javaWeb的session实现购物车案例

其他 2018-07-26 05:10:05 阅读次数: 0


- 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>
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- 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");
    }

}
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- 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>
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  • 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>
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  • 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");


    }

}
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  • 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(){}



}
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  • 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>
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  • 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>
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注意：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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