javaWeb的session实现购物车
2016-03-01 22:46
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javaWeb的session实现购物车案例
- 1、先建立商品列表的jsp页面：<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>session购物车应用案例</title> </head> <body> <h3>请选择购买商品</h3> <form action="<%=request.getContextPath()%>/product" method="post"> <table border="1" cellpadding="10" cellspacing="0"> <tr> <td>书名</td> <td>加入购物车</td> </tr> <tr> <td>Mysql</td> <td><input type="checkbox" name="book" value="Mysql" /></td> </tr> <tr> <td>sqlServer</td> <td><input type="checkbox" name="book" value="sqlServer" /></td> </tr> <tr> <td>mongodb</td> <td><input type="checkbox" name="book" value="mongodb" /></td> </tr> <tr> <td>java</td> <td><input type="checkbox" name="book" value="java" /></td> </tr> <tr> <td>c</td> <td><input type="checkbox" name="book" value="c" /></td> </tr> <tr> <td>jquery</td> <td><input type="checkbox" name="book" value="jquery" /></td> </tr> <tr> <td>html</td> <td><input type="checkbox" name="book" value="html" /></td> </tr> <tr> <td><input type="submit" value="加入购物车" /></td> </tr> </table> </form> </body> </html>
- 2.建立一个servlet，用于session保存商品信息：
package session;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
*
* 把数据存到sesssion
*
* @version 1.0
* @since JDK1.7
* @date 2016年3月1日 上午10:24:40
*/
public class ProductServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
//或取所有的值
String [] book=request.getParameterValues("book");
//把图书信息放到HttpSession中
request.getSession().setAttribute("book", book);
//重定向(绝对路径)
response.sendRedirect(request.getContextPath()+"/sessionByShoppingCart/userinfo.jsp");
}
}- 3.配置一下该ProductServlet
<servlet> <description></description> <servlet-name>ProductServlet</servlet-name> <servlet-class>session.ProductServlet</servlet-class> </servlet> <servlet-mapping> <servlet-name>ProductServlet</servlet-name> <url-pattern>/product</url-pattern> </servlet-mapping>
4.在建一个客户的收获基本信息的jsp:
<%@page import="java.util.ArrayList"%> <%@page import="java.util.List"%> <%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>Insert title here</title> </head> <body> <h3>请填写收货信息</h3> <form action="<%=request.getContextPath()%>/userinfo" method="post"> <table border="1" cellpadding="10" cellspacing="0"> <tr> <td colspan="2" align="center">收货基本信息</td> </tr> <tr> <td>收货人：</td> <td><input type="text" name="name" /></td> </tr> <tr> <td>收货地址：</td> <td><input type="text" name="address" /></td> </tr> <tr> <td>联系电话：</td> <td><input type="text" name="phone" /></td> </tr> <tr> <td colspan="2" align="center">支付信息</td> </tr> <tr> <td>支付类别：</td> <td><input type="radio" name="type" value="wangyin" />网银 <input type="radio" name="type" value="zhifubao"/>支付宝 </td> </tr> <tr> <td>账号：</td> <td><input type="text" name="account" /></td> </tr> <tr> <td colspan="2"><input type="submit" value="提交" /></td> </tr> </table> </form> </body> </html>
5.一样的，也建立一个servlet实现信息的存储：
package session;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
public class UserinfoServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
//获取参数
String name=request.getParameter("name");
String address=request.getParameter("address");
String phone=request.getParameter("phone");
String type=request.getParameter("type");
String account=request.getParameter("account");
//将参数放入session中
UserInfo user =new UserInfo(name, address, type, account,phone);//直接封装一个对象用来接收
HttpSession session=request.getSession();
session.setAttribute("name", user);
//重定向
response.sendRedirect(request.getContextPath()+"/sessionByShoppingCart/pay.jsp");
}
}6.可以封装一个用户类来接收参数，便于存取：
package session;
public class UserInfo {
private String name;
private String address;
private String phone;
private String type ;
private String account;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getPhone() {
return phone;
}
public void setPhone(String phone) {
this.phone = name;
}
public String getAddress() {
return address;
}
public void setAddress(String address) {
this.address = address;
}
public String getType() {
return type;
}
public void setType(String type) {
this.type = type;
}
public String getAccount() {
return account;
}
public void setAccount(String account) {
this.account = account;
}
//带参的构造器==便于初始化
public UserInfo(String name, String address, String type, String account,String phone) {
super();
this.name = name;
this.address = address;
this.type = type;
this.account = account;
this.phone=phone;
}
//无参的构造器==便于反射
public UserInfo(){}
}7.也给该UserinfoServlet配置一下
<servlet> <description></description> <servlet-name>userinfoServlet</servlet-name> <servlet-class>session.UserinfoServlet</servlet-class> </servlet> <servlet-mapping> <servlet-name>userinfoServlet</servlet-name> <url-pattern>/userinfo</url-pattern> </servlet-mapping>
8.建立一个确认订单信息的jsp页面，把session存储的东西进行展示：
<%@page import="session.UserInfo"%>
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
<h3>请确认购买信息</h3>
<% UserInfo user=(UserInfo)session.getAttribute("name");
String [] books=(String[])session.getAttribute("book");
%>
<form action="">
<table border="1" cellpadding="10" cellspacing="0">
<tr>
<td colspan="2" align="center">收货信息</td>
</tr>
<tr>
<td>收货人：</td>
<td><input type="text" name="name" value="<%=user.getName()%>" /></td>
</tr>
<tr>
<td>收货地址：</td>
<td><input type="text" name="address" value="<%=user.getAddress() %>" /></td>
</tr>
<tr>
<td>联系电话：</td>
<td><input type="text" name="phone" value="<%=user.getPhone() %>" /></td>
</tr>
<tr>
<td colspan="2" align="center">支付信息</td>
</tr>
<tr>
<td>支付类别：</td>
<td><input name="type" value="<%=user.getType() %>" />
</td>
</tr>
<tr>
<td>账号：</td>
<td><input type="text" name="account" value="<%=user.getAccount() %>" /></td>
</tr>
<tr>
<td colspan="2" align="center">商品信息</td>
</tr>
<tr>
<td>
<%for(String book:books){
out.println(book);
out.println("<br>");
}
%>
</td>
</tr>
<tr>
<td colspan="2"><input type="submit" value="确认" /></td>
</tr>
</table>
</form>
</body>
</html>需要注意的是：form表单提交时，要用绝对路径，还有servlet重定向时，也要用绝对路径，如：
1、
response.sendRedirect(request.getContextPath()+"/sessionByShoppingCart/userinfo.jsp");
2、
<form action="<%=request.getContextPath()%>/userinfo" method="post">
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