Spring DataBinding

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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);    }

@ModelAttribute("bookSearchCriteria")BookSearchCriteria criteria注释方法参数，参数criteria的值来源于criteria()方法中的model属性。

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