java读取properties

package hello;

import java.io.IOException;
import java.util.Properties;

public class Main {

  public static void main(String[] args) throws IOException {

    // setting.properties
    Properties props = new Properties();
    props.load(Main.class.getResourceAsStream("/hello/setting.properties"));
    String url = props.getProperty("url");
    String env = props.getProperty("env", "local"); // default value
    
    System.out.println(url);
    System.out.println(env);
  }
}