jdbc连接数据库

　　Java中连接MySQL数据库：

　　第一步：创建jdbc.properties文件

　　

jdbc.driverClassName=com.mysql.jdbc.Driver    
jdbc.url=jdbc:mysql://localhost:3306/springmybatis
jdbc.username=root
jdbc.password=5615

　　第二步：创建DBUtil.java工具类

　　

public class DBUtil {

    private static String  driver = null;
    private static String url = null;
    private static String username = null;
    private static String password = null;
    
    static{
        Properties pp = new Properties();
        try {
            pp.load(DBUtil.class.getClassLoader().getResourceAsStream("jdbc.properties"));
            driver = pp.getProperty("jdbc.driverClassName");
            url = pp.getProperty("jdbc.url");
            username = pp.getProperty("jdbc.username");
            password = pp.getProperty("jdbc.password");
            Class.forName(driver);
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (ClassNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
    
    public static Connection getConnection(){
        Connection conn = null;
        try {
            conn = DriverManager.getConnection(url, username, password);
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return conn;
    }
    
    public static void close(Connection conn,PreparedStatement ps,ResultSet rs){
        if(conn != null){
            if(rs != null){
                try {
                    rs.close();
                } catch (SQLException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
            }
            if(ps != null){
                try {
                    ps.close();
                } catch (SQLException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
            }
            try {
                conn.close();
            } catch (SQLException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
    }
    /*public static void main(String[] args) {
        System.out.println(DBUtil.getConnection());
    }*/
}

下面就可以使用数据库了.