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Java Web实战项目-六

Posted on Edited on In Valine:

上回已经搞定了登陆的问题，那么登陆之后页面就要转到首页，并将原来登陆字样改为已经登陆的用户名字样，这里主要用到的是session类。

  1. 改写LoginServlet
    在登陆验证成功后将session里的用户名填入request，并执行转发：

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    public void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        
        String username = request.getParameter("username").trim();
        String password = request.getParameter("password").trim();

            
                
                String resource = "mybatis-config.xml";
                InputStream inputStream = Resources.getResourceAsStream(resource);
                SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder()
                        .build(inputStream);
                SqlSession session=sqlSessionFactory.openSession();
                 Map<String,Object> params = new HashMap<>();
                 params.put("username", username);
                    params.put("password", password);
                    List<User> us = session.selectList("getPassword",username);
                    User user = us.get(0);
                    if(user.getPassword().equals(password)){
                        request.getSession().setAttribute("n", username);
                        request.getRequestDispatcher("/index.jsp").forward(request,response);
                    }
            
            

        }

  2. 改写Header.jsp
    使用jsp的taglib自定义标签，要先引用相关的包 

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    <%@ page language="java" contentType="text/html; charset=UTF-8"
        pageEncoding="UTF-8"%>
        <%@taglib uri="http://java.sun.com/jsp/jstl/core"  prefix="c"%>
            <div class="col-md-12 column" >
                <ul class="nav nav-tabs">
                    <li style="font-size:20px;">
                         <a href="index.jsp">首页</a>
                    </li>
                       <c:choose>
                        <c:when  test="${empty sessionScope.n}">
                    <li style="font-size:20px;">
                         <a href="login.jsp">登陆</a>
                    </li>
                    </c:when>
            <c:otherwise>
            <li style="font-size:20px;">
            <a href="javascript:void(0)">欢迎您，${sessionScope.n}</a>
            </li></c:otherwise></c:choose>
                    <li style="font-size:20px;">
                         <a href="#">商店</a>
                    </li>
                    
                </ul>
            </div>