教你使用cookie法，查看最近看過(guò)的書(shū)-創(chuàng)新互聯(lián)

教你使用cookie法，查看最近看過(guò)的書(shū)
import java.io.Serializable;

成都創(chuàng)新互聯(lián)公司是專業(yè)的宜章網(wǎng)站建設(shè)公司，宜章接單;提供成都做網(wǎng)站、成都網(wǎng)站設(shè)計(jì),網(wǎng)頁(yè)設(shè)計(jì),網(wǎng)站設(shè)計(jì),建網(wǎng)站,PHP網(wǎng)站建設(shè)等專業(yè)做網(wǎng)站服務(wù);采用PHP框架,可快速的進(jìn)行宜章網(wǎng)站開(kāi)發(fā)網(wǎng)頁(yè)制作和功能擴(kuò)展;專業(yè)做搜索引擎喜愛(ài)的網(wǎng)站,專業(yè)的做網(wǎng)站團(tuán)隊(duì),希望更多企業(yè)前來(lái)合作!

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 description) {
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;
}

}
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html;charset=utf-8");
//1.獲取要看的書(shū)的id,查詢數(shù)據(jù)庫(kù)找出書(shū),輸出書(shū)的詳細(xì)信息
String id = request.getParameter("id");
Book book = BookDao.getBook(id);
if(book==null){
response.getWriter().write("找不到這本書(shū)!");
return;
}else{
response.getWriter().write("

書(shū)名:"+book.getName()+"

");
response.getWriter().write("

作者:"+book.getAuth()+"

");
response.getWriter().write("

售價(jià):"+book.getPrice()+"

");
response.getWriter().write("

出版社:"+book.getPublish()+"

");
response.getWriter().write("

描述信息:"+book.getDescription()+"

");
}

//2.發(fā)送cookie保存最后看過(guò)的書(shū)
// --- 1 --> 1
// 1 --2,1 --> 2,1
// 2,1--3,2,1 --> 3,2,1
// 3,2,1 -- 4,3,2 --> 4,3,2
// 4,3,2 --3,4,2 --> 3,4,2
String ids = "";

Cookie [] cs = request.getCookies();
Cookie findC = null;
if(cs!=null){
for(Cookie c : cs){
if("last".equals(c.getName())){
findC = c;
}
}
}

if(findC == null){
//說(shuō)明之前沒(méi)有看過(guò)書(shū)的記錄
ids += book.getId();
}else{
//說(shuō)明之前有歷史看過(guò)的書(shū)的記錄,需要根據(jù)歷史記錄算一個(gè)新的記錄出來(lái)
String [] olds = findC.getValue().split(",");
StringBuffer buffer = new StringBuffer();
buffer.append(book.getId()+",");
for(int i = 0;iString old = olds[i];
if(!old.equals(book.getId())){
buffer.append(old+",");
}
}
ids = buffer.substring(0, buffer.length()-1);
}

Cookie lastC = new Cookie("last",ids);
lastC.setMaxAge(36002430);
lastC.setPath(request.getContextPath());
response.addCookie(lastC);
}

名稱欄目：教你使用cookie法，查看最近看過(guò)的書(shū)-創(chuàng)新互聯(lián)
當(dāng)前URL：http://m.jiaotiyi.com/article/hhoos.html