读取property文件中的数据库配置
java：Properties props = new Properties();FileInputStream in = new FileInputStream("database.properties");props.load(in);in.close();String drivers = props.getProperty("jdbc.driver");String url = props.getProperty("jdbc.url");String username = props.getProperty("jdbc.username");String password = props.getProperty("jdbc.password");return DriverManager.getConnection(url, username, password); database.properties：
jdbc.drivers=org.postgresql.Driverjdbc.url=jdbc:postgresql:COREJAVAjdbc.username=dbuserjdbc.password=secret
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