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cookie技术案例-用户浏览商品的记录

2014-05-19 17:13 513 查看

项目名称：/cookieDemo2Record

需求:

模拟用户在网上商城，浏览商品，同时显示商品的浏览记录

1.查询所有商品页面-index.jsp/index.html

a.查询所有商品的按钮-----FindAllBooksServlet.java-com.ghsy.servlet

2.显示商城的商品

a.用bean存储商品-com.ghsy.domain

b.db包中的方法构造商品数据-com.ghsy.db

c.用jsp页面显示商品的信息-show.jsp

  1.用表格列表的方式显示商品的信息。

  2.表格的最后一个字段，添加查询详情----FindBookByIDServlet.java-com.ghsy.servlet

  3.查询缓存，显示已经查看过的列表在所有商品信息的下方

3.记录查询记录

a.点击查询详情按钮，显示商品的详细信息--showDetial.jsp

b.保存已经查询过的商品信息到缓存中

  缓存的选择-cookie

c.在显示商品的详情页，添加返回按钮，返回所有商品列表页

d.回到商品列表页（回到上面的2，所以2中需要添加获取缓存信息，并显示）

项目目录结构：

项目源码：

index.jsp

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
<a href="/cookieDemo2Record/FindAllBooksServlet">查询所有</a>
</body>
</html>

show.jsp

<%@page import="java.util.HashMap"%>
<%@page import="com.ghsy.domain.Book"%>
<%@page import="java.util.Map"%>
<%@ 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>
<h3>所有商品信息</h3>
<table  border="1">
<tr>
<td>编号</td>
<td>书名</td>
<td>作者</td>
<td>价格</td>
<td>详情</td>
</tr>

<%
Map<String,Book> bookMap=(Map<String,Book>)request.getAttribute("bookMap");
for(Map.Entry<String,Book> entry:bookMap.entrySet()){
Book book=entry.getValue();
%>
<tr>
<td><%=book.getId() %></td>
<td><%=book.getTitle() %></td>
<td><%=book.getAnthor() %></td>
<td><%=book.getPrice() %></td>
<td><a href="/cookieDemo2Record/FindBookByIDServlet?id=<%=book.getId()%>">点击详情</a></td>
</tr>
<%
}
%>
</table>
<h3>浏览的商品记录：</h3>
<%
String bookCacheIds=null;
Cookie[] cookies=request.getCookies();
if(cookies!=null){
for(Cookie cookie:cookies){
if("bookCacheIds".equals(cookie.getName())){
bookCacheIds=cookie.getValue();
System.out.println("已经查询过的商品的id"+bookCacheIds);
out.print("<br>"+bookCacheIds+"<br>");
}
}
}
%>
</body>
</html>

showdetails.jsp

<%@page import="com.ghsy.domain.Book"%>
<%@ 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>
<h3>详细信息：</h3>
<%
Book book=(Book)request.getAttribute("book");
%>
<table>
<tr>
<td><%=book.getId() %></td>
<td><%=book.getTitle() %></td>
<td><%=book.getAnthor() %></td>
<td><%=book.getPrice()%></td>
<td>是有那么一堆的描述是不是啊，给力的</td>
</tr>
<a href="/cookieDemo2Record/FindAllBooksServlet">返回</a>
</table>
</body>
</html>

BookDB.java

package com.ghsy.db;

import java.util.HashMap;
import java.util.Map;

import com.ghsy.domain.Book;
//需要提高一个能力---如何选择数据结构
public class BookDB {
//选择Map来存储信息  key，value：id，
public static Map<String, Book> bookMap=new HashMap<String, Book>();
//static 代码区域模拟商品的数据信息
static{
bookMap.put("p001", new Book("p001", "java", "leon", "98"));
bookMap.put("p002", new Book("p002", "android", "胡玉勉", "98"));
bookMap.put("p003", new Book("p003", "c#", "刘德华", "76"));
bookMap.put("p004", new Book("p004", "object c", "藏学有", "87"));
}
//获得所有模拟数据的信心
public static Map<String, Book> getData(){
return bookMap;
}
//根据编号查询book的详细信息
public static Book findBookByID(String id){
Book book=null;
for(Map.Entry<String, Book> entry:bookMap.entrySet()){
if(id.equals(entry.getValue().getId())){
book=entry.getValue();
}
}
return book;
}
}

Book.java

package com.ghsy.domain;

public class Book {
private String id;
private String title;
private String anthor;
private String price;

public Book() {
super();
// TODO Auto-generated constructor stub
}
public Book(String id, String title, String anthor, String price) {
super();
this.id = id;
this.title = title;
this.anthor = anthor;
this.price = price;
}
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public String getAnthor() {
return anthor;
}
public void setAnthor(String anthor) {
this.anthor = anthor;
}
public String getPrice() {
return price;
}
public void setPrice(String price) {
this.price = price;
}

}

FindAllBookServlet.java

package com.ghsy.servlet;

import java.io.IOException;
import java.util.Map;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.ghsy.db.BookDB;
import com.ghsy.domain.Book;

public class FindAllBooksServlet extends HttpServlet {
private static final long serialVersionUID = 1L;

protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
//test
System.out.println("doGet() FindAllBooksServlet ");
//获取所有商品信息
Map<String,Book> bookMap=BookDB.getData();
//request 对象存储book信息，跳转到另一个servlet（show.jsp页面）---共享数据操作
//直接将bookMap存储。
request.setAttribute("bookMap", bookMap);
//跳转
request.getRequestDispatcher("show.jsp").forward(request, response);
}

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
}

}

FindBookByIdServlet.java

package com.ghsy.servlet;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

import javax.servlet.ServletException;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.ghsy.db.BookDB;
import com.ghsy.domain.Book;

/**
* Servlet implementation class FindBookByIDServlet
*/
public class FindBookByIDServlet extends HttpServlet {
private static final long serialVersionUID = 1L;

protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
System.out.println("doGet FindBookByIDServlet");
String id=request.getParameter("id");
System.out.println("所查询商品的详情id:"+id);
Book book=BookDB.findBookByID(id);
//request 属性存储信息
request.setAttribute("book", book);
//对已经查询过的商品详情保存到cookie中
//#1.获取本次请求的对应cookie;有可能是第一次访问，没有cookie哦
Cookie[] cookies=request.getCookies();
String bookCacheIds=null;
if(cookies!=null){
for(Cookie cookie:cookies){
if("bookCacheIds".equals(cookie.getName())){
bookCacheIds=cookie.getValue();
break;
}
}
}
//#2指定顺序 拼写所有id
List<String> idsList = new ArrayList<String>();
idsList.add(id);//首先添加当前的id
// #2.1 将cookie缓存数据使用逗号分隔
if(bookCacheIds != null){
String[] cookieIds = bookCacheIds.split(", ");
for(String tempid : cookieIds){
if(!tempid.equals(id)){	//当前商品id已经在第一位
idsList.add(tempid);
}
}
}
//将cookie缓存，并发送了浏览器端
String idsStr=idsList.toString();
System.out.println(idsStr);
Cookie cookie=new Cookie("bookCacheIds",idsStr.substring(1, idsStr.length()-1));
cookie.setPath("/");
response.addCookie(cookie);
//跳转到详细信息页面
request.getRequestDispatcher("/showDetails.jsp").forward(request, response);
}
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
}

}

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标签： cookie缓存技术用户浏览记录

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