本文实例讲述了纯JSP实现的简单登录的方法。分享给大家供大家参考,具体如下:
文件共有四个web.xml、login.jsp、logout.jsp、welcome.jsp四个文件
测试环境:Tomcat 6.0.x
假设项目名称是LoginSample,我的目录结构是这样的
...\\webapps\\LoginSample\\WEB-INF\\web.xml
...\\webapps\\LoginSample\\login.jsp
...\\webapps\\LoginSample\\logout.jsp
...\\webapps\\LoginSample\\welcome.jsp
web.xml源码清单:
<web-app xmlns=\"http://java.sun.com/xml/ns/j2ee\"
xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\"
xsi:schemaLocation=\"http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd\"
version=\"2.4\">
<welcome-file-list>
<welcome-file>welcome.jsp</welcome-file>
</welcome-file-list>
</web-app>
login.jsp源码清单:
<%@ page contentType=\"text/html;charset=UTF-8\" %>
<html>
<head>
<title>JSP简单登录实例</title>
</head>
<body>
<h2>请登录</h2>
<form method=\"POST\" >
Login Name: <input type=\"text\" name=\"Name\"><br>
Login Password: <input type=\"text\" name=\"Password\" ><br>
<input type=\"submit\" value=\"Send\"><br>
<form>
<%
if (request.getParameter(\"Name\") != null
&& request.getParameter(\"Password\") != null) {
String Name = request.getParameter(\"Name\");
String Password = request.getParameter(\"Password\");
if (Name.equals(\"a\") && Password.equals(\"a\")) {
session.setAttribute(\"Login\", \"OK\");
session.setAttribute(\"myCount\", new Integer(1));
response.sendRedirect(\"welcome.jsp\");
}
else {
%>
登录失败:用户名或密码不正确~
<%
}
}
%>
</body>
</html>
logout.jsp源码清单:
<%@ page contentType=\"text/html;charset=UTF-8\" %> <html> <% session.setAttribute(\"Login\", \"\"); %> <body> <h2>你已经退出登录</h2> </body> </html>
welcome.jsp源码清单:
<%@ page contentType=\"text/html\" pageEncoding=\"UTF-8\" import=\"java.util.*\"%>
<html>
<body>
<h2>欢迎页面(测试session)</h2>
<%
String Login = (String)session.getAttribute(\"Login\");
int nCount=0;
if (Login != null && Login.equals(\"OK\")) {
Integer myCount = (Integer)session.getAttribute(\"myCount\");
if(myCount!=null)
{
nCount = myCount.intValue();
nCount = nCount + 1;
session.setAttribute(\"myCount\",new Integer(nCount));
}
%>
登录成功,myCount=<%=nCount%></br>
<input type=button value=\"退出\" onclick=\"javascript:location.href=\'logout.jsp\'\">
<%
}
else {
%>
<jsp:forward page=\"login.jsp\"/>
<%
}
%>
</body>
</html>
希望本文所述对大家JSP程序设计有所帮助。
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