Class HTMLHostManagerServlet

java.lang.Object

jakarta.servlet.GenericServlet

jakarta.servlet.http.HttpServlet

org.apache.catalina.manager.host.HostManagerServlet

org.apache.catalina.manager.host.HTMLHostManagerServlet

All Implemented Interfaces:

Servlet, ServletConfig, Serializable, ContainerServlet

public final class HTMLHostManagerServlet
extends HostManagerServlet

Servlet that enables remote management of the virtual hosts deployed on the server. Normally, this functionality will be protected by a security constraint in the web application deployment descriptor. However, this requirement can be relaxed during testing.

The difference between the HostManagerServlet and this Servlet is that this Servlet prints out an HTML interface which makes it easier to administrate.

However if you use a software that parses the output of HostManagerServlet you won't be able to upgrade to this Servlet since the output are not in the same format as from HostManagerServlet

Author:

Bip Thelin, Malcolm Edgar, Glenn L. Nielsen, Peter Rossbach

See Also:

• ManagerServlet
• Serialized Form

Field Summary

Fields inherited from class org.apache.catalina.manager.host.HostManagerServlet

context, debug, engine, installedHost, sm, wrapper

Fields inherited from class jakarta.servlet.http.HttpServlet

LEGACY_DO_HEAD

Constructor Summary

Constructors

Constructor	Description
HTMLHostManagerServlet()

Method Summary

Modifier and Type	Method	Description
protected String	add(HttpServletRequest request, String name, StringManager smClient)	Add a host using the specified parameters.
void	doGet(HttpServletRequest request, HttpServletResponse response)	Called by the server (via the service method) to allow a servlet to handle a GET request.
void	doPost(HttpServletRequest request, HttpServletResponse response)	Called by the server (via the service method) to allow a servlet to handle a POST request.
void	list(HttpServletRequest request, HttpServletResponse response, String message, StringManager smClient)	Render an HTML list of the currently active Contexts in our virtual host, and memory and server status information.
protected String	persist(StringManager smClient)	Persist the current configuration to server.xml.
protected String	remove(String name, StringManager smClient)	Remove the specified host.
protected String	start(String name, StringManager smClient)	Start the host with the specified name.
protected String	stop(String name, StringManager smClient)	Stop the host with the specified name.

Methods inherited from class org.apache.catalina.manager.host.HostManagerServlet

add, add, booleanParameter, destroy, getConfigBase, getWrapper, init, list, persist, remove, setWrapper, start, stop

Methods inherited from class jakarta.servlet.http.HttpServlet

doDelete, doHead, doOptions, doPut, doTrace, getLastModified, init, service, service

Methods inherited from class jakarta.servlet.GenericServlet

getInitParameter, getInitParameterNames, getServletConfig, getServletContext, getServletInfo, getServletName, log, log

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

HTMLHostManagerServlet

public HTMLHostManagerServlet()

Method Details

doGet

public void doGet(HttpServletRequest request,
 HttpServletResponse response)
           throws IOException,
ServletException

Description copied from class: jakarta.servlet.http.HttpServlet

Called by the server (via the 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.

When using HTTP 1.1 chunked encoding (which means that the response has a Transfer-Encoding header), do not set the Content-Length header.

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.

Overrides:

doGet in class HostManagerServlet

Parameters:

request - an HttpServletRequest object that contains the request the client has made of the servlet

response - an HttpServletResponse object that contains the response the servlet sends to the client

Throws:

IOException - if an input or output error is detected when the servlet handles the GET request

ServletException - if the request for the GET could not be handled

See Also:

• ServletResponse.setContentType(java.lang.String)

doPost

public void doPost(HttpServletRequest request,
 HttpServletResponse response)
            throws ServletException,
IOException

Description copied from class: jakarta.servlet.http.HttpServlet

Called by the server (via the 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.

Overrides:

doPost in class HttpServlet

Parameters:

request - an HttpServletRequest object that contains the request the client has made of the servlet

response - an HttpServletResponse object that contains the response the servlet sends to the client

Throws:

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 request

See Also:

• ServletOutputStream
• ServletResponse.setContentType(java.lang.String)

add

protected String add(HttpServletRequest request,
 String name,
 StringManager smClient)

Add a host using the specified parameters.

Parameters:

request - The Servlet request

name - Host name

smClient - StringManager for the client's locale

Returns:

output

remove

protected String remove(String name,
 StringManager smClient)

Remove the specified host.

Parameters:

name - Host name

smClient - StringManager for the client's locale

Returns:

output

start

protected String start(String name,
 StringManager smClient)

Start the host with the specified name.

Parameters:

name - Host name

smClient - StringManager for the client's locale

Returns:

output

stop

protected String stop(String name,
 StringManager smClient)

Stop the host with the specified name.

Parameters:

name - Host name

smClient - StringManager for the client's locale

Returns:

output

persist

protected String persist(StringManager smClient)

Persist the current configuration to server.xml.

Parameters:

smClient - i18n resources localized for the client

Returns:

output

list

public void list(HttpServletRequest request,
 HttpServletResponse response,
 String message,
 StringManager smClient)
          throws IOException

Render an HTML list of the currently active Contexts in our virtual host, and memory and server status information.

Parameters:

request - The request

response - The response

message - a message to display

smClient - StringManager for the client's locale

Throws:

IOException - An IO error occurred