Hutool-读取配置文件中的配置

1、读取配置文件：example.setting

[demo]
ds.setting.path = config/other.setting
driver = com.mysql.jdbc.Driver
url = jdbc:mysql://fedora.vmware:3306/extractor
user = root${demo.driver}
pass = 123456
port = 3306

2、测试代码：

import cn.hutool.setting.Setting;
import cn.hutool.setting.dialect.Props;

public class SettingTest {
    public static void main(String[] args) {
        //方式一、使用Setting类
        //读取配置文件所有的内容
        Setting setting = new Setting("example.setting");
        System.out.println(setting); 
        //{demo={ds.setting.path=config/other.setting, driver=com.mysql.jdbc.Driver, url=jdbc:mysql://fedora.vmware:3306/extractor, user=root${demo.driver}, pass=123456, port=3306}}
        //读取配置文件中键为driver的值
        String driver1 = setting.getStr("driver","默认值");
        System.out.println(driver1);  //默认值
        //读取分组为demo里面的键为driver的值
        Object driver = setting.getByGroup("driver","demo");
        System.out.println(driver);   //com.mysql.jdbc.Driver
        //读取分组为demo里面的键为driver的值
        String str = setting.getStr("driver", "demo", "默认值");
        System.out.println(str);   //com.mysql.jdbc.Driver

        String driver2 = setting.getWithLog("driver");
        System.out.println(driver2);   //null
        String byGroupWithLog = setting.getByGroupWithLog("driver", "demo");
        System.out.println(byGroupWithLog);   //com.mysql.jdbc.Driver
        Setting demo = setting.getSetting("demo");
        System.out.println(demo);   
        //{={ds.setting.path=config/other.setting, driver=com.mysql.jdbc.Driver, url=jdbc:mysql://fedora.vmware:3306/extractor, user=root${demo.driver}, pass=123456, port=3306}}

        //在配置文件变更时自动加载
        setting.autoLoad(true);
        
        //方式二、使用Props类
        //使用Props类，props继承了properties
        Props props = new Props("example.setting");
        String driver3 = props.getProperty("driver");
        System.out.println(driver3);   //com.mysql.jdbc.Driver
        String driver4 = props.getStr("driver");
        System.out.println(driver4);   //com.mysql.jdbc.Driver
    }
}