代码备忘录

DateFormatUtils.format(System.currentTimeMillis(), "yyyy-MM-dd HH:mm:ss");

DateUtils.parseDate("20120617", new String[] {"yyyyMMdd", "yyyyMM"});

下载maven安装包资源：

wget http://repos.fedorapeople.org/repos/dchen/apache-maven/epel-apache-maven.repo -O /etc/yum.repos.d/epel-apache-maven.repo

yum -y install apache-maven

mvn -v

• 卸载Oracle JDK

rpm -qa|grep java 

rpm -qa|grep jdk

rpm -e --nodeps   ${系统jdk名}

安装

 wget https://d6.injdk.cn/oracle/8/jdk-8u251-linux-x64.rpm
 
 rpm -ivh jdk-8u251-linux-x64.rpm 

各版本JDK： https://www.injdk.cn/

---

• 安装Docker && Docker Compose

curl -sSL https://get.daocloud.io/docker | sh

curl -L https://get.daocloud.io/docker/compose/releases/download/1.29.2/docker-compose-`uname -s`-`uname -m` > /usr/local/bin/docker-compose
chmod +x /usr/local/bin/docker-compose

---

    public static void main(String[] args)
    {
        List<String> list = new ArrayList<String>();
        while (RandomUtils.nextInt() > 9999999)
        {
            list.add(RandomStringUtils.randomAscii(5));
        }
        System.out.println(list);
        System.out.println(list.size());
        while (list.size() > 10)
        {
            List<String> it = list.subList(0, 10);
            System.out.println(list.size() + ":\t" + it);
            list.removeAll(it);
        }
        System.out.println(list.size() + ":\t" + list);
    }

import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.concurrent.TimeUnit;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.scheduling.annotation.Scheduled;
import org.springframework.stereotype.Component;

import lombok.extern.slf4j.Slf4j;

/**
 * 
 * 日志定时任务
 * 
 * @author 00fly
 * @version [版本号, 2019年12月30日]
 * @see [相关类/方法]
 * @since [产品/模块版本]
 */
@Slf4j
@Component
public class LogJob
{
    @Autowired
    private SysLogService sysLogService;
    
    /**
     * 推送日志信息到3rd 9-22点每30分钟执行一次
     * 
     * @see [类、类#方法、类#成员]
     */
    @Scheduled(cron = "0 0/30 9-22 * * ? ")
    public void push()
    {
        try
        {
            log.info("★★★★★★★★★ now push Log ★★★★★★★ ");
            Map<String, Object> params = new HashMap<String, Object>();
            
            // 批量推送未同步日志信息
            int pageNo = 1, pageSize = 1000;
            params.put(Constant.LIMIT, pageSize);
            params.put("channel", "PUYUAN");// 3rd
            params.put("dataSyn", "0"); // 待同步
            PageUtils data;
            do
            {
                log.info("★★★★★★★★★ now push pageNo={}, pageSize={}", pageNo, pageSize);
                params.put(Constant.PAGE, pageNo++);
                data = sysLogService.queryPage(params);
                List<SysLogEntity> list = (List<SysLogEntity>)data.getList();
                
                // TODO: 我方作为客户端将数据推送到3rd，3rd处理成功后返回已处理id列表,更新数据同步成功状态
                for (SysLogEntity entity : list)
                {
                    log.info("****{}*****", entity);
                }
                TimeUnit.MINUTES.sleep(2);
            } while (data.getTotalCount() > 0);
        }
        catch (Exception e)
        {
            log.error("★★★★★★★★★ now push Log Error: {} ★★★★★★★ ", e.getCause());
        }
    }
}

    @Test
    public void test()
    {
        Scanner sc = new Scanner(System.in);
        do
        {
            logger.info("{}", mockMvc);
                        
            logger.info("------------输入x退出,回车换行继续------------");
        } while (!StringUtils.equalsIgnoreCase(sc.nextLine(), "x"));
        logger.info("------------成功退出------------");
        sc.close();
    }

String.format("%.nf",d);    //表示保留N位！