org.springframework.web.reactive.result.view.freemarker

Class FreeMarkerView

java.lang.Object

org.springframework.web.reactive.result.view.AbstractView

org.springframework.web.reactive.result.view.AbstractUrlBasedView

org.springframework.web.reactive.result.view.freemarker.FreeMarkerView

All Implemented Interfaces:

Aware, InitializingBean, ApplicationContextAware, View

public class FreeMarkerView
extends AbstractUrlBasedView

A View implementation that uses the FreeMarker template engine.

Depends on a single FreeMarkerConfig object such as FreeMarkerConfigurer being accessible in the application context. Alternatively set the FreeMarker configuration can be set directly on this class via setConfiguration(Configuration).

The url property is the location of the FreeMarker template relative to the FreeMarkerConfigurer's templateLoaderPath.

Note: Spring's FreeMarker support requires FreeMarker 2.3 or higher.

Since:

5.0

Author:

Rossen Stoyanchev

Field Summary

Fields

Modifier and Type	Field and Description
private Configuration	configuration
private java.lang.String	encoding

Fields inherited from class org.springframework.web.reactive.result.view.AbstractView

logger, REQUEST_DATA_VALUE_PROCESSOR_BEAN_NAME

Constructor Summary

Constructors

Constructor and Description
FreeMarkerView()

Method Summary

Modifier and Type	Method and Description
void	afterPropertiesSet() Invoked by a BeanFactory after it has set all bean properties supplied (and satisfied BeanFactoryAware and ApplicationContextAware).
protected FreeMarkerConfig	autodetectConfiguration() Autodetect a FreeMarkerConfig object via the ApplicationContext.
boolean	checkResourceExists(java.util.Locale locale) Check that the FreeMarker template used for this view exists and is valid.
private java.util.Optional<java.nio.charset.Charset>	getCharset(MediaType mediaType)
protected Configuration	getConfiguration() Return the FreeMarker configuration used by this view.
protected java.lang.String	getEncoding() Return the encoding for the FreeMarker template.
protected ObjectWrapper	getObjectWrapper() Return the configured FreeMarker ObjectWrapper, or the default wrapper if none specified.
protected Template	getTemplate(java.util.Locale locale) Retrieve the FreeMarker template for the given locale, to be rendering by this view.
protected SimpleHash	getTemplateModel(java.util.Map<java.lang.String,java.lang.Object> model, ServerWebExchange exchange) Build a FreeMarker template model for the given model Map.
protected <any>	renderInternal(java.util.Map<java.lang.String,java.lang.Object> renderAttributes, MediaType contentType, ServerWebExchange exchange) Subclasses must implement this method to actually render the view.
void	setConfiguration(Configuration configuration) Set the FreeMarker Configuration to be used by this view.
void	setEncoding(java.lang.String encoding) Set the encoding of the FreeMarker template file.

Methods inherited from class org.springframework.web.reactive.result.view.AbstractUrlBasedView

getUrl, setUrl, toString

Methods inherited from class org.springframework.web.reactive.result.view.AbstractView

createRequestContext, getApplicationContext, getDefaultCharset, getModelAttributes, getRequestContextAttribute, getRequestDataValueProcessor, getSupportedMediaTypes, render, setApplicationContext, setDefaultCharset, setRequestContextAttribute, setSupportedMediaTypes

Methods inherited from class java.lang.Object

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

Field Detail

configuration

private Configuration configuration

encoding

private java.lang.String encoding

Constructor Detail

FreeMarkerView

public FreeMarkerView()

Method Detail

setConfiguration

public void setConfiguration(Configuration configuration)

Set the FreeMarker Configuration to be used by this view.

Typically this property is not set directly. Instead a single FreeMarkerConfig is expected in the Spring application context which is used to obtain the FreeMarker configuration.

getConfiguration

protected Configuration getConfiguration()

Return the FreeMarker configuration used by this view.

setEncoding

public void setEncoding(java.lang.String encoding)

Set the encoding of the FreeMarker template file.

By default FreeMarkerConfigurer sets the default encoding in the FreeMarker configuration to "UTF-8". It's recommended to specify the encoding in the FreeMarker Configuration rather than per template if all your templates share a common encoding.

getEncoding

protected java.lang.String getEncoding()

Return the encoding for the FreeMarker template.

afterPropertiesSet

public void afterPropertiesSet()
                        throws java.lang.Exception

Description copied from interface: InitializingBean

Invoked by a BeanFactory after it has set all bean properties supplied (and satisfied BeanFactoryAware and ApplicationContextAware).

This method allows the bean instance to perform initialization only possible when all bean properties have been set and to throw an exception in the event of misconfiguration.

Specified by:

afterPropertiesSet in interface InitializingBean

Overrides:

afterPropertiesSet in class AbstractUrlBasedView

Throws:

java.lang.Exception - in the event of misconfiguration (such as failure to set an essential property) or if initialization fails.

autodetectConfiguration

protected FreeMarkerConfig autodetectConfiguration()
                                            throws BeansException

Autodetect a FreeMarkerConfig object via the ApplicationContext.

Returns:

the Configuration instance to use for FreeMarkerViews

Throws:

BeansException - if no Configuration instance could be found

See Also:

setConfiguration(Configuration)

checkResourceExists

public boolean checkResourceExists(java.util.Locale locale)
                            throws java.lang.Exception

Check that the FreeMarker template used for this view exists and is valid.

Can be overridden to customize the behavior, for example in case of multiple templates to be rendered into a single view.

Specified by:

checkResourceExists in class AbstractUrlBasedView

Parameters:

locale - the desired Locale that we're looking for

Returns:

false if the resource exists false if we know that it does not exist

Throws:

java.lang.Exception - if the resource exists but is invalid (e.g. could not be parsed)

renderInternal

protected <any> renderInternal(java.util.Map<java.lang.String,java.lang.Object> renderAttributes,
                               MediaType contentType,
                               ServerWebExchange exchange)

Description copied from class: AbstractView

Subclasses must implement this method to actually render the view.

Specified by:

renderInternal in class AbstractView

Parameters:

renderAttributes - combined output Map (never null), with dynamic values taking precedence over static attributes

contentType - the content type selected to render with which should match one of the supported media types.

exchange - current exchange @return Mono to represent when and if rendering succeeds

getCharset

private java.util.Optional<java.nio.charset.Charset> getCharset(MediaType mediaType)

getTemplateModel

protected SimpleHash getTemplateModel(java.util.Map<java.lang.String,java.lang.Object> model,
                                      ServerWebExchange exchange)

Build a FreeMarker template model for the given model Map.

The default implementation builds a SimpleHash.

Parameters:

model - the model to use for rendering

exchange - current exchange

Returns:

the FreeMarker template model, as a SimpleHash or subclass thereof

getObjectWrapper

protected ObjectWrapper getObjectWrapper()

Return the configured FreeMarker ObjectWrapper, or the default wrapper if none specified.

See Also:

freemarker.template.Configuration#getObjectWrapper()

getTemplate

protected Template getTemplate(java.util.Locale locale)
                        throws java.io.IOException

Retrieve the FreeMarker template for the given locale, to be rendering by this view.

By default, the template specified by the "url" bean property will be retrieved.

Parameters:

locale - the current locale

Returns:

the FreeMarker template to render

Throws:

java.io.IOException