用户登录验证数据库

<!DOCTYPE html>
<html lang="en">
<head><meta charset="UTF-8"><title>登录</title><link rel="stylesheet" type="text/css" href="login.css">
</head>
<body background="1.jpg"><form action="/day14_login_war_exploded/loginServlet" method="post" class="box" name="form1"><h2 align="center">Login</h2><input class="ienp" type="text" name="username" placeholder="请输入用户名" ><input class="ienp" type="password" name="password" placeholder="请输入密码" ><input type="radio" name="permissions" value="管理员" checked>管理员<input type="radio" name="permissions" value="学生" >学生<input type="radio" name="permissions" value="教师" >教师<input type="submit" class="ienp"  value="登录"><input type="reset" class="ienp"  onclick="formReset()" value="重置"></form>
</body><script>function formReset(){document.getElementById("from1").reset()}</script>
</html>

JDBCUtils.java

public class JDBCUtils {private static DataSource dataSource;static {try {//加载配置文件Properties properties = new Properties();InputStream resourceAsStream = JDBCUtils.class.getClassLoader().getResourceAsStream("druid.properties");properties.load(resourceAsStream);//初始化连接池对象
//            ds=DruidDataSourceFactory.createDataSource(properties);dataSource = DruidDataSourceFactory.createDataSource(properties);} catch (IOException e) {e.printStackTrace();} catch (Exception e) {e.printStackTrace();}}public static DataSource getDataSource() {return dataSource;}public static Connection getConnection() throws SQLException{return dataSource.getConnection();}
}

User.java

public class User {private int id;private  String username;private  String password;private String permissions;public String getPermissions() {return permissions;}public void setPermissions(String permissions) {this.permissions = permissions;}public int getId() {return id;}public void setId(int id) {this.id = id;}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;}@Overridepublic String toString() {return "User{" +"id=" + id +", username='" + username + '\'' +", password='" + password + '\'' +", permissions='" + permissions + '\'' +'}';}
}

UserDao.java

public class UserDao {private JdbcTemplate jdbcTemplate = new JdbcTemplate(JDBCUtils.getDataSource());public User login(User loginUser) {//ctrl+alt+ttry {System.out.println(loginUser.getPermissions());String sql = "select * from user where username=? and password=? and permissions=?";User user = jdbcTemplate.queryForObject(sql,new BeanPropertyRowMapper<User>(User.class), loginUser.getUsername(),loginUser.getPassword(),loginUser.getPermissions());return user;} catch (DataAccessException e) {
//            e.printStackTrace();return null;}}}

LoginServlet.java

@WebServlet( "/loginServlet")
public class LoginServlet extends HttpServlet {protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {this.doGet(request,response);}protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {//设置编码request.setCharacterEncoding("utf-8");//获取请求参数
//        String username = request.getParameter("username");
//        String password = request.getParameter("password");
//        //封装user对象
//        User loginUser = new User();
//        loginUser.setUsername(username);
//        loginUser.setPassword(password);Map<String, String[]> parameterMap = request.getParameterMap();//创建User对象User loginUser = new User();try {BeanUtils.populate(loginUser,parameterMap);System.out.println(loginUser);} catch (IllegalAccessException | InvocationTargetException e) {e.printStackTrace();}//调用UserDao方法UserDao userDao = new UserDao();User user = userDao.login(loginUser);if(user==null){request.getRequestDispatcher("/failServlet").forward(request,response);}else {//存储数据request.setAttribute("user",user);request.getRequestDispatcher("/successServlet").forward(request,response);}}
}

SuccessServlet.java

@WebServlet("/successServlet")
public class SuccessServlet extends HttpServlet {protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {//获取request域中共享的user对象User user = (User) request.getAttribute("user");if(user!=null) {response.setContentType("text/html;charset=utf-8");response.getWriter().write("登陆成功"+user.getUsername()+"欢迎您");}}protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {this.doPost(request,response);}
}

FailServlet.java

@WebServlet( "/failServlet")
public class FailServlet extends HttpServlet {protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {response.setContentType("text/html;charset=utf-8");response.getWriter().write("登陆失败，用户名或者密码错误");}protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {this.doPost(request,response);}
}

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