maven工程中读取resources中的资源文件

package com.thb;

import java.io.BufferedReader;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.URL;
import java.util.Properties;

import java.util.Map.Entry;

public class Demo {
    
    public static void main(String[] args) {

        String fileName = "/test.properties";
        URL url = Demo.class.getResource(fileName);  
        String path = url.getPath();

        try {
            BufferedReader in = new BufferedReader(new InputStreamReader(new FileInputStream(path)));
            Properties pro = new Properties();
            pro.load(in);
            for (Entry<Object, Object>entry : pro.entrySet()) {
                System.out.println(entry.getKey() + "=" + entry.getValue());
            }
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

}