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2023-07-19
Java使用cookie显示最近查看过的书
本文实例为大家分享了java使用cookie显示最近查看过的书的相关方法,供大家参考,具体内容如下
1.ben包
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 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;
}
}
2.Dao包
import java.util.LinkedHashMap;
import java.util.Map;
import cn.huiyu.ben.Book;
public class BookDao {
private static Map
private BookDao() {
}
static{
bookMap.put("1", new Book("1","1111","11.0","zqwang","111出版社","111111111"));
bookMap.put("2", new Book("2","2222","22.0","zqwang","222出版社","222222222"));
bookMap.put("3", new Book("3","3333","33.0","zqwang","333出版社","333333333"));
}
public static Map
return bookMap;
}
public static Book getBook(String id){
return bookMap.get(id);
}
}
3.servlet
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html;charset=utf-8");
//1.查询数据库中所有的书展示
Map
for(Map.Entry
Book book = entry.getValue();
response.getWriter().write(""+book.getName()+"
");
}
response.getWriter().write("
//2.显示之前看过的书
Cookie [] cs = request.getCookies();
Cookie findC = null;
if(cs!=null){
for(Cookie c : cs){
if("last".equals(c.getName())){
findC = c;
}
}
}
if(findC == null){
response.getWriter().write("没有看过任何书!");
}else{
response.getWriter().write("您曾经浏览过的书:
");
String[] ids = findC.getValue().split(",");
for(String id : ids){
Book book = BookDao.getBook(id);
response.getWriter().write(book.getName()+"
");
}
}
}
4.servlet
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.FzIVANsetContentType("text/html;charset=utf-8");
//1.获取要看的书的id,查询数据库找出书,输出书的详细信息
String id = request.getParameter("id");
Book book = BookDao.getBook(id);
if(book==null){
response.getWriter().write("找不到这本书!");
return;
}else{
response.getWriter().write("
response.getWriter().write("
response.getWriter().write("
response.getWriter().write("
response.getWriter().write("
}
//2.发送cookie保存最后看过的书
// --- 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){
//说明之前没有看过书的记录
ids += book.getId();
}else{
//说明之前有历史看过的书的记录,需要根据历史记录算一个新的记录出来
String [] olds = findC.getValue().split(",");
StringBuffer buffer = new StringBuffer();
buFzIVANffer.append(book.getId()+",");
for(int i = 0;i String 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(3600*24*30); lastC.setPath(request.getContextPath()); response.addCookie(lastC); } 以上就是本文的全部内容,希望对大家学习Java使用cookie显示最近查看过的书的方法有所帮助。
String 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(3600*24*30);
lastC.setPath(request.getContextPath());
response.addCookie(lastC);
}
以上就是本文的全部内容,希望对大家学习Java使用cookie显示最近查看过的书的方法有所帮助。
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