Package org.springframework.batch.item.json

Class JsonFileItemWriter<T>

java.lang.Object

org.springframework.batch.item.ItemStreamSupport

org.springframework.batch.item.support.AbstractItemStreamItemWriter<T>

org.springframework.batch.item.support.AbstractFileItemWriter<T>

org.springframework.batch.item.json.JsonFileItemWriter<T>

Type Parameters:

T - type of object to write as json representation

All Implemented Interfaces:

ResourceAwareItemWriterItemStream<T>, ItemStream, ItemStreamWriter<T>, ItemWriter<T>, org.springframework.beans.factory.InitializingBean

public class JsonFileItemWriter<T>
extends AbstractFileItemWriter<T>

Item writer that writes data in json format to an output file. The location of the output file is defined by a WritableResource and must represent a writable file. Items are transformed to json format using a JsonObjectMarshaller. Items will be enclosed in a json array as follows:

[ {json object}, {json object}, {json object} ]

The implementation is not thread-safe.

Since:

4.1

Author:

Mahmoud Ben Hassine

See Also:

• GsonJsonObjectMarshaller
• JacksonJsonObjectMarshaller

Nested Class Summary

Nested classes/interfaces inherited from class org.springframework.batch.item.support.AbstractFileItemWriter

AbstractFileItemWriter.OutputState

Field Summary

Fields inherited from class org.springframework.batch.item.support.AbstractFileItemWriter

append, DEFAULT_CHARSET, DEFAULT_LINE_SEPARATOR, DEFAULT_TRANSACTIONAL, lineSeparator, logger, shouldDeleteIfExists, state

Constructor Summary

Constructors

Constructor	Description
JsonFileItemWriter(org.springframework.core.io.WritableResource resource, JsonObjectMarshaller<T> jsonObjectMarshaller)	Create a new JsonFileItemWriter instance.

Method Summary

Modifier and Type	Method	Description
void	afterPropertiesSet()	Assert that mandatory properties (jsonObjectMarshaller) are set.
String	doWrite(List<? extends T> items)	Write out a string of items followed by a "new line", where the format of the new line separator is determined by the underlying operating system.
void	setJsonObjectMarshaller(JsonObjectMarshaller<T> jsonObjectMarshaller)	Set the JsonObjectMarshaller to use to marshal object to json.

Methods inherited from class org.springframework.batch.item.support.AbstractFileItemWriter

close, getOutputState, open, setAppendAllowed, setEncoding, setFooterCallback, setForceSync, setHeaderCallback, setLineSeparator, setResource, setSaveState, setShouldDeleteIfEmpty, setShouldDeleteIfExists, setTransactional, update, write

Methods inherited from class org.springframework.batch.item.ItemStreamSupport

getExecutionContextKey, setExecutionContextName, setName

Methods inherited from class java.lang.Object

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

Constructor Details

JsonFileItemWriter

public JsonFileItemWriter(org.springframework.core.io.WritableResource resource,
 JsonObjectMarshaller<T> jsonObjectMarshaller)

Create a new JsonFileItemWriter instance.

Parameters:

resource - to write json data to

jsonObjectMarshaller - used to marshal object into json representation

Method Details

afterPropertiesSet

public void afterPropertiesSet()
                        throws Exception

Assert that mandatory properties (jsonObjectMarshaller) are set.

Throws:

Exception

See Also:

• InitializingBean.afterPropertiesSet()

setJsonObjectMarshaller

public void setJsonObjectMarshaller(JsonObjectMarshaller<T> jsonObjectMarshaller)

Set the JsonObjectMarshaller to use to marshal object to json.

Parameters:

jsonObjectMarshaller - the marshaller to use

doWrite

public String doWrite(List<? extends T> items)

Description copied from class: AbstractFileItemWriter

Write out a string of items followed by a "new line", where the format of the new line separator is determined by the underlying operating system.

Specified by:

doWrite in class AbstractFileItemWriter<T>

Parameters:

items - to be written

Returns:

written lines