list to flat file

[premsoft]

HI,

If I am getting the list from various external sources(From two Webservices), if I want to write this list in the flat file, can I use the FlatFileItemWriter?

How can I iterate the list in spring batch?

Appreciate your help

[DHGarrette]

If you just want to use the FlatFileItemWriter on its own, you can do that by passing your list to the write() method:

writer.setResource(new FileSystemResource(outputFile));
writer.setLineAggregator(someLineAggregator);
writer.open(new ExecutionContext());
writer.write(myList);
writer.close();

If you want to do it in a "batch processing" way, then you can configure a batch job that uses a ListItemReader and a FlatFileItemWriter. You can do the webservice calls from within the ItemReader by creating a custom wrapper to the ListItemReader:

public class MyItemReader<MyItemType> extends ItemStreamSupport implements ItemReader<MyItemType> {
    private ItemReader listItemReader = null;

    public void open(ExecutionContext executionContext) throws ItemStreamException {
        List<MyItemType> webserviceData = getListFromWebservices();
        this.listItemReader = new ListItemReader(webserviceData);
    }

    public MyItemType read() {
        return this.listItemReader.read();
    }
}