import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.util.Properties;
 
public class ConfigHandler {
 
    private static final String DB_PROPERTIES_FILE = "D:\\ltkjprojectconf\\config.properties";
    private static final String DB_URL_KEY = "ip";
    private static final String DB_PROT_KEY = "prot";
    private static final String DB_NAME_KEY = "name";
    private static final String DB_USER_KEY = "username";
    private static final String DB_PASSWORD_KEY = "password";
    private Connection connection;
    private Connection connectToDatabase(Properties props) throws SQLException {
        String dbUrl = "jdbc:mysql://"+props.getProperty("ip")+":"+props.getProperty("prot")+"/"+props.getProperty("name")+"" +
                "?useUnicode=true&characterEncoding=utf8&zeroDateTimeBehavior=convertToNull&useSSL=false&serverTimezone=GMT%2B8";
        String dbUser = props.getProperty(DB_USER_KEY);
        String dbPassword = props.getProperty(DB_PASSWORD_KEY);
        // 加载MySQL驱动
        try {
            Class.forName("com.mysql.cj.jdbc.Driver");
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        }
        if (connection == null || connection.isClosed()) {
            // 关闭旧的连接
            if (connection != null) {
                try {
                    connection.close();
                } catch (SQLException e) {
                    e.printStackTrace();
                }
            }
            // 创建新的数据库连接
//            connection = DriverManager.getConnection(connectionString, username, password);
        }
        return DriverManager.getConnection(dbUrl, dbUser, dbPassword);
    }
 
    public void modifyConfigAndRefreshDB(String newDbUrl,String prot,String name, String newDbUser, String newDbPassword) throws IOException, SQLException {
        Properties properties = new Properties();
        properties.load(new FileInputStream(DB_PROPERTIES_FILE));
 
        // 修改配置
        properties.setProperty(DB_URL_KEY, newDbUrl);
        properties.setProperty(DB_PROT_KEY, prot);
        properties.setProperty(DB_NAME_KEY, name);
        properties.setProperty(DB_USER_KEY, newDbUser);
        properties.setProperty(DB_PASSWORD_KEY, newDbPassword);
 
        // 更新配置文件
        properties.store(new FileOutputStream(DB_PROPERTIES_FILE), null);
 
        // 关闭旧的数据库连接，并建立新的连接
        Connection connection = connectToDatabase(properties);
        // ... 使用新的connection进行数据库操作 ...
 
        // 确保关闭数据库连接
        if (connection != null && !connection.isClosed()) {
            connection.close();
        }
    }
 
    public static void main(String[] args) {
        ConfigHandler configHandler = new ConfigHandler();
        try {
            // 假设新的数据库连接信息
            String newDbUrl = "192.168.0.5";
            String prot = "3306";
            String name = "ltkjpeis1";
            String newDbUser = "root";
            String newDbPassword = "root";
 
            configHandler.modifyConfigAndRefreshDB(newDbUrl,prot,name,newDbUser, newDbPassword);
            System.out.println("数据库配置已更新并且数据库连接已刷新。");
        } catch (IOException | SQLException e) {
            e.printStackTrace();
        }
    }
}