jsp第八周作业
1.登陆
输入用户名密码，判断用户名和密码相同，登陆成功，session中保存用户的用户名，进入主页main.jsp，主页有一个退出按钮，点击，回到登陆页login.jsp。要求：退出登录后，如果在浏览器直接输入主页main.jsp，访问不了，直接跳到登陆页。
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <!-- eight.jsp --> </head> <body> <form action="eight02.jsp" method="post" name="eight"> 请输入账号：<input name="name" type="text"/><br/> 请输入密码：<input name="password" type="password"/><br/> <input type="button" value="登录" onclick="denglu()"/> <script type="text/javascript"> function denglu(){ if(eight.name.value==""){ alert("账号不能为空！"); return; } if(eight.password.value==""){ alert("密码不能为空！"); return; } eight.submit(); } </script> </form> </body> </html>
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <!-- eight01.jsp --> </head> <body> <% String name=request.getParameter("name"); String password=request.getParameter("password"); if(name.equals(password)){ session.setAttribute("yhm", name); request.getRequestDispatcher("eight02.jsp").forward(request, response); }else{ request.getRequestDispatcher("eight04.jsp").forward(request, response); } %> </body> </html>
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <!-- eight02.jsp --> </head> <body> <% String name=(String) session.getAttribute("yhm"); if(name==null){ out.print("未登录，3秒后跳转登录页！"); response.setHeader("refresh", "3;url=eight.jsp"); } else{ out.print("用户名："+name+"登陆成功！"); %> <form action="eight03.jsp" method="post" > <input type="submit" value="退出登录" /> </form> <% } %> </body> </html>
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <!-- eight03.jsp --> </head> <body> <h3>退出成功，3秒后返回登录页！</h3> <% session.invalidate(); response.setHeader("refresh", "3;url=eight.jsp"); %> </body> </html>
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <!-- eight04.jsp --> </head> <body> <h3>登陆失败，3秒后返回登陆页</h3> <% session.invalidate(); response.setHeader("refresh", "3;url=eight.jsp"); %> </body> </html>
2.购物车
和上一题一起，在main.jsp中做一个购物车，里面显示3个商品名和价格 每一个后面有一个加入购物车按钮，main.jsp中有一个按钮（或者超链接）可以显示购物车。（选作：在购物车中加删除按钮删除商品
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <!-- eight05.jsp --> </head> <body> <% request.setCharacterEncoding("utf-8"); String name=(String) session.getAttribute("yhm"); if(name==null){ out.print("未登录，3秒后跳转登录页！"); response.setHeader("refresh", "3;url=eight.jsp"); } else{ out.print("用户名："+name+"登陆成功！"); %> <form action="tuichu.jsp" method="post" > <input type="submit" value="退出登录" /> </form> <% } %> <form action="eight05..jsp" method="post"> 苹果         价格：5 <input type="checkbox" value="苹果" name="sg" />加入购物车<br /> 橘子       价格：5 <input type="checkbox" value="橘子" name="sg"/>加入购物车<br /> 香蕉    价格：5.5 <input type="checkbox" value="香蕉" name="sg" />加入购物车<br /> <input type="submit" value="购买"/> </form> </script> </body> </html>
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <!-- eight06.jsp --> </head> <body> <% request.setCharacterEncoding("utf-8"); String itemName[]=request.getParameterValues("gwc"); if(itemName==null){ out.print("未添加购物车"); }else{ out.print("您购买的商品为："+"<br/>"); for(int i=0;i<itemName.length;i++){ out.print("("+(i+1)+")"+itemName[i]+"<br>"); } } %> <a href="eight05.jsp">返回</a> </body> </html>
