Servlet校验密码之Mariadb篇

Servlet校验密码之Mariadb篇

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 先放图～～

数据库：

　效果图：

 整体来说与上一篇差距不大，这次主要是采用数据库来进行校验，我使用的是Mariadb，安装与配置不用我说

主要有一点，导入连接器jar包时，不仅要在项目中导入，还要在Tomcat/lib中导入，不然会报ClassNotFoundException

1.第一步：简单的连接器实现

package pers.eddy.login;
import java.sql.*;

public class MySqlOperator {
    private static final String driver = "org.mariadb.jdbc.Driver";
    private static final String url = "jdbc:mariadb://localhost:3306/hello";
    private static final String user = "root";
    private static final String pswd = "admin";

    private static Connection conn;

    static {
        try {
            Class.forName(driver);
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        }
    }

    public static boolean check(String usr, String psd) {
        try {
            conn = DriverManager.getConnection(url, user, pswd);
            Statement stat = conn.createStatement();
            ResultSet rs = stat.executeQuery("select * from users where usr=\""+usr+"\" and psd=\""+psd+"\";");
            conn.close();
            return rs.next() ? true:false;
        } catch (Exception e) {
            e.printStackTrace();
        }
        return false;
    }

}

2.修改doGet()

   @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        String usr = req.getParameter("usr");
        String psd = req.getParameter("psd");
        if (MySqlOperator.check(usr, psd)) {
            req.setAttribute("usr", usr);
            req.setAttribute("psd", psd);
            req.getRequestDispatcher("/welcome.jsp").forward(req, resp);
        } else {
            resp.sendRedirect("/web_war_exploded/");
        }
    }

源码链接: https://pan.baidu.com/s/1DXCUybmk3tg4i2tlYkNyVQ 提取码: uwdv