如何在Apache Tomcat中通过已部署的JSP应用程序访问MySQL数据库

<%
    String url = "jdbc:mysql://localhost:3306/mydatabase";
    String username = "root";
    String password = "password";
    
    Connection conn = null;
    Statement stmt = null;
    ResultSet rs = null;
    
    try {
        Class.forName("com.mysql.jdbc.Driver");
        conn = DriverManager.getConnection(url, username, password);
        
        stmt = conn.createStatement();
        rs = stmt.executeQuery("SELECT * FROM mytable");
        
        while (rs.next()) {
            // 处理查询结果
            String column1 = rs.getString("column1");
            String column2 = rs.getString("column2");
            
            // 输出结果
            out.println("Column 1: " + column1 + "<br>");
            out.println("Column 2: " + column2 + "<br>");
        }
    } catch (Exception e) {
        e.printStackTrace();
    } finally {
        // 关闭数据库连接
        if (rs != null) {
            try {
                rs.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
        if (stmt != null) {
            try {
                stmt.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
        if (conn != null) {
            try {
                conn.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
    }
%>