Java获取.properties配置文件某一项value根据key值

public static String getProperty(String key){
InputStream in = PropertiesUtils.class.getResourceAsStream("/conf.properties");
Properties properties = new Properties();
String value;
try {
properties.load(in);
value = properties.getProperty(key);
in.close();
return value;
} catch (IOException e) {
e.printStackTrace();
}
return null;
}