mysql每天23:00自動備份

1. public class DatabaseBackup {
2. /**
3. *
4. * @param dbdir mysql數據庫安裝路徑
5. * @param dbname 數據庫的名稱
6. * @param backdir 備份的目錄
7. */
8. public static void backup(String dbdir, String dbname, String backdir) {
9. Calendar calendar = Calendar.getInstance();
10. SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy_MM_dd_HHmmss");
11. String currentTime = dateFormat.format(calendar.getTime());
12. try {
13. long startTime = System.currentTimeMillis();
14. Runtime rt = Runtime.getRuntime();
15. Process child = rt
16. .exec(dbdir + "/bin/mysqldump --default-character-set=utf8 -uroot -p123456 " + dbname);
17. InputStream in = child.getInputStream();
18. InputStreamReader xx = new InputStreamReader(in, "utf8");
20. FileOutputStream fout = new FileOutputStream(new File(backdir, dbname + "_" + currentTime + ".bak"));
21. OutputStreamWriter writer = new OutputStreamWriter(fout, "utf8");
23. dateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
25. writer.write("-- Dump by Microsoul at " + dateFormat.format(calendar.getTime()) + "\r\n");
27. String inStr;
28. BufferedReader br = new BufferedReader(xx);
29. // 這樣實時寫入文件很重要，網上有很多是將讀取的存入字符串中，最後再寫成文件，這樣會導致Java的堆棧內存溢出。
30. while ((inStr = br.readLine()) != null) {
31. writer.write(inStr);
32. writer.write("\r\n");
33. }
35. writer.write("\r\n-- Use " + (System.currentTimeMillis() - startTime) + "ms\r\n");
37. writer.flush();
38. in.close();
39. xx.close();
40. br.close();
41. writer.close();
42. fout.close();
43. } catch (Exception e) {
44. PrintStream print = null;
45. try {
46. print = new PrintStream(new File(backdir, currentTime + "_backup_err.log"));
47. dateFormat.applyPattern("yyyy-MM-dd HH:mm:ss");
48. currentTime = dateFormat.format(calendar.getTime());
49. print.println(currentTime + " backup failed.");
50. e.printStackTrace(print);
51. print.flush();
52. } catch (IOException e2) {
54. } finally {
55. if (print != null) {
56. print.close();
57. }
58. }
59. }
61. }
62. }

以上是備份的代碼；

1. public class Test {
2. public static void main(String[] args) {
3. Calendar twentyOne = Calendar.getInstance();
4. twentyOne.set(Calendar.HOUR_OF_DAY, 23);
5. twentyOne.set(Calendar.MINUTE, 0);
6. twentyOne.set(Calendar.SECOND, 0);
8. new Timer().schedule(new TimerTask() {
9. @Override
10. public void run() {
11. DatabaseBackup.backup("/usr/local/mysql", "test", "/home/xtiger/db/");
12. }
13. }, twentyOne.getTime(), 24 * 3600 * 1000);
14. }
15. }

java操作數據庫定時備份與還原