【Java】【JSP】jsp入门-实现登陆

作者: JerichoPH | 来源:发表于2017-04-09 18:14 被阅读62次

【Java】【JSP】jsp入门-实现登陆
Jsp入门须知
0527-jsp-概/运行
JavaWeb学习记录-Jsp登录注册功能完整示例
jsp学习 EL JSTL C标签
day_1_13 jsp&el&jstl
JavaWeb-JSP
05_JSP&EL&JSTL&MVC
在Servlet中实现页面转发
JAVAEE——动态页面技术JSP EL JSTL

login.jsp

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>Login</title>
</head>
<body>
<form action="/doLogin" method="post">
    <label>账号: <input type="text" name="uid"></label>
    <label>密码: <input type="text" name="pwd"></label>
    <button>登陆</button>
</form>
</body>
</html>

resutl.jsp

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>Title</title>
</head>
<body>
<%
    out.print(request.getAttribute("msg"));
    if (request.getAttribute("res").equals("1")) {
        out.print("<a href='/doLogin'>退出登录</a>");
    }
%>
</body>
</html>

LoginServlet

package com.stu.demo;

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;
import java.io.PrintWriter;

@WebServlet(name = "LoginServlet")
public class LoginServlet extends HttpServlet {
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    
}

protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    request.setCharacterEncoding("utf-8");
    response.setContentType("text/html; charset=utf-8");
    PrintWriter out = response.getWriter();

    request.getRequestDispatcher("/login.jsp").forward(request, response);
}
}

DoLoginServlet

package com.stu.demo;

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;
import java.io.PrintWriter;

@WebServlet(name = "DoLoginServlet")
public class DoLoginServlet extends HttpServlet {
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    request.setCharacterEncoding("utf-8");
    response.setContentType("text/html; charset=utf-8");
    PrintWriter out = response.getWriter();

    String uid = request.getParameter("uid");
    String pwd = request.getParameter("pwd");
    if (uid.equals("123") && pwd.equals("321")) {
        request.setAttribute("msg", "登陆成功:" + uid);
        request.setAttribute("res", "1");
    } else {
        request.setAttribute("msg", "登陆失败");
        request.setAttribute("res", "0");
    }
    request.getRequestDispatcher("/result.jsp").forward(request, response);
}

protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    request.getRequestDispatcher("/login.jsp").forward(request, response);
}
}