Package org.opennms.web.servlet
Class AddRefreshHeaderFilter
- java.lang.Object
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- org.opennms.web.servlet.AddRefreshHeaderFilter
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- All Implemented Interfaces:
javax.servlet.Filter
public class AddRefreshHeaderFilter extends java.lang.Object implements javax.servlet.Filter
A filter that adds an HTTP Refresh header to a servlet or JSP's response. The amount of time to wait before refresh is configurable.- Since:
- 1.8.1
- Author:
- Lawrence Karnowski , OpenNMS
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Field Summary
Fields Modifier and Type Field Description protected javax.servlet.FilterConfig
filterConfig
protected java.lang.String
seconds
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Constructor Summary
Constructors Constructor Description AddRefreshHeaderFilter()
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description void
destroy()
destroyvoid
doFilter(javax.servlet.ServletRequest request, javax.servlet.ServletResponse response, javax.servlet.FilterChain chain)
Adds a Refresh HTTP header before processing the request.void
init(javax.servlet.FilterConfig config)
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Method Detail
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doFilter
public void doFilter(javax.servlet.ServletRequest request, javax.servlet.ServletResponse response, javax.servlet.FilterChain chain) throws java.io.IOException, javax.servlet.ServletException
Adds a Refresh HTTP header before processing the request.This is a strange implementation, because intuitively, you would add the header after the content has been produced (in other words, after you had already called
FilterChain.doFilter
. However, the Servlet 2.3 spec (proposed final draft) states (albeit in an off-handed fashion) that you can only "examine" the response headers after thedoFilter
call. Evidently this means that you cannot change the headers after thedoFilter
. If you callsetHeader
nothing happens.- Specified by:
doFilter
in interfacejavax.servlet.Filter
- Throws:
java.io.IOException
javax.servlet.ServletException
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init
public void init(javax.servlet.FilterConfig config)
- Specified by:
init
in interfacejavax.servlet.Filter
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destroy
public void destroy()
destroy
- Specified by:
destroy
in interfacejavax.servlet.Filter
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