web工程login时提示空指针错误，如何解决
日期：2014-05-17 浏览次数：20666 次
web工程login时提示空指针异常，怎么解决
异常信息：严重: Servlet.service() for servlet jsp threw exception
java.lang.NullPointerException
at org.apache.jsp.check_jsp._jspService(check_jsp.java:72)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:388)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:313)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:260)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:293)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:859)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:602)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
at java.lang.Thread.run(Thread.java:619)
2012-4-29 10:59:08 org.apache.catalina.core.StandardWrapperValve invoke
下面的是源码：
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!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=UTF-8">
<title>验证页面</title>
</head>
<body>
<%
String name=(String)request.getParameter("username");
String password=(String)request.getParameter("password");
String repassword=(String)request.getParameter("repassword");
String sex=(String)request.getParameter("sex");
String work=(String)request.getParameter("work");
String[] love=(String[])request.getParameterValues("love");
String show=(String)request.getParameter("show");
/*将复选框得到的数组的值取出*/
String strLove= "";
for(int i=0;i<love.length;i++)
{
if(strLove.trim().equals(""))
{
strLove=strLove+"'"+love[i].toString()+"'";
}
else
{
strLove=strLove+","+love[i].toString()+"'";
}
}
if(strLove.trim().substring(0,strLove.trim().length()).equals(","))
{
strLove=strLove.trim().substring(0,strLove.trim().length()-1);
}
%>
<!-- 使用font标签控制字体的大小和颜色 -->
<font size="4" color="blue">您的注册信息是</font><br>
<!-- 将得到的相关信息显示在网页上 -->
&
异常信息：严重: Servlet.service() for servlet jsp threw exception
java.lang.NullPointerException
at org.apache.jsp.check_jsp._jspService(check_jsp.java:72)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:388)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:313)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:260)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:293)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:859)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:602)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
at java.lang.Thread.run(Thread.java:619)
2012-4-29 10:59:08 org.apache.catalina.core.StandardWrapperValve invoke
下面的是源码：
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!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=UTF-8">
<title>验证页面</title>
</head>
<body>
<%
String name=(String)request.getParameter("username");
String password=(String)request.getParameter("password");
String repassword=(String)request.getParameter("repassword");
String sex=(String)request.getParameter("sex");
String work=(String)request.getParameter("work");
String[] love=(String[])request.getParameterValues("love");
String show=(String)request.getParameter("show");
/*将复选框得到的数组的值取出*/
String strLove= "";
for(int i=0;i<love.length;i++)
{
if(strLove.trim().equals(""))
{
strLove=strLove+"'"+love[i].toString()+"'";
}
else
{
strLove=strLove+","+love[i].toString()+"'";
}
}
if(strLove.trim().substring(0,strLove.trim().length()).equals(","))
{
strLove=strLove.trim().substring(0,strLove.trim().length()-1);
}
%>
<!-- 使用font标签控制字体的大小和颜色 -->
<font size="4" color="blue">您的注册信息是</font><br>
<!-- 将得到的相关信息显示在网页上 -->
&
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