Package org.springframework.http.converter

Class ObjectToStringHttpMessageConverter

java.lang.Object

org.springframework.http.converter.AbstractHttpMessageConverter<Object>

org.springframework.http.converter.ObjectToStringHttpMessageConverter

All Implemented Interfaces:

HttpMessageConverter<Object>

public class ObjectToStringHttpMessageConverter
extends AbstractHttpMessageConverter<Object>

An HttpMessageConverter that uses StringHttpMessageConverter for reading and writing content and a ConversionService for converting the String content to and from the target object type.

By default, this converter supports the media type text/plain only. This can be overridden through the supportedMediaTypes property.

A usage example:

 <bean class="org.springframework.http.converter.ObjectToStringHttpMessageConverter">
   <constructor-arg>
     <bean class="org.springframework.context.support.ConversionServiceFactoryBean"/>
   </constructor-arg>
 </bean>
 

Since:

3.2

Author:

Dmitry Katsubo, Rossen Stoyanchev

Field Summary

Fields inherited from class org.springframework.http.converter.AbstractHttpMessageConverter

logger

Constructor Summary

Constructors

Constructor	Description
ObjectToStringHttpMessageConverter(ConversionService conversionService)	A constructor accepting a ConversionService to use to convert the (String) message body to/from the target class type.
ObjectToStringHttpMessageConverter(ConversionService conversionService, Charset defaultCharset)	A constructor accepting a ConversionService as well as a default charset.

Method Summary

Modifier and Type	Method	Description
boolean	canRead(Class<?> clazz, MediaType mediaType)	This implementation checks if the given class is supported, and if the supported media types include the given media type.
boolean	canWrite(Class<?> clazz, MediaType mediaType)	This implementation checks if the given class is supported, and if the supported media types include the given media type.
protected Long	getContentLength(Object obj, MediaType contentType)	Returns the content length for the given type.
protected Object	readInternal(Class<?> clazz, HttpInputMessage inputMessage)	Abstract template method that reads the actual object.
void	setWriteAcceptCharset(boolean writeAcceptCharset)	Delegates to StringHttpMessageConverter.setWriteAcceptCharset(boolean).
protected boolean	supports(Class<?> clazz)	Indicates whether the given class is supported by this converter.
protected boolean	supportsRepeatableWrites(Object o)	Indicates whether this message converter can write the given object multiple times.
protected void	writeInternal(Object obj, HttpOutputMessage outputMessage)	Abstract template method that writes the actual body.

Methods inherited from class org.springframework.http.converter.AbstractHttpMessageConverter

addDefaultHeaders, canRead, canWrite, getDefaultCharset, getDefaultContentType, getSupportedMediaTypes, read, setDefaultCharset, setSupportedMediaTypes, write

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.springframework.http.converter.HttpMessageConverter

getSupportedMediaTypes

Constructor Details

ObjectToStringHttpMessageConverter

public ObjectToStringHttpMessageConverter(ConversionService conversionService)

A constructor accepting a ConversionService to use to convert the (String) message body to/from the target class type. This constructor uses StringHttpMessageConverter.DEFAULT_CHARSET as the default charset.

Parameters:

conversionService - the conversion service

ObjectToStringHttpMessageConverter

public ObjectToStringHttpMessageConverter(ConversionService conversionService,
 Charset defaultCharset)

A constructor accepting a ConversionService as well as a default charset.

Parameters:

conversionService - the conversion service

defaultCharset - the default charset

Method Details

setWriteAcceptCharset

public void setWriteAcceptCharset(boolean writeAcceptCharset)

Delegates to StringHttpMessageConverter.setWriteAcceptCharset(boolean).

canRead

public boolean canRead(Class<?> clazz,
 @Nullable
 MediaType mediaType)

Description copied from class: AbstractHttpMessageConverter

This implementation checks if the given class is supported, and if the supported media types include the given media type.

Specified by:

canRead in interface HttpMessageConverter<Object>

Overrides:

canRead in class AbstractHttpMessageConverter<Object>

Parameters:

clazz - the class to test for readability

mediaType - the media type to read (can be null if not specified); typically the value of a Content-Type header.

Returns:

true if readable; false otherwise

canWrite

public boolean canWrite(Class<?> clazz,
 @Nullable
 MediaType mediaType)

Description copied from class: AbstractHttpMessageConverter

This implementation checks if the given class is supported, and if the supported media types include the given media type.

Specified by:

canWrite in interface HttpMessageConverter<Object>

Overrides:

canWrite in class AbstractHttpMessageConverter<Object>

Parameters:

clazz - the class to test for writability

mediaType - the media type to write (can be null if not specified); typically the value of an Accept header.

Returns:

true if writable; false otherwise

supports

protected boolean supports(Class<?> clazz)

Description copied from class: AbstractHttpMessageConverter

Indicates whether the given class is supported by this converter.

Specified by:

supports in class AbstractHttpMessageConverter<Object>

Parameters:

clazz - the class to test for support

Returns:

true if supported; false otherwise

readInternal

protected Object readInternal(Class<?> clazz,
 HttpInputMessage inputMessage)
                       throws IOException,
HttpMessageNotReadableException

Description copied from class: AbstractHttpMessageConverter

Abstract template method that reads the actual object. Invoked from AbstractHttpMessageConverter.read(java.lang.Class<? extends T>, org.springframework.http.HttpInputMessage).

Specified by:

readInternal in class AbstractHttpMessageConverter<Object>

Parameters:

clazz - the type of object to return

inputMessage - the HTTP input message to read from

Returns:

the converted object

Throws:

IOException - in case of I/O errors

HttpMessageNotReadableException - in case of conversion errors

writeInternal

protected void writeInternal(Object obj,
 HttpOutputMessage outputMessage)
                      throws IOException

Description copied from class: AbstractHttpMessageConverter

Abstract template method that writes the actual body. Invoked from AbstractHttpMessageConverter.write(T, org.springframework.http.MediaType, org.springframework.http.HttpOutputMessage).

Specified by:

writeInternal in class AbstractHttpMessageConverter<Object>

Parameters:

obj - the object to write to the output message

outputMessage - the HTTP output message to write to

Throws:

IOException - in case of I/O errors

getContentLength

protected Long getContentLength(Object obj,
 @Nullable
 MediaType contentType)

Description copied from class: AbstractHttpMessageConverter

Returns the content length for the given type.

By default, this returns null, meaning that the content length is unknown. Can be overridden in subclasses.

Overrides:

getContentLength in class AbstractHttpMessageConverter<Object>

Parameters:

obj - the type to return the content length for

Returns:

the content length, or null if not known

supportsRepeatableWrites

protected boolean supportsRepeatableWrites(Object o)

Description copied from class: AbstractHttpMessageConverter

Indicates whether this message converter can write the given object multiple times.

Default implementation returns false.

Overrides:

supportsRepeatableWrites in class AbstractHttpMessageConverter<Object>

Parameters:

o - the object t

Returns:

true if t can be written repeatedly; false otherwise