cookie技术实现自动登录+验证用户名输入是否正确

login页面

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
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>登录界面</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">
    <script type="text/javascript" src="${pageContext.request.contextPath }/js/jquery-2.1.4.js"></script>
     <style type="text/css">
        .error{
            color: red;
        }
    </style>
  </head>
  <script type="text/javascript">
      //页面加载
      $(function(){
          //派发失去焦点事件
          $("#username").blur(function(){
              //获取输入的用户名
              var $username = $(this).val();
              if($username.trim() == ""){
                  $("#userspanid").addClass("error");
                  $("#userspanid").html("用户名不能为空");
              } else {
                  var url="${pageContext.request.contextPath}/loginServlet";
                  var params={"username":$username};
                  $.post(url,params,function(data){
                      if( data == 0 ){
                          $("#userspanid").addClass("error");
                            $("#userspanid").html("您输入的用户名不存在，请核对用户名");
                      } else {
                          $("#userspanid").removeClass("error");
                            $("#userspanid").html("用户名正确");
                      }
                  });
              }
          });
      });

      //阻止表单提交
      //function checkForm() {
          //让提交之前先校验一下是否存在错误，如果存在，则不能提交

    //}
  </script>
  <body>
      <form method="post" id="sub"  action="${pageContext.request.contextPath }/loginInServlet">
    <table>
    <tr>
        <td>用户名：</td>
        <td><input type="text" name="username" id="username"></td>
        <td><span id="userspanid"></span></td>
    </tr>
    <tr>
        <td>密码：</td>
        <td><input type="password" name="password" id="username"></td>
        <td><span id="pwdspanid"></span></td>
    </tr>
    <tr>
        <td colspan="3">
        <input type="checkbox" name="autologin" id="autologin" value="autologinOk">自动登录</td>
    </tr>
    <tr>
        <td colspan="3"><input type="submit" value="login"></td>
    </tr>
    </table>
  </form>
  </body>
</html>
//success.jsp<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
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>成功页面</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>
    ${user.username }:欢迎回家
  </body>
</html>
//User类package com.tbamaw.domain;

public class User {

    private int uid;
    private String username;
    private String password;
    public int getUid() {
        return uid;
    }
    public void setUid(int uid) {
        this.uid = uid;
    }
    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 User() {}
    public User(String username, String password) {
        this.username = username;
        this.password = password;
    }

}

constant

package com.tbamaw.constant;

/**
 * 常量
 * @author bamaw
 *
 */
public interface Constant {
    //勾选自动登录
    String IS_AOTO_LOGIN = "autologinOk";
}

servlet

package com.tbamaw.web.servlet;

import java.io.IOException;
import java.sql.SQLException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.tbamaw.domain.User;
import com.tbamaw.service.UserService;

/**
 * 验证用户是否输入正确
 * @author bamaw
 *
 */
public class LoginServlet extends HttpServlet {

    private static final long serialVersionUID = -6706822935446915300L;

    public void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        doPost(request, response);
    }

    public void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        request.setCharacterEncoding("utf-8");
        String username = request.getParameter("username");
        User user = null;
        if( username != null ){
            try {
                user = new UserService().findByName(username);
                if (user != null) {
                    response.getWriter().print("1");
                } else{
                    response.getWriter().print("0");
                }
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
    }
}
package com.tbamaw.web.servlet;

import java.io.IOException;
import java.sql.SQLException;
import javax.servlet.ServletException;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.tbamaw.constant.Constant;
import com.tbamaw.domain.User;
import com.tbamaw.service.UserService;

/**
 * 用户登录
 * @author bamaw
 *
 */
public class LoginInServlet extends HttpServlet {

    private static final long serialVersionUID = -1501341575375720050L;

    public void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        doPost(request, response);
    }
    public void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        request.setCharacterEncoding("utf-8");
        //获取用户输入的用户名和密码
        String username = request.getParameter("username");
        String password = request.getParameter("password");
        User user = null;
        //调用Service
        try {
            user = new UserService().login(username,password);
            if (user == null) {
                request.setAttribute("msg", "用户名和密码不匹配！");
                request.getRequestDispatcher("/user/login.jsp").forward(request, response);
                return;
            } else {
                //若不为空，跳转到success.jsp页面上
                request.getSession().setAttribute("user", user);
                //判断是否勾选了自动登录，若是，需要将用户名和密码放入到cookie中，写回浏览器
                if (Constant.IS_AOTO_LOGIN.equals(request.getParameter("autologin"))) {
                    //创建Cookie //第一项给cookie设置名字autologin
                    Cookie c = new Cookie("autologin",username+"-"+password);
                    c.setMaxAge(3600);
                    c.setPath(request.getContextPath()+"/");
                    response.addCookie(c);
                }
                //页面重定向
                response.sendRedirect(request.getContextPath()+"/success.jsp");
            }
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }

}

sevice

package com.tbamaw.service;

import java.sql.SQLException;

import com.tbamaw.dao.UserDao;
import com.tbamaw.domain.User;

public class UserService {

    //验证用户名是否输入正确
    public User findByName(String username) throws SQLException {
        return new UserDao().findByName(username);
    }

    //用户登录
    public User login(String username, String password) throws SQLException {
        return new UserDao().login(username,password);
    }
}
DAO
package com.tbamaw.dao;

import java.sql.SQLException;

import org.apache.commons.dbutils.QueryRunner;
import org.apache.commons.dbutils.handlers.BeanHandler;

import com.tbamaw.domain.User;
import com.tbamaw.utils.DataSourceUtils;

public class UserDao {
    //验证用户名是否输入正确
    public User findByName(String username) throws SQLException {
        QueryRunner qr = new QueryRunner(DataSourceUtils.getDataSource());
        String sql = "SELECT username from t_user where username= ?";
        return qr.query(sql, new BeanHandler<User>(User.class),username);
    }
    //用户登录
    public User login(String username, String password) throws SQLException {
        QueryRunner qr = new QueryRunner(DataSourceUtils.getDataSource());
        String sql = "select username,password from t_user where username=? and password=?";
        return qr.query(sql, new BeanHandler<User>(User.class),username,password);
    }
}

filter

package com.tbamaw.filter;

import java.io.IOException;
import java.sql.SQLException;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.tbamaw.domain.User;
import com.tbamaw.service.UserService;
import com.tbamaw.utils.CookieUtils;

public class AutoLoginFilter implements Filter {

    public void destroy() {
    }

    public void init(FilterConfig filterConfig) throws ServletException {
    }

    public void doFilter(ServletRequest req, ServletResponse resp,
            FilterChain chain) throws IOException, ServletException {
        // 强转
        HttpServletRequest request = (HttpServletRequest) req;
        HttpServletResponse response = (HttpServletResponse) resp;
        // 完成自动登录，在此之前先判断session中有没有登录用户，若没有，则自动登录
        User user = (User) request.getSession().getAttribute("user");
        if (user == null) {// 先判断用户是否为空,为空时,则自动登录
            // 判断访问的资源是否和登录或者注册等有关,若没有关系,自动登录
            String path = request.getRequestURI();// "/auto_login/xxxx"
            if (!path.contains("/login")) {
                // 获取指定cookie
                Cookie cookie = CookieUtils.getCookieByName("autologin",request.getCookies());
                // 判断cookie是否为空，若不为空，取值（username,password）,调用service,完成登录,
                // 判断user是否为空,不为空，放入session中
                if (cookie != null) {
                    String username = cookie.getValue().split("-")[0];
                    String password = cookie.getValue().split("-")[1];
                    // 调用service完成登录
                    try {
                        user = new UserService().login(username, password);
                    } catch (SQLException e) {
                        e.printStackTrace();
                    }
                    if (user != null) {
                        request.getSession().setAttribute("user", user);
                    }
                }
            }
        }
        // 放行
        chain.doFilter(request, response);
    }
}

utils

package com.tbamaw.utils;
import javax.servlet.http.Cookie;
public class CookieUtils {
    /**
     * 通过名称在cookie数组获取指定的cookie
     * @param name cookie名称
     * @param cookies  cookie数组
     * @return
     */
    public static Cookie getCookieByName(String name, Cookie[] cookies) {
        if(cookies!=null){
            for (Cookie c : cookies) {
                //通过名称获取
                if(name.equals(c.getName())){
                    //返回
                    return c;
                }
            }
        }
        return null;
    }
}


				


				
时间： 2024-08-13 15:56:12 

		


		


	

	
	

		


		
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