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

All Implemented Interfaces:
Serializable, Servlet, ServletConfig, Aware, EnvironmentAware, EnvironmentCapable
Direct Known Subclasses:
FrameworkServlet, ResourceServlet
```
public abstract class HttpServletBean
extends HttpServlet
implements EnvironmentCapable, EnvironmentAware
```
Simple extension of HttpServlet which treats its config parameters (init-param entries within the servlet tag in web.xml) as bean properties.
A handy superclass for any type of servlet. Type conversion of config parameters is automatic, with the corresponding setter method getting invoked with the converted value. It is also possible for subclasses to specify required properties. Parameters without matching bean property setter will simply be ignored.
This servlet leaves request handling to subclasses, inheriting the default behavior of HttpServlet (doGet, doPost, etc).
This generic servlet base class has no dependency on the Spring ApplicationContext concept. Simple servlets usually don't load their own context but rather access service beans from the Spring root application context, accessible via the filter's ServletContext (see WebApplicationContextUtils).
The FrameworkServlet class is a more specific servlet base class which loads its own application context. FrameworkServlet serves as direct base class of Spring's full-fledged DispatcherServlet.
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), Serialized Form

Field Summary
Fields
Modifier and Type Field Description
protected Log logger
Logger available to subclasses

Constructor Summary
Constructors
Constructor Description
HttpServletBean()

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`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.
`protected ConfigurableEnvironment`	`createEnvironment()`	Create and return a new `StandardServletEnvironment`.
`ConfigurableEnvironment`	`getEnvironment()`	Return the `Environment` associated with this servlet.
`ServletContext`	`getServletContext()`	Overridden method that simply returns `null` when no ServletConfig set yet.
`String`	`getServletName()`	Overridden method that simply returns `null` when no ServletConfig set yet.
`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.
`void`	`setEnvironment(Environment environment)`	Set the `Environment` that this servlet runs in.

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, getServletInfo, 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 should be called from the constructor of a subclass.
    This method is only relevant in case of traditional initialization driven by a ServletConfig instance.
    Parameters:
    property - name of the required property
  - setEnvironment
```
public void setEnvironment(Environment environment)
```
    Set the Environment that this servlet runs in.
    Any environment set here overrides the StandardServletEnvironment provided by default.
    Specified by:
    setEnvironment in interface EnvironmentAware
    Throws:
    IllegalArgumentException - if environment is not assignable to ConfigurableEnvironment
  - getEnvironment
```
public ConfigurableEnvironment getEnvironment()
```
    Return the Environment associated with this servlet.
    If none specified, a default environment will be initialized via createEnvironment().
    Specified by:
    getEnvironment in interface EnvironmentCapable
  - createEnvironment
```
protected ConfigurableEnvironment createEnvironment()
```
    Create and return a new StandardServletEnvironment.
    Subclasses may override this in order to configure the environment or specialize the environment type returned.
  - init
```
public final void init()
                throws ServletException
```
    Map config parameters onto bean properties of this servlet, and invoke subclass initialization.
    Overrides:
    init in class GenericServlet
    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.
    This default implementation is empty.
    Parameters:
    bw - the BeanWrapper to initialize
    Throws:
    BeansException - if thrown by BeanWrapper methods
    See Also:
    PropertyEditorRegistry.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 is empty.
    Throws:
    ServletException - if subclass initialization fails
  - getServletName
```
public final String getServletName()
```
    Overridden method that simply returns null when no ServletConfig set yet.
    Specified by:
    getServletName in interface ServletConfig
    Overrides:
    getServletName in class GenericServlet
    See Also:
    GenericServlet.getServletConfig()
  - getServletContext
```
public final ServletContext getServletContext()
```
    Overridden method that simply returns null when no ServletConfig set yet.
    Specified by:
    getServletContext in interface ServletConfig
    Overrides:
    getServletContext in class GenericServlet
    See Also:
    GenericServlet.getServletConfig()

Class HttpServletBean

Field Summary

Constructor Summary

Method Summary

Methods inherited from class javax.servlet.http.HttpServlet

Methods inherited from class javax.servlet.GenericServlet

Methods inherited from class java.lang.Object

Field Detail

logger

Constructor Detail

HttpServletBean

Method Detail

addRequiredProperty

setEnvironment

getEnvironment

createEnvironment

init

initBeanWrapper

initServletBean

getServletName

getServletContext