javaweb用户的自动登录模块的实现

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转载最新推荐文章于 2026-01-27 14:09:30 发布 1.1k 阅读 AI 写同款· GEO 优化 ›

javaWeb实战教程8-用户模块的编码实现 javaWeb实战教程5.用户模块的开发5.1 需求分析用户可以注册、登录；登录完成的用户记录登录状态；用户下次访问自动使用cookie登录；5.2 编码javaBean在fy.test.model内新建User.java，按照数据库的字段编写javaBean：public class User { private int id; private String username; 阅读详情

javaBean的代码
package bean;
import java.io.Serializable;
public class Admin implements Serializable{
/**
*
*/
private static final long serialVersionUID = 1L;
private Integer id;
private String name;
private String pass;
public Admin() {
super();
// TODO Auto-generated constructor stub
}
public Admin(Integer id, String name, String pass) {
super();
this.id = id;
this.name = name;
this.pass = pass;
}
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getPass() {
return pass;
}
public void setPass(String pass) {
this.pass = pass;
}
@Override
public String toString() {
return "AdminBean [id=" + id + ", name=" + name + ", pass=" + pass
+ "]";
}
}

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dao的基础接口类
package dao;
import java.util.List;
public interface BaseDao<T, PK> {
/**
* 插入数据
*/
boolean insert(T entity);
/**
* 根据实体删除数据
*/
boolean delete(T entity);
/**
* 根据ID删除数据
*/
boolean deleteById(PK id);
/**
* 修改数据
*/
boolean update(T entity);
/**
* 查询所有数据
*/
List<T> findAll();
/**
* 根据ID查询数据
*/
T findById(PK id);
/**
* 根据当前页查询数据
*/
List<T> findNowPageInfo(int nowpage, int pagesize,String sortName,String sortOrder);
/**
* 返回总页数
*/
Integer getCountPage(int pagesize);
/**
* 批量删除
*/
boolean deletes(Object ids[]);
}

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对admin操作的接口类,继承自basedao
package dao;
import bean.Admin;
public interface AdminDao extends BaseDao<Admin, Integer> {
Admin checkLogin(String name,String pass);
Admin checkLogin(String name);
}

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dao操作实体的实现类
package daoImpl;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.List;
import util.JdbcUtil;
import bean.Admin;
import dao.AdminDao;
public class AdminDaoImpl implements AdminDao {
private Connection conn;
private PreparedStatement pstmt;
private ResultSet rs;
@Override
public boolean insert(Admin entity) {
return JdbcUtil.upDate("insert into admin (name,pass) values (?,?)",
new Object[] { entity.getName(), entity.getPass() });
}
@Override
public boolean delete(Admin entity) {
// TODO Auto-generated method stub
return deleteById(entity.getId());
}
@Override
public boolean deleteById(Integer id) {
// TODO Auto-generated method stub
return JdbcUtil.upDate("delete from admin where id=?",
new Object[] { id });
}
@Override
public boolean update(Admin entity) {
// TODO Auto-generated method stub
return JdbcUtil.upDate(
"update admin set name=?,pass=? where id=?",
new Object[] { entity.getName(), entity.getPass(),
entity.getId() });
}
@Override
public List<Admin> findAll() {
// TODO Auto-generated method stub
return null;
}
@Override
public Admin findById(Integer id) {
// TODO Auto-generated method stub
return null;
}
@Override
public List<Admin> findNowPageInfo(int nowpage, int pagesize,
String sortName, String sortOrder) {
// TODO Auto-generated method stub
return null;
}
@Override
public Integer getCountPage(int pagesize) {
// TODO Auto-generated method stub
return null;
}
@Override
public boolean deletes(Object[] ids) {
// TODO Auto-generated method stub
return false;
}
@Override
public Admin checkLogin(String name, String pass) {
// TODO Auto-generated method stub
Admin entity = null;
String sql = "select * from admin where name=? and pass=?";
conn = JdbcUtil.getConn();
try {
pstmt = conn.prepareStatement(sql);
int index = 1;
pstmt.setString(index++, name);
pstmt.setString(index++, pass);
rs = pstmt.executeQuery();
if (rs.next()) {
entity = new Admin();
entity.setId(rs.getInt("id"));
entity.setName(rs.getString("name"));
entity.setPass(rs.getString("pass"));
}
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} finally {
JdbcUtil.release(rs, pstmt);
}
return entity;
}
@Override
public Admin checkLogin(String name) {
Admin entity = null;
String sql = "select * from admin where name=?";
conn = JdbcUtil.getConn();
try {
pstmt = conn.prepareStatement(sql);
int index = 1;
pstmt.setString(index++, name);
rs = pstmt.executeQuery();
if (rs.next()) {
entity = new Admin();
entity.setId(rs.getInt("id"));
entity.setName(rs.getString("name"));
entity.setPass(rs.getString("pass"));
}
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} finally {
JdbcUtil.release(rs, pstmt);
}
return entity;
}
}

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服务器接口类,用来将操作数据库的方法与记录历史的方法或其他的方法分离开,作用是增强代码的可读性以及条理性,
package service;
import java.util.List;
public interface BaseService<T, PK> {
/**
* 插入数据
*/
boolean insert(T entity);
/**
* 根据实体删除数据
*/
boolean delete(T entity);
/**
* 根据ID删除数据
*/
boolean deleteById(PK id);
/**
* 修改数据
*/
boolean update(T entity);
/**
* 查询所有数据
*/
List<T> findAll();
/**
* 根据ID查询数据
*/
T findById(PK id);
/**
* 根据当前页查询数据
*/
List<T> findNowPageInfo(int nowpage, int pagesize,String sortName,String sortOrder);
/**
* 返回总页数
*/
Integer getCountPage(int pagesize);
/**
* 批量删除
*/
boolean deletes(Object ids[]);
}
package service;
import bean.Admin;
public interface AdminService extends BaseService<Admin, Integer> {
Admin checkLogin(String name,String pass);
Admin checkLogin(String name);
}

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实现服务器接口方法的实现类
package serviceImpl;
import java.util.List;
import dao.AdminDao;
import daoImpl.AdminDaoImpl;
import bean.Admin;
import service.AdminService;
public class AdminServiceImpl implements AdminService {
AdminDao adminDao = new AdminDaoImpl();
@Override
public boolean insert(Admin entity) {
return adminDao.insert(entity);
}
@Override
public boolean delete(Admin entity) {
return false;
}
@Override
public boolean deleteById(Integer id) {
return false;
}
@Override
public boolean update(Admin entity) {
return false;
}
@Override
public List<Admin> findAll() {
return null;
}
@Override
public Admin findById(Integer id) {
return null;
}
@Override
public List<Admin> findNowPageInfo(int nowpage, int pagesize,
String sortName, String sortOrder) {
return null;
}
@Override
public Integer getCountPage(int pagesize) {
return null;
}
@Override
public boolean deletes(Object[] ids) {
return false;
}
@Override
public Admin checkLogin(String name, String pass) {
Admin entity = adminDao.checkLogin(name, pass);
return entity;
}
@Override
public Admin checkLogin(String name) {
Admin entity = adminDao.checkLogin(name);
return entity;
}
}

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用来将页面传入的信息进行分析处理的服务器类,
package servlet;
import java.io.IOException;
import java.net.URLEncoder;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import javax.jms.Message;
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.sun.mail.util.BASE64DecoderStream;
import com.sun.mail.util.BASE64EncoderStream;
import service.AdminService;
import serviceImpl.AdminServiceImpl;
import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;
import bean.Admin;
public class AdminServlet extends HttpServlet {
private AdminService adminService = new AdminServiceImpl();
// 规定时间常量,为一天
private final int EXPIRES = 60 * 60 * 24;
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
// request.setCharacterEncoding("UTF-8");
String oper = request.getParameter("oper");
if ("adminLogin".equals(oper)) {
adminLogin(request, response);
}
if ("login".equals(oper)) {
request.getRequestDispatcher("./login.jsp").forward(request,
response);
}
}
private void adminLogin(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
//获取表单提交的数据
String name = request.getParameter("name");
String pass = request.getParameter("pass");
String mark = request.getParameter("mark");
String day = request.getParameter("day");
// System.out.println(name + "====" + pass + "====" + mark
// + "============" + day);
//根据获取的数据向数据库发送数据请求,
Admin entity = adminService.checkLogin(name, pass);
//判断查询结果
if (entity != null) {
//判断用户是否进行记录密码和自动登陆的操作
if ("mark".equals(mark)) {
// 获取当前的时间并加上要保存的时间长度
long time = System.currentTimeMillis()
+ (EXPIRES * Integer.valueOf(day)*1000);
// 声明cookie
Cookie autoCookie = null;
// 获取所有的cookie的数组
Cookie cookies[] = request.getCookies();
// 遍历判断
for (Cookie cookie : cookies) {
// 判断是否已经存在cookie记录
if ("autoLogin".equals(cookie.getName())) {
// 存在即直接赋值
autoCookie = cookie;
// 并改变内容
String newValue = name
+ ":"
+ time
+ ":"
+ md5Value(pass + ":" + name + ":" + time
+ ":donghongyujava");
autoCookie.setValue(newValue);
} else {
String cookieValue = name
+ ":"
+ time
+ ":"
+ md5Value(pass + ":" + name + ":" + time
+ ":donghongyujava");
/*
* Control character in cookie value or attribute.
* 当存入的数据是中文时,cookie会出现乱码现象需要进行编码的转换
*/
autoCookie = new Cookie("autoLogin", URLEncoder.encode(
cookieValue, "UTF-8"));
}
}
// 设置cookie的最长的存活时间
autoCookie.setMaxAge(EXPIRES * Integer.valueOf(day));
response.addCookie(autoCookie);
}
// 将admin存入到session
request.getSession().setAttribute("admin", entity);
// 设置成功后就登陆操作
request.getRequestDispatcher("./sc.jsp").forward(request, response);
} else {
request.setAttribute("msg", "用户名或密码错误请重试");
request.getRequestDispatcher("./login.jsp").forward(request,
response);
}
}
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
this.doGet(request, response);
}
//加密的操作方法
public String md5Value(String value) {
try {
// 获取md5加密的对象
MessageDigest digest = MessageDigest.getInstance("md5");
// 将传入的数据装换为byte字节,在用digest进行转换(加密)成新的字节数组,
byte result[] = digest.digest(value.getBytes());
//需要的jdk版本myeclipse2013中自带的com.sun.java.jdk.win32.x86_64_1.6.0.u43
//jdk1.7.0_25没有相关的包
BASE64Encoder encoder = new BASE64Encoder();
// 返回加密后的数据
return encoder.encode(result);
} catch (NoSuchAlgorithmException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return "";
};
}

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过滤器类,用来设置请求的编码
package filter;
import java.io.IOException;
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.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class EncodingFilter implements Filter {
private FilterConfig filterConfig;
@Override
public void destroy() {
// TODO Auto-generated method stub
}
@Override
public void doFilter(ServletRequest req, ServletResponse res,
FilterChain chain) throws IOException, ServletException {
HttpServletRequest request = (HttpServletRequest) req;
HttpServletResponse response = (HttpServletResponse) res;
// 编码的设置
request.setCharacterEncoding(filterConfig.getInitParameter("encoding"));
chain.doFilter(request, response);
}
@Override
public void init(FilterConfig filterConfig) throws ServletException {
// TODO Auto-generated method stub
this.filterConfig=filterConfig;
}
}

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自动登录的过滤类,用来控制用户的自动的登录操作的相关
package filter;
import java.io.IOException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
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 bean.Admin;
import service.AdminService;
import serviceImpl.AdminServiceImpl;
import sun.misc.BASE64Encoder;
public class AutoLoginFilter implements Filter {
@Override
public void destroy() {
// TODO Auto-generated method stub
}
@Override
public void doFilter(ServletRequest req, ServletResponse res,
FilterChain chain) throws IOException, ServletException {
// 强制造型为子类型
HttpServletRequest request = (HttpServletRequest) req;
HttpServletResponse response = (HttpServletResponse) res;
// 1.首先判断session
Object object = request.getSession().getAttribute("admin");
if (object != null) {
request.getRequestDispatcher("./sc.jsp").forward(request, response);
return;
}
// 2.判断cookie中是否存在用户的记录
Cookie autoCookie = null;
// 获取所有的cookie进行遍历判断
Cookie cookies[] = request.getCookies();
if (cookies != null) {
for (Cookie cookie : cookies) {
// 判断是否已经存贮用户记录
if ("autoLogin".equals(cookie.getName())) {
autoCookie = cookie;
}
}
// 判断是否存在用户自动登录记录
if (autoCookie == null) {
chain.doFilter(request, response);
return;
}
// 3.判断cookie的值
// 获取cookie值
String value = autoCookie.getValue();
// 拆分
String temps[] = value.split(":");
// 判断长度是否是自定义的长度
if (temps.length != 3) {
chain.doFilter(request, response);
return;
}
// 获取拆分后的数据
String name = temps[0];
String time = temps[1];
String service_md5Value = temps[2];
// 4.根据时间判断是否失效
if (Long.valueOf(time) <= System.currentTimeMillis()) {
chain.doFilter(request, response);
return;
}
// 5.根据用户名查询数据
AdminService adminService = new AdminServiceImpl();
// 向数据库发送数据请求
Admin entity = adminService.checkLogin(name);
if (entity == null) {
chain.doFilter(request, response);
return;
}
// 6.拼接字符串在进行二次判断,
String md5Temp = entity.getPass() + ":" + entity.getName() + ":"
+ time + "donghongyujava";
if (!(md5Value(md5Temp).equals(service_md5Value))) {
chain.doFilter(request, response);
return;
}
// 7.如果以上的判断都通过,那么就发送成功的转跳连接
request.getSession().setAttribute("admin", entity);
request.getRequestDispatcher("./sc.jsp").forward(request, response);
} else {
chain.doFilter(request, response);
return;
}
}
@Override
public void init(FilterConfig arg0) throws ServletException {
// TODO Auto-generated method stub
}
// 加密的操作函数
public String md5Value(String value) {
try {
// 获取md5加密的对象
MessageDigest digest = MessageDigest.getInstance("md5");
// 将传入的数据装换为byte字节,在用digest进行转换(加密)成新的字节数组,
byte result[] = digest.digest(value.getBytes());
BASE64Encoder encoder = new BASE64Encoder();
// 返回加密后的数据
return encoder.encode(result);
} catch (NoSuchAlgorithmException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return "";
};
}

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web的配置,主要配置的是servlet和filter的配置
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
id="WebApp_ID" version="3.0">
<display-name>jqueryeasyui</display-name>
<servlet>
<servlet-name>AdminServlet</servlet-name>
<servlet-class>servlet.AdminServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>AdminServlet</servlet-name>
<url-pattern>/AdminOPer.do</url-pattern>
</servlet-mapping>
<filter>
<filter-name>AutoLoginFilter</filter-name>
<filter-class>filter.AutoLoginFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>AutoLoginFilter</filter-name>
<url-pattern>/AdminOPer.do</url-pattern>
</filter-mapping>
<filter>
<filter-name>EncodingFilter</filter-name>
<filter-class>filter.EncodingFilter</filter-class>
<init-param>
<param-name>encoding</param-name>
<param-value>UTF-8</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>EncodingFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<welcome-file-list>
<welcome-file>index.html</welcome-file>
<welcome-file>index.htm</welcome-file>
<welcome-file>index.jsp</welcome-file>
<welcome-file>default.html</welcome-file>
<welcome-file>default.htm</welcome-file>
<welcome-file>default.jsp</welcome-file>
</welcome-file-list>
</web-app>

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用来跳转的jsp代码
<%@ 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>My JSP 'index.jsp' starting page</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>
<a href="${pageContext.request.contextPath}/AdminOPer.do?oper=login">登录操作</a>
</body>
</html>