Just like conversion service, formatter conversion service (DefaultFormattingConversionService) can also be used with DataBinder.

Example

A custom formatter

package com.logicbig.example;

import org.springframework.format.Formatter;

import java.text.ParseException;
import java.time.LocalDateTime;
import java.time.ZoneId;
import java.time.ZonedDateTime;
import java.time.format.DateTimeFormatter;
import java.util.Locale;

public class RFC1123LocalDateTimeFormatter
      implements Formatter<LocalDateTime> {

  private ZoneId targetZoneId;

  public RFC1123LocalDateTimeFormatter(ZoneId targetZoneId) {
      this.targetZoneId = targetZoneId;
  }

  @Override
  public LocalDateTime parse(String text, Locale locale) throws ParseException {
      return ZonedDateTime.parse(text, DateTimeFormatter.RFC_1123_DATE_TIME)
              .withZoneSameInstant(targetZoneId)
              .toLocalDateTime();
  }

  @Override
  public String print(LocalDateTime object, Locale locale) {
      return object.format(DateTimeFormatter.RFC_1123_DATE_TIME);
  }
}

A POJO

package com.logicbig.example;

import java.time.LocalDateTime;

public class MyObject {
  private LocalDateTime dateAtTargetTimeZone;

  public LocalDateTime getDateAtTargetTimeZone() {
      return dateAtTargetTimeZone;
  }

  public void setDateAtTargetTimeZone(LocalDateTime dateAtTargetTimeZone) {
      this.dateAtTargetTimeZone = dateAtTargetTimeZone;
  }

  @Override
  public String toString() {
      return "MyObject{" +
              "dateAtTargetTimeZone=" + dateAtTargetTimeZone +
              '}';
  }
}

Using DataBinder with DefaultFormattingConversionService

package com.logicbig.example;

import org.springframework.beans.MutablePropertyValues;
import org.springframework.format.support.DefaultFormattingConversionService;
import org.springframework.validation.DataBinder;

import java.time.ZoneId;

public class ConversionServiceWithDataBinderExample {
  public static void main(String[] args) {

      MutablePropertyValues mpv = new MutablePropertyValues();
      mpv.add("dateAtTargetTimeZone", "Thu, 25 Aug 2016 08:59:00 GMT");

      DataBinder dataBinder = new DataBinder(new MyObject());
      DefaultFormattingConversionService service = new DefaultFormattingConversionService();
      service.addFormatter(new RFC1123LocalDateTimeFormatter(ZoneId.of("America/Chicago")));
      dataBinder.setConversionService(service);

      dataBinder.bind(mpv);
      dataBinder.getBindingResult()
              .getModel()
              .entrySet()
              .forEach(System.out::println);
  }
}

Output

target=MyObject{dateAtTargetTimeZone=2016-08-25T03:59}
org.springframework.validation.BindingResult.target=org.springframework.validation.BeanPropertyBindingResult: 0 errors

Example Project

Dependencies and Technologies Used:

• spring-context 5.3.23 (Spring Context)
  
• JDK 8
• Maven 3.8.1