org.springframework.web.servlet
Class HttpServletBean

java.lang.Object
  javax.servlet.GenericServlet
      javax.servlet.http.HttpServlet
          org.springframework.web.servlet.HttpServletBean

All Implemented Interfaces:

Serializable, Servlet, ServletConfig

Direct Known Subclasses:

FrameworkServlet, ResourceServlet

public abstract class HttpServletBean

extends HttpServlet

Simple extension of javax.servlet.http.HttpServlet that treats its config parameters as bean properties.

A very handy superclass for any type of servlet. Type conversion is automatic. It is also possible for subclasses to specify required properties.

This servlet leaves request handling to subclasses, inheriting the default behavior of HttpServlet (doGet, doPost, etc).

This servlet superclass has no dependency on a Spring application context, in contrast to the FrameworkServlet class which loads its own context.

Author:

Rod Johnson, Juergen Hoeller

See Also:

addRequiredProperty(java.lang.String), initServletBean(), HttpServlet.doGet(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse), HttpServlet.doPost(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse), FrameworkServlet, Serialized Form

Field Summary

protected Log

logger Logger available to subclasses

Constructor Summary

HttpServletBean()

Method Summary

protected void	addRequiredProperty(String property) Subclasses can invoke this method to specify that this property (which must match a JavaBean property they expose) is mandatory, and must be supplied as a config parameter.
void	init() Map config parameters onto bean properties of this servlet, and invoke subclass initialization.
protected void	initBeanWrapper(BeanWrapper bw) Initialize the BeanWrapper for this HttpServletBean, possibly with custom editors.
protected void	initServletBean() Subclasses may override this to perform custom initialization.

Methods inherited from class javax.servlet.http.HttpServlet

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

Methods inherited from class javax.servlet.GenericServlet

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

Methods inherited from class java.lang.Object

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

Field Detail

logger

protected final Log logger

Logger available to subclasses

Constructor Detail

HttpServletBean

public HttpServletBean()

Method Detail

addRequiredProperty

protected final void addRequiredProperty(String property)

Subclasses can invoke this method to specify that this property (which must match a JavaBean property they expose) is mandatory, and must be supplied as a config parameter. This method would normally be called from a subclass constructor.

Parameters:

property - name of the required property

init

public final void init()
                throws ServletException

Map config parameters onto bean properties of this servlet, and invoke subclass initialization.

Throws:

ServletException - if bean properties are invalid (or required properties are missing), or if subclass initialization fails.

initBeanWrapper

protected void initBeanWrapper(BeanWrapper bw)
                        throws BeansException

Initialize the BeanWrapper for this HttpServletBean, possibly with custom editors.

Parameters:

bw - the BeanWrapper to initialize

Throws:

BeansException - if thrown by BeanWrapper methods

See Also:

BeanWrapper.registerCustomEditor(java.lang.Class, java.beans.PropertyEditor)

initServletBean

protected void initServletBean()
                        throws ServletException

Subclasses may override this to perform custom initialization. All bean properties of this servlet will have been set before this method is invoked. This default implementation does nothing.

Throws:

ServletException - if subclass initialization fails