jsp登陆校验演示 servlet、login、success
jsp的登录校验Demo
part_1:login.jsp:登录页面:
<%@pagelanguage="java"import="java.util.*"pageEncoding="UTF-8"%>
<%
Stringpath=request.getContextPath();
StringbasePath=request.getScheme()+"://"
+request.getServerName()+":"+request.getServerPort()
+path+"/";
%>
<!DOCTYPEHTMLPUBLIC"-//W3C//DTDHTML4.01Transitional//EN">
<html>
<head>
<basehref="<%=basePath%>">
<title>MyJSP'Login.jsp'startingpage</title>
<metahttp-equiv="pragma"content="no-cache">
<metahttp-equiv="cache-control"content="no-cache">
<metahttp-equiv="expires"content="0">
<metahttp-equiv="keywords"content="keyword1,keyword2,keyword3">
<metahttp-equiv="description"content="Thisismypage">
<!--
<linkrel="stylesheet"type="text/css"href="styles.css">
-->
</head>
<%
StringfdbkMsg=(String)request.getAttribute("fdbkMsg");
if(null==fdbkMsg){
fdbkMsg="";
}
%>
<%
BooleanlogedIn=(Boolean)session.getAttribute("logedIn");
if(null==logedIn){
logedIn=false;
}elseif(logedIn){
//如果在本次会话已经登陆，直接重定向到success-page-1
response
.sendRedirect("/ServletDemoProject/LOGIN-DEMO/success-page-1.jsp");
}
%>
<%
Stringusername="";
Cookie[]cookies=request.getCookies();
if((null!=cookies)&&(cookies.length>0)){
for(Cookiec:cookies){
if("admin".equals(c.getValue())){
username="admin";
break;
}
}
}//endif-condition
%>
<body>
<br>
<divalign="center">
请登录:
<br>
<formaction="/ServletDemoProject/servlet/LoginVerificationServlet"
method="post">
用户名：
<inputtype="text"name="username"value="<%=username%>"/>
<br>
密码：
<inputtype="password"name="password"value=""/>
<br>
<fontcolor='red'><%=fdbkMsg%></font>
<br>
<inputtype="submit"value="提交"/>
<br>
</form>
</div>
</body>
</html>
part_2:LoginVerificationServlet.java:校验登录信息，此处没有连接数据库，默认只有username：admin，password：888888才算登录成功；登陆失败时：重新转发到Login.jsp并提示用户登陆失败，重新登陆；
packagecn.mike.servlet.test_1209_Login;
importjava.io.IOException;
importjavax.servlet.ServletException;
importjavax.servlet.http.Cookie;
importjavax.servlet.http.HttpServlet;
importjavax.servlet.http.HttpServletRequest;
importjavax.servlet.http.HttpServletResponse;
publicclassLoginVerificationServletextendsHttpServlet{
privatestaticfinallongserialVersionUID=-6886327892796230543L;
publicvoiddoGet(HttpServletRequestrequest,HttpServletResponseresponse)
throwsServletException,IOException{
Stringusername=request.getParameter("username");
Stringpassword=request.getParameter("password");
if(("admin".equals(username))&&("888888".equals(password))){//登录成功
//保存cookie到客户端
CookieuserCookie=newCookie("username",username);
userCookie.setMaxAge(60*2);//expiry:2minutes
response.addCookie(userCookie);
//重定向到一个新的页面，并提示XXX用户登录成功（使用session存取用户名）;
request.getSession().setAttribute("username",username);
request.getSession().setAttribute("logedIn",true);
response
.sendRedirect("/ServletDemoProject/LOGIN-DEMO/success-page-1.jsp");
}else{//登陆失败
//转发到登录界面，并提示错误信息：
request.setAttribute("fdbkMsg","用户名或密码错误！");
request.getRequestDispatcher("/LOGIN-DEMO/Login.jsp").forward(
request,response);
}
}
publicvoiddoPost(HttpServletRequestrequest,HttpServletResponseresponse)
throwsServletException,IOException{
//dosameasGET-method:
doGet(request,response);
}
}
part_3:success-page-1.jsp:校验登录成功后重定向到该页面，提示用户已经成功登陆；如果用户试图通过不正当途径，e.g:从地址栏访问，将会转发到登录界面，并作提示；
<%@pagelanguage="java"import="java.util.*"pageEncoding="UTF-8"%>
<%
Stringpath=request.getContextPath();
StringbasePath=request.getScheme()+"://"
+request.getServerName()+":"+request.getServerPort()
+path+"/";
%>
<!DOCTYPEHTMLPUBLIC"-//W3C//DTDHTML4.01Transitional//EN">
<html>
<head>
<basehref="<%=basePath%>">
<title>MyJSP'success-page-1.jsp'startingpage</title>
<metahttp-equiv="pragma"content="no-cache">
<metahttp-equiv="cache-control"content="no-cache">
<metahttp-equiv="expires"content="0">
<metahttp-equiv="keywords"content="keyword1,keyword2,keyword3">
<metahttp-equiv="description"content="Thisismypage">
<!--
<linkrel="stylesheet"type="text/css"href="styles.css">
-->
</head>
<%
Stringusername=(String)session.getAttribute("username");
if(null==username){
//如果username为空值，说明不是通过正常渠道来的，转发到Login页面；
request.setAttribute("fdbkMsg","别想走后门进来，赶紧登录！");
request.getRequestDispatcher("/LOGIN-DEMO/Login.jsp").forward(
request,response);
}
%>
<body>
<br>
<%=username%>已经成功登陆。
<br>
<font>您可以选择浏览：</font>
<br>
<ahref="/ServletDemoProject/LOGIN-DEMO/success-page-2.jsp">点这儿有精彩.</a>
<br>
<ahref="/ServletDemoProject/LOGIN-DEMO/success-page-2.jsp">点这儿更精彩.</a>
<br/>
<ahref="/ServletDemoProject/LOGIN-DEMO/success-page-2.jsp">你敢点这儿吗.</a>
<br/>
</body>
</html>
part_4:success-page-2.jsp:登陆成功页面2，如果已经登陆成功将用户名保存到session，在访问该页面时将会校验一下，防止从地址栏暴力访问；
<%@pagelanguage="java"import="java.util.Date"pageEncoding="UTF-8"%>
<%@pagelanguage="java"import="java.text.SimpleDateFormat"%>
<%
Stringpath=request.getContextPath();
StringbasePath=request.getScheme()+"://"
+request.getServerName()+":"+request.getServerPort()
+path+"/";
%>
<!DOCTYPEHTMLPUBLIC"-//W3C//DTDHTML4.01Transitional//EN">
<html>
<head>
<basehref="<%=basePath%>">
<title>MyJSP'success-page-2.jsp'startingpage</title>
<metahttp-equiv="pragma"content="no-cache">
<metahttp-equiv="cache-control"content="no-cache">
<metahttp-equiv="expires"content="0">
<metahttp-equiv="keywords"content="keyword1,keyword2,keyword3">
<metahttp-equiv="description"content="Thisismypage">
<!--
<linkrel="stylesheet"type="text/css"href="styles.css">
-->
</head>
<%
Stringusername=(String)session.getAttribute("username");
if(null==username){
request.setAttribute("fdbkMsg","呵呵嗒，这里是你来的地方吗？快登陆！");
//转发到登录界面:
request.getRequestDispatcher("/LOGIN-DEMO/Login.jsp").forward(
request,response);
}
SimpleDateFormatsDateFormat=newSimpleDateFormat("a");
Datetoday=newDate();
Stringam_pm_str=sDateFormat.format(today);
Stringam_pm_str_in_chinese="";
if("am".equalsIgnoreCase(am_pm_str)){
am_pm_str_in_chinese="上午";
}else
am_pm_str_in_chinese="下午";
//setnull;
sDateFormat=null;
today=null;
am_pm_str=null;
%>
<body>
<br/>
<font><b><%=username%><%=am_pm_str_in_chinese%>好，能来到页面2真不简单.</b>
</font>
</body>
</html>
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持毛票票。