这是什么错误啊 求大神解决！
type Exception report
message
description The server encountered an internal error () that prevented it from fulfilling this request.
exception
org.apache.jasper.JasperException: For input string: ""
org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:500)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:413)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:308)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:259)
javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
org.apache.struts.action.RequestProcessor.doForward(RequestProcessor.java:1069)
org.apache.struts.action.RequestProcessor.processForwardConfig(RequestProcessor.java:455)
org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:279)
org.apache.struts.action.ActionServlet.process(ActionServlet.java:1482)
org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:507)
javax.servlet.http.HttpServlet.service(HttpServlet.java:627)
javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
com.lbs.leaf.sysmanage.webcontroller.OperateLogFilter.doFilter(OperateLogFilter.java:87)
com.lbs.leaf.sysmanage.webcontroller.SafetyFilter.doFilter(SafetyFilter.java:239)
com.lbs.leaf.persistence.HibernateFilter.doFilter(Unknown Source)
com.lbs.leaf.webcontroller.DisableHttpCacheFilter.doFilter(Unknown Source)
com.lbs.leaf.webcontroller.EncodingFilter.doFilter(Unknown Source)
root cause
java.lang.NumberFormatException: For input string: ""
java.lang.NumberFormatException.forInputString(NumberFormatException.java:48)
java.lang.Integer.parseInt(Integer.java:468)
java.lang.Integer.parseInt(Integer.java:497)
org.apache.jsp.topFunc_jsp._jspService(topFunc_jsp.java:92)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:98)
javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:371)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:308)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:259)
javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
org.apache.struts.action.RequestProcessor.doForward(RequestProcessor.java:1069)
org.apache.struts.action.RequestProcessor.processForwardConfig(RequestProcessor.java:455)
org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:279)
org.apache.struts.action.ActionServlet.process(ActionServlet.java:1482)
org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:507)
javax.servlet.http.HttpServlet.service(HttpServlet.java:627)
javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
com.lbs.leaf.sysmanage.webcontroller.OperateLogFilter.doFilter(OperateLogFilter.java:87)
com.lbs.leaf.sysmanage.webcontroller.SafetyFilter.doFilter(SafetyFilter.java:239)
com.lbs.leaf.persistence.HibernateFilter.doFilter(Unknown Source)
com.lbs.leaf.webcontroller.DisableHttpCacheFilter.doFilter(Unknown Source)
com.lbs.leaf.webcontroller.EncodingFilter.doFilter(Unknown Source)
note The full stack trace of the root cause is available in the Apache Tomcat/5.5.36 logs.
--------------------------------------------
Apache Tomcat/5.5.36
[解决办法]
转换一个非数值型字符串为数值，貌似是空啊
[解决办法]
你获得的string是空啊 不能完成你要做的操作。
你得到了string后，先判断null或者是""，然后你再去操作
