Skip number of footer lines in Spring batch

I am using FlatFileItemReader to read a delimited flat file. While I could skip number of headers with field linesToSkip, I wasn't able to skip footers by number of lines.

You can create custom line mapper, within which you can either skip by regex match or line number.

public class CustomLineMapper extends DefaultLineMapper<FieldSet> {
    @Setter
    private int totalItemsToRead;
    @Override
    public FieldSet mapLine(String line, int lineNumber) throws Exception {
        if(lineNumber > totalItemsToRead){
            return null;
        }
        return super.mapLine(line, lineNumber);
    }
}

Finally register the custom line mapper the FlatFileItemReader

CustomLineMapper lineMapper = new CustomLineMapper();
    lineMapper.setTotalItemsToRead(totalLinesInFile - numberOfLinesToSkipInFooter);

FlatFileItemReader<FieldSet> reader = new FlatFileItemReader<>();
// skip headers
reader.setLinesToSkip(linesToSkipInHeader);
// skip footer
reader.setLineMapper(lineMapper);