Spring Boot项目中定制PropertyEditors方法

package com.test.bookpub.utils;

public class Isbn {
  private String isbn;

  public Isbn(String isbn) {
    this.isbn = isbn;
  }
  public String getIsbn() {
    return isbn;
  }
}

package com.test.bookpub.utils;
import org.springframework.util.StringUtils;
import java.beans.PropertyEditorSupport;

public class IsbnEditor extends PropertyEditorSupport {
  @Override
  public void setAsText(String text) throws IllegalArgumentException {
    if (StringUtils.hasText(text)) {
      setValue(new Isbn(text.trim()));
    } else {
      setValue(null);
    }
  }
  @Override  public String getAsText() {
    Isbn isbn = (Isbn) getValue();
    if (isbn != null) {
      return isbn.getIsbn();
    } else {
      return "";
    }
  }
}

@InitBinderpublic 
void initBinder(WebDataBinder binder) {
  binder.registerCustomEditor(Isbn.class, new IsbnEditor());
}

@RequestMapping(value = "/{isbn}", method = RequestMethod.GET)
public Map<String, Object> getBook(@PathVariable Isbn isbn) {
  Book book = bookRepository.findBookByIsbn(isbn.getIsbn());
  Map<String, Object> response = new LinkedHashMap<>();
  response.put("message", "get book with isbn(" + isbn.getIsbn() +")");
  response.put("book", book);  return response;
}