<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<title>My JSP 'buy.jsp' starting page</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
--> </head>
<body>
<%
String id=request.getParameter("id");
if(id!=null&&!"".equals(id)){
String saveName="id"+id;
Integer books=0;
Object obj1=session.getAttribute(saveName);
if(obj1!=null){
books=(Integer)obj1;
}
books++;
System.out.println(saveName);
System.out.println(books);
session.setAttribute(saveName,books);
}
response.sendRedirect("buyCar.jsp");
%>
</body>
</html> String saveName="id"+id;
Integer books=0;
Object obj1=session.getAttribute(saveName);
if(obj1!=null){
books=(Integer)obj1;
}
这段什么意思?
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<title>My JSP 'buy.jsp' starting page</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
--> </head>
<body>
<%
String id=request.getParameter("id");
if(id!=null&&!"".equals(id)){
String saveName="id"+id;
Integer books=0;
Object obj1=session.getAttribute(saveName);
if(obj1!=null){
books=(Integer)obj1;
}
books++;
System.out.println(saveName);
System.out.println(books);
session.setAttribute(saveName,books);
}
response.sendRedirect("buyCar.jsp");
%>
</body>
</html> String saveName="id"+id;
Integer books=0;
Object obj1=session.getAttribute(saveName);
if(obj1!=null){
books=(Integer)obj1;
}
这段什么意思?
解决方案 »
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是获取session的值,前面没有设置session.setAttribute()的值;
怎么获取啊?
这不就是吗: books++;
System.out.println(saveName);
System.out.println(books);
session.setAttribute(saveName,books);
}
String id=request.getParameter("id");
if(id!=null&&!"".equals(id)){
String saveName="id"+id;
Integer books=0;
Object obj1=session.getAttribute(saveName);
if(obj1!=null){
books=(Integer)obj1;
}
然后才跳到下面
books++;
System.out.println(saveName);
System.out.println(books);
session.setAttribute(saveName,books);
}执行吧