将春季批处理中的不良行排除到ItemWriter

Question

Cob Date;Supplier Code;Customer Code;
20180123;ABCLTD;43434;
20180123;BCD;4645;
;;;;;;;;
;;;;;;;

How can I avoid passing lines with ;;;;;; to the writer?

My mapper class looks something like this:

public class Mapper implements FieldSetMapper<Model> {


    @Override
    public PosRow mapFieldSet(FieldSet fieldSet) {

        if (fieldSet == null) {
            return null;
        }

        Model pos = new Model();

        try {

            if (!StringUtils.isEmpty(fieldSet.readString("cobDate"))) {
                pos.setCobDate(new Date());
            }

            } catch(...) {}

            }
            return pos;
    }

I check for fieldset==null and then check for each delimited fields and set the values to model. Next, in my processor looks like this:

public class ModelItemProcessor implements ItemProcessor<Model, AnotherModel> {

    private Set<AnotherModel> anotherModelSet= new HashSet<>();

    @Override
    public AnotherModel process(final Model posRow) throws Exception {

        if (posRow == null) {

        }

        if (!posRow.isValid()) {
            return null;
        }


       AnotherModel scp = new AnotherModel();

      //sett values

        if (anotherModelSet.contains(scp)) return null;

        anotherModelSet.add(scp);

        return scp;
    }

but still in my write() method i get items that are of size 0.

Answer 1

Make sure that your processor returns null when a record is invalid. In your code, you're catching exceptions in the mapFieldSet() call, but you're returning an empty PosRow record. Instead, try something like:

    try {

        if (!StringUtils.isEmpty(fieldSet.readString("cobDate"))) {
            pos.setCobDate(new Date());
        }

        } 
        catch(...) {
            return null;
        }

        }
        return pos;