用servlet进行用户名和密码校验

用servlet进行用户名和密码校验


 

先来看看效果~~

这里为了方便查看,密码框并没有使用password输入框,而是使用了text框

总体来说思路还是比较简单

1.先来个form,配置好action和method,代码如下

1   <form action="login" method="get">
2     用户名:<input type="text" name="usr"><br/>
3     密码:<input type="text" name="psd"><br/>
4     <input type="submit" value="登录">
5   </form>

2.然后编写判断逻辑代码--LoginCheckServlet,就几个判断总体来说还是比较简单,主要是注意跳转welcome时传入值进去

public class LoginCheckServlet extends HttpServlet {
    private final static String USR = "peter";
    private final static String PSD = "admin";


    public LoginCheckServlet() {
        super();
    }

    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        String usr = req.getParameter("usr");
        String psd = req.getParameter("psd");
        if (null != usr && null != psd) {
            if (!usr.equals(USR)) {
                resp.sendRedirect("/web_war_exploded/");
            } else if (!psd.equals(PSD)) {
                resp.sendRedirect("/web_war_exploded/");
            } else {
                System.out.println("登陆成功");
                req.setAttribute("usr", usr);
                req.setAttribute("psd", psd);
                req.getRequestDispatcher("/welcome.jsp").forward(req, resp);
            }
        }
    }

}

3.跳转后的welcome.jsp,用EL表达式将值显示出来就差不多了

<%--
  Created by IntelliJ IDEA.
  User: eddy
  Date: 19-3-30
  Time: 下午4:52
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>Welcome</title>
    <h1> Welcome to this page!! </h1>
    用户名: ${usr} <br/>
    密码:${psd}
</head>
<body>

</body>
</html>

链接: https://pan.baidu.com/s/1KIgvNW3G6oj6Gsw-x0o7xQ 提取码: u63e 

posted @ 2019-03-30 17:27  eddy_s  阅读(558)  评论(0编辑  收藏  举报