code: public static Properties readPropertiesFromClasspathFile(String fullPath) {
          Properties properties = new Properties();
          try (InputStream inputStream = readClasspathFileIntoStream(fullPath)) {
              properties.load(new InputStreamReader(inputStream));
          } catch (IOException e) {
              throw new RuntimeException("加载配置文件" + fullPath + "出错");
          }
          return properties;
      }
docs: 从classpath内加载指定的文件到{@link Properties}内