servlet之cookie实现
三个servlet的实现:
package app02c;
import java.io.IOException;
import java.io.PrintWriter;
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;
/**
* Cookies的实现(设置cookie)
*/
@WebServlet( name = "PreferenceServlet", urlPatterns = "/preference")
public class PreferenceServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
// 主菜单
public static final String MENU =
"<div style='background:#e8e8e8;"
+ "padding:15px'>"
+ "<a href='cookieClass'>Cookie Class</a> "
+ "<a href='cookieInfo'>Cookie Info</a> "
+ "<a href='preference'>Preference</a>" + "</div>";
/**
* @see HttpServlet#HttpServlet()
*/
public PreferenceServlet() {
super();
// TODO Auto-generated constructor stub
}
/**
* 主页的选择
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
response.setContentType("text/html");
PrintWriter writer = response.getWriter();
writer.print("<html><head>" + "<title>Preference</title>"
+ "<style>table {" + "font-size:small;"
+ "background:NavajoWhite }</style>"
+ "</head><body>"
+ MENU
+ "Please select the values below:"
+ "<form method='post'>"
+ "<table>"
+ "<tr><td>Title Font Size: </td>"
+ "<td><select name='titleFontSize'>"
+ "<option>large</option>"
+ "<option>x-large</option>"
+ "<option>xx-large</option>"
+ "</select></td>"
+ "</tr>"
+ "<tr><td>Title Style & Weight: </td>"
+"<td><select name='titleStyleAndWeight' multiple>"
+ "<option>italic</option>"
+ "<option>bold</option>"
+ "</select></td>"
+ "</tr>"
+ "<tr><td>Max. Records in Table: </td>"
+ "<td><select name='maxRecords'>"
+ "<option>5</option>"
+ "<option>10</option>"
+ "</select></td>"
+ "</tr>"
+ "<tr><td rowspan='2'>"
+ "<input type='submit' value='Set'/></td>"
+ "</tr>"
+ "</table>" + "</form>" + "</body></html>");
}
/**
* 设置cookie
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
String maxRecords = request.getParameter("maxRecords");
// 下拉列表multiple属性的获取方式
String[] titleStyleAndWeight = request
.getParameterValues("titleStyleAndWeight");
String titleFontSize =
request.getParameter("titleFontSize");
// 设置cookie
response.addCookie(new Cookie("maxRecords", maxRecords));
response.addCookie(new Cookie("titleFontSize",
titleFontSize));
// delete titleFontWeight and titleFontStyle cookies first
// Delete cookie by adding a cookie with the maxAge = 0;
Cookie cookie = new Cookie("titleFontWeight", "");
cookie.setMaxAge(0);
response.addCookie(cookie);
cookie = new Cookie("titleFontStyle", "");
cookie.setMaxAge(0);
response.addCookie(cookie);
if (titleStyleAndWeight != null) {
for (String style : titleStyleAndWeight) {
if (style.equals("bold")) {
// 添加cookie
response.addCookie(new
Cookie("titleFontWeight", "bold"));
} else if (style.equals("italic")) {
response.addCookie(new Cookie("titleFontStyle",
"italic"));
}
}
}
response.setContentType("text/html");
PrintWriter writer = response.getWriter();
writer.println("<html><head>" + "<title>Preference</title>"
+ "</head><body>" + MENU
+ "Your preference has been set."
+ "<br/><br/>Max. Records in Table: " + maxRecords
+ "<br/>Title Font Size: " + titleFontSize
+ "<br/>Title Font Style & Weight: ");
// titleStyleAndWeight will be null if none of the options
// was selected
if (titleStyleAndWeight != null) {
writer.println("<ul>");
for (String style : titleStyleAndWeight) {
writer.print("<li>" + style + "</li>");
}
writer.println("</ul>");
}
writer.println("</body></html>");
}
}
package app02c;
import java.io.IOException;
import java.io.PrintWriter;
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;
/**
* 显示数据,根据接受的cookie来选择输出数量
*/
@WebServlet( name = "CookieClassServlet", urlPatterns = "/cookieClass")
public class CookieClassServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
// 设置显示的数据
private String[] methods = {
"clone", "getComment", "getDomain",
"getMaxAge", "getName", "getPath",
"getSecure", "getValue", "getVersion",
"isHttpOnly", "setComment", "setDomain",
"setHttpOnly", "setMaxAge", "setPath",
"setSecure", "setValue", "setVersion"
};
/**
* @see HttpServlet#HttpServlet()
*/
public CookieClassServlet() {
super();
// TODO Auto-generated constructor stub
}
/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// 获取cookie
Cookie[] cookies = request.getCookies();
Cookie maxRecordsCookie = null;
if (cookies != null) {
// 遍历cookie
for (Cookie cookie : cookies) {
if (cookie.getName().equals("maxRecords")) {
maxRecordsCookie = cookie;
break;
}
}
}
int maxRecords = 5; // default
if (maxRecordsCookie != null) {
try {
maxRecords = Integer.parseInt(
maxRecordsCookie.getValue());
} catch (NumberFormatException e) {
// do nothing, use maxRecords default value
}
}
response.setContentType("text/html");
PrintWriter writer = response.getWriter();
writer.print("<html><head>" + "<title>Cookie Class</title>"
+ "</head><body>"
+ PreferenceServlet.MENU
+ "<div>Here are some of the methods in " +
"javax.servlet.http.Cookie");
writer.print("<ul>");
for (int i = 0; i < maxRecords; i++) {
writer.print("<li>" + methods[i] + "</li>");
}
writer.print("</ul>");
writer.print("</div></body></html>");
}
/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
doGet(request, response);
}
}
package app02c;
import java.io.IOException;
import java.io.PrintWriter;
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;
/**
* 根据接受到cookie来显示详细信息
*/
@WebServlet(name = "CookieInfoServlet", urlPatterns = "/cookieInfo")
public class CookieInfoServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* @see HttpServlet#HttpServlet()
*/
public CookieInfoServlet() {
super();
// TODO Auto-generated constructor stub
}
/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
Cookie[] cookies = request.getCookies();
StringBuilder styles = new StringBuilder();
// 设置修饰
styles.append(".title {");
if (cookies != null) {
// 根据设置的cookie显示
for (Cookie cookie : cookies) {
String name = cookie.getName();
String value = cookie.getValue();
if (name.equals("titleFontSize")) {
styles.append("font-size:" + value + ";");
} else if (name.equals("titleFontWeight")) {
styles.append("font-weight:" + value + ";");
} else if (name.equals("titleFontStyle")) {
styles.append("font-style:" + value + ";");
}
}
}
styles.append("}");
response.setContentType("text/html");
PrintWriter writer = response.getWriter();
writer.print("<html><head>" + "<title>Cookie Info</title>"
+ "<style>" + styles.toString() + "</style>"
+ "</head><body>" + PreferenceServlet.MENU
+ "<div class='title'>"
+ "Session Management with Cookies:</div>");
writer.print("<div>");
// cookies will be null if there's no cookie
if (cookies == null) {
writer.print("No cookie in this HTTP response.");
} else {
writer.println("<br/>Cookies in this HTTP response:");
// 显示cookie
for (Cookie cookie : cookies) {
writer.println("<br/>" + cookie.getName() + ":"
+ cookie.getValue());
}
}
writer.print("</div>");
writer.print("</body></html>");
}
/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
doGet(request, response);
}
}
servlet之cookie实现的更多相关文章
- Servlet/JSP-05 Cookie
一. 问题? HTTP协议是一种无状态协议,服务器本身无法识别出哪些请求是同一个浏览器发出的,浏览器的每一次请求都是独立的.现实业务中服务器有时候需要识别来自同一个浏览器的一系列请求,例如购物车,登录 ...
- Servlet 利用Cookie实现一周内不重复登录
import java.io.IOException;import java.io.PrintWriter; import javax.servlet.ServletException;import ...
- JavaWeb学习记录总结（二十九）--Servlet\Session\Cookie\Filter实现自动登录和记住密码
一.Servlet package autologin.servlet.login; import java.io.IOException;import java.security.MessageDi ...
- 动手学servlet(四) cookie和session
Cookie cookie是保存在客户端的一个“键值对”,用来存储用户的一些信息 cookie的应用: -在电子商务会话中标识用户 -对网站进行定制,比如你经常浏览哪些内容,就展示哪些页面给你 - ...
- Servlet & JSP - Cookie
关于 Cookie 的内容,参考 HTTP - Cookie 机制 获取来自客户端的 cookie request.getCookies 方法可以获取来自 HTTP 请求的 cookie,返回的是 j ...
- Servlet 笔记-Cookie 处理
Cookie 是存储在客户端计算机上的文本文件,并保留了各种跟踪信息. 识别返回用户包括三个步骤: 服务器脚本向浏览器发送一组 Cookie.例如:姓名.年龄或识别号码等. 浏览器将这些信息存储在本地 ...
- Type mismatch: cannot convert from javax.servlet.http.Cookie[] to org.apache.tomcat.util.http.parser.Cookie[] 的一种可能
今天用到Cookie时,写了一个Cookie数组,发现报错“Type mismatch: cannot convert from javax.servlet.http.Cookie[] to org. ...
- java用servlet、cookie实现一个阅读记录
效果如图 代码1 package com.xiaostudy.servlet; import java.io.IOException; import java.io.PrintWriter; impo ...
- servlet(5) - Cookie和session - 小易Java笔记
1.会话概述 (1)会话可简单理解为:用户开一个浏览器,点击多个超链接,访问服务器多个web资源,然后关闭浏览器,整个过程称之为一个会话. (2)会话过程中的数据不宜保存在request和servle ...
随机推荐
- [Scala] 了解 协变 与 逆变
首先定义一个类 A,其参数类型 T 为协变,类中包含一个方法 func,该方法有一个类型为 T 的参数: class A[+T] { def func(x: T) {} } 此时在 x 处会有异常提示 ...
- C++中输出流的刷新问题和 endl和 \n的区别
<C++ Primer>第5版 P6中提到endl具有换行和刷新输出流两个作用,那么没有 endl是否还会将输出流中的内容输出到设备中,再刷新输出流呢? cout << &qu ...
- 【Nginx系列】Nginx编译与安装
Nginx是一个高性能的HTTP和反向代理服务器,也是一个IMAP/POP3/SMTP代理服务器.Nginx是由Igor Sysoev为俄罗斯访问第二的Rambler.ru站点开发的. 一.Nginx ...
- Win7(64Bit旗舰版) 安装 PL/SQL Developer图解说明
Win7逐渐成为现行主流的windows操作系统,其32和64位系统平分秋色.然而当下还没有64位的PL/SQL Developer问世,直接用32位的PL/SQL Developer连接Win7(6 ...
- 听翁恺老师mooc笔记（12）--结构中的结构
结构数组: 和C语言中的int,double一样,一旦我们做出一个结构类型,就可以定义这个结构类型的变量,也可以定义这个结构类型的数组.比如下面这个例子: struct date dates[100] ...
- Java 后端微信小程序支付demo (网上说的坑里面基本上都有)
Java 后端微信小程序支付 一.遇到的问题 1. 商户号该产品权限未开通,请前往商户平台>产品中心检查后重试 2.签名错误 3.已经调起微信统一下单接口,可以拿到预支付ID,但是前端支付的时候 ...
- JAVA_SE基础——5.第一个Java程序HelloWorld&注释的应用
配置完JDK&环境变量后,我们就可以开始写程序了,那么程序怎么写呢,用什么工具呢,我建议 为了方便学习,我们最好在一个磁盘下建立一个专门的文件来写java程序,比如就在D盘下建立一个名为&qu ...
- Java服务器端生成报告文档：使用SQL Server Report Service（SSRS）
SQL Server Report Service(SSRS)提供了Asp.Net和WinForm两类客户端组件封装,因此使用C#实现SSRS报表的导出功能,仅需要使用相应的组件即可. Java操作S ...
- tomca配置文件自动还原问题的解决 server.xml content.xml 等
当我们在处理中文乱码或是配置数据源时,我们要修改Tomcat下的server.xml和content.xml文件. 但是当我们修改完后重启Tomcat服务器时发现xml文件又被还原了,修改无效果. 为 ...
- 新概念英语（1-95）Tickets,please!
Lesson 95 Tickets, please. 请把车票拿出来. Listen to the tape then answer this question. Why did George and ...