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<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>Insert title here</title> </head> <body> <% session.invalidate(); %> <form action="yanzheng.jsp" method="post"> 用户名:<input type="text" name="yonghu"> 密码:<input type="password" name="mima"> <input type="submit" value="登录"> </form> </body> </html>
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>Insert title here</title> </head> <body> <% try{ String yonghu=new String(request.getParameter("yonghu").getBytes("ISO-8859-1"),"UTF-8"); String mima=request.getParameter("mima"); if(yonghu.equals("小小")&& mima.equals("123")) { session.setAttribute("yonghu", yonghu); response.sendRedirect("zhuye.jsp"); } else { out.print("用户名或密码错误，请重新输入"); response.setHeader("refresh", "3;URL=denglu.jsp"); } } catch(Exception e) { out.print("请从登录界面登录"); response.setHeader("refresh", "3;URL=denglu.jsp"); } %> </body> </html>
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=GB2312-80"> <title>Insert title here</title> </head> <body> <% Object obj=session.getAttribute("yonghu"); if(obj==null) { out.print("请先登录"); response.setHeader("refresh","3;URL=denglu.jsp"); } else { String a=new String(obj.toString()); out.print("欢迎 "+a+" 登录");
%>
<br> <a href="denglu.jsp"><input type="button" value="退出登录"></a>
<%
} %>
</body> </html>
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原文地址：http://www.cnblogs.com/wenwen123/p/5624719.html
