本文介绍如何在web.xml中配置404和500错误页面，并展示了如何使用JSP实现自定义错误页面。
web.xml
1
<?xml version="1.0" encoding="UTF-8"?>
2<web-app version="2.4"
3 xmlns="http://java.sun.com/xml/ns/j2ee"
4 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
5 xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee
6 http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
7
8<error-page>
9 <error-code>404</error-code>
10 <location>/building.jsp</location>
11</error-page>
12
13<error-page>
14 <error-code>500</error-code>
15 <location>/error.jsp</location>
16</error-page>
17
18</web-app>
19
JSP页面的关键在于
1 isErrorPage="true"
2 response.setStatus(HttpServletResponse.SC_OK);
building.jsp
1<%@ page language="java" contentType="text/html; charset=GBK" isErrorPage="true" pageEncoding="GBK"%>
2<%response.setStatus(HttpServletResponse.SC_OK);%>
3<%
4
/** *//**
5
* 本页面是在客户查找的页面无法找到的情况下调用的
6
*/
7response.setStatus(HttpServletResponse.SC_OK);
8%>
9<body>
10正在制作
<a href="javascript:history.go(-1)">返回</a>
11<br/>
12也可能页面连接更改了，请按 F5 键刷新整个页面看看，特别是菜单！
13</body>
error.jsp
1<%@ page language="java" contentType="text/html; charset=GBK" isErrorPage="true" pageEncoding="GBK"%>
2<%@ page import="java.io.*,java.util.*"%>
3<%response.setStatus(HttpServletResponse.SC_OK);%>
4<body>
5程序发生了错误，有可能该页面正在调试或者是设计上的缺陷.<br/>
6你可以选择<br/> <a href=<%=request.getContextPath()+"/forum/new.jsp" %>>反馈</a>
7提醒我
或者<br/><a href="javascript:history.go(-1)">返回上一页</a>
8<hr width=80%>
9<h2><font color=#DB1260>JSP Error Page</font></h2>
10<p>An exception was thrown: <b> <%=exception.getClass()%>:<%=exception.getMessage()%></b></p>
11<%
12Enumeration<String> e = request.getHeaderNames();
13String key;
14
while(e.hasMoreElements())
{
15 key = e.nextElement();
16}
17e = request.getAttributeNames();
18
while(e.hasMoreElements())
{
19 key = e.nextElement();
20}
21e = request.getParameterNames();
22
while(e.hasMoreElements())
{
23 key = e.nextElement();
24}
25%>
26<%=request.getAttribute("javax.servlet.forward.request_uri") %><br>
27<%=request.getAttribute("javax.servlet.forward.servlet_path") %>
28<p>With the following stack trace:</p>
29<pre>
30<%
31 exception.printStackTrace();
32 ByteArrayOutputStream ostr = new ByteArrayOutputStream();
33 exception.printStackTrace(new PrintStream(ostr));
34 out.print(ostr);
35%>
36</pre>
37<hr width=80%>
38</body>
1
<?xml version="1.0" encoding="UTF-8"?>
2
<web-app version="2.4"
3
xmlns="http://java.sun.com/xml/ns/j2ee"
4
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
5
xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee
6
http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
7
8
<error-page>
9
<error-code>404</error-code>
10
<location>/building.jsp</location>
11
</error-page>
12
13
<error-page>
14
<error-code>500</error-code>
15
<location>/error.jsp</location>
16
</error-page>
17
18
</web-app>
19
JSP页面的关键在于
1 isErrorPage="true"
2 response.setStatus(HttpServletResponse.SC_OK);
building.jsp
1
<%@ page language="java" contentType="text/html; charset=GBK" isErrorPage="true" pageEncoding="GBK"%>
2
<%response.setStatus(HttpServletResponse.SC_OK);%>
3
<%
4
/** *//**
5
* 本页面是在客户查找的页面无法找到的情况下调用的
6
*/
7
response.setStatus(HttpServletResponse.SC_OK);
8
%>
9
<body>
10
正在制作
<a href="javascript:history.go(-1)">返回</a>
11
<br/>
12
也可能页面连接更改了，请按 F5 键刷新整个页面看看，特别是菜单！
13
</body>
error.jsp
1
<%@ page language="java" contentType="text/html; charset=GBK" isErrorPage="true" pageEncoding="GBK"%>
2
<%@ page import="java.io.*,java.util.*"%>
3
<%response.setStatus(HttpServletResponse.SC_OK);%>
4
<body>
5
程序发生了错误，有可能该页面正在调试或者是设计上的缺陷.<br/>
6
你可以选择<br/> <a href=<%=request.getContextPath()+"/forum/new.jsp" %>>反馈</a>
7
提醒我
或者<br/><a href="javascript:history.go(-1)">返回上一页</a>
8
<hr width=80%>
9
<h2><font color=#DB1260>JSP Error Page</font></h2>
10
<p>An exception was thrown: <b> <%=exception.getClass()%>:<%=exception.getMessage()%></b></p>
11
<%
12
Enumeration<String> e = request.getHeaderNames();
13
String key;
14
while(e.hasMoreElements())
{
15
key = e.nextElement();
16
}
17
e = request.getAttributeNames();
18
while(e.hasMoreElements())
{
19
key = e.nextElement();
20
}
21
e = request.getParameterNames();
22
while(e.hasMoreElements())
{
23
key = e.nextElement();
24
}
25
%>
26
<%=request.getAttribute("javax.servlet.forward.request_uri") %><br>
27
<%=request.getAttribute("javax.servlet.forward.servlet_path") %>
28
<p>With the following stack trace:</p>
29
<pre>
30
<%
31
exception.printStackTrace();
32
ByteArrayOutputStream ostr = new ByteArrayOutputStream();
33
exception.printStackTrace(new PrintStream(ostr));
34
out.print(ostr);
35
%>
36
</pre>
37
<hr width=80%>
38
</body>
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