设计程序,用户选择选择喜好的背景颜色(红/黄/绿),提交后创建Cookie并存储用户名及颜色信息,cookie有效期设置为300秒,然后在当前servlet中跳转到test.jsp页面,在test.jsp页面显示用户名,及改变页面的背景颜色。 注意不要使用Eclipse内置浏览器,随后关闭浏览器,再重新打印浏览器,直接访问text.jsp
在输入用户登录时候请不要输入汉字,否则报Cookie值或属性中的控制字符异常
<%@ 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>
<form action="servlet" method="post">
用户名:<input type="text" id="name" name="name"><br>
挑选颜色:<input type="radio" id="color1" name="color" value="red">红
<input type="radio" id="color2" name="color" value="yellow">黄
<input type="radio" id="color3" name="color" value="green">绿
<input type="submit" value="提交">
</form>
</body>
</html>
package servlet;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
* Servlet implementation class Servlet
*/
@WebServlet("/servlet")
public class Servlet extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* @see HttpServlet#HttpServlet()
*/
public Servlet() {
super();
// TODO Auto-generated constructor stub
}
/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
response.getWriter().append("Served at: ").append(request.getContextPath());
}
/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
request.setCharacterEncoding("utf-8");
response.setContentType("text/html;charset=utf-8");
String name = request.getParameter("name");
String color = request.getParameter("color");
Cookie c1 = new Cookie("name", name);
Cookie c2 = new Cookie("color", color);
c1.setMaxAge(60*5);
c2.setMaxAge(60*5);
response.addCookie(c1);
response.addCookie(c2);
request.getSession().setAttribute("name", name);
request.getSession().setAttribute("color", color);
response.sendRedirect("test.jsp");
}
}
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8" %>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<!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>
<%
String name = null;
Cookie [] cookie = request.getCookies();
for(int i=0;i<cookie.length;i++){
name=cookie[i].getValue();
if(i==0){
break;
}
}
String color = null;
for(int i=1;i<cookie.length;i++){
color=cookie[i].getValue();
if(i==0){
break;
}
}
%>
<body bgcolor="<%=color %>">
欢迎您:<%=name %>
<%=color %>
</body>
</html>