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java.lang.Objectjavax.servlet.GenericServlet
javax.servlet.http.HttpServlet
org.apache.felix.webconsole.plugins.upnp.internal.ControlServlet
public class ControlServlet
This class handles requests from the Web Interface. It is separated from the WebConsolePlugin just to improve readability. This servlet actually is not registered in HTTP service.
Method Summary | |
---|---|
Object |
addingService(ServiceReference ref)
A service is being added to the ServiceTracker . |
protected void |
doGet(HttpServletRequest request,
HttpServletResponse response)
Called by the server (via the service method) to
allow a servlet to handle a GET request. |
protected void |
doPost(HttpServletRequest request,
HttpServletResponse response)
Called by the server (via the service method)
to allow a servlet to handle a POST request. |
void |
modifiedService(ServiceReference ref,
Object serv)
A service tracked by the ServiceTracker has been modified. |
void |
removedService(ServiceReference ref,
Object serv)
A service tracked by the ServiceTracker has been removed. |
Methods inherited from class javax.servlet.http.HttpServlet |
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doDelete, doHead, doOptions, doPut, doTrace, getLastModified, service, service |
Methods inherited from class javax.servlet.GenericServlet |
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destroy, getInitParameter, getInitParameterNames, getServletConfig, getServletContext, getServletInfo, init, init, log, log |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Method Detail |
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protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
HttpServlet
service
method) to
allow a servlet to handle a GET request.
Overriding this method to support a GET request also automatically supports an HTTP HEAD request. A HEAD request is a GET request that returns no body in the response, only the request header fields.
When overriding this method, read the request data,
write the response headers, get the response's writer or
output stream object, and finally, write the response data.
It's best to include content type and encoding. When using
a PrintWriter
object to return the response,
set the content type before accessing the
PrintWriter
object.
The servlet container must write the headers before committing the response, because in HTTP the headers must be sent before the response body.
Where possible, set the Content-Length header (with the
ServletResponse.setContentLength(int)
method),
to allow the servlet container to use a persistent connection
to return its response to the client, improving performance.
The content length is automatically set if the entire response fits
inside the response buffer.
The GET method should be safe, that is, without any side effects for which users are held responsible. For example, most form queries have no side effects. If a client request is intended to change stored data, the request should use some other HTTP method.
The GET method should also be idempotent, meaning that it can be safely repeated. Sometimes making a method safe also makes it idempotent. For example, repeating queries is both safe and idempotent, but buying a product online or modifying data is neither safe nor idempotent.
If the request is incorrectly formatted, doGet
returns an HTTP "Bad Request" message.
doGet
in class HttpServlet
request
- an HttpServletRequest
object that
contains the request the client has made
of the servletresponse
- an HttpServletResponse
object that
contains the response the servlet sends
to the client
ServletException
- if the request for the GET
could not be handled
IOException
- if an input or output error is
detected when the servlet handles
the GET requestHttpServlet.doGet(javax.servlet.http.HttpServletRequest,
javax.servlet.http.HttpServletResponse)
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
HttpServlet
service
method)
to allow a servlet to handle a POST request.
The HTTP POST method allows the client to send
data of unlimited length to the Web server a single time
and is useful when posting information such as
credit card numbers.
When overriding this method, read the request data,
write the response headers, get the response's writer or output
stream object, and finally, write the response data. It's best
to include content type and encoding. When using a
PrintWriter
object to return the response, set the
content type before accessing the PrintWriter
object.
The servlet container must write the headers before committing the response, because in HTTP the headers must be sent before the response body.
Where possible, set the Content-Length header (with the
ServletResponse.setContentLength(int)
method),
to allow the servlet container to use a persistent connection
to return its response to the client, improving performance.
The content length is automatically set if the entire response fits
inside the response buffer.
When using HTTP 1.1 chunked encoding (which means that the response has a Transfer-Encoding header), do not set the Content-Length header.
This method does not need to be either safe or idempotent. Operations requested through POST can have side effects for which the user can be held accountable, for example, updating stored data or buying items online.
If the HTTP POST request is incorrectly formatted,
doPost
returns an HTTP "Bad Request" message.
doPost
in class HttpServlet
request
- an HttpServletRequest
object that
contains the request the client has made
of the servletresponse
- an HttpServletResponse
object that
contains the response the servlet sends
to the client
ServletException
- if the request for the POST
could not be handled
IOException
- if an input or output error is
detected when the servlet handles
the requestHttpServlet.doPost(javax.servlet.http.HttpServletRequest,
javax.servlet.http.HttpServletResponse)
public final void modifiedService(ServiceReference ref, Object serv)
ServiceTrackerCustomizer
ServiceTracker
has been modified.
This method is called when a service being tracked by the
ServiceTracker
has had it properties modified.
modifiedService
in interface ServiceTrackerCustomizer
ref
- The reference to the service that has been modified.serv
- The service object for the specified referenced service.ServiceTrackerCustomizer.modifiedService(org.osgi.framework.ServiceReference,
java.lang.Object)
public final void removedService(ServiceReference ref, Object serv)
ServiceTrackerCustomizer
ServiceTracker
has been removed.
This method is called after a service is no longer being tracked by the
ServiceTracker
.
removedService
in interface ServiceTrackerCustomizer
ref
- The reference to the service that has been removed.serv
- The service object for the specified referenced service.ServiceTrackerCustomizer.removedService(org.osgi.framework.ServiceReference,
java.lang.Object)
public final Object addingService(ServiceReference ref)
ServiceTrackerCustomizer
ServiceTracker
.
This method is called before a service which matched the search
parameters of the ServiceTracker
is added to the
ServiceTracker
. This method should return the service object
to be tracked for the specified ServiceReference
. The
returned service object is stored in the ServiceTracker
and
is available from the getService
and
getServices
methods.
addingService
in interface ServiceTrackerCustomizer
ref
- The reference to the service being added to the
ServiceTracker
.
null
if the specified referenced service
should not be tracked.ServiceTrackerCustomizer.addingService(org.osgi.framework.ServiceReference)
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