Java如何定时备份文件的具体实现代码，供大家参考，具体内容如下
程序思路：
1.空目录不备份，但非空目录都备份
2.源目录 source 要递归他下面所有的文件和目录 存入List
3.循环这个list，创建每个文件的目录
4.开始复制
以下代码实现了定时备份路径为e:\\a的文件，每30秒进行一次备份，时间可修改。
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public class Test12 { public static void main(String[] args) throws InterruptedException { Timer t = new Timer(); t.scheduleAtFixedRate(new MyTask(),new Date(),1000*30); for(int i = 0;i<10000;i++){ Thread.sleep(1000); System.out.println("warning"); } }}class MyTask extends TimerTask{ static final String SOURCE = "e:\\a"; static String DEST; @Override public void run() { Date d = new Date(); DateFormat df = new SimpleDateFormat("yyyy-MM-dd_HH-mm-ss"); DEST = "e:\\dest_" + df.format(d); File file = new File(SOURCE); File dest = new File(DEST); if(dest.exists()){ deleteAll(dest); } System.out.println("创建备份目录？"+dest.mkdirs()); List<File> list = new ArrayList<File>(); getAllFile(file,list); backUp(list,dest); } //备份 private static void backUp(List<File> list, File dest) { if (list == null || list.size() <= 0) { return; } for (File f : list) { String fpath = f.getAbsolutePath(); //取出绝对路径 e:\\a String newpath = fpath.replace(SOURCE, DEST); System.out.println("对应的新路径" + newpath); File newFile = new File(newpath); if (newFile.getParentFile().exists() == false) { System.out.println("创建" + newFile + "的父目录成功？" + newFile.getParentFile().mkdirs()); } if (f.isFile()) { copy(f, newFile); } } } //复制 private static void copy(File inFile, File outFile) { FileInputStream fis = null; FileOutputStream fos = null; boolean isFlag = false; try { fis = new FileInputStream(inFile); fos = new FileOutputStream(outFile); byte[] bs = new byte[1024]; int length = -1; while ((length = fis.read(bs)) != -1) { fos.write(bs, 0, length); } fos.flush(); } catch (Exception e) { e.printStackTrace(); } finally { if (fos != null) { try { fos.close(); } catch (IOException e) { e.printStackTrace(); } } if (fis != null) { try { fis.close(); } catch (IOException e) { e.printStackTrace(); } } } } //递归获取原目录下所有的文件信息 private static void getAllFile(File source, List<File> list) { if (source.isDirectory()) { //查看子目录 listFile() File[] fs = source.listFiles(); if (fs != null && fs.length > 0) { //说明有子目录或子文件 for (File ff : fs) { getAllFile(ff, list); } } } list.add(source); } //递归删除 private static void deleteAll(File f) { if (f.isDirectory()) { File[] fs = f.listFiles(); if (fs != null && fs.length > 0) { for (File file : fs) { deleteAll(file); } } } System.out.println(f + "删除成功？" + f.delete()); }} |
再为大家补充一段：
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import java.util.Calendar;import java.util.Date;import java.text.SimpleDateFormat;import java.io.IOException;import java.io.PrintStream; public class Backup { public static void main(String[] args) { Runtime runtime = Runtime.getRuntime(); Calendar calendar = Calendar.getInstance(); SimpleDateFormat dateFormat = new SimpleDateFormat("yyyyMMdd_HHmmss"); String currentTime = dateFormat.format(calendar.getTime()); Process p = null; PrintStream print = null; StringBuilder buf = new StringBuilder(); for(String a : args){ buf.append(a); buf.append(" "); } String databases = buf.toString(); try{ p = runtime.exec("cmd /c mysqldump -uroot -p1234 -B "+databases+">"+currentTime+".sql.bak"); }catch (IOException e){ if( p != null ){ p.destroy(); } try{ print = new PrintStream(currentTime+"_backup_err.log"); dateFormat.applyPattern("yyyy-MM-dd HH:mm:ss"); currentTime = dateFormat.format(calendar.getTime()); print.println(currentTime+" backup failed."); e.printStackTrace(print); print.flush(); }catch (IOException e2){ }finally{ if(print!=null){ print.close(); } } } }} |
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持服务器之家。
原文链接：https://blog.csdn.net/qq_45213010/article/details/111992387
