版权声明: https://blog.csdn.net/qq_36004521/article/details/81481608
我是在SpringBoot项目中写的
1.创建时间管理类
package com.hontye.Database;
import com.hontye.parameter.util.PropertyFileUtils;
import java.util.Calendar;
import java.util.Date;
import java.util.Timer;
/*在 TimerManager 这个类里面,大家一定要注意 时间点的问题。如果你设定在凌晨2点执行任务。但你是在2点以后
发布的程序或是重启过服务,那这样的情况下,任务会立即执行,而不是等到第二天的凌晨2点执行。为了,避免这种情况
发生,只能判断一下,如果发布或重启服务的时间晚于定时执行任务的时间,就在此基础上加一天。*/
public class TimerManager {
//时间间隔 一天时间
private static final long PERIOD_DAY = 24 * 60 * 60 * 1000;
public TimerManager() {
//获取并处理配置文件中的时间
String backuptime=PropertyFileUtils.get("backuptime");
String[] time=backuptime.split(":");
int hours=Integer.parseInt(time[0]);
int minute=Integer.parseInt(time[1]);
int second=Integer.parseInt(time[2]);
Calendar calendar = Calendar.getInstance();
/*** 定制每日2:00执行方法 ***/
calendar.set(Calendar.HOUR_OF_DAY,hours);
calendar.set(Calendar.MINUTE, minute);
calendar.set(Calendar.SECOND, second);
Date date=calendar.getTime(); //第一次执行定时任务的时间
//如果第一次执行定时任务的时间 小于 当前的时间
//此时要在 第一次执行定时任务的时间 加一天,以便此任务在下个时间点执行。如果不加一天,任务会立即执行。
if (date.before(new Date())) {
date = this.addDay(date, 1);
}
Timer timer = new Timer();
NFDFlightDataTimerTask task = new NFDFlightDataTimerTask();
//安排指定的任务在指定的时间开始进行重复的固定延迟执行。
timer.schedule(task,date,PERIOD_DAY);
}
// 增加或减少天数
public Date addDay(Date date, int num) {
Calendar startDT = Calendar.getInstance();
startDT.setTime(date);
startDT.add(Calendar.DAY_OF_MONTH, num);
return startDT.getTime();
}
}
2.配置监听器
package com.hontye.Database;
import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;
//创建一个监听器
public class NFDFlightDataTaskListener implements ServletContextListener {
public void contextInitialized(ServletContextEvent event) {
new TimerManager();
}
public void contextDestroyed(ServletContextEvent event) {
}
}
3.配置监听器
package com.hontye.parameter;
import com.hontye.Database.NFDFlightDataTaskListener;
import com.hontye.parameter.util.PropertyFileUtils;
import org.springframework.boot.web.servlet.ServletListenerRegistrationBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
/*
* 监听器配置
* */
@Configuration
public class ListenerConfig {
@Bean
public ServletListenerRegistrationBean servletListenerRegistrationBean(){
ServletListenerRegistrationBean servletListenerRegistrationBean = new ServletListenerRegistrationBean();
servletListenerRegistrationBean.setListener(new PropertyFileUtils());
return servletListenerRegistrationBean;
}
@Bean
public ServletListenerRegistrationBean servletListenerRegistrationBean1(){
ServletListenerRegistrationBean servletListenerRegistrationBean = new ServletListenerRegistrationBean();
servletListenerRegistrationBean.setListener(new NFDFlightDataTaskListener());
return servletListenerRegistrationBean;
}
}
4.创建执行类,继承TimerTask
package com.hontye.Database;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.util.TimerTask;
//调用要执行的内容
public class NFDFlightDataTimerTask extends TimerTask {
private static Logger log = LoggerFactory.getLogger(NFDFlightDataTimerTask.class);
@Override
public void run() {
try {
new DatabaseBackupUtil();//要执行的内容
} catch (Exception e) {
log.info("-------------解析信息发生异常--------------");
}
}
}
5.编写数据库备份工具类
package com.hontye.Database;
import com.hontye.parameter.util.PropertyFileUtils;
import java.io.*;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Date;
public class DatabaseBackupUtil {
/**
* Java代码实现MySQL数据库导出
*
* @author GaoHuanjie
* @param hostIP MySQL数据库所在服务器地址IP
* @param userName 进入数据库所需要的用户名
* @param password 进入数据库所需要的密码
* @param savePath 数据库导出文件保存路径
* @param databaseName 要导出的数据库名
* @return 返回true表示导出成功,否则返回false。
*/
private static String hostIP = PropertyFileUtils.get("hostIp");
private static String userName = PropertyFileUtils.get("spring.datasource.username");
private static String password = PropertyFileUtils.get("spring.datasource.password");
private static String savePath = PropertyFileUtils.get("savePath");
private static String databaseName = PropertyFileUtils.get("databaseName");
private static String binUrl = PropertyFileUtils.get("binUrl");
public DatabaseBackupUtil() throws InterruptedException {
// 备份数据库
if(exportDatabaseTool()){
System.out.println("备份数据库成功!");
}
}
public static boolean exportDatabaseTool() throws InterruptedException {
File saveFile = new File(savePath);
if (!saveFile.exists()) {// 如果目录不存在
saveFile.mkdirs();// 创建文件夹
}
if(!savePath.endsWith(File.separator)){
savePath = savePath + File.separator;
}
PrintWriter printWriter = null;
BufferedReader bufferedReader = null;
try {
DateFormat df = new SimpleDateFormat("yyyy-MM-dd-HH-mm-ss");
String fileName = df.format(new Date()) + ".sql";
printWriter = new PrintWriter(new OutputStreamWriter(new FileOutputStream(savePath+"test.sql"), "utf8"));
StringBuilder stringBuilder = new StringBuilder();
if(binUrl != null && !binUrl.equals("")){
stringBuilder.append(binUrl).append("/");
}
stringBuilder.append("mysqldump").append(" --opt").append(" -h").append(hostIP);
stringBuilder.append(" --user=").append(userName) .append(" --password=").append(password).append(" --lock-all-tables=true");
stringBuilder.append(" --result-file=").append(savePath+fileName).append(" --default-character-set=utf8 ").append(databaseName).append(" -R");
String command = stringBuilder.toString();
Process process = Runtime.getRuntime().exec(command);
InputStreamReader inputStreamReader = new InputStreamReader(process.getInputStream(), "utf8");
bufferedReader = new BufferedReader(inputStreamReader);
String line;
while((line = bufferedReader.readLine())!= null){
printWriter.println(line);
}
printWriter.flush();
if(process.waitFor() == 0){//0 表示线程正常终止。
return true;
}
}catch (IOException e) {
e.printStackTrace();
} finally {
try {
if (bufferedReader != null) {
bufferedReader.close();
}
if (printWriter != null) {
printWriter.close();
}
} catch (IOException e) {
e.printStackTrace();
}
}
return false;
}
}