<%@page import="java.sql.ResultSet"%>
<%@ page language="java" import="java.util.*,com.jinxin.dao.LoginMaker" contentType="text/html; charset=utf-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<title>My JSP 'book.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>
<!-- <script type="text/javascript" src="http://libs.baidu.com/jquery/1.9.1/jquery.js"></script>
<script type="text/javascript">
window.onload=function(){
document.getElementById("prev_page").onclick=button1;
}
function button1(){
}
</scirpt>-->
<style type="text/css">
*{margin:0px;padding:0px}
#content{width:auto; margin:0 200px;text-align:center;border:1px solid #000;background:#CCC}
table{margin:0px auto 0 auto;border-top:2px solid #999;border-left:2px solid #999; }
h3{padding-left:20px;border-bottom:#FFF solid 2px;margin-top:100px}
td{border-bottom:2px solid #999;border-right:2px solid #999}
</style>
<body>
<div id="content">
<h3>目录 </h3>
<table>
<tr class="title">
<td>Id</td>
<td>Title</td>
<td>Author</td>
<td>UnitPrice</td>
</tr>
<%
if(session.getAttribute("i")==null){
session.setAttribute("i",1);
}
int i=Integer.parseInt(""+session.getAttribute("i"));
int j=8;
for(int m=0;m<j;m++){
%>
<tr>
<td><%=LoginMaker.bookSelect(i*j-(j-1)+m).getInt(1) %>
</td>
<td><%=LoginMaker.bookSelect(i*j-(j-1)+m).getString(2) %>
</td>
<td><%=LoginMaker.bookSelect(i*j-(j-1)+m).getString(3) %>
</td>
<td><%=LoginMaker.bookSelect(i*j-(j-1)+m).getDouble(8) %>
</td>
<td><a href="book.jsp?id=<%=(i*j-(j-1)+m)%>">加入购物车</a>
</td>
</tr>
<%
}
%>
</table>
<a href="prevPage.jsp" >上一页</a>
<a href="nextPage.jsp" >下一页</a>
</div>
<div>
<table>
<%
String temp_list="";
Cookie[] cookies=request.getCookies();
for(Cookie c:cookies){
if(c.getName().equals("idList")){
temp_list=c.getValue();
}
}
temp_list=temp_list+request.getParameter("id")+",";
Cookie c =new Cookie("idList",temp_list);
String[] list =temp_list.split(",");
for(String s:list){
int m =Integer.parseInt(s);//108row，不知道哪里明明没问题啊
%>
<tr>
<td><%=LoginMaker.bookSelect(m).getInt(1) %>
</td>
<td><%=LoginMaker.bookSelect(m).getString(2) %>
</td>
<td><%=LoginMaker.bookSelect(m).getString(3) %>
</td>
<td><%=LoginMaker.bookSelect(m).getDouble(8) %>
</td>
</tr>
<%
}
%>
</table>
</div>
</body>
</html>
错误内容：
严重: Servlet.service() for servlet [jsp] in context with path [/WebPractice1] threw exception [An exception occurred processing JSP page /book.jsp at line 108
105: Cookie c =new Cookie("idList",temp_list);
106: String[] list =temp_list.split(",");
107: for(String s:list){
108: int m =Integer.parseInt(s);
109:
110: %>
111: <tr>
Stacktrace:] with root cause
java.lang.NumberFormatException: For input string: "null"
at java.lang.NumberFormatException.forInputString(NumberFormatException.java:65)
at java.lang.Integer.parseInt(Integer.java:492)
at java.lang.Integer.parseInt(Integer.java:527)
at org.apache.jsp.book_jsp._jspService(book_jsp.java:210)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:731)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:439)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:395)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:339)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:731)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:218)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:505)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:169)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:956)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:442)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1082)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:623)
at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.doRun(AprEndpoint.java:2517)
at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:2506)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Thread.java:744)
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