一:页面调整
将上面的图片调整为下面的图片
二.登录功能
1. 验证码
- 将login.html改造成login.jsp验证码的图片img的src属性指向${pageContext.request.contextPath}/checkCodeServlet,CheckCodeServlet放在web–>servlet检查一下CheckCodeServlet路径是否为CheckCodeServlet,此时重启服务器可以看见验证码在登录页面显示
2. 验证码点击切换 - 使用js完成,在页面中给img验证码图片加了个超链接,点击图片和执行超链接里面的方法(refreshCode(); ),在这个方法里面只需要获取验证码的一个对象,换它的src并且给它加上时间戳,在script里面定义function refreshCode(){}
<script type="text/javascript">
//切换验证码
function refreshCode() {
//1.获取验证码图片对象
var vcode = document.getElementById("vcode");
//2.设置其src属性,加上时间戳
vcode.src = "${pageContext.request.contextPath}/checkCodeServlet?time="+new Date().getTime();
}
</script>
3. 数据库表的修改
- 首先我们先看登录的表单
<form action="${pageContext.request.contextPath}/loginServlet" method="post">
然后我们发现数据库中没有登录的字段,我们现在把input中属于用户名的属性name值改成username,属于密码的属性name值改成password,然后我们往数据库中加两列username,varchar类型,长度32。password也相同。接下来我们查询这个user表发现了password和username两列并且给其赋值为zhangsan,123。lisi,234。顺便修改一下实体类User加上username和password字段。
package cn.itcast.domain;
public class User {
private int id;
private String name;
private String gender;
private int age;
private String address;
private String qq;
private String email;
private String username;
private String password;
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getGender() {
return gender;
}
public void setGender(String gender) {
this.gender = gender;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
public String getAddress() {
return address;
}
public void setAddress(String address) {
this.address = address;
}
public String getQq() {
return qq;
}
public void setQq(String qq) {
this.qq = qq;
}
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
@Override
public String toString() {
return "User{" +
"id=" + id +
", name='" + name + '\'' +
", gender='" + gender + '\'' +
", age=" + age +
", address='" + address + '\'' +
", qq='" + qq + '\'' +
", email='" + email + '\'' +
", username='" + username + '\'' +
", password='" + password + '\'' +
'}';
}
}
4. 完成loginServlet编写
- 首先在web–>servlet中写一个LoginServlet,修改一下路径,因为它这个地方要提交数据是post请求,
- 所以第一步设置编码,
request.setCharacterEncoding("utf-8");
, - 第二步获取用户填写的验证码
String verifycode = request.getParameter("verifycode");
verifycode是输入框中验证码的name值。 - 第三步我们再来获取使用map集合把所有数据进行获取` Map<String, String[]> map = request.getParameterMap();
- 第四步验证码校验
校验验证码需要把session存储的生成的验证码和用户输入的验证码进行比对,生成的验证码在CheckCodeServlet,我们可以看到在session中我们存入了一个生成的验证码,request.getSession().setAttribute("CHECKCODE_SERVER",checkCode);
生成的验证码叫CHECKCODE_SERVER键,我们在LoginServlet中验证码校验获取session使用request.getsession();HttpSession session = request.getSession();
然后是session.getAttribute(“CHECKCODE_SERVER”);String checkcode_server = (String) session.getAttribute("CHECKCODE_SERVER");
这就是我们生成的一个验证码我们强行把它转换成字符串的形式,因为验证码本身就是字符串形式
注意:因为我们要保证验证码将来是一次性的,所以获取完验证码之后我们从session中移除CHECKCODE_SERVER键session.removeAttribute("CHECKCODE_SERVER");//确保验证码一次性
- 第五步验证码校验
然后进行判断验证码不正确我们给出提示信息,提示信息我们放在request中
if (!checkcode_server.equalsIgnoreCase(verifycode)){
//验证码不正确
//提示信息
request.setAttribute("login_msg","验证码错误!");
//跳转登录页面
request.getRequestDispatcher("/login.jsp").forward(request,response);
return;
}
- 第六步我们创建一个User对象并且我们封装这个对象
User user = new User();
try {
BeanUtils.populate(user,map);
} catch (IllegalAccessException e) {
e.printStackTrace();
} catch (InvocationTargetException e) {
e.printStackTrace();
}
这样子user对象中就有了对应的数据,用户名和密码,
- 第七步调用Service查询
//5.调用Service查询
UserService service = new UserServiceImpl();
User loginUser = service.login(user);
login()方法提前在UserServiceImpl中写好
@Override
public User login(User user) {
return dao.findUserByUsernameAndPassword(user.getUsername(),user.getPassword());
}
并且在UserDaoImpl中也加了
@Override
public User findUserByUsernameAndPassword(String username, String password) {
try {
String sql = "select * from user where username = ? and password = ?";
User user = template.queryForObject(sql, new BeanPropertyRowMapper<User>(User.class), username, password);
return user;
} catch (Exception e) {
e.printStackTrace();
return null;
}
}
- 第八步判断是否登录成功
//6.判断是否登录成功
if (loginUser != null){
//登录成功
//将用户存入session
session.setAttribute("user",loginUser);
//跳转页面
response.sendRedirect(request.getContextPath()+"/index.jsp");
}else{
//登录失败
//提示信息
request.setAttribute("login_msg","用户名或密码错误!");
//跳转登录页面
request.getRequestDispatcher("/login.jsp").forward(request,response);
}
- 最后我们在页面上显示错误消息将login.jsp最后的登录失败改成
<strong>${login_msg}</strong>
login.jsp
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<!DOCTYPE html>
<html lang="zh-CN">
<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>管理员登录</title>
<!-- 1. 导入CSS的全局样式 -->
<link href="css/bootstrap.min.css" rel="stylesheet">
<!-- 2. jQuery导入,建议使用1.9以上的版本 -->
<script src="js/jquery-2.1.0.min.js"></script>
<!-- 3. 导入bootstrap的js文件 -->
<script src="js/bootstrap.min.js"></script>
<script type="text/javascript">
//切换验证码
function refreshCode() {
//1.获取验证码图片对象
var vcode = document.getElementById("vcode");
//2.设置其src属性,加上时间戳
vcode.src = "${pageContext.request.contextPath}/checkCodeServlet?time="+new Date().getTime();
}
</script>
</head>
<body>
<div class="container" style="width: 400px;">
<h3 style="text-align: center;">管理员登录</h3>
<form action="${pageContext.request.contextPath}/loginServlet" method="post">
<div class="form-group">
<label for="user">用户名:</label>
<input type="text" name="username" class="form-control" id="user" placeholder="请输入用户名"/>
</div>
<div class="form-group">
<label for="password">密码:</label>
<input type="password" name="password" class="form-control" id="password" placeholder="请输入密码"/>
</div>
<div class="form-inline">
<label for="vcode">验证码:</label>
<input type="text" name="verifycode" class="form-control" id="verifycode" placeholder="请输入验证码" style="width: 120px;"/>
<a href="javascript:refreshCode();">
<img src="${pageContext.request.contextPath}/checkCodeServlet" title="看不清点击刷新" id="vcode"/>
</a>
</div>
<hr/>
<div class="form-group" style="text-align: center;">
<input class="btn btn btn-primary" type="submit" value="登录">
</div>
</form>
<!-- 出错显示的信息框 -->
<div class="alert alert-warning alert-dismissible" role="alert">
<button type="button" class="close" data-dismiss="alert" >
<span>×</span></button>
<strong>${login_msg}</strong>
</div>
</div>
</body>
</html>
LoginServlet
package cn.itcast.web.servlet;
import cn.itcast.domain.User;
import cn.itcast.service.UserService;
import cn.itcast.service.impl.UserServiceImpl;
import org.apache.commons.beanutils.BeanUtils;
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 java.io.IOException;
import java.lang.reflect.InvocationTargetException;
import java.util.Map;
@WebServlet("/loginServlet")
public class LoginServlet extends HttpServlet {
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
//1.设置编码
request.setCharacterEncoding("utf-8");
//2.获取数据
//2.1获取用户填写验证码
String verifycode = request.getParameter("verifycode");
//3.验证码校验
HttpSession session = request.getSession();
String checkcode_server = (String) session.getAttribute("CHECKCODE_SERVER");
session.removeAttribute("CHECKCODE_SERVER");//确保验证码一次性
if (!checkcode_server.equalsIgnoreCase(verifycode)){
//验证码不正确
//提示信息
request.setAttribute("login_msg","验证码错误!");
//跳转登录页面
request.getRequestDispatcher("/login.jsp").forward(request,response);
return;
}
Map<String, String[]> map = request.getParameterMap();
//4.封装User对象
User user = new User();
try {
BeanUtils.populate(user,map);
} catch (IllegalAccessException e) {
e.printStackTrace();
} catch (InvocationTargetException e) {
e.printStackTrace();
}
//5.调用Service查询
UserService service = new UserServiceImpl();
User loginUser = service.login(user);
//6.判断是否登录成功
if (loginUser != null){
//登录成功
//将用户存入session
session.setAttribute("user",loginUser);
//跳转页面
response.sendRedirect(request.getContextPath()+"/index.jsp");
}else{
//登录失败
//提示信息
request.setAttribute("login_msg","用户名或密码错误!");
//跳转登录页面
request.getRequestDispatcher("/login.jsp").forward(request,response);
}
}
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
this.doPost(request, response);
}
}