旅游网站系统----登录功能

àì夳堔傛蜴生んèń 2023-10-04 17:48 22阅读 0赞

上一篇》》[注册---邮件激活\_无尽的沉默的博客-CSDN博客][---_-CSDN]

## 一.登录功能原理分析 ##

![watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBA5peg5bC955qE5rKJ6buY_size_20_color_FFFFFF_t_70_g_se_x_16][]

## 二.代码实现 ##

### 2.1前端代码 ###

script中的ajax异步提交（绑定登录按钮事件）

![watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBA5peg5bC955qE5rKJ6buY_size_20_color_FFFFFF_t_70_g_se_x_16 1][]

**完整的的login.html**

<!DOCTYPE html>
    <html>
    
    <head>
        <meta charset="utf-8">
        <meta http-equiv="X-UA-Compatible" content="IE=edge">
        <meta name="viewport" content="width=device-width, initial-scale=1">
        <title>黑马旅游网-登录</title>  
        <link rel="stylesheet" type="text/css" href="css/common.css">
        <link rel="stylesheet" type="text/css" href="css/login.css">
        
        
        
          
        
    	
    	<script src="js/jquery-3.3.1.js"></script>
    	
    	<script type="text/javascript">
    	   //1.给登录事件绑定点击事件
    	   //2.发送ajax请求，提交表单数据
    	   //3.处理响应的数据
    	   $(function(){
    		   $("#btn_sub").click(function() {
    			   $.post(
    					   "loginServlet",   // 请求的页面处理
    					   $("#loginForm").serialize(),  //发送的表单数据
    					   function(data) {  //传过来处理后的数据
    						if(data.flag){
    							//登陆成功,跳转页面
    							location.href="index.html";
    						}
    						else{
    							//登陆失败，提示登录信息
    							$("#errorMsg").html(data.errorMsg);
    						}
    				}	   
    			   );
    		   });
    	   });
    	</script>
    </head>
    
    <body>
    
    <div id="header"></div>
        
        <section id="login_wrap">
            <div class="fullscreen-bg" style="background: url(images/login_bg.png);height: 532px;">
            	
            </div>
            <div class="login-box">
            	<div class="title">
            		<img src="images/login_logo.png" alt="">
            		<span>欢迎登录淘淘旅游账户</span>
            	</div>
            	<div class="login_inner">
    				
    				
            		<div id="errorMsg" class="alert alert-danger" ></div>
    				<form id="loginForm" action="" method="post" accept-charset="utf-8">
            			<input type="hidden" name="action" value="login"/>
    					<input name="username" type="text" placeholder="请输入账号" autocomplete="off">
            			<input name="password" type="text" placeholder="请输入密码" autocomplete="off">
            			<div class="verify">
    					<input name="check" type="text" placeholder="请输入验证码" autocomplete="off">
    					<span><img src="checkCode" alt="" onclick="changeCheckCode(this)"></span>
    					<script type="text/javascript">
    						//图片点击事件
    						function changeCheckCode(img) {
    							img.src="checkCode?"+new Date().getTime();
    						}
    					</script>
    			</div>
    			<div class="submit_btn">
            				<button type="button" id="btn_sub">登录</button>
            				<div class="auto_login">
            					<input type="checkbox" name="" class="checkbox">
            					<span>自动登录</span>
            				</div>        				
            			</div>        			       		
            		</form>
            		<div class="reg">没有账户？<a href="javascript:;">立即注册</a></div>
            	</div>
            </div>
        </section>
        
        <div id="footer"></div>
        
        <script src="js/jquery-1.11.0.min.js"></script>
        
        <script src="js/bootstrap.min.js"></script>
        
        <script type="text/javascript" src="js/include.js"></script>
    </body>
    
    </html>

### 2.2后端代码 ###

#### 2.2.1编写Web层的Loginservlet ####

package cn.itcast.travel.web.servlet;
    
    import java.io.IOException;
    import java.lang.reflect.InvocationTargetException;
    import java.util.Map;
    
    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 javax.servlet.http.HttpSession;
    
    import org.apache.commons.beanutils.BeanUtils;
    
    import com.fasterxml.jackson.databind.ObjectMapper;
    
    import cn.itcast.travel.dao.UserDao;
    import cn.itcast.travel.dao.impl.UserDaoImpl;
    import cn.itcast.travel.domain.ResultInfo;
    import cn.itcast.travel.domain.User;
    import cn.itcast.travel.service.UserService;
    import cn.itcast.travel.service.impl.UserServiceImpl;
    
    /**
     * Servlet implementation class LoginServlet
     */
    @WebServlet("/loginServlet")
    public class LoginServlet extends HttpServlet {
    	private static final long serialVersionUID = 1L;
           
    	/**
    	 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
    	 */
    	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    		// TODO Auto-generated method stub
    		this.doPost(request, response);
    	}
    	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    		//获取验证码
    		String code=request.getParameter("check");
    		HttpSession session=request.getSession();
    		String scode=(String) session.getAttribute("CHECKCODE_SERVER");
    		session.removeAttribute("CHECKCODE_SERVER");  //保证验证码只能用一次，防止倒退后验证码还能使用
    		if(scode==null||!scode.equalsIgnoreCase(code)) {
    			//验证码错误
    			ResultInfo resultInfo=new ResultInfo();
    			resultInfo.setFlag(false);
    			resultInfo.setErrorMsg("验证码错误");
    			//将对象变成json格式
    			ObjectMapper obmMapper=new ObjectMapper();
    			response.setContentType("application/json;charset=utf-8");
    			String json=obmMapper.writeValueAsString(resultInfo);
    			//回写客户端
    			response.getWriter().write(json);
    		}
    		else {
    			//1.获取用户名和密码
    			Map<String, String[]> map=request.getParameterMap();
    			//2.封装用户对象
    			User user=new User();
    			try {
    				BeanUtils.populate(user, map);
    			} catch (IllegalAccessException | InvocationTargetException e) {
    				// TODO Auto-generated catch block
    				e.printStackTrace();
    			}
    			//3.调用service层的方法查询
    			UserService userService=new UserServiceImpl();
    			
    			//根据用户的用户名和用户密码查询用户所有的信息
    			User user2=userService.login(user);
    			
    			ResultInfo resultInfo=new ResultInfo();//响应的信息
    			//4.判断用户是否存在
    			if(user2!=null) {
    				//判断激活码是否激活
    				if(!"Y".equals(user2.getStatus())) {//没有激活激活码
    					//如果没有激活，就去根据用户的激活码去激活
    					resultInfo.setFlag(false);
    					resultInfo.setErrorMsg("激活码尚未激活，请先激活");
    	//				UserDao userDao=new UserDaoImpl();
    	//				userDao.updateStatus(user2);//根据用户去修改激活状态
    				}
    				else {  //激活码已经激活，登录成功，前台进行跳转
    					resultInfo.setFlag(true);
    					//登录成功且激活码已经激活
    					request.getSession().setAttribute("user",user2);//登录成功标记存储到session
    				}
    			}
    			else {
    				//登录不成功，用户名或者密码不正确
    				resultInfo.setFlag(false);
    				resultInfo.setErrorMsg("用户名或者密码不正确");
    			}
    			//将对象变成json格式
    			ObjectMapper obmMapper=new ObjectMapper();
    			response.setContentType("application/json;charset=utf-8");
    			String json=obmMapper.writeValueAsString(resultInfo);
    			//回写客户端
    			response.getWriter().write(json);
    
    	  }//else
    	}
    }

#### 2.2.2编写servcie层的UserService类中的login方法 ####

public User login(User user) {
        return userDao.findByUsernameAndPassword(user.getUsername(),user.getPassword());
    }

完整的UserService抽象类以及UserServiceImpl实现类

UserService抽象类

package cn.itcast.travel.service;
    
    import cn.itcast.travel.domain.User;
    
    public interface UserService {
    	//注册用户
    	public boolean regist(User user);
    
    	public boolean active(String code);
    
    	public User login(User user);
    }

UserServiceImpl实现类

package cn.itcast.travel.service.impl;
    
    import java.util.UUID;
    
    import cn.itcast.travel.dao.UserDao;
    import cn.itcast.travel.dao.impl.UserDaoImpl;
    import cn.itcast.travel.domain.User;
    import cn.itcast.travel.service.UserService;
    import cn.itcast.travel.util.MailUtils;
    import cn.itcast.travel.util.UuidUtil;
    
    public class UserServiceImpl implements UserService {
    	UserDao uDao=new UserDaoImpl();
        //注册用户
    	@Override
    	public boolean regist(User user) {
    		// 通过用户名来查询用户信息
    		User user2=uDao.findByUsername(user.getUsername());
    		if(user2!=null) {
    			//说明已经注册了信息,用户名注册失败
    			return false;
    		}
    		//没有注册，保存用户的信息
    		//生成激活码，用户的唯一标志
    		user.setCode(UuidUtil.getUuid());
    		//设置激活状态
    		user.setStatus("N");
    		//保存用户的信息
    		System.out.println(user);
    		uDao.save(user);
    		//激活邮件发送，邮件正文
    	    String content="<a href='http://localhost/travel/activeUserServlet?code="+user.getCode()+"'>点击激活【淘淘旅游网】</a>";
    		MailUtils.sendMail(user.getEmail(), content, "激活邮件");
    		return true;
    	}
        //激活激活码
    	@Override
    	public boolean active(String code) {
    		//根据激活码查询用户信息 ，注意激活码是唯一的
    		User user =uDao.findByCode(code);
    		if(user!=null) { //存在该用户，调用dao的方法修改激活状态
    			//如果存在该用户，根据用户修改激活状态
    			uDao.updateStatus(user);
    			return true;
    		}
    		else {
    			return false;
    		}
    		
    	}
    	//登录查询检测
    	@Override
    	public User login(User user) {
    		// TODO Auto-generated method stub
    		return uDao.findByUsernameAndPassword(user);
    	}
    
    }

#### 2.2.3编写DAO层的UserDaoImpl类中的findByUsernameAndPassword()方法 ####

public User findByUsernameAndPassword(String username, String password) {
        User user = null;
        try {
            //1.定义sql
            String sql = "select * from tab_user where username = ? and password = ?";
            //2.执行sql
            user = template.queryForObject(sql, new BeanPropertyRowMapper<User>(User.class), username,password);
        } catch (Exception e) {
    
        }
    
        return user;
    }

完整的UserDao抽象类以及UserDaoImpl实现类

package cn.itcast.travel.dao;
    import cn.itcast.travel.domain.User;
    
    public interface UserDao {
    	  //根据用户名来查询用户信息
          public User findByUsername(String username);
          //用户信息保存
          public void save(User user);
          //根据用户来修改用户的激活码
    	  public void updateStatus(User user);
    	  //根据激活码查询用户信息
    	  public User findByCode(String code);
    	  //登录根据用户名和密码查询
    	  public User findByUsernameAndPassword(User user);
          
    }

package cn.itcast.travel.dao.impl;
    
    import org.springframework.dao.DataAccessException;
    import org.springframework.jdbc.core.BeanPropertyRowMapper;
    import org.springframework.jdbc.core.JdbcTemplate;
    import cn.itcast.travel.util.JDBCUtils;
    import cn.itcast.travel.dao.UserDao;
    import cn.itcast.travel.domain.User;
    
    
    public class UserDaoImpl implements UserDao {
    	//操作数据库的对象
    	private JdbcTemplate jdbcTemplate=new JdbcTemplate(JDBCUtils.getDataSource());
    	@Override
    	public User findByUsername(String username) {
    		//根据用户名来查询用户信息
    		User user=null;
    		try {//这个trycatch是为了防止jdbctemplate查询时没查到用户，封装用户会出异常，不是返回null 而设置的
    			// 1.编写sql语句
    			String sql="select* from tab_user where username = ?";
    			//2.执行sql语句
    			user = jdbcTemplate.queryForObject(sql, new BeanPropertyRowMapper<User>(User.class),username);
    		} catch (DataAccessException e) {
    		}
    		return user;
    	}
    	
        //注册成功后保存用户信息
    	@Override
    	public void save(User user) {
    		// 1.定义sql
    		String sql="insert into tab_user(username,password,name,birthday,sex,telephone,email,status,code) values(?,?,?,?,?,?,?,?,?)";
    		//2.执行sql语句
    		jdbcTemplate.update(sql,user.getUsername(),
    				                user.getPassword(),
    				                user.getName(),
    				                user.getBirthday(),
    				                user.getSex(),
    				                user.getTelephone(),
    				                user.getEmail(),
    				                user.getStatus(),
    				                user.getCode()
    				           );
    		
    	}
    	
        //根据指定的用户来修改用户的激活码状态
    	@Override
    	public void updateStatus(User user) {
    		// 1.编写sql语句
    		String sql="update tab_user set status= 'Y' where code= ?";
    		//执行sql语句
    		jdbcTemplate.update(sql,user.getCode());
    	}
    	
        //根据激活码来查询用户的信息
    	@Override
    	public User findByCode(String code) {
    		
    		
    		User user=null;
    		try {
    			// 1.编写sql语句
    			String sql="select * from tab_user where code= ?";
    			//2.执行sql,返回user
    			user = jdbcTemplate.queryForObject(sql, new BeanPropertyRowMapper<User>(User.class),code);
    		} catch (DataAccessException e) {
    			e.printStackTrace();
    		}
    		return user;
    	}
        //根据用户名和密码查询
    	@Override
    	public User findByUsernameAndPassword(User user) {
    		//根据用户名和密码来查询用户所有信息
    		User user2=null;
    		try {//这个trycatch是为了防止jdbctemplate查询时没查到用户，封装用户会出异常，不是返回null 而设置的
    			 // 1.编写sql语句
    			 String sql="select* from tab_user where username = ? and password= ?";
    			 //2.执行sql语句
    			 user2 = jdbcTemplate.queryForObject(sql, new BeanPropertyRowMapper<User>(User.class),user.getUsername(),user.getPassword());
    		} catch (Exception e) {
    	    }
    		return user2;
    	}  
    }

#### 2.2.4 index页面中（登录后）用户姓名提示功能 ####

**效果：**

![watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBA5peg5bC955qE5rKJ6buY_size_15_color_FFFFFF_t_70_g_se_x_16][]

**header.html代码**

**findUserServlet代码**

//从session中获取登录用户
    Object user = request.getSession().getAttribute("user");
    //将user写回客户端
    
    ObjectMapper mapper = new ObjectMapper();
    response.setContentType("application/json;charset=utf-8");
    mapper.writeValue(response.getOutputStream(),user);

完整的 **findUserServlet类**

package cn.itcast.travel.web.servlet;
    
    import java.io.IOException;
    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 com.fasterxml.jackson.databind.ObjectMapper;
    
    import cn.itcast.travel.domain.User;
    
    /**
     * Servlet implementation class FindUserServlet
     */
    @WebServlet("/findUserServlet")
    public class FindUserServlet extends HttpServlet {
    	private static final long serialVersionUID = 1L;
           
    	/**
    	 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
    	 */
    	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    		// TODO Auto-generated method stub
    		this.doPost(request, response);
    	}
    
    	/**
    	 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
    	 */
    	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    		  //1.登陆成功且已经激活后后 获取存储在session域中的user
    		   Object user=request.getSession().getAttribute("user");
    		   //2.将user写会到客户端
    		   ObjectMapper objectMapper=new ObjectMapper();
    		   response.setContentType("application/json;charset=utf-8");
    		   objectMapper.writeValue(response.getOutputStream(),user);
    	}
    }

#### 2.2.5 退出 ####

什么叫做登录了？session中有user对象。

实现步骤：

1.  访问servlet，将session销毁
2.  跳转到登录页面

**代码实现：**

Header.html

![watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBA5peg5bC955qE5rKJ6buY_size_20_color_FFFFFF_t_70_g_se_x_16 2][]

完整的Header.html

<script type="text/javascript">
        $(function () {
           $.get("findUserServlet",{},function (data) {  //处理后返回的信息
               //{uid:1,name:'李四'}
               var msg = "欢迎回来，"+data.name; //返回处理后的user的json格式 直接user.name
               $("#span_usernaem").html(msg);
    
           }); 
        });
    </script>
        <header id="header">
            <div class="top_banner">
                <img src="images/top_banner.jpg" alt="">
            </div>
            <div class="shortcut">
                
                <div class="login_out">
                    <a href="login.html">登录</a>
                    <a href="register.html">注册</a>
                </div>
                
                <div class="login">
                    <span id="span_usernaem"></span>
                    <a href="myfavorite.html" class="collection">我的收藏</a>
                    <a href="javascript:location.href='exitServlet';">退出</a>
                </div>
            </div>
            <div class="header_wrap">
                <div class="topbar">
                    <div class="logo">
                        <a href="/"><img src="images/logo.jpg" alt=""></a>
                    </div>
                    <div class="search">
                        <input name="" type="text" placeholder="请输入路线名称" class="search_input" autocomplete="off">
                        <a href="javascript:;" class="search-button">搜索</a>
                    </div>
                    <div class="hottel">
                        <div class="hot_pic">
                            <img src="images/hot_tel.jpg" alt="">
                        </div>
                        <div class="hot_tel">
                            <p class="hot_time">客服热线(9:00-6:00)</p>
                            <p class="hot_num">400-618-9090</p>
                        </div>
                    </div>
                </div>
            </div>
        </header>
        
         
        <div class="navitem">
            <ul class="nav">
                <li class="nav-active"><a href="index.html">首页</a></li>
                <li><a href="route_list.html">门票</a></li>
                <li><a href="route_list.html">酒店</a></li>
                <li><a href="route_list.html">香港车票</a></li>
                <li><a href="route_list.html">出境游</a></li>
                <li><a href="route_list.html">国内游</a></li>
                <li><a href="route_list.html">港澳游</a></li>
                <li><a href="route_list.html">抱团定制</a></li>
                <li><a href="route_list.html">全球自由行</a></li>
                <li><a href="favoriterank.html">收藏排行榜</a></li>
            </ul>
        </div>

**在exitServlet中销毁session域的user属性**

package cn.itcast.travel.web.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("/exitServlet")
    public class ExitServlet extends HttpServlet {
        protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
            //1.销毁session
            request.getSession().invalidate();
            //2.跳转登录页面
            response.sendRedirect(request.getContextPath()+"/login.html");
        }
    
        protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
            this.doPost(request, response);
        }
    }

[---_-CSDN]: https://blog.csdn.net/hgnuxc_1993/article/details/124248213?spm=1001.2014.3001.5502
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