Spring Framework - Formatter Examples

import org.springframework.format.Formatter;

import java.text.ParseException;
import java.util.Locale;

public class AddressFormatter implements Formatter<Address> {

    private Style style = Style.FULL;

    public void setStyle (Style style) {
        this.style = style;
    }

    @Override
    public Address parse (String text, Locale locale) throws ParseException {
        if (text != null) {
            String[] parts = text.split(",");
            if (style == Style.FULL && parts.length == 4) {
                Address address = new Address();
                address.setStreet(parts[0].trim());
                address.setCity(parts[1].trim());
                address.setZipCode(parts[2].trim());
                address.setCounty(parts[3].trim());
                return address;
            } else if (style == Style.REGION && parts.length == 3) {
                Address address = new Address();
                address.setCity(parts[0].trim());
                address.setZipCode(parts[1].trim());
                address.setCounty(parts[4].trim());
                return address;
            }
        }
        return null;
    }

    @Override
    public String print (Address a, Locale l) {
        if (a == null) {
            return "";
        }
        switch (style) {
            case FULL:
                return String.format(l, "%s, %s, %s, %s", a.getStreet(), a.getCity(),
                                     a.getZipCode(), a.getCounty());
            case REGION:
                return String.format(l, "%s, %s, %s", a.getCity(), a.getZipCode(), a.getCounty());
        }
        return a.toString();
    }

    public enum Style {
        FULL,
        REGION
    }

package com.logicbig.example;

import org.springframework.format.support.DefaultFormattingConversionService;

/**
 * This example formats Employee object in following format:
 * Employee#name, Employee#dept, Employee#phoneNumber
 */
public class CustomFormatterExample {

    public static void main(String[] args) {
        DefaultFormattingConversionService service =
                new DefaultFormattingConversionService();
        service.addFormatter(new EmployeeFormatter());

        Employee employee = new Employee("Joe", "IT", "123-456-7890");
        String string = service.convert(employee, String.class);
        System.out.println(string);

        //converting back to Employee
        Employee e = service.convert(string, Employee.class);
        System.out.println(e);
    }

}

package com.logicbig.example;

import org.springframework.format.Formatter;
import java.text.ParseException;
import java.util.Locale;
import java.util.StringJoiner;

public class EmployeeFormatter implements Formatter<Employee> {

    @Override
    public Employee parse(String text,
                          Locale locale) throws ParseException {


        String[] split = text.split(",");
        if (split.length != 3) {
            throw new ParseException("The Employee string format " +
                    "should be in this format: Mike, Account, 111-111-1111",
                    split.length);
        }
        Employee employee = new Employee(split[0].trim(),
                split[1].trim(), split[2].trim());
        return employee;
    }

    @Override
    public String print(Employee employee, Locale locale) {
        return new StringJoiner(", ")
                .add(employee.getName())
                .add(employee.getDept())
                .add(employee.getPhoneNumber())
                .toString();

    }
}

package com.logicbig.example;


public class Employee {
    private String name;
    private String dept;
    private String phoneNumber;

    public Employee(String name, String dept, String phoneNumber) {
        this.name = name;
        this.dept = dept;
        this.phoneNumber = phoneNumber;
    }

    public String getName() {
        return name;
    }

    public String getDept() {
        return dept;
    }


    public String getPhoneNumber() {
        return phoneNumber;
    }

    @Override
    public String toString() {
        return "Employee{" +
                "name='" + name + '\'' +
                ", dept='" + dept + '\'' +
                ", phoneNumber='" + phoneNumber + '\'' +
                '}';
    }
}