- **載入方法**
```java
public class BackgroundConfigUtil {

public static final Logger LOGGER = LoggerFactory.getLogger(BackgroundConfigUtil.class);

private static final String PATH = "prod.properties";
    private static Properties prop;

static {
        loadProp();
    }

private static synchronized void loadProp() {
        prop = new Properties();
        InputStream in = null;
        try {
            in = BackgroundConfigUtil.class.getClassLoader().getResourceAsStream(PATH);
            prop.load(in);
        } catch (Exception e) {
            LOGGER.error("配置檔案載入失敗，error：", e);
        } finally {
            if (in != null) {
                try {
                    in.close();
                } catch (IOException e) {
                    LOGGER.error("載入配置檔案流關閉失敗，error：", e);
                }
            }
        }
    }

public static String getProperties(String key){
        return prop.getProperty(key);
    }

public static void main(String[] args) {
        System.out.println(getProperties("localhost"));
    }
}
```

JAVA載入配置檔案方法

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