Java uses cookies to display recently viewed books _java

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1.ben Package

Import java.io.Serializable;
 public class book implements Serializable {private String ID;
 private String name;
 Private String Price;
 Private String auth;
 Private String publish;
  
 Private String description; Public book () {} public book (string ID, string name, string price, String auth, string publish, String Descriptio
  N) {super ();
  This.id = ID;
  THIS.name = name;
  This.price = Price;
  This.auth = auth;
  This.publish = publish;
 this.description = description;
 Public String GetDescription () {return description;
 } public void SetDescription (String description) {this.description = description;
 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 GetPrice () {return price;
 public void Setprice (String price) {this.price = Price;
Public String GetAuth () {return auth; } public void Setauth (String auth) {This.auth = auth;
 Public String Getpublish () {return publish;
 } public void Setpublish (String publish) {this.publish = publish;
 }
 
}

2.Dao Package

Import Java.util.LinkedHashMap;
Import Java.util.Map;
 
Import Cn.huiyu.ben.Book;
 
 
 
public class Bookdao {
 private static map<string,book> Bookmap = new linkedhashmap<string, book> ();
 Private Bookdao () {
 }
 static{
  bookmap.put ("1", New book ("1", "1111", "11.0", "Zqwang", "111 publishers", "111111111 "));
  Bookmap.put ("2", New book ("2", "2222", "22.0", "Zqwang", "222 publishing house", "222222222"));
  Bookmap.put ("3", New book ("3", "3333", "33.0", "Zqwang", "333 publishing house", "333333333"));
 }
  
 public static map<string,book> Getbooks () {return
  bookmap;
 }
  
 public static book GetBook (String ID) {return
  bookmap.get (ID);
 }
}

3.servlet

public void doget (HttpServletRequest request, httpservletresponse response) throws Servletexception, IOException {R
  Esponse.setcontenttype ("Text/html;charset=utf-8");
  1. Query the database all the books show map<string,book> Map = Bookdao.getbooks ();
   For (map.entry<string, book> entry:map.entrySet ()) {Book book = Entry.getvalue (); Response.getwriter (). Write ("<a href= '" +request.getcontextpath () + "/servlet/bookinfoservlet?id=" +book.getId () +
  "' >" +book.getname () + "</a><br>");
   
  } response.getwriter (). Write (" 

4.servlet

public void doget (HttpServletRequest request, httpservletresponse response) throws Servletexception, IOException {R
  Esponse.setcontenttype ("Text/html;charset=utf-8");
  1. Get the ID of the book to read, query the database to find the book, output the details of the book String id = request.getparameter ("id");
  Book book = Bookdao.getbook (ID);
   if (book==null) {response.getwriter (). Write ("Can't find this book!");
  Return
   }else{response.getwriter (). Write (" 

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