http://jexp.ru/index.php?action=history&feed=atom&title=Java%2FJSP%2FErrors
Java/JSP/Errors - История изменений
2026-04-07T14:05:29Z
История изменений этой страницы в вики
MediaWiki 1.30.0
http://jexp.ru/index.php?title=Java/JSP/Errors&diff=8699&oldid=prev
Admin: 1 версия
2010-06-01T07:10:43Z
<p>1 версия</p>
<table class="diff diff-contentalign-left" data-mw="interface">
<tr style="vertical-align: top;" lang="ru">
<td colspan="1" style="background-color: white; color:black; text-align: center;">← Предыдущая</td>
<td colspan="1" style="background-color: white; color:black; text-align: center;">Версия 07:10, 1 июня 2010</td>
</tr><tr><td colspan="2" style="text-align: center;" lang="ru"><div class="mw-diff-empty">(нет различий)</div>
</td></tr></table>
Admin
http://jexp.ru/index.php?title=Java/JSP/Errors&diff=8698&oldid=prev
в 18:01, 31 мая 2010
2010-05-31T18:01:47Z
<p></p>
<p><b>Новая страница</b></p><div>== Advanced Dynamic Web Content Generation: form error check ==<br />
<br />
<br />
<br />
<br />
<br />
<br />
<br />
<!-- start source code --><br />
<br />
<source lang="java"><br />
/*<br />
Beginning JavaServer Pages<br />
Vivek Chopra, Jon Eaves, Rupert Jones, Sing Li, John T. Bell<br />
ISBN: 0-7645-7485-X<br />
*/<br />
<br />
<br />
</source><br />
<br />
<br />
<!-- end source code --><br />
<br />
<br />
<br />
<br />
<br />
<br />
== Building a simple error handling page ==<br />
<br />
<br />
<br />
<br />
<br />
<br />
<br />
<!-- start source code --><br />
<br />
<source lang="java"><br />
<HTML><br />
<HEAD><br />
<TITLE>Building a simple error handling page.</TITLE><br />
</HEAD><br />
<BODY><br />
<%<br />
try{<br />
int value = 1;<br />
value = value / 0;<br />
}<br />
catch (Exception e){<br />
System.out.println(e.getMessage());<br />
}<br />
%><br />
</BODY><br />
</HTML><br />
<br />
</source><br />
<br />
<br />
<!-- end source code --><br />
<br />
<br />
<br />
<br />
<br />
== Deal with the errors ==<br />
<br />
<br />
<br />
<br />
<br />
<br />
<br />
<!-- start source code --><br />
<br />
<source lang="java"><br />
// generateError.jsp<br />
<%@ page errorPage="processError.jsp" %> <br />
<%-- Declare the page to send errors to --%><br />
<%-- After clicking the button, it will call itself again the generate error --%><br />
<br />
<%-- This scriptlet checks a hidden field to see whether or not to throw an exception --%><br />
<%<br />
String hiddenField = request.getParameter("hiddenValue");<br />
if ( hiddenField.equals("error"))<br />
throw new java.lang.NullPointerException();<br />
<br />
<br />
%><br />
<HTML><br />
<HEAD><TITLE>Generate Error</TITLE></HEAD><br />
<BODY><br />
This page generates an error when you click the button.<P><br />
<FORM METHOD="POST" ACTION="generateError.jsp"><br />
<INPUT TYPE="HIDDEN" NAME="hiddenValue" VALUE="error"><br />
<INPUT TYPE="SUBMIT" VALUE="Generate exception!"><br />
</FORM><br />
</BODY><br />
</HTML><br />
//Another JSP file: processError.jsp<br />
<%@ page isErrorPage="true" %><br />
<HTML><br />
<HEAD><TITLE> Process Error</TITLE></HEAD><br />
<BODY><br />
<% if ( exception != null ) {<br />
out.write("\nAn error occurred. This page is to tell you what you did wrong.\n");<br />
}<br />
else {<br />
out.write("\nYou have reached this page, but no error information is available.\n");<br />
}<br />
%><br />
</BODY><br />
</HTML><br />
<br />
<br />
</source><br />
<br />
<br />
<!-- end source code --><br />
<br />
<br />
<br />
<br />
<br />
== Error Handling: compile error in JSP page ==<br />
<br />
<br />
<br />
<br />
<br />
<br />
<br />
<!-- start source code --><br />
<br />
<source lang="java"><br />
/*<br />
Beginning JavaServer Pages<br />
Vivek Chopra, Jon Eaves, Rupert Jones, Sing Li, John T. Bell<br />
ISBN: 0-7645-7485-X<br />
*/<br />
<br />
<html><br />
<head><br />
<title>Error in Scripting Element</title><br />
</head><br />
<body><br />
<h1>Page with error in scripting element</h1><br />
<%<br />
int sum= 0;<br />
for { int i=0; i<50; i++ }<br />
sum = sum + i;<br />
%><br />
</body><br />
</html><br />
<br />
<br />
</source><br />
<br />
<br />
<!-- end source code --><br />
<br />
<br />
<br />
<br />
<br />
<br />
== Error without handler ==<br />
<br />
<br />
<br />
<br />
<br />
<br />
<br />
<!-- start source code --><br />
<br />
<source lang="java"><br />
//File Name: generateErrorNoHandler.jsp<br />
<%-- This scriptlet checks a hidden field to see whether or not to throw an exception --%><br />
<%<br />
String hiddenField = request.getParameter("hiddenValue");<br />
if ( hiddenField.equals("error"))<br />
throw new java.lang.NullPointerException();<br />
%><br />
<HTML><br />
<HEAD><TITLE>Generate Error</TITLE></HEAD><br />
<BODY><br />
This page generates an error when you click the button.<P><br />
<FORM METHOD="POST" ACTION="generateErrorNoHandler.jsp"><br />
<INPUT TYPE="HIDDEN" NAME="hiddenValue" VALUE="error"><br />
<INPUT TYPE="SUBMIT" VALUE="Generate exception!"><br />
</FORM><br />
</BODY><br />
</HTML><br />
<br />
<br />
</source><br />
<br />
<br />
<!-- end source code --><br />
<br />
<br />
<br />
<br />
<br />
== Jsp Error Bean ==<br />
<br />
<br />
<br />
<br />
<br />
<br />
<br />
<br />
== JSP error detected ==<br />
<br />
<br />
<br />
<br />
<br />
<br />
<br />
<!-- start source code --><br />
<br />
<source lang="java"><br />
/*<br />
Beginning JavaServer Pages<br />
Vivek Chopra, Jon Eaves, Rupert Jones, Sing Li, John T. Bell<br />
ISBN: 0-7645-7485-X<br />
*/<br />
<br />
<br />
</source><br />
<br />
<br />
<!-- end source code --><br />
<br />
<br />
<br />
<br />
<br />
<br />
== JSP Error handler ==<br />
<br />
<br />
<br />
<br />
<br />
<br />
<br />
<!-- start source code --><br />
<br />
<source lang="java"><br />
<%@page isErrorPage="true" %><br />
<%@ taglib uri="http://java.sun.ru/jstl/core" prefix="c" %><br />
<html><br />
<head><title>Sorry about the error</title></head><br />
<body><br />
<h2>Sorry, We Erred Handling Your Request</h2><br />
<strong>Here is information about the error:</strong> <br><br><br />
The servlet name associated with throwing the exception: <br />
<%-- JSP 2.0 usage only! <br />
<c:out value="${pageContext.errorData.servletName}" /> --%><br />
<br><br><br />
The type of exception: <c:out value=<br />
"${requestScope[<br />
\"javax.servlet.jsp.jspException\"].class.name}" /><br />
<br><br><br />
The request URI:<br />
<%-- JSP 2.0 usage only! <br />
<c:out value="${pageContext.errorData.requestURI}" /> --%><br />
<br><br><br />
The exception message: <br />
<c:out value="${pageContext.exception.message}" /><br />
</body><br />
</html><br />
<br />
<br />
</source><br />
<br />
<br />
<!-- end source code --><br />
<br />
<br />
<br />
<br />
<br />
== JSP error: no such page ==<br />
<br />
<br />
<br />
<br />
<br />
<br />
<br />
<!-- start source code --><br />
<br />
<source lang="java"><br />
/*<br />
Beginning JavaServer Pages<br />
Vivek Chopra, Jon Eaves, Rupert Jones, Sing Li, John T. Bell<br />
ISBN: 0-7645-7485-X<br />
*/<br />
<br />
<br />
</source><br />
<br />
<br />
<!-- end source code --><br />
<br />
<br />
<br />
<br />
<br />
<br />
== Page with error in JSP directive and actions ==<br />
<br />
<br />
<br />
<br />
<br />
<br />
<br />
<!-- start source code --><br />
<br />
<source lang="java"><br />
/*<br />
Beginning JavaServer Pages<br />
Vivek Chopra, Jon Eaves, Rupert Jones, Sing Li, John T. Bell<br />
ISBN: 0-7645-7485-X<br />
*/<br />
<br />
<br />
</source><br />
<br />
<br />
<!-- end source code --><br />
<br />
<br />
<br />
<br />
<br />
<br />
== Simple error testing ==<br />
<br />
<br />
<br />
<br />
<br />
<br />
<br />
<!-- start source code --><br />
<br />
<source lang="java"><br />
//File: index.jsp<br />
<%@ page errorPage="errPage.jsp" %><br />
<HTML><br />
<HEAD><TITLE> Simple error testing </TITLE></HEAD><br />
<BODY><br />
<%! <br />
String nullString = null;<br />
%><br />
<%-- Intentionally invoking a NullPointerException --%><br />
The length of the nullString is <%= nullString.length() %><br />
</BODY><br />
</HTML><br />
/////////////////////////////////////////////////////<br />
//File: errPage.jsp<br />
<%@ page isErrorPage="true" %><br />
Uncaught exception <%= exception %> has been encountered!<br />
<br />
</source><br />
<br />
<br />
<!-- end source code --><br />
<br />
<br />
<br />
<br />
<br />
<br />
== Using an Error Page Jsp ==<br />
<br />
<br />
<br />
<br />
<br />
<br />
<br />
<!-- start source code --><br />
<br />
<source lang="java"><br />
//File: index.jsp<br />
<%@ page errorPage="errorPage.jsp" %><br />
<HTML><br />
<HEAD><br />
<TITLE>Using an Error Page</TITLE><br />
</HEAD><br />
<BODY><br />
<H1>Using an Error Page</H1><br />
<%<br />
int value = 1;<br />
value = value / 0;<br />
%><br />
</BODY><br />
</HTML><br />
<br />
//File: errorPage.jsp<br />
<%@ page isErrorPage="true" %><br />
<HTML><br />
<HEAD><br />
<TITLE>An Error Page</TITLE><br />
</HEAD><br />
<BODY><br />
<H1>An Error Page</H1><br />
There was an error! Don"t Panic!!!<br />
<BR><br />
Consult your physician immediately.<br />
</BODY><br />
</HTML><br />
<br />
<br />
</source><br />
<br />
<br />
<!-- end source code --><br />
<br />
<br />
<br />
<br />
<br />
<br />
== Using the Exception Object in Jsp ==</div>