1.建立一个javaBean Book
package cn.itheima.domain;import java.io.Serializable;public class Book implements Serializable{private String id;private String name;private String description;private String author;private String price;public Book(){}public Book(String id, String name, String description, String author,String price) {super();this.id = id;this.name = name;this.description = description;this.author = author;this.price = price;}public String getId() {return id;}public void setId(String id) {this.id = id;}public String getName() {return name;}public void setName(String name) {this.name = name;}public String getDescription() {return description;}public void setDescription(String description) {this.description = description;}public String getAuthor() {return author;}public void setAuthor(String author) {this.author = author;}public String getPrice() {return price;}public void setPrice(String price) {this.price = price;}}2.建立BookDao模拟数据库
package cn.itheima.dao;import java.util.LinkedHashMap;import java.util.Map;import cn.itheima.domain.Book;public class BookDao {private static Map<String,Book> books=new LinkedHashMap<String, Book>();//进行初始化static{books.put("1", new Book("1", "水浒传", "105个爷们和3个女人登上梁山的故事…", "李卫康", "50.0"));books.put("2", new Book("2", "金瓶梅", "不堪入目的故事…", "金庸", "10.2"));books.put("3", new Book("3", "西游记", "一个和尚，，一个猴子，一个肥猪和一个秃子去西天取经的故事…", "韩玮", "100.5"));books.put("4", new Book("4", "三国演义", "三国时期打仗的故事…", "翁宗顺", "30.1"));}public static Book getBook(String id){return books.get(id);}public static Map<String,Book> getBooks(){return books;}}3.建立图书列表的BookListServlet
package cn.itheima.cookie;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 cn.itheima.dao.BookDao;import cn.itheima.domain.Book;public class BookListServlet extends HttpServlet {public void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {response.setContentType("text/html;charset=utf-8");//1.从数据库中查询显示图书的信息Map<String, Book> books = BookDao.getBooks();for(Map.Entry<String, Book> id:books.entrySet()){Book book = id.getValue();response.getWriter().write("<a href='"+request.getContextPath()+"/servlet/BookInfoServlet?id="+book.getId()+"'>"+book.getName()+"</a><br/>");}}public void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {doGet(request, response);}}4.建立BookInfoServlet进行图书的详细信息显示
package cn.itheima.cookie;import java.io.IOException;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 cn.itheima.dao.BookDao;import cn.itheima.domain.Book;public class BookInfoServlet extends HttpServlet {public void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {response.setContentType("text/html;charset=utf-8");//1.得到书的idString id = request.getParameter("id");Book book = BookDao.getBook(id);//2.显示书的信息response.getWriter().write("<h3>"+"书名："+book.getName()+"<h3/>");response.getWriter().write("<h3>"+"作者："+book.getAuthor()+"<h3/>");response.getWriter().write("<h3>"+"售价："+book.getPrice()+"<h3/>");response.getWriter().write("<h3>"+"描述："+book.getDescription()+"<h3/>");//上次浏览的书籍Cookie[] cookies = request.getCookies();Cookie findC=null;if(cookies!=null){for(Cookie c:cookies){findC=c;}}if(findC==null){response.getWriter().write("<hr/>没有浏览记录！");}else{String value = findC.getValue();response.getWriter().write("<hr/>您上次浏览的书籍是："+BookDao.getBook(value).getName());}//设置cookieCookie c=new Cookie("id",book.getId());response.addCookie(c);}public void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {doGet(request, response);}}5.运行结果：
发现一种久违的感动。
