java操作数据库定时备份与还原
时间：2021-07-01 10:21:17
帮助过：15人阅读
public static void backup(String dbdir, String dbname, String backdir) {
Calendar calendar = Calendar.getInstance();
SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy_MM_dd_HHmmss");
String currentTime = dateFormat.format(calendar.getTime());
try {
long startTime = System.currentTimeMillis();
Runtime rt = Runtime.getRuntime();
Process child = rt
.exec(dbdir + "/bin/mysqldump --default-character-set=utf8 -uroot -p123456 " + dbname);
InputStream in = child.getInputStream();
InputStreamReader xx = new InputStreamReader(in, "utf8");
FileOutputStream fout = new FileOutputStream(new File(backdir, dbname + "_" + currentTime + ".bak"));
OutputStreamWriter writer = new OutputStreamWriter(fout, "utf8");
dateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
writer.write("-- Dump by Microsoul at " + dateFormat.format(calendar.getTime()) + "\r\n");
String inStr;
BufferedReader br = new BufferedReader(xx);
while ((inStr = br.readLine()) != null) {
writer.write(inStr);
writer.write("\r\n");
}
writer.write("\r\n-- Use " + (System.currentTimeMillis() - startTime) + "ms\r\n");
writer.flush();
in.close();
xx.close();
br.close();
writer.close();
fout.close();
} catch (Exception e) {
PrintStream print = null;
try {
print = new PrintStream(new File(backdir, 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();
}
}
}
}
}
以上是备份的代码；
Java代码
- public class Test {
- public static void main(String[] args) {
- Calendar twentyOne = Calendar.getInstance();
- twentyOne.set(Calendar.HOUR_OF_DAY, 23);
- twentyOne.set(Calendar.MINUTE, 0);
- twentyOne.set(Calendar.SECOND, 0);
-
- new Timer().schedule(new TimerTask() {
- @Override
- public void run() {
- DatabaseBackup.backup("/usr/local/mysql", "test", "/home/xtiger/db/");
- }
- }, twentyOne.getTime(), 24 * 3600 * 1000);
- }
- }
java操作数据库定时备份与还原
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