首頁猿問 jsp報錯，大家看看

jsp報錯，大家看看

Java

qq_晝綻_0 2016-08-30 11:35:16

<%@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"> ? </head><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>目錄 </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)%>">加入購物車</a>? ? ? ? ? ? </td>? ? ? ? </tr>? ? ? ? <%? ? ? ??? ? ? ? }? ? ? ? %>? ? </table>? ? <a href="prevPage.jsp" >上一頁</a>? ? <a href="nextPage.jsp" >下一頁</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，不知道哪里明明沒問題啊? ? ? ? %>? ? <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>錯誤內(nèi)容：嚴(yán)重: Servlet.service() for servlet [jsp] in context with path [/WebPractice1] threw exception [An exception occurred processing JSP page /book.jsp at line 108105: ? ? 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 causejava.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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黑女2008

TA貢獻(xiàn)75條經(jīng)驗(yàn) 獲得超32個贊

初步懷疑你String[] list =temp_list.split(",");獲取到的數(shù)組并非都可以轉(zhuǎn)化成int

反對回復(fù) 2016-08-30

qq_晝綻_0
不是這個問題吧，我直接打開這個頁面，還沒有參數(shù)進(jìn)來

回復(fù) 2016-08-30
黑女2008
for(String s:list){直接打印這里的s看下}

回復(fù) 2016-08-30
qq_晝綻_0
我已經(jīng)解決了， temp_list=temp_list+request.getParameter("id")+","; id這個id我沒寫，傳進(jìn)來為"",但進(jìn)行這個拼接語句后，temp_list就成了"null"。

回復(fù) 2016-08-30