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jsp 通过cookie 记住用户名

记住用户名记住密码remember mecookie会话 
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java web中登录时如何记住用户名呢?

具体思路:

登录界面如下:

 在后台(Servlet 或struts 的action)中进行判断,若登录成功则通过HttpServletResponse 添加一个cookie.

在登录的jsp页面中,通过request 获取cookie数组,然后遍历,若找到相应的cookie,则把cookie的value设置到表单的对应文本框中.

 

具体代码如下:

登录的JSP页面中(核心代码):

<body>
<%
Cookie[] cookies = request.getCookies();
String username33="";
if (cookies != null) {
	for (Cookie c : cookies) {
		/*if ("password22".equals(c.getName())) {
			user.setPassword(URLDecoder.decode(c.getValue(), "utf-8"));
			continue;
		}*/
		if ("userEmail".equals(c.getName())) {
			username33=URLDecoder.decode(c.getValue(), "utf-8");
			break;
		}
	}
}
%>
<script type="text/javascript">
window.onload=function(){
var username1='<%=username33 %>';
//alert("username1:"+username1);
if(username1){
	if(username1!='' && username1!=null &&username1!=undefined){
		document.getElementsByName("user.username")[0].value=username1;
	}
}
}
</script>
...
</body>

 后台的action:

if (isLogin) {
			
			//保存用户名(目前是邮箱)
			
				String emaiCookieName = "userEmail";
		        HttpServletRequest request=ServletActionContext.getRequest();
		        Cookie[] cookies = request.getCookies();
				boolean flag = false;
		        Cookie emailCook = null;
		        if (cookies != null)
		        {
		        	System.out.println("cookie 不为空");
		            for (Cookie c : cookies)
		            {

		                if (emaiCookieName.equals(c.getName()))
		                {
		                	System.out.println("找到了 "+emaiCookieName);
		                	System.out.println("cookie的值为 "+c.getValue());
		                    try {
								c.setValue(URLEncoder.encode(this.user.getUsername(), "utf-8"));
							} catch (UnsupportedEncodingException e) {
								e.printStackTrace();
							}
		                    emailCook = c;
		                    flag = true;
		                    break;
		                }
		            }
		            
		        }
		        if (!flag)
		        {
		        	System.out.println("没有找到 "+emaiCookieName);


		            try {
						emailCook = new Cookie(emaiCookieName, URLEncoder.encode(
								this.user.getUsername(), "utf-8"));
					} catch (UnsupportedEncodingException e) {
						e.printStackTrace();
					}
		        }

		            if (null != emailCook)
		            {
		            	 HttpServletResponse response=ServletActionContext.getResponse();
		            	if(!ValueWidget.isNullOrEmpty(issave) && issave.equalsIgnoreCase("save")){
			                emailCook.setMaxAge(10000000);
			               
			                response.addCookie(emailCook);
			                System.out.println("保存cookie");
			             }else{
			                	System.out.println("让 cookie 失效");
			                	emailCook.setMaxAge(0);
			                	response.addCookie(emailCook);
			             }
		            }

		           
			
			return Action.SUCCESS;
		}

 源代码见附件

说明:

该项目使用maven 构建;

IDE:eclipse

数据库:mysql

登录地址:http://localhost:8080/shop_goods/user/loginInput.action

 

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| javascript 编程要注意的问题
评论
4 楼 hw1287789687 2014-10-07  
应用场景:
/***
	 * 
	 * @param model
	 * @param user
	 * @param request
	 * @param session
	 * @return  : 返回null,则登录成功,<br>否则,登录失败
	 */
	public String loginCommon(Model model,User user,HttpServletRequest request,HttpServletResponse response
			, HttpSession session,String issave){
		if(ValueWidget.isNullOrEmpty(user)||ValueWidget.isNullOrEmpty(user.getUsername())){
//			model.addAttribute("info", "请输入用户名.");
//			System.out.println("user is null");
//			return "user/login";
			return "请输入用户名.";
		}
		if(user.getUsername().trim().length()<3 || user.getUsername().trim().length()>16){
//			model.addAttribute("info", "请输入3-16位用户名字符.");
//			return "user/login";
			return "请输入3-16位用户名字符.";
		}
		User user1 = userDao.getByUsername(user.getUsername());
		if(user1==null){
//			model.addAttribute("info", "您输入的用户名不存在.");
//			return "user/login";
			return "您输入的用户名不存在.";
		}
		if(!user.getPassword().equals(user1.getPassword())){
//			model.addAttribute("info", "您输入的密码有误.");
//			return "user/login";
			return "您输入的密码有误.";
		}
		session.setAttribute(Constant2.SESSION_KEY_LOGINED_USER, user1);//登录成功的标识有两个:"user",Constant2.SESSION_KEY_LOGINED_FLAG
		session.setAttribute(Constant2.SESSION_KEY_LOGINED_FLAG, Constant2.FLAG_LOGIN_SUCCESS);//登录成功的标识有两个:"user",Constant2.SESSION_KEY_LOGINED_FLAG
		model.addAttribute("user", user1);
		boolean isSave = !ValueWidget.isNullOrEmpty(issave)
				&& issave.equalsIgnoreCase("save");
		System.out.println("isSave:"+isSave);
		WebServletUtil.rememberMe(request,response,"userEmail", user.getUsername(), isSave);
		return null;
	}
3 楼 hw1287789687 2014-10-07  
hw1287789687 写道
封装的方法
/***
	 * 是否保存cookie
	 * @param request
	 * @param response
	 * @param emaiCookieName
	 * @param cookieValue
	 * @param isSave : 是否保存用户名(记住用户名)
	 * @return
	 */
	public static Cookie rememberMe(HttpServletRequest request,HttpServletResponse response,String emaiCookieName, String cookieValue,
			boolean isSave) {
//		HttpServletRequest request = ServletActionContext.getRequest();
		Cookie[] cookies = request.getCookies();
		boolean flag = false;
		// Cookie passwordCook = null;
		Cookie emailCook = null;
		if (cookies != null) {
			System.out.println("cookie 不为空");
			for (Cookie c : cookies) {
				// if (passwordCookieName.equals(c.getName()))
				// {
				// c.setValue(URLEncoder.encode(password, "utf-8"));
				// passwordCook = c;
				// flag = true;
				// continue;
				// }
				if (emaiCookieName.equals(c.getName()) &&(! ValueWidget.isNullOrEmpty(cookieValue))) {
					System.out.println("找到了 " + emaiCookieName);
					System.out.println("cookie的值为 " + c.getValue());
					try {
						c.setValue(URLEncoder.encode(cookieValue, "utf-8"));
					} catch (UnsupportedEncodingException e) {
						e.printStackTrace();
					}
					emailCook = c;
					flag = true;
					break;
				}
			}

		}

//		HttpServletResponse response = ServletActionContext.getResponse();
		if (isSave) {
			if (!flag) {
				System.out.println("没有找到 " + emaiCookieName);
				// passwordCook = new Cookie(passwordCookieName, URLEncoder
				// .encode(password, "utf-8"));
				try {
					emailCook = new Cookie(emaiCookieName, URLEncoder.encode(
							cookieValue, "utf-8"));
				} catch (UnsupportedEncodingException e) {
					e.printStackTrace();
				}
			}
			emailCook.setMaxAge(10000000);
			response.addCookie(emailCook);
			flag=true;
			System.out.println("保存cookie:"+emailCook.getValue());
		} else {
			if (flag) {
				System.out.println("让 cookie 失效");
				emailCook.setMaxAge(0);
				response.addCookie(emailCook);
			}
		}
	

		return emailCook;
	}


使用场景:
if(! StringUtil.isNullOrEmpty(resultCode)&&resultCode.equals("0001")){
					
					System.out.println("issave:"+issave);
					boolean isSave = !StringUtil.isNullOrEmpty(issave)
							&& issave.equalsIgnoreCase("save");
					System.out.println("isSave:"+isSave);
					Json2Util.rememberMe(emaiCookieName, email, isSave);
					success=true;
				}
1 楼 hw1287789687 2014-10-07  
封装的方法
/***
	 * 是否保存cookie
	 * @param request
	 * @param response
	 * @param emaiCookieName
	 * @param cookieValue
	 * @param isSave : 是否保存用户名(记住用户名)
	 * @return
	 */
	public static Cookie rememberMe(HttpServletRequest request,HttpServletResponse response,String emaiCookieName, String cookieValue,
			boolean isSave) {
//		HttpServletRequest request = ServletActionContext.getRequest();
		Cookie[] cookies = request.getCookies();
		boolean flag = false;
		// Cookie passwordCook = null;
		Cookie emailCook = null;
		if (cookies != null) {
			System.out.println("cookie 不为空");
			for (Cookie c : cookies) {
				// if (passwordCookieName.equals(c.getName()))
				// {
				// c.setValue(URLEncoder.encode(password, "utf-8"));
				// passwordCook = c;
				// flag = true;
				// continue;
				// }
				if (emaiCookieName.equals(c.getName()) &&(! ValueWidget.isNullOrEmpty(cookieValue))) {
					System.out.println("找到了 " + emaiCookieName);
					System.out.println("cookie的值为 " + c.getValue());
					try {
						c.setValue(URLEncoder.encode(cookieValue, "utf-8"));
					} catch (UnsupportedEncodingException e) {
						e.printStackTrace();
					}
					emailCook = c;
					flag = true;
					break;
				}
			}

		}

//		HttpServletResponse response = ServletActionContext.getResponse();
		if (isSave) {
			if (!flag) {
				System.out.println("没有找到 " + emaiCookieName);
				// passwordCook = new Cookie(passwordCookieName, URLEncoder
				// .encode(password, "utf-8"));
				try {
					emailCook = new Cookie(emaiCookieName, URLEncoder.encode(
							cookieValue, "utf-8"));
				} catch (UnsupportedEncodingException e) {
					e.printStackTrace();
				}
			}
			emailCook.setMaxAge(10000000);
			response.addCookie(emailCook);
			flag=true;
			System.out.println("保存cookie:"+emailCook.getValue());
		} else {
			if (flag) {
				System.out.println("让 cookie 失效");
				emailCook.setMaxAge(0);
				response.addCookie(emailCook);
			}
		}
	

		return emailCook;
	}
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