public interface TaskScheduler {

    ScheduledFuture schedule(Runnable task, Trigger trigger);

    ScheduledFuture schedule(Runnable task, Date startTime);

    ScheduledFuture scheduleAtFixedRate(Runnable task, Date startTime, long period);

    ScheduledFuture scheduleAtFixedRate(Runnable task, long period);

    ScheduledFuture scheduleWithFixedDelay(Runnable task, Date startTime, long delay);

    ScheduledFuture scheduleWithFixedDelay(Runnable task, long delay);

}

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class DemoTask implements Runnable {
    final Logger logger = LoggerFactory.getLogger(this.getClass());

    @Override
    public void run() {
        logger.info("call DemoTask.run");
    }
}

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.scheduling.TaskScheduler;
import org.springframework.scheduling.support.CronTrigger;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;

@Controller
@RequestMapping("/scheduler")
public class SchedulerController {
    @Autowired
    TaskScheduler scheduler;

    @RequestMapping(value = "/start", method = RequestMethod.POST)
    public void start() {
        scheduler.schedule(new DemoTask(), new CronTrigger("0/5 * * * * *"));
    }
}

@Scheduled(fixedDelay=5000)
public void doSomething() {
    // something that should execute periodically
}

@Scheduled(fixedRate=5000)
public void doSomething() {
    // something that should execute periodically
}

@Scheduled(initialDelay=1000, fixedRate=5000)
public void doSomething() {
    // something that should execute periodically
}

@Scheduled(cron="*/5 * * * * MON-FRI")
public void doSomething() {
    // something that should execute on weekdays only
}

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.scheduling.annotation.Scheduled;
import org.springframework.stereotype.Component;

import java.text.SimpleDateFormat;
import java.util.Date;

/**
 * @description 使用@Scheduler注解调度任务范例
 * @author Vicotr Zhang
 * @date 2016年8月31日
 */
@Component
public class ScheduledMgr {
    private final SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");

    final Logger logger = LoggerFactory.getLogger(this.getClass());

    /**
     * 构造函数中打印初始化时间
     */
    public ScheduledMgr() {
        logger.info("Current time: {}", dateFormat.format(new Date()));
    }

    /**
     * fixedDelay属性定义调度间隔时间。调度需要等待上一次调度执行完成。
     */
    @Scheduled(fixedDelay = 5000)
    public void testFixedDelay() throws Exception {
        Thread.sleep(6000);
        logger.info("Current time: {}", dateFormat.format(new Date()));
    }

    /**
     * fixedRate属性定义调度间隔时间。调度不等待上一次调度执行完成。
     */
    @Scheduled(fixedRate = 5000)
    public void testFixedRate() throws Exception {
        Thread.sleep(6000);
        logger.info("Current time: {}", dateFormat.format(new Date()));
    }

    /**
     * initialDelay属性定义初始化后的启动延迟时间
     */
    @Scheduled(initialDelay = 1000, fixedRate = 5000)
    public void testInitialDelay() throws Exception {
        Thread.sleep(6000);
        logger.info("Current time: {}", dateFormat.format(new Date()));
    }

    /**
     * cron属性支持使用cron表达式定义触发条件
     */
    @Scheduled(cron = "0/5 * * * * ?")
    public void testCron() throws Exception {
        Thread.sleep(6000);
        logger.info("Current time: {}", dateFormat.format(new Date()));
    }
}

// 初始化一个通用英语的locale.
Locale locale1 = new Locale("en");
// 初始化一个加拿大英语的locale.
Locale locale2 = new Locale("en", "CA");
// 初始化一个美式英语变种硅谷英语的locale
Locale locale3 = new Locale("en", "US", "SiliconValley");
// 根据Locale常量初始化一个简体中文
Locale locale4 = Locale.SIMPLIFIED_CHINESE;

import java.util.Locale;
import java.util.ResourceBundle;

public class ResourceBundleDemo {

    public static void main(String[] args) {
        // 根据语言+地区编码初始化
        ResourceBundle rbUS = ResourceBundle.getBundle("locales.content", new Locale("en", "US"));
        // 根据Locale常量初始化
        ResourceBundle rbZhCN = ResourceBundle.getBundle("locales.content", Locale.SIMPLIFIED_CHINESE);
        // 获取本地系统默认的Locale初始化
        ResourceBundle rbDefault = ResourceBundle.getBundle("locales.content");
        // ResourceBundle rbDefault =ResourceBundle.getBundle("locales.content", Locale.getDefault()); // 与上行代码等价

        System.out.println("en-US:" + rbUS.getString("helloWorld"));
        System.out.println("en-US:" + String.format(rbUS.getString("time"), "08:00"));
        System.out.println("zh-CN：" + rbZhCN.getString("helloWorld"));
        System.out.println("zh-CN：" + String.format(rbZhCN.getString("time"), "08:00"));
        System.out.println("default：" + rbDefault.getString("helloWorld"));
        System.out.println("default：" + String.format(rbDefault.getString("time"), "08:00"));
    }

}

// 输出：
// en-US:HelloWorld!
// en-US:The current time is 08:00.
// zh-CN：世界，你好！
// zh-CN：当前时间是08:00。
// default：世界，你好！
// default：当前时间是08:00。

import java.text.NumberFormat;
import java.util.Locale;

public class NumberFormatDemo {

    public static void main(String[] args) {
        double num = 123456.78;
        NumberFormat format = NumberFormat.getCurrencyInstance(Locale.SIMPLIFIED_CHINESE);
        System.out.format("%f 的国际化（%s）结果: %s\n", num, Locale.SIMPLIFIED_CHINESE, format.format(num));
    }

}

// 输出：
// 123456.780000 的国际化（zh_CN）结果: ￥123,456.78

import java.text.DateFormat;
import java.util.Date;
import java.util.Locale;

public class DateFormatDemo {

    public static void main(String[] args) {
        Date date = new Date();
        DateFormat df = DateFormat.getDateInstance(DateFormat.MEDIUM, Locale.ENGLISH);
        DateFormat df2 = DateFormat.getDateInstance(DateFormat.MEDIUM, Locale.SIMPLIFIED_CHINESE);
        System.out.format("%s 的国际化（%s）结果: %s\n", date, Locale.ENGLISH, df.format(date));
        System.out.format("%s 的国际化（%s）结果: %s\n", date, Locale.SIMPLIFIED_CHINESE, df2.format(date));
    }

}

// 输出
// Fri Dec 23 11:14:45 CST 2022 的国际化（en）结果: Dec 23, 2022
// Fri Dec 23 11:14:45 CST 2022 的国际化（zh_CN）结果: 2022-12-23

import java.text.MessageFormat;
import java.util.GregorianCalendar;
import java.util.Locale;

public class MessageFormatDemo {

    public static void main(String[] args) {
        String pattern1 = "{0}，你好！你于 {1} 消费 {2} 元。";
        String pattern2 = "At {1,time,short} On {1,date,long}，{0} paid {2,number, currency}.";
        Object[] params = { "Jack", new GregorianCalendar().getTime(), 8888 };
        String msg1 = MessageFormat.format(pattern1, params);
        MessageFormat mf = new MessageFormat(pattern2, Locale.US);
        String msg2 = mf.format(params);
        System.out.println(msg1);
        System.out.println(msg2);
    }

}

// 输出：
// Jack，你好！你于 22-12-23 上午11:05 消费 8,888 元。
// At 11:05 AM On December 23, 2022，Jack paid $8,888.00.

package com.alibaba.dubbo.demo;

public interface DemoService {
    String sayHello(String name);
}

package com.alibaba.dubbo.demo.provider;

import com.alibaba.dubbo.demo.DemoService;

public class DemoServiceImpl implements DemoService {
    public String sayHello(String name) {
        return "Hello " + name;
    }
}

import org.springframework.context.support.ClassPathXmlApplicationContext;

public class Provider {
    public static void main(String[] args) throws Exception {
        ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext(new String[] {"http://10.20.160.198/wiki/display/dubbo/provider.xml"});
        context.start();
        System.in.read(); // 按任意键退出
    }
}

import org.springframework.context.support.ClassPathXmlApplicationContext;
import com.alibaba.dubbo.demo.DemoService;

public class Consumer {
    public static void main(String[] args) throws Exception {
        ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext(new String[] {"http://10.20.160.198/wiki/display/dubbo/consumer.xml"});
        context.start();
        DemoService demoService = (DemoService)context.getBean("demoService"); // 获取远程服务代理
        String hello = demoService.sayHello("world"); // 执行远程方法
        System.out.println( hello ); // 显示调用结果
    }
}

import lombok.extern.slf4j.Slf4j;
import org.springframework.boot.CommandLineRunner;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.jdbc.core.JdbcTemplate;

import java.sql.Connection;
import javax.sql.DataSource;

@Slf4j
@SpringBootApplication
public class SpringBootDataJdbcApplication implements CommandLineRunner {

    private final JdbcTemplate jdbcTemplate;

    public SpringBootDataJdbcApplication(JdbcTemplate jdbcTemplate) {
        this.jdbcTemplate = jdbcTemplate;
    }

    public static void main(String[] args) {
        SpringApplication.run(SpringBootDataJdbcApplication.class, args);
    }

    @Override
    public void run(String... args) throws Exception {
        DataSource dataSource = jdbcTemplate.getDataSource();

        Connection connection;
        if (dataSource != null) {
            connection = dataSource.getConnection();
        } else {
            log.error("连接数据源失败！");
            return;
        }

        if (connection != null) {
            log.info("数据源 Url: {}", connection.getMetaData().getURL());
        } else {
            log.error("连接数据源失败！");
        }
    }

}

import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.boot.jdbc.DataSourceBuilder;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Primary;
import org.springframework.jdbc.core.JdbcTemplate;

@Configuration
public class DataSourceConfig {

    @Primary
    @Bean("mysqlDataSource")
    @ConfigurationProperties(prefix = "spring.datasource.mysql")
    public DataSource mysqlDataSource() {
        return DataSourceBuilder.create().build();
    }

    @Primary
    @Bean("mysqlJdbcTemplate")
    public JdbcTemplate mysqlJdbcTemplate(@Qualifier("mysqlDataSource") DataSource dataSource) {
        return new JdbcTemplate(dataSource);
    }

    @Bean("h2DataSource")
    @ConfigurationProperties(prefix = "spring.datasource.h2")
    public DataSource h2DataSource() {
        return DataSourceBuilder.create().build();
    }

    @Bean(name = "h2JdbcTemplate")
    public JdbcTemplate h2JdbcTemplate(@Qualifier("h2DataSource") DataSource dataSource) {
        return new JdbcTemplate(dataSource);
    }

}

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.boot.CommandLineRunner;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.jdbc.core.JdbcTemplate;

import java.sql.Connection;
import java.sql.SQLException;
import javax.sql.DataSource;

@SpringBootApplication
public class SpringBootDataJdbcMultiDataSourceApplication implements CommandLineRunner {

    private static final Logger log = LoggerFactory.getLogger(SpringBootDataJdbcMultiDataSourceApplication.class);

    private final UserDao mysqlUserDao;

    private final UserDao h2UserDao;

    public SpringBootDataJdbcMultiDataSourceApplication(@Qualifier("mysqlUserDao") UserDao mysqlUserDao,
        @Qualifier("h2UserDao") UserDao h2UserDao) {
        this.mysqlUserDao = mysqlUserDao;
        this.h2UserDao = h2UserDao;
    }

    public static void main(String[] args) {
        SpringApplication.run(SpringBootDataJdbcMultiDataSourceApplication.class, args);
    }

    @Override
    public void run(String... args) throws Exception {

        if (mysqlUserDao != null && mysqlUserDao.getJdbcTemplate() != null) {
            printDataSourceInfo(mysqlUserDao.getJdbcTemplate());
            log.info("Connect to mysql datasource success.");
        } else {
            log.error("Connect to mysql datasource failed!");
            return;
        }

        if (h2UserDao != null) {
            printDataSourceInfo(h2UserDao.getJdbcTemplate());
            log.info("Connect to h2 datasource success.");
        } else {
            log.error("Connect to h2 datasource failed!");
            return;
        }

        // 主数据源执行 JDBC SQL
        mysqlUserDao.recreateTable();

        // 次数据源执行 JDBC SQL
        h2UserDao.recreateTable();
    }

    private void printDataSourceInfo(JdbcTemplate jdbcTemplate) throws SQLException {

        DataSource dataSource = jdbcTemplate.getDataSource();

        Connection connection;
        if (dataSource != null) {
            connection = dataSource.getConnection();
        } else {
            log.error("Get dataSource failed!");
            return;
        }

        if (connection != null) {
            log.info("DataSource Url: {}", connection.getMetaData().getURL());
        } else {
            log.error("Connect to datasource failed!");
        }
    }

}

@AutoConfiguration(before = SqlInitializationAutoConfiguration.class)
@ConditionalOnClass({ DataSource.class, EmbeddedDatabaseType.class })
@ConditionalOnMissingBean(type = "io.r2dbc.spi.ConnectionFactory")
@EnableConfigurationProperties(DataSourceProperties.class)
@Import(DataSourcePoolMetadataProvidersConfiguration.class)
public class DataSourceAutoConfiguration {

	@Configuration(proxyBeanMethods = false)
	@Conditional(EmbeddedDatabaseCondition.class)
	@ConditionalOnMissingBean({ DataSource.class, XADataSource.class })
	@Import(EmbeddedDataSourceConfiguration.class)
	protected static class EmbeddedDatabaseConfiguration {
	}

	@Configuration(proxyBeanMethods = false)
	@Conditional(PooledDataSourceCondition.class)
	@ConditionalOnMissingBean({ DataSource.class, XADataSource.class })
	@Import({ DataSourceConfiguration.Hikari.class, DataSourceConfiguration.Tomcat.class,
			DataSourceConfiguration.Dbcp2.class, DataSourceConfiguration.OracleUcp.class,
			DataSourceConfiguration.Generic.class, DataSourceJmxConfiguration.class })
	protected static class PooledDataSourceConfiguration {
  }

	static class PooledDataSourceCondition extends AnyNestedCondition {
    // 略
	}

	static class PooledDataSourceAvailableCondition extends SpringBootCondition {
    // 略
	}

	static class EmbeddedDatabaseCondition extends SpringBootCondition {
    // 略
	}
}

checkMatches("abc", "abc");

// 测试正则表达式字符：|
Assert.assertTrue(checkMatches("yes|no", "yes"));
Assert.assertTrue(checkMatches("yes|no", "no"));
Assert.assertFalse(checkMatches("yes|no", "right"));

Assert.assertTrue(checkMatches("(play|end)(ing|ed)", "ended"));
Assert.assertTrue(checkMatches("(play|end)(ing|ed)", "ending"));
Assert.assertTrue(checkMatches("(play|end)(ing|ed)", "playing"));
Assert.assertTrue(checkMatches("(play|end)(ing|ed)", "played"));

// 测试正则表达式字符：[]
Assert.assertTrue(checkMatches("[abc]", "b"));  // 字符只能是a、b、c
Assert.assertTrue(checkMatches("[a-z]", "m")); // 字符只能是a - z
Assert.assertTrue(checkMatches("[A-Z]", "O")); // 字符只能是A - Z
Assert.assertTrue(checkMatches("[a-zA-Z]", "K")); // 字符只能是a - z和A - Z
Assert.assertTrue(checkMatches("[a-zA-Z]", "k"));
Assert.assertTrue(checkMatches("[0-9]", "5")); // 字符只能是0 - 9

// 测试正则表达式字符：[^]
Assert.assertFalse(checkMatches("[^abc]", "b")); // 字符不能是a、b、c
Assert.assertFalse(checkMatches("[^a-z]", "m")); // 字符不能是a - z
Assert.assertFalse(checkMatches("[^A-Z]", "O")); // 字符不能是A - Z
Assert.assertFalse(checkMatches("[^a-zA-Z]", "K")); // 字符不能是a - z和A - Z
Assert.assertFalse(checkMatches("[^a-zA-Z]", "k"));
Assert.assertFalse(checkMatches("[^0-9]", "5")); // 字符不能是0 - 9

// {n}: n 是一个非负整数。匹配确定的 n 次。
checkMatches("ap{1}", "a");
checkMatches("ap{1}", "ap");
checkMatches("ap{1}", "app");
checkMatches("ap{1}", "apppppppppp");

// {n,}: n 是一个非负整数。至少匹配 n 次。
checkMatches("ap{1,}", "a");
checkMatches("ap{1,}", "ap");
checkMatches("ap{1,}", "app");
checkMatches("ap{1,}", "apppppppppp");

// {n,m}: m 和 n 均为非负整数，其中 n <= m。最少匹配 n 次且最多匹配 m 次。
checkMatches("ap{2,5}", "a");
checkMatches("ap{2,5}", "ap");
checkMatches("ap{2,5}", "app");
checkMatches("ap{2,5}", "apppppppppp");

Assert.assertTrue(checkMatches("^app[a-z]{0,}", "apple")); // 字符串必须以app开头
Assert.assertFalse(checkMatches("^app[a-z]{0,}", "aplause"));

Assert.assertTrue(checkMatches("[a-z]{0,}ing$", "playing")); // 字符串必须以ing结尾
Assert.assertFalse(checkMatches("[a-z]{0,}ing$", "long"));

// 匹配除“\n”之外的任何单个字符
Assert.assertTrue(checkMatches(".{1,}", "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789_"));
Assert.assertTrue(checkMatches(".{1,}", "~!@#$%^&*()+`-=[]{};:<>,./?|\\"));
Assert.assertFalse(checkMatches(".", "\n"));
Assert.assertFalse(checkMatches("[^\n]", "\n"));

// 匹配一个数字字符。等价于[0-9]
Assert.assertTrue(checkMatches("\\d{1,}", "0123456789"));
// 匹配一个非数字字符。等价于[^0-9]
Assert.assertFalse(checkMatches("\\D{1,}", "0123456789"));

// 匹配包括下划线的任何单词字符。类似但不等价于“[A-Za-z0-9_]”，这里的单词字符指的是Unicode字符集
Assert.assertTrue(checkMatches("\\w{1,}", "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789_"));
Assert.assertFalse(checkMatches("\\w{1,}", "~!@#$%^&*()+`-=[]{};:<>,./?|\\"));
// 匹配任何非单词字符
Assert.assertFalse(checkMatches("\\W{1,}", "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789_"));
Assert.assertTrue(checkMatches("\\W{1,}", "~!@#$%^&*()+`-=[]{};:<>,./?|\\"));

// 匹配任何不可见字符，包括空格、制表符、换页符等等。等价于[ \f\n\r\t\v]
Assert.assertTrue(checkMatches("\\s{1,}", " \f\r\n\t"));
// 匹配任何可见字符。等价于[^ \f\n\r\t\v]
Assert.assertFalse(checkMatches("\\S{1,}", " \f\r\n\t"));

// *: 匹配前面的子表达式零次或多次。* 等价于{0,}。
checkMatches("ap*", "a");
checkMatches("ap*", "ap");
checkMatches("ap*", "app");
checkMatches("ap*", "apppppppppp");

// +: 匹配前面的子表达式一次或多次。+ 等价于 {1,}。
checkMatches("ap+", "a");
checkMatches("ap+", "ap");
checkMatches("ap+", "app");
checkMatches("ap+", "apppppppppp");

// ?: 匹配前面的子表达式零次或一次。? 等价于 {0,1}。
checkMatches("ap?", "a");
checkMatches("ap?", "ap");
checkMatches("ap?", "app");
checkMatches("ap?", "apppppppppp");

// (\w+)\s\1\W(\w+) 匹配重复的单词和紧随每个重复的单词的单词
Assert.assertTrue(findAll("(\\w+)\\s\\1\\W(\\w+)",
		"He said that that was the the correct answer.") > 0);

// (?<duplicateWord>\w+)\s\k<duplicateWord>\W(?<nextWord>\w+) 匹配重复的单词和紧随每个重复的单词的单词
Assert.assertTrue(findAll("(?<duplicateWord>\\w+)\\s\\k<duplicateWord>\\W(?<nextWord>\\w+)",
		"He said that that was the the correct answer.") > 0);

// 匹配由句号终止的语句。
Assert.assertTrue(findAll("(?:\\b(?:\\w+)\\W*)+\\.", "This is a short sentence. Never end") > 0);

// \b\w+(?=\sis\b) 表示要捕获is之前的单词
Assert.assertTrue(findAll("\\b\\w+(?=\\sis\\b)", "The dog is a Malamute.") > 0);
Assert.assertFalse(findAll("\\b\\w+(?=\\sis\\b)", "The island has beautiful birds.") > 0);
Assert.assertFalse(findAll("\\b\\w+(?=\\sis\\b)", "The pitch missed home plate.") > 0);
Assert.assertTrue(findAll("\\b\\w+(?=\\sis\\b)", "Sunday is a weekend day.") > 0);

// (?<=\b20)\d{2}\b 表示要捕获以20开头的数字的后面部分
Assert.assertTrue(findAll("(?<=\\b20)\\d{2}\\b", "2010 1999 1861 2140 2009") > 0);

// \b(?!un)\w+\b 表示要捕获未以“un”开头的单词
Assert.assertTrue(findAll("\\b(?!un)\\w+\\b", "unite one unethical ethics use untie ultimate") > 0);

// (?<!(Saturday|Sunday) )\b\w+ \d{1,2}, \d{4}\b 表示要捕获任意工作日（即周一到周五）
Assert.assertTrue(findAll("(?<!(Saturday|Sunday) )\\b\\w+ \\d{1,2}, \\d{4}\\b", "Monday February 1, 2010") > 0);
Assert.assertTrue(findAll("(?<!(Saturday|Sunday) )\\b\\w+ \\d{1,2}, \\d{4}\\b", "Wednesday February 3, 2010") > 0);
Assert.assertFalse(findAll("(?<!(Saturday|Sunday) )\\b\\w+ \\d{1,2}, \\d{4}\\b", "Saturday February 6, 2010") > 0);
Assert.assertFalse(findAll("(?<!(Saturday|Sunday) )\\b\\w+ \\d{1,2}, \\d{4}\\b", "Sunday February 7, 2010") > 0);
Assert.assertTrue(findAll("(?<!(Saturday|Sunday) )\\b\\w+ \\d{1,2}, \\d{4}\\b", "Monday, February 8, 2010") > 0);