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openfuture.util.servlet
Class HttpActionServlet  

java.lang.Object
  javax.servlet.GenericServlet
      javax.servlet.http.HttpServlet
          openfuture.util.servlet.HttpActionServlet

All Implemented Interfaces:

java.io.Serializable, javax.servlet.Servlet, javax.servlet.ServletConfig

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public class HttpActionServlet

extends javax.servlet.http.HttpServlet

HTTP Servlet with unified GET and POST access. Request parameters for the GET are coded into the query string:

<action-name>(&<identifier>=<value>)*

The parameters for POST are accessible via ServletRequest.getParameter(java.lang.String)>ServletRequest.getParameter(java.lang.String) 55 .

Subclasses should override handleAction(java.util.Hashtable, javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse) 55 .

Created: Sun Nov 12 10:35:37 2000 (Originally created in Web Glossary).

Version:

$Revision: 1.2 $

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Field Summary
static java.lang.String	EQUAL_SIGN           The equal sign separating key and value.
static java.lang.String	SEPARATOR           The separator symbol separating key-value pairs.

 

Fields inherited from class javax.servlet.http.HttpServlet

 

Fields inherited from class javax.servlet.GenericServlet

 

Constructor Summary

HttpActionServlet()

 

Method Summary
protected  void	addParameter(java.util.Hashtable parameters, java.lang.String key, java.lang.String value)           Add a new parameter to the hashtable.
void	doGet(javax.servlet.http.HttpServletRequest req, javax.servlet.http.HttpServletResponse res)           Extracts the action command and the parameters from the query string of GET requests and redirects it to handleAction(java.util.Hashtable, javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse) 55 .
void	doPost(javax.servlet.http.HttpServletRequest req, javax.servlet.http.HttpServletResponse res)           Called by the server (via the service method) to allow a servlet to handle a POST request.
protected  void	handleAction(java.util.Hashtable parameters, javax.servlet.http.HttpServletRequest req, javax.servlet.http.HttpServletResponse res)           Dispatcher for the action commands.
void	logException(java.lang.Exception e)           Write an exception to the log file of the servlet container.

 

Methods inherited from class javax.servlet.http.HttpServlet

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

 

Methods inherited from class javax.servlet.GenericServlet

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

 

Methods inherited from class java.lang.Object

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

 

Field Detail

SEPARATOR

public static final java.lang.String SEPARATOR

The separator symbol separating key-value pairs.

See Also:

Constant Field Values

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EQUAL_SIGN

public static final java.lang.String EQUAL_SIGN

The equal sign separating key and value.

See Also:

Constant Field Values

Constructor Detail

HttpActionServlet

public HttpActionServlet()

Method Detail

doGet

public void doGet(javax.servlet.http.HttpServletRequest req,
                  javax.servlet.http.HttpServletResponse res)
           throws javax.servlet.ServletException,
                  java.io.IOException

Extracts the action command and the parameters from the query string of GET requests and redirects it to handleAction(java.util.Hashtable, javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse) 55 .

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doPost

public void doPost(javax.servlet.http.HttpServletRequest req,
                   javax.servlet.http.HttpServletResponse res)
            throws javax.servlet.ServletException,
                   java.io.IOException

Description copied from class: javax.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)>ServletResponse.setContentLength(int) 55 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.

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handleAction

protected void handleAction(java.util.Hashtable parameters,
                            javax.servlet.http.HttpServletRequest req,
                            javax.servlet.http.HttpServletResponse res)
                     throws java.io.IOException

Dispatcher for the action commands. Shows the received action and parameters.

Subclasses should override this method.

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logException

public void logException(java.lang.Exception e)

Write an exception to the log file of the servlet container.

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addParameter

protected void addParameter(java.util.Hashtable parameters,
                            java.lang.String key,
                            java.lang.String value)

Add a new parameter to the hashtable. Each value in the hashtable is an String array.

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Overview  Package   Class  Use  Deprecated  Index
Home >> All >> openfuture >> util >> [ servlet overview ]	PREV CLASS  NEXT CLASS
SUMMARY:  JAVADOC |  SOURCE |  DOWNLOAD | NESTED | FIELD | CONSTR | METHOD	DETAIL: FIELD | CONSTR | METHOD

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