Cookie实现记住密码
Cookie 认识
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百科定义
类型为小型文本文件，是某些网站为了辨别用户身份，进行Session跟踪而存储在用户本地终端上的数据（通常经过加密），由用户客户端计算机暂时或永久保存的信息。
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组成
大小不超过 4KB
- Name/Value
- Expires
- Path
- Domain
- Secure
- HTTPOnly
Cookie 工具类
package com.hhhqqq.my.shop.commons.utils;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.UnsupportedEncodingException;
import java.net.URLDecoder;
import java.net.URLEncoder;
/**
* Cookie 工具类
* <p>Title: CookieUtils</p>
* <p>Description: </p>
*
* @author Lusifer
* @version 1.0.0
* @date 2017/12/10 22:00
*/
public final class CookieUtils {
/**
* 得到Cookie的值, 不编码
*
* @param request
* @param cookieName
* @return
*/
public static String getCookieValue(HttpServletRequest request, String cookieName) {
return getCookieValue(request, cookieName, false);
}
/**
* 得到Cookie的值
*
* @param request
* @param cookieName
* @return
*/
public static String getCookieValue(HttpServletRequest request, String cookieName, boolean isDecoder) {
Cookie[] cookieList = request.getCookies();
if (cookieList == null || cookieName == null) {
return null;
}
String retValue = null;
try {
for (int i = 0; i < cookieList.length; i++) {
if (cookieList[i].getName().equals(cookieName)) {
if (isDecoder) {
retValue = URLDecoder.decode(cookieList[i].getValue(), "UTF-8");
} else {
retValue = cookieList[i].getValue();
}
break;
}
}
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
return retValue;
}
/**
* 得到Cookie的值,
*
* @param request
* @param cookieName
* @return
*/
public static String getCookieValue(HttpServletRequest request, String cookieName, String encodeString) {
Cookie[] cookieList = request.getCookies();
if (cookieList == null || cookieName == null) {
return null;
}
String retValue = null;
try {
for (int i = 0; i < cookieList.length; i++) {
if (cookieList[i].getName().equals(cookieName)) {
retValue = URLDecoder.decode(cookieList[i].getValue(), encodeString);
break;
}
}
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
return retValue;
}
/**
* 设置Cookie的值 不设置生效时间默认浏览器关闭即失效,也不编码
*/
public static void setCookie(HttpServletRequest request, HttpServletResponse response, String cookieName,
String cookieValue) {
setCookie(request, response, cookieName, cookieValue, -1);
}
/**
* 设置Cookie的值 在指定时间内生效,但不编码
*/
public static void setCookie(HttpServletRequest request, HttpServletResponse response, String cookieName,
String cookieValue, int cookieMaxage) {
setCookie(request, response, cookieName, cookieValue, cookieMaxage, false);
}
/**
* 设置Cookie的值 不设置生效时间,但编码
*/
public static void setCookie(HttpServletRequest request, HttpServletResponse response, String cookieName,
String cookieValue, boolean isEncode) {
setCookie(request, response, cookieName, cookieValue, -1, isEncode);
}
/**
* 设置Cookie的值 在指定时间内生效, 编码参数
*/
public static void setCookie(HttpServletRequest request, HttpServletResponse response, String cookieName,
String cookieValue, int cookieMaxage, boolean isEncode) {
doSetCookie(request, response, cookieName, cookieValue, cookieMaxage, isEncode);
}
/**
* 设置Cookie的值 在指定时间内生效, 编码参数(指定编码)
*/
public static void setCookie(HttpServletRequest request, HttpServletResponse response, String cookieName,
String cookieValue, int cookieMaxage, String encodeString) {
doSetCookie(request, response, cookieName, cookieValue, cookieMaxage, encodeString);
}
/**
* 删除Cookie带cookie域名
*/
public static void deleteCookie(HttpServletRequest request, HttpServletResponse response,
String cookieName) {
doSetCookie(request, response, cookieName, "", -1, false);
}
/**
* 设置Cookie的值，并使其在指定时间内生效
*
* @param cookieMaxage cookie生效的最大秒数
*/
private static final void doSetCookie(HttpServletRequest request, HttpServletResponse response,
String cookieName, String cookieValue, int cookieMaxage, boolean isEncode) {
try {
if (cookieValue == null) {
cookieValue = "";
} else if (isEncode) {
cookieValue = URLEncoder.encode(cookieValue, "utf-8");
}
Cookie cookie = new Cookie(cookieName, cookieValue);
if (cookieMaxage > 0)
cookie.setMaxAge(cookieMaxage);
if (null != request) {// 设置域名的cookie
String domainName = getDomainName(request);
// System.out.println(domainName);
if (!"localhost".equals(domainName)) {
cookie.setDomain(domainName);
}
}
cookie.setPath("/");
response.addCookie(cookie);
} catch (Exception e) {
e.printStackTrace();
}
}
/**
* 设置Cookie的值，并使其在指定时间内生效
*
* @param cookieMaxage cookie生效的最大秒数
*/
private static final void doSetCookie(HttpServletRequest request, HttpServletResponse response,
String cookieName, String cookieValue, int cookieMaxage, String encodeString) {
try {
if (cookieValue == null) {
cookieValue = "";
} else {
cookieValue = URLEncoder.encode(cookieValue, encodeString);
}
Cookie cookie = new Cookie(cookieName, cookieValue);
if (cookieMaxage > 0)
cookie.setMaxAge(cookieMaxage);
if (null != request) {// 设置域名的cookie
String domainName = getDomainName(request);
// System.out.println(domainName);
if (!"localhost".equals(domainName)) {
cookie.setDomain(domainName);
}
}
cookie.setPath("/");
response.addCookie(cookie);
} catch (Exception e) {
e.printStackTrace();
}
}
/**
* 得到cookie的域名
*/
private static final String getDomainName(HttpServletRequest request) {
String domainName = null;
String serverName = request.getRequestURL().toString();
if (serverName == null || serverName.equals("")) {
domainName = "";
} else {
serverName = serverName.toLowerCase();
serverName = serverName.substring(7);
final int end = serverName.indexOf("/");
serverName = serverName.substring(0, end);
final String[] domains = serverName.split("\\.");
int len = domains.length;
if (len > 3) {
// www.xxx.com.cn
domainName = "." + domains[len - 3] + "." + domains[len - 2] + "." + domains[len - 1];
} else if (len <= 3 && len > 1) {
// xxx.com or xxx.cn
domainName = "." + domains[len - 2] + "." + domains[len - 1];
} else {
domainName = serverName;
}
}
if (domainName != null && domainName.indexOf(":") > 0) {
String[] ary = domainName.split("\\:");
domainName = ary[0];
}
return domainName;
}
}
实现
LoginController - 设置Cookie
判断是否选择记住密码，设置Cookie
- index.jsp
<div class="col-xs-8">
<div class="checkbox icheck">
<label>
<input name="isRemember" type="checkbox" ${isRemember == true ? "checked" : ""}> 记住密码
</label>
</div>
</div>
- doPost
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
String email = req.getParameter("email");
String password = req.getParameter("password");
boolean isRemember = req.getParameter("isRemember") == null ? false : true;
SpringContext springContext = new SpringContext();
UserService userService = (UserService) springContext.getBean("userService");
User user = userService.login(email, password);
// 不记住密码
if (!isRemember) {
CookieUtils.deleteCookie(req, resp, COOKIE_NAME_USER_INFO);
}
if (user != null) {
// 登录成功 且 记住密码
if (isRemember) {
CookieUtils.setCookie(req, resp, COOKIE_NAME_USER_INFO, String.format("%s:%s", email, password), 7*24*60*60);
}
resp.sendRedirect("/main.jsp");
}
else {
req.setAttribute("loginErrorMessage","用户名或密码错误");
req.getRequestDispatcher("/index.jsp").forward(req,resp);
}
}
LoginController - 获取Cookie
点击登录能够将信息保存到Cookie了，那每次打开的时候如何拿到？
-
在 doGet 里通过 getCookieValue 获得Cookie
-
默认打开index.jsp ，没有经过doGet方法，怎么转到login？
也就是每次打开的时候先打开index.jsp,地址是：http://localhost:8080 ， 怎么才能一打开就是：http://localhost:8080/login
- 新建一个login.jsp
- 将index.jsp的内容拷到login.jsp
- 在index.jsp使用
meta跳转<meta http-equiv="Refresh" content="0; url=/login" />
-
doGet里获取Cookie，并跳转到login.jsp
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
String userInfo = CookieUtils.getCookieValue(req, COOKIE_NAME_USER_INFO);
if (StringUtils.isNoneBlank(userInfo)) {
String[] userInfoArray = userInfo.split(":");
String email = userInfoArray[0];
String password = userInfoArray[1];
req.setAttribute("email", email);
req.setAttribute("password", password);
req.setAttribute("isRemember", true);
}
req.getRequestDispatcher("/login.jsp").forward(req, resp);
}
login.jsp 设置value
<div class="form-group has-feedback">
<input name="email" type="email" class="form-control" placeholder="邮箱" value="${email}">
<span class="glyphicon glyphicon-envelope form-control-feedback"></span>
</div>
<div class="form-group has-feedback">
<input name="password" type="password" class="form-control" placeholder="密码" value="${password}">
<span class="glyphicon glyphicon-lock form-control-feedback"></span>
</div>
<div class="row">
<div class="col-xs-8">
<div class="checkbox icheck">
<label>
<input name="isRemember" type="checkbox" ${isRemember == true ? "checked" : ""}> 记住密码
</label>
</div>
</div>
<!-- /.col -->
<div class="col-xs-4">
<button type="submit" class="btn btn-primary btn-block btn-flat">登录</button>
</div>
<!-- /.col -->
</div>