旅游网站系统----登录功能
上一篇》》注册---邮件激活_无尽的沉默的博客-CSDN博客
一.登录功能原理分析
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）
完整的的login.html
黑马旅游网-登录
欢迎登录淘淘旅游账户
没有账户？立即注册
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 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="点击激活【淘淘旅游网】";
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.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.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.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.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：
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：
- 访问servlet，将session销毁
- 跳转到登录页面
代码实现：
Header.html
完整的Header.html
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);
}
}