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来源：3-7 request对象（上）

柴犬的凝视

2018-08-08 16:11

<%@ page language="java" import="java.util.*" contentType="text/html; charset=utf-8"%>

<!DOCTYPE html>

<html>

<head>

<title>Insert title here</title>

</head>

<body>

<hr>

<table>

<tr>

</tr>

<tr>

<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>

</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>

<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]+"&nbsp;&nbsp;");
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.

写回答关注

4回答

我是无知怎么了

2018-08-16 17:32:04

出现错误就看报错描述：The origin server did not find a current representation for the target resource or is not willing to disclose that one exists.
原始服务器没有找到目标资源的当前表示形式，或者不愿意公开它的存在。
reg.jsp的内容都在form表单中，当执行reg.jsp时，就会向服务器请求跳转action所写的jsp页面：request.jsp，执行request.jsp内容
你的错误是action跳转的页面不存在，或者不愿意被访问
为低级的拼写错误。

0 1
慕粉0915589117

2018-08-14 12:20:48

<form name="regForm" action="request.jsp" method="post">

0 0
慕神4225693

2018-08-09 17:31:48

你的 form表单的action属性写成了 action=“rqeuest.jsp”

0 0
LeanOn3629322

2018-08-08 17:49:15

<form name="regForm" action="rqeuest.jsp" method="post">

看是不是文件名打错了 404找不到文件

0 0