方法一

Properties properties = new Properties();
InputStream stream = PropertiesUtil.class.getClassLoader().getResourceAsStream("setting.properties");
properties.load(stream);  

方法二

public static URL getResource(String fileName, ClassLoader loader)
        throws IOException {
    URL resource = loader.getResource(fileName);
    if (resource == null) {
        throw new IOException("找不到resource: " + fileName);
    }
    return resource;
}  

public static Properties getProperties(URL source) throws IOException {
    InputStream input = source.openStream();
    try {
        Properties p = new Properties();
        p.load(input);
        return p;
    } finally {
        input.close();
   }
 }