String intime=request.getParameter("d11");//从文本框中获得的日期，这是从
my97Date控件中获得的值，一开始时为空，点击查询按钮后才会有值
String intime3=intime.substring(5, 8);
出现下列错误：
type Exception report
message An exception occurred processing JSP page /ShowRoom2.jsp at line 80
description The server encountered an internal error that prevented it from fulfilling this request.
exception
org.apache.jasper.JasperException: An exception occurred processing JSP page /ShowRoom2.jsp at line 80
77:
78: <%
79: String intime=request.getParameter("d11");
80: String intime3=intime.substring(5, 8);
81: //if(substring(intime,1,4))
82: //if(intime.substring(0, 4).equals("6"))
83: out.println("杞寲鐨勬椂闂达細"+intime3);
Stacktrace:
org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:568)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:470)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:390)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334)
javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
root cause
java.lang.NullPointerException
org.apache.jsp.ShowRoom2_jsp._jspService(ShowRoom2_jsp.java:153)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:432)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:390)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334)
javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
note The full stack trace of the root cause is available in the Apache Tomcat/7.0.52 logs.
我自己分析了一下原因是第80行出现了空指针，但是我的intime是有值的（“2015-06-15”），就是使用substring报错
有人知道怎么回事吗？
