import org.springframework.core.convert.converter.Converter;public class IntConverter implements Converter
    
      {    @Override    public Integer convert(String text) {        if (text == null || "".equals(text)) {            return 0;        } else {            try {                Integer value = Integer.parseInt(text);                return value;            } catch (Exception e) {                return 0;            }        }    }}
    

import java.text.ParseException;import java.text.SimpleDateFormat;import java.util.Date;import org.springframework.core.convert.converter.Converter;public class DateConverter implements Converter
    
      {    @Override    public Date convert(String text) {        SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd");        dateFormat.setLenient(false);        try {            return dateFormat.parse(text);        } catch (ParseException e) {            e.printStackTrace();        }        return null;    }}