第十次作业 







package user.web.servlet;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import cn.itcast.commons.CommonUtils;

import user.domain.User;
import user.service.UserException;
import user.service.UserService;


public class LoginServlet extends HttpServlet {

    public void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        request.setCharacterEncoding("utf-8");
        response.setContentType("text/html;charset=utf-8");

        // 依赖UserService
        UserService userService = new UserService();
        
        /*
         * 1、封装表单数据到User form中
         * 2、调用service的login()方法，得到返回的User user对象
         *     > 如果抛出异常：获取异常信息，保存到request域，再保存form，转发到login.jsp 
         *  > 如果没有异常，保存返回值到session中，重定向到welcome.jsp 
         */
        
        User form = CommonUtils.toBean(request.getParameterMap(), User.class);
        try {
            UserService us = new UserService();
            User user = us.login(form);
            request.getSession().setAttribute("sessionUser", user);
            response.sendRedirect(request.getContextPath()+"/user/welcome.jsp");
        } catch (UserException e) {
            request.setAttribute("msg", e.getMessage());
            request.setAttribute("user", form);
            request.getRequestDispatcher("/user/login.jsp").forward(request, response);
        }
    }

}

LoginServlet




 


<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <base href="<%=basePath%>">
    
    <title>My JSP 'login.jsp' starting page</title>
    
    <meta http-equiv="pragma" content="no-cache">
    <meta http-equiv="cache-control" content="no-cache">
    <meta http-equiv="expires" content="0">    
    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
    <meta http-equiv="description" content="This is my page">
    <!--
    <link rel="stylesheet" type="text/css" href="styles.css">
    -->

  </head>
  
  <body>
<h1>登录</h1>
<p style="color: red; font-weight: 900">${msg }</p>
<form action="<c:url value='/LoginServlet'/>" method="post">
    用户名：<input type="text" name="username" value="${user.username }" /><br/>
    密   码：<input type="password" name="password" value="${user.password }"/><br/>
    <input type="submit" value="登录"/>
</form>
  </body>
</html>

login.jsp






 






 






        

            posted on 
2020-05-29 12:40 
丛雪 
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