点击注册后跳转404
<%@ page language="java" import="java.util.*" contentType="text/html; charset=utf-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Insert title here</title>
</head>
<body>
<h1>用户注册</h1>
<hr>
<form name="regForm" action="rqeuest.jsp" method="post">
<table>
<tr>
<td>用户名：</td>
<td><input type="text" name="username"/></td>
</tr>
<tr>
<td>爱好：</td>
<td>
<input type="checkbox" name="favorite" value="read">读书
<input type="checkbox" name="favorite" value="music">音乐
<input type="checkbox" name="favorite" value="movie">电影
<input type="checkbox" name="favorite" value="internet">上网
</td>
</tr>
<tr>
<td colspan="2"><input type="submit" value="提交"/></td>
</tr>
</table>
</form>
</body>
</html>
错误页面
Type Status Report
Message /MyJavaWebApp/rqeuest.jsp
Description The origin server did not find a current representation for the target resource or is not willing to disclose that one exists.
request.jsp代码
<%@ page language="java" import="java.util.*" contentType="text/html; charset=utf-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Insert title here</title>
</head>
<body>
<h1>request内置对象</h1>
用户名：<%=request.getParameter("username") %><br>
爱好：<%
String[] favorites = request.getParameterValues("favorite");
for(int i=0;i<favorites.length;i++)
{
out.println(favorites[i]+" ");
}
%>
</body>
</html>
运行后页面500错误
Type Exception Report
Message An exception occurred processing JSP page /request.jsp at line 13
Description The server encountered an unexpected condition that prevented it from fulfilling the request.
Exception
org.apache.jasper.JasperException: An exception occurred processing JSP page /request.jsp at line 13
10: 用户名：<%=request.getParameter("username") %><br>
11: 爱好：<%
12: String[] favorites = request.getParameterValues("favorite");
13: for(int i=0;i<favorites.length;i++)
14: {
15: out.println(favorites[i]+" ");
16: }
Stacktrace:
org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:580)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:477)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:395)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:339)
javax.servlet.http.HttpServlet.service(HttpServlet.java:731)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)Root Cause
java.lang.NullPointerException org.apache.jsp.request_jsp._jspService(request_jsp.java:98) org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70) javax.servlet.http.HttpServlet.service(HttpServlet.java:731) org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:439) org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:395) org.apache.jasper.servlet.JspServlet.service(JspServlet.java:339) javax.servlet.http.HttpServlet.service(HttpServlet.java:731) org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
Note The full stack trace of the root cause is available in the server logs.
