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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