Class StringHttpMessageConverter

java.lang.Object

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

org.springframework.http.converter.StringHttpMessageConverter

All Implemented Interfaces:

HttpMessageConverter<String>

public class StringHttpMessageConverter
extends AbstractHttpMessageConverter<String>

Implementation of HttpMessageConverter that can read and write strings.

By default, this converter supports all media types (*/*), and writes with a Content-Type of text/plain. This can be overridden by setting the supportedMediaTypes property.

Since:

3.0

Author:

Arjen Poutsma, Juergen Hoeller

Field Summary

Fields

Modifier and Type	Field	Description
static final Charset	DEFAULT_CHARSET	The default charset used by the converter.

Fields inherited from class AbstractHttpMessageConverter

logger

Constructor Summary

Constructors

Constructor	Description
StringHttpMessageConverter()	A default constructor that uses "ISO-8859-1" as the default charset.
StringHttpMessageConverter(Charset defaultCharset)	A constructor accepting a default charset to use if the requested content type does not specify one.

Method Summary

Modifier and Type	Method	Description
protected void	addDefaultHeaders(HttpHeaders headers, String s, @Nullable MediaType type)	Add default headers to the output message.
protected List<Charset>	getAcceptedCharsets()	Return the list of supported Charsets.
protected Long	getContentLength(String str, @Nullable MediaType contentType)	Returns the content length for the given type.
protected String	readInternal(Class<? extends String> clazz, HttpInputMessage inputMessage)	Abstract template method that reads the actual object.
void	setWriteAcceptCharset(boolean writeAcceptCharset)	Whether the Accept-Charset header should be written to any outgoing request sourced from the value of Charset.availableCharsets().
boolean	supports(Class<?> clazz)	Indicates whether the given class is supported by this converter.
protected boolean	supportsRepeatableWrites(String s)	Indicates whether this message converter can write the given object multiple times.
protected void	writeInternal(String str, HttpOutputMessage outputMessage)	Abstract template method that writes the actual body.

Methods inherited from class AbstractHttpMessageConverter

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

Methods inherited from class Object

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

Methods inherited from interface HttpMessageConverter

getSupportedMediaTypes

Field Details

DEFAULT_CHARSET

public static final Charset DEFAULT_CHARSET

The default charset used by the converter.

Constructor Details

StringHttpMessageConverter

public StringHttpMessageConverter()

A default constructor that uses "ISO-8859-1" as the default charset.

See Also:

• StringHttpMessageConverter(Charset)

StringHttpMessageConverter

public StringHttpMessageConverter(Charset defaultCharset)

A constructor accepting a default charset to use if the requested content type does not specify one.

Method Details

setWriteAcceptCharset

public void setWriteAcceptCharset(boolean writeAcceptCharset)

Whether the Accept-Charset header should be written to any outgoing request sourced from the value of Charset.availableCharsets(). The behavior is suppressed if the header has already been set.

As of 5.2, by default is set to false.

supports

public 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<String>

Parameters:

clazz - the class to test for support

Returns:

true if supported; false otherwise

readInternal

protected String readInternal(Class<? extends String> clazz,
 HttpInputMessage inputMessage)
                       throws IOException

Description copied from class: AbstractHttpMessageConverter

Abstract template method that reads the actual object. Invoked from AbstractHttpMessageConverter.read(Class, HttpInputMessage).

Specified by:

readInternal in class AbstractHttpMessageConverter<String>

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

getContentLength

protected Long getContentLength(String str,
 @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<String>

Parameters:

str - the type to return the content length for

Returns:

the content length, or null if not known

addDefaultHeaders

protected void addDefaultHeaders(HttpHeaders headers,
 String s,
 @Nullable MediaType type)
                          throws IOException

Description copied from class: AbstractHttpMessageConverter

Add default headers to the output message.

This implementation delegates to AbstractHttpMessageConverter.getDefaultContentType(Object) if a content type was not provided, set if necessary the default character set, calls AbstractHttpMessageConverter.getContentLength(T, MediaType), and sets the corresponding headers.

Overrides:

addDefaultHeaders in class AbstractHttpMessageConverter<String>

Throws:

IOException

writeInternal

protected void writeInternal(String str,
 HttpOutputMessage outputMessage)
                      throws IOException

Description copied from class: AbstractHttpMessageConverter

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

Specified by:

writeInternal in class AbstractHttpMessageConverter<String>

Parameters:

str - the object to write to the output message

outputMessage - the HTTP output message to write to

Throws:

IOException - in case of I/O errors

getAcceptedCharsets

protected List<Charset> getAcceptedCharsets()

Return the list of supported Charsets.

By default, returns Charset.availableCharsets(). Can be overridden in subclasses.

Returns:

the list of accepted charsets

supportsRepeatableWrites

protected boolean supportsRepeatableWrites(String s)

Description copied from class: AbstractHttpMessageConverter

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

The default implementation returns false.

Overrides:

supportsRepeatableWrites in class AbstractHttpMessageConverter<String>

Parameters:

s - the object t

Returns:

true if t can be written repeatedly; false otherwise