jdbc中自定义封装JDBCUntils类

封装的工具类

import java.io.IOException;
import java.io.InputStream;
import java.sql.*;
import java.util.Properties;

//封装jdbc工具类
public class JDBCUntils {

    private static String url;
    private static String user;
    private static String password;
    private static String driver;

    //读取配置文件
    static {
        Properties properties = new Properties();
        ClassLoader classLoader = JDBCUntils.class.getClassLoader();
        InputStream stream = classLoader.getResourceAsStream("jdbc.properties");
        try {
            properties.load(stream);
            url = properties.getProperty("url");
            user = properties.getProperty("user");
            password = properties.getProperty("password");
            driver = properties.getProperty("driver");

            Class.forName(driver);
        } catch (IOException | ClassNotFoundException e) {
            e.printStackTrace();
        }

    }

    //获取Connection对象
    public static Connection getConnection() throws SQLException {
        return DriverManager.getConnection(url, user, password);
    }

    //释放资源
    public static void close(Connection connection, Statement statement){
        if (connection != null){
            try {
                connection.close();
            } catch (SQLException throwables) {
                throwables.printStackTrace();
            }
        }
        if (statement != null){
            try {
                statement.close();
            } catch (SQLException throwables) {
                throwables.printStackTrace();
            }
        }
    }


    //重载个释放资源的方法
    public static void close(Connection connection, Statement statement, ResultSet resultSet){
        if (connection != null){
            try {
                connection.close();
            } catch (SQLException throwables) {
                throwables.printStackTrace();
            }
        }
        if (statement != null){
            try {
                statement.close();
            } catch (SQLException throwables) {
                throwables.printStackTrace();
            }
        }
        if (resultSet != null){
            try {
                resultSet.close();
            } catch (SQLException throwables) {
                throwables.printStackTrace();
            }
        }
    }
}

jdbc.properties文件

url = 数据库地址
user = 用户名
password = 密码
driver = com.mysql.jdbc.Driver