Spring Boot定制type Formatters实例详解

package com.test.bookpub.formatters;

import com.test.bookpub.domain.Book;
import com.test.bookpub.repository.BookRepository;
import org.springframework.format.Formatter;
import java.text.ParseException;
import java.util.Locale;

public class BookFormatter implements Formatter<Book> {
 private BookRepository repository;

 public BookFormatter(BookRepository repository) {
  this.repository = repository;
 }
 
 @Override
 public Book parse(String bookIdentifier, Locale locale) throws ParseException {
  Book book = repository.findBookByIsbn(bookIdentifier);
  return book != null ? book : repository.findOne(Long.valueOf(bookIdentifier));
 }
 
 @Override
 public String print(Book book, Locale locale) {
  return book.getIsbn();
 }
}

@Autowired
private BookRepository bookRepository;

@Override
public void addFormatters(FormatterRegistry registry) {
 registry.addFormatter(new BookFormatter(bookRepository));
}

@RequestMapping(value = "/{isbn}/reviewers", method = RequestMethod.GET)
public List<Reviewer> getReviewers(@PathVariable("isbn") Book book) {
 return book.getReviewers();
}

HTTP/1.1 200 OK
Content-Type: application/json;charset=UTF-8
Date: Tue, 08 Dec 2015 08:15:31 GMT
Server: Apache-Coyote/1.1
Transfer-Encoding: chunked

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