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Spring - DataBinder Using ConversionService

[Last Updated: Oct 18, 2022]

DataBinder using ConversionService

By default DataBinder uses PropertyEditors for binding process but it can be hooked up with a conversion service for property values conversion.

Example

Following example shows DataBinder using a custom converter (DateToLocalDateTimeConverter) registered with DefaultConversionService.

package com.logicbig.example;

import java.time.LocalDateTime;

public class MyObject {
  private LocalDateTime date;
    .............
}
package com.logicbig.example;

import org.springframework.core.convert.converter.Converter;
import java.time.LocalDateTime;
import java.time.ZoneId;
import java.util.Date;

public class DateToLocalDateTimeConverter
      implements Converter<Date, LocalDateTime> {

  @Override
  public LocalDateTime convert(Date source) {
      return LocalDateTime.ofInstant(source.toInstant(),
              ZoneId.systemDefault());
  }
}
package com.logicbig.example;

import org.springframework.beans.MutablePropertyValues;
import org.springframework.core.convert.support.DefaultConversionService;
import org.springframework.validation.DataBinder;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.TimeZone;

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

      MutablePropertyValues mpv = new MutablePropertyValues();

      Date date = new SimpleDateFormat("MM/dd/yyyy hh:mm:ss a")
              .parse("01/20/2022 00:00:00 AM");
      mpv.add("date", date);

      DataBinder dataBinder = new DataBinder(new MyObject());
      DefaultConversionService service = new DefaultConversionService();
      service.addConverter(new DateToLocalDateTimeConverter());
      //commenting the following line will not populate date field
      dataBinder.setConversionService(service);

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

Output

target=MyObject{date=2022-01-20T00:00}
org.springframework.validation.BindingResult.target=org.springframework.validation.BeanPropertyBindingResult: 0 errors



Example Project

Dependencies and Technologies Used:

  • spring-context 5.3.23 (Spring Context)
     Version Compatibility: 3.2.3.RELEASE - 5.3.23 Version List
    ×

    Version compatibilities of spring-context with this example:

    • 3.2.3.RELEASE
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    Versions in green have been tested.

  • JDK 8
  • Maven 3.8.1

Spring - DataBinder with DefaultConversionService example Select All Download
  • spring-data-binder-using-conversion-service
    • src
      • main
        • java
          • com
            • logicbig
              • example
                • ConversionServiceWithDataBinderExample.java

    See Also