Data binding in Spring MVC

Property editors can be used to bind String to various data types in Spring MVC. Here, enum, int and Date bindings are described.

• Enum Type

EnumEditor:

import java.beans.PropertyEditorSupport;

@SuppressWarnings("unchecked")
public class EnumEditor extends PropertyEditorSupport {
 private Class clazz;

 public EnumEditor(Class clazz) {
  this.clazz = clazz;
 };

 public String getAsText() {
  return (getValue() == null ? "" : ((Enum) getValue()).name());
 }

 public void setAsText(String text) throws IllegalArgumentException {
  setValue(Enum.valueOf(clazz, text));
 }

EnumClass:

public enum EnumClass{
    RED, GREEN, BLUE
}

Register in controller:

@InitBinder
 public void initBinder(WebDataBinder binder) {
 
  binder.registerCustomEditor(EnumClass.class,
    new EnumEditor(EnumClass.class));
 }

• Int Type

IntEditor:

import java.beans.PropertyEditorSupport;
@SuppressWarnings("unchecked")
public class IntEditor extends PropertyEditorSupport {

    private Class clazz;

       public IntEditor(Class clazz) {
           this.clazz = clazz;
       }

    public String getAsText() {
        Integer value = (Integer) getValue();
        if (value.intValue() == 0) {
            return "";
        } else {
            return value.toString();
        }
    }

    public void setAsText(String value) {
        if (value != null && value.length() > 0) {
            setValue(Integer.parseInt(value));
        } else {
            setValue(0);
        }
    }

Register in controller:

@InitBinder
    public void initBinder(WebDataBinder binder) {
        binder.registerCustomEditor(int.class, new IntEditor(int.class));
    }

• Date Type

DateEditor:

@SuppressWarnings("rawtypes")
public class DateEditor extends PropertyEditorSupport {
    private Class clazz;

    public DateEditor(Class clazz) {
        this.clazz = clazz;
    }

    public void setAsText(String value) {
        try {
          setValue(new SimpleDateFormat("yyyy-MM-dd").parse(value));
           
        } catch (ParseException e) {
            setValue(null);
        }
    }

    public String getAsText() {
        return new SimpleDateFormat("yyyy-MM-dd hh:mm a").format((Date) getValue());
    }

    public void setClazz(Class clazz) {
        this.clazz = clazz;
    }

    public Class getClazz() {
        return clazz;
    }
}

Register in controller:

@InitBinder
    public void initBinder(WebDataBinder binder) {
        binder.registerCustomEditor(Date.class, new DateEditor(Date.class));
       
    }