我有段代码如下:有问题,就是不知道怎么错的
<%@ page contentType="text/html; charset=gb2312" language="java" import="java.sql.*,java.util.Date" errorPage="../error.jsp"%>
<%
int ActivityID =0;
String getActivityID=new String(request.getParameter("ActivityID"));
%>
<!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=gb2312">
<title>无标题文档</title>
</head>
<body>
<input name="ActivityID" type="hidden" value=<%=ActivityID%>>
</body>
</html>
我就是想用getActivityID=new String(request.getParameter("ActivityID"));调用本页面中的表单中的<input name="ActivityID" type="hidden" value=<%=ActivityID%>>的值。但是运行时报错。这样写有问题吗?
<%@ page contentType="text/html; charset=gb2312" language="java" import="java.sql.*,java.util.Date" errorPage="../error.jsp"%>
<%
int ActivityID =0;
String getActivityID=new String(request.getParameter("ActivityID"));
%>
<!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=gb2312">
<title>无标题文档</title>
</head>
<body>
<input name="ActivityID" type="hidden" value=<%=ActivityID%>>
</body>
</html>
我就是想用getActivityID=new String(request.getParameter("ActivityID"));调用本页面中的表单中的<input name="ActivityID" type="hidden" value=<%=ActivityID%>>的值。但是运行时报错。这样写有问题吗?
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java.lang.NullPointerException
错误:java.lang.NullPointerException
at java.lang.String.(String.java:141)
at org.apache.jsp.crm.Activity.Activity_005flab1_jsp._jspService(Activity_005flab1_jsp.java:142)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:94)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:324)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:237)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:157)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:214)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
at org.apache.catalina.core.StandardContextValve.invokeInternal(StandardContextValve.java:198)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:152)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:137)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:118)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:102)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:929)
at org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:160)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:799)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:705)
at org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:577)
at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:683)
at java.lang.Thread.run(Thread.java:534)帮帮忙看看啊!
上面那段代码运行一下就可以看见出错的。谢谢
<body>
<form name="saveActivity" action="saveActivity.jsp" method="post">
<input name="ActivityID" type="hidden" value=<%=ActivityID%>>
<br>
<input name="ActivityID1" type="text" value=<%=ActivityID%>>
</form>
</body>
我用ActivityUpdateDate = rs.getDate("ActivityReviseDate");
ActivityCreateDate = rs.getDate("ActivityCreateDate");就出现[Microsoft][ODBC SQL Server Driver]无效的描述符索引
的错误。
String getActivityID=new String(request.getParameter("ActivityID"));
}
是不是要加""啊
直接写成这样呢:String getActivityID=request.getParameter("ActivityID");
if( getActivityID==NULL)
getActivityID="";还有value=<%=ActivityID%>是不是要写成这样啊:value=<%= "'" + ActivityID + "'"%>,我记不清了,多改几个地方试试吧
我用ActivityUpdateDate = rs.getDate("ActivityReviseDate");
ActivityCreateDate = rs.getDate("ActivityCreateDate");就出现[Microsoft][ODBC SQL Server Driver]无效的描述符索引
的错误。用getObject或者getString试试
你是想本页面调用本页面吗?第一次出页面是没有数据的,当本页面调用本页面后,就会有数据了,你的表单没有提交的按钮submit