Spring DataBinding

1. 用@ModelAttribute注释方法 

1.1  @ModelAttribute和@RequestMapping同时注释一个方法

<span style="font-size:14px;">    @RequestMapping(method = RequestMethod.GET)
    @ModelAttribute
    public Account register(Locale currentLocale) {
        Account account = new Account();
        account.getAddress().setCountry(currentLocale.getCountry());
        return account;
    }</span>

这个方法的返回值不是视图名称，而是model属性的值。视图名称由RequestToViewNameTranslator根据请求转换为逻辑视图。
Model属性名称有@ModelAttribute(value="")指定，相当于在request中封装了key="account" , value=account。

2. 用@ModelAttribute注释方法参数

    @ModelAttribute
    public BookSearchCriteria criteria() {
        return new BookSearchCriteria();
    }

    @ModelAttribute("categories")
    public List<Category> getCategories() {
        return this.bookstoreService.findAllCategories();
    }

    /**
     * This method searches our database for books based on the given {@link BookSearchCriteria}. 
     * Only books matching the criteria are returned.
     * 
     * @param criteria the criteria used for searching
     * @return the found books
     * 
     * @see com.apress.prospringmvc.bookstore.repository.BookRepository#findBooks(BookSearchCriteria)
     */
    @RequestMapping(value = "/book/search", method = { RequestMethod.GET })
    public Collection<Book> list(@ModelAttribute("bookSearchCriteria") BookSearchCriteria criteria) {
        return this.bookstoreService.findBooks(criteria);
    }