Java Web开发之基于Session的购物商店实现方法
本文实例讲述了JavaWeb开发之基于Session的购物商店实现方法。分享给大家供大家参考，具体如下：
packagecn.com.shopping;
importjava.io.IOException;
importjava.util.ArrayList;
importjava.util.List;
importjavax.servlet.ServletException;
importjavax.servlet.http.HttpServlet;
importjavax.servlet.http.HttpServletRequest;
importjavax.servlet.http.HttpServletResponse;
importjavax.servlet.http.HttpSession;
//完成购买
publicclassBuyServletextendsHttpServlet{
privatestaticfinallongserialVersionUID=1L;
protectedvoiddoGet(HttpServletRequestrequest,HttpServletResponseresponse)throwsServletException,IOException{
Stringid=request.getParameter("id");
Bookbook=(Book)Db.getAll().get(id);
//再加上那个关闭Cookie时session的剞劂方案
//阻止session的时候解决方案
HttpSessionsession=request.getSession(false);
//从session中得到用户的保存所有书的集合（购物车）
Listlist=(List)session.getAttribute("list");
if(list==null)
{
list=newArrayList();
session.setAttribute("list",list);
}
list.add(book);
Stringurl=response.encodeRedirectURL("/Session/SessionCountDemo");
response.sendRedirect(url);
}
protectedvoiddoPost(HttpServletRequestrequest,HttpServletResponseresponse)throwsServletException,IOException{
doGet(request,response);
}
}
packagecn.com.shopping;
importjava.io.IOException;
importjava.io.PrintWriter;
importjava.util.LinkedHashMap;
importjava.util.Map;
importjavax.servlet.ServletException;
importjavax.servlet.http.HttpServlet;
importjavax.servlet.http.HttpServletRequest;
importjavax.servlet.http.HttpServletResponse;
importjavax.servlet.http.HttpSession;
//显示书
publicclassListBookServletextendsHttpServlet{
privatestaticfinallongserialVersionUID=1L;
protectedvoiddoGet(HttpServletRequestrequest,HttpServletResponseresponse)throwsServletException,IOException{
response.setCharacterEncoding("UTF-8");
response.setContentType("text/html;charset=UTF-8");
PrintWriterout=response.getWriter();
HttpSessionsession=request.getSession();
out.print("本店有如下的商品：<br/>");
Map<String,Book>map=Db.getAll();
for(Map.Entry<String,Book>entry:map.entrySet())
{
Bookbook=entry.getValue();
Stringurl=response.encodeURL("/Session/BuyServlet?id="+book.getId());
out.print(book.getName()+"<ahref='"+url+"'target='_blank'>购买</a><br/>");
}
}
protectedvoiddoPost(HttpServletRequestrequest,HttpServletResponseresponse)throwsServletException,IOException{
doGet(request,response);
}
}
//Db作为数据库
classDb
{
privatestaticMap<String,Book>map=newLinkedHashMap();
static
{
map.put("1",newBook("1","JavaWEB开发","WY","好书"));
map.put("2",newBook("2","WEB开发","zt","一般"));
map.put("3",newBook("3","程序设计","df","较好书"));
map.put("4",newBook("4","计算机组成","as","一般好书"));
map.put("5",newBook("5","编译原理","ty","很好书"));
map.put("6",newBook("6","网络维护","hj","非常好书"));
}
publicstaticMapgetAll()
{
returnmap;
}
}
//书
classBook
{
privateStringid;
privateStringname;
privateStringauthor;
privateStringdescription;
publicBook(){
super();
//TODOAuto-generatedconstructorstub
}
publicBook(Stringid,Stringname,Stringauthor,Stringdescription){
super();
this.id=id;
this.name=name;
this.author=author;
this.description=description;
}
publicStringgetId(){
returnid;
}
publicvoidsetId(Stringid){
this.id=id;
}
publicStringgetName(){
returnname;
}
publicvoidsetName(Stringname){
this.name=name;
}
publicStringgetAuthor(){
returnauthor;
}
publicvoidsetAuthor(Stringauthor){
this.author=author;
}
publicStringgetDescription(){
returndescription;
}
publicvoidsetDescription(Stringdescription){
this.description=description;
}
}
packagecn.com.shopping;
importjava.io.IOException;
importjava.io.PrintWriter;
importjava.util.List;
importjavax.servlet.ServletException;
importjavax.servlet.http.HttpServlet;
importjavax.servlet.http.HttpServletRequest;
importjavax.servlet.http.HttpServletResponse;
importjavax.servlet.http.HttpSession;
publicclassSessionCountDemoextendsHttpServlet{
privatestaticfinallongserialVersionUID=1L;
protectedvoiddoGet(HttpServletRequestrequest,HttpServletResponseresponse)throwsServletException,IOException{
response.setCharacterEncoding("UTF-8");
response.setContentType("text/html;charset=UTF-8");
PrintWriterout=response.getWriter();
HttpSessionsession=request.getSession();
if(session==null)
{
out.write("您没买任何的商品！");
return;
}
out.write("您购买了如下的商品：");
List<Book>list=(List)session.getAttribute("list");
for(Bookbook:list)
{
out.write(book.getName());
}
}
protectedvoiddoPost(HttpServletRequestrequest,HttpServletResponseresponse)throwsServletException,IOException{
doGet(request,response);
}
}
希望本文所述对大家Javaweb程序设计有所帮助。