Properties是Java中jdk自帶的一個物件

import java.util.Properties;

public synchronized Object setProperty(String key, String value)
public String getProperty(String key)

.properties檔案：

將檔案中的資料變為properties物件：

 Properties properties = new Properties();
 try (FileInputStream fis = new FileInputStream(path)) {
        properties.load(fis);
 } catch (IOException e) {
        throw new RuntimeException("flyusercenter載入配置失敗", e);
 }