java - Spring框架中 `name`注解的 `RequestMapping`属性有哪些用例？

Question

抱歉，如果你觉得这个问题很愚蠢......我是 Spring 框架的新手。我花了几个小时寻找答案......

根据 Spring Framework 官方文档，您可以使用 name 属性为 RequestMapping 注释分配名称。

https://docs.spring.io/spring/docs/current/javadoc-api/org/springframework/web/bind/annotation/RequestMapping.html#name--

所以问题是给路由映射命名有什么意义？

在Symfony框架中，我们可以使用映射名称来生成URL。

class BlogController
{
    /**
     * @Route(name="BlogComments", path="blog/{blog}/comments/{page}")
     */
    public function listBlogComments(Blog blog, page)
    {
        ...
    }
}

然后我们可以根据路由名称生成一个 URL。

// This will generate a string "blog/27/comments/1".
$url = $this->generateUrl('BlogComments', [
    'blog' => 27,
    'page' => 1
]);

这要归功于 Symfony\Component\Routing\Router 组件。

在Spring框架中 Controller 类可以像下面这样编写。

@Controller
@ResponseBody
class BlogController {

    @RequestMapping(name="BlogComments", path="blog/{blog}/comments/{page}")
    public List<Comment> listBlogComments(@PathVariable Blog blog, @PathVariable Long page) {
        ...
    }
}

现在如何根据映射名称(在本例中为 "BlogComments")生成 URL？是否有像 Symfony 框架中那样可用的 Spring 组件或服务？还有哪些其他可能的用例？

Answer 1

来自文档:

public abstract String name

Assign a name to this mapping. Supported at the type level as well as at the method level! When used on both levels, a combined name is derived by concatenation with "#" as separator.

关键时刻是在两个级别上使用时

因此，您还应该为 Controller 指定一个名称，它应该开始工作。

@Controller
@ResponseBody
@RequestMapping(name = "AdminController")
class BlogController {

    @RequestMapping(name="BlogComments", path="blog/{blog}/comments/{page}")
    public List<Comment> listBlogComments(@PathVariable Blog blog, @PathVariable Long page) {
        ...
    }
}

然后你可以使用#访问URL

<%@ taglib uri="http://www.springframework.org/tags" prefix="s" %>

<a href="${s:mvcUrl('AdminController#BlogComments').arg("1","123").build()}">Get Person</a>

Applications can build a URL to a controller method by name with the help of the static method MvcUriComponentsBuilder#fromMappingName or in JSPs through the "mvcUrl" function registered by the Spring tag library.