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发表时间：2011-02-13
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%> <%
String username=request.getParameter("username").trim(); if(username.equals("dongdong")){ out.print("failure"); }else { out.print("success");} %> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <title>My JSP 'index.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"> <!-- <link rel="stylesheet" type="text/css" href="styles.css"> --> <script language="javascript" type="text/javascript"> function createRequest(){ var xmlHttp=false; if(window.XMLHttpRequest){ xmlHttp=new XMLHttpRequest(); }if else (window.ActiveXObject) { try{ xmlHttp=new ActiveXObject("Msxml2.XMLHttpRequest"); } catch (error1){ try{ xmlHttp=new ActiveXObject("Microsoft.XMLHTTP"); } catch (error2){ xmlHttp=false; } } } return xmlHttp;} function checkUsername(username){ var checkRet = document.fetElementById("checkRet"); check.innerHTML="稍后...."; var xmlHttp=createRequest(); var url="index.jsp?username="+username; xmlHttp.open("get",url); xmlHttp.onreadystatechange=function(){ if(xmlHttp.readyState==4){ if(xmlHttp.status==200) if(xmlHttp.responseText=="success"){ checkRet.innerHTML="this username is not usered"; }else if(xmlHttp.responseText="failure"){ checkRet.innerHTML="this username is usering"; } </script> </head> <body> <form id="form1" name="form1" method="post" action=""> <label> username: <input type="text" name="username" onblur="checkUsername(this.value)" /> <div id="checkRet"></div> </label> <br /> </form> </body> </html> org.apache.jasper.JasperException: An exception occurred processing JSP page /index.jsp at line 2 1: <%@ page language="java" import="java.util.*" pageEncoding="utf-8"%> <% 2: String username=request.getParameter("username").trim(); 3: if(username.equals("dongdong")){ out.print("failure"); }else { 4: out.print("success");} %> 5: Stacktrace: org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:524) org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:435) org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:320) org.apache.jasper.servlet.JspServlet.service(JspServlet.java:266) javax.servlet.http.HttpServlet.service(HttpServlet.java:803) root cause java.lang.NullPointerException org.apache.jsp.index_jsp._jspService(index_jsp.java:56) org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70) javax.servlet.http.HttpServlet.service(HttpServlet.java:803) org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:393) org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:320) org.apache.jasper.servlet.JspServlet.service(JspServlet.java:266) javax.servlet.http.HttpServlet.service(HttpServlet.java:803) 到底哪里的问题 谢谢大家 声明：ITeye文章版权属于作者，受法律保护。没有作者书面许可不得转载。
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