Servlet+jsp实现一个极简单的登录功能

1，index.jsp

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>登录页面</title>
</head>
<body>
<form action="${pageContext.request.contextPath}/loginServlet" method="post">
    <table>
        <tr align="center">
            <td>请输入用户名：<input type="text" name="username" size="20">
            </td>
        </tr>
        <tr align="center">
            <td>请输入密码：&nbsp;&nbsp;<input type="password" name="password" size="20">
            </td>
        </tr>
        <tr align="center">
        <td><input type="submit" value="登录" /> <input type="reset" /></td>
        </tr>
    </table>
</form>
</body>
</html>

2，info.jsp

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>登录提示</title>
</head>
<body>
<p><%= request.getAttribute("info") %></p>
<p><a href="index.jsp">返回首页</a></p>
</body>
</html>

3，LoginServlet.java

package com.servlet;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@WebServlet("/loginServlet")
public class LoginServlet extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        request.setCharacterEncoding("utf-8");
        response.setCharacterEncoding("utf-8");

        String username = request.getParameter("username");
        String password = request.getParameter("password");
        String info = "";
        if("admin".equals(username) && "123456".equals(password)){
            info = "欢迎你" + username + "！";
        }else{
            info = "用户名或密码错误！";
        }
        request.setAttribute("info", info);
        request.getRequestDispatcher("info.jsp").forward(request,response);
    }

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        doPost(request,response);
    }
}

参考：https://blog.csdn.net/qq_40956679/article/details/83589458

johnfht

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Servlet+jsp实现一个极简单的登录功能

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