java 定时备份数据库

原文：http://www.open-open.com/code/view/1447490829678

/**

     操作数据库

*/

public class BackupDb {
     public String backup() throws IOException{
      String user = "root"; //数据库的用户名
      String password = "admin";//数据库的密码 
      String database = "hrtweb";//要备份的数据库名 
      Date date = new Date();
      SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMddHHmmss");
      String filepath = "d:\"+sdf.format(date)+".sql";
      File file = new File("d:\",sdf.format(date)+".sql");
      if(!file.exists()){
       file.createNewFile();  
      }
      String stmt1 = "mysqldump " + database +" -h 127.0.0.1 "+ " -u " + user + " -p" +
      password + " --default-character-set=gbk --result-file=" + filepath;
      try {
        Runtime.getRuntime().exec(stmt1);
        System.out.println("已经保存到 " + filepath + " 中");
      } catch (IOException e) {
       e.printStackTrace();
      }
      return filepath;
     }
    }

/**

    创建定时器

*/

public class PickTask {
    private Timer timer = new Timer();
     private  TimerTask task = new TimerTask() {
      public void run() {
       Date date = new Date();
       SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
       String beginDate = sdf.format(date);
       String beginTime = beginDate.substring(11, 16);
       System.out.println("开始时间："+beginDate);

       BackupDb bdb = new BackupDb();
          // 设定备份时间
       if (beginTime.equals("17:09")) {
        try {
         bdb.backup(); // 执行文件备份
         String dbName = bdb.backup().toString(); // 取出备份的文件名字
         String path = "d:\";
         int nameNo = dbName.lastIndexOf("\");
         //判断文件是否存在，如果存在，则备份成功，如果不存在则备份不成功需要重新备份
         File file = new File(path, dbName.substring(nameNo + 1,dbName.length()));
         if (file.exists()){
               System.out.println("备份成功");

         }else{

                System.out.println("备份失败，重新备份");
               //在备份未成功的情况下重新备份
          new PickTask().start(1, 1);
         }

        } catch (FileNotFoundException e) {
         System.out.println("can not find the file");
        } catch (IOException e) {
         e.printStackTrace();
        }
       }else{
        System.out.println("时间还不到呢，不要着急哦！");
       }
      }
     };

          //start 方法不能少，主要是schedule方法
     public void start(int delay, int internal) {
      timer.schedule(task, delay * 1000, internal * 1000);
     }
}



/**

    测试类，执行定时备份指令

*/

public class TimerUse {
    public static void main(String[] args) {
          PickTask picktask = new PickTask();
          picktask.start(1, 60); // 每60秒执行一次
         }
}