How to use

JsonObjectMarshaller

in

org.springframework.batch.item.json

@Override
public String doWrite(List<? extends T> items) {
  StringBuilder lines = new StringBuilder();
  Iterator<? extends T> iterator = items.iterator();
  if (!items.isEmpty() && state.getLinesWritten() > 0) {
    lines.append(JSON_OBJECT_SEPARATOR).append(this.lineSeparator);
  }
  while (iterator.hasNext()) {
    T item = iterator.next();
    lines.append(' ').append(this.jsonObjectMarshaller.marshal(item));
    if (iterator.hasNext()) {
      lines.append(JSON_OBJECT_SEPARATOR).append(this.lineSeparator);
    }
  }
  return lines.toString();
}

  @Test
  public void itemsShouldBeMarshalledToJsonWithTheJsonObjectMarshaller() throws Exception {
    // given
    JsonFileItemWriter<String> writer = new JsonFileItemWriter<>(this.resource, this.jsonObjectMarshaller);

    // when
    writer.open(new ExecutionContext());
    writer.write(Arrays.asList("foo", "bar"));
    writer.close();

    // then
    Mockito.verify(this.jsonObjectMarshaller).marshal("foo");
    Mockito.verify(this.jsonObjectMarshaller).marshal("bar");
  }
}

@Override
public String doWrite(List<? extends T> items) {
  StringBuilder lines = new StringBuilder();
  Iterator<? extends T> iterator = items.iterator();
  if (!items.isEmpty() && state.getLinesWritten() > 0) {
    lines.append(JSON_OBJECT_SEPARATOR).append(this.lineSeparator);
  }
  while (iterator.hasNext()) {
    T item = iterator.next();
    lines.append(' ').append(this.jsonObjectMarshaller.marshal(item));
    if (iterator.hasNext()) {
      lines.append(JSON_OBJECT_SEPARATOR).append(this.lineSeparator);
    }
  }
  return lines.toString();
}