java 读取 properties 资源文件

package config_demo;

import java.io.InputStream;
import java.util.Properties;

public class UrlDemo {
    public void getWebInfUrl() {
        //获取配置文件的输入流
        InputStream inputStream = getClass().getResourceAsStream("/jdbc.properties");
        //实例化配置文件读取类
        Properties properties = new Properties();
        try{
            //加载配置文件
            properties.load(inputStream);
            //获取配置项的值
            String url = properties.getProperty("url");
            System.out.println(url);
        }catch(Exception e){
            //输出异常信息
            System.out.println(e.getMessage());
        }
    }
}