使用Spark Framework为静态文件设置特定URL

Question

我使用的Spark服务网页.对于静态文件我初始化星火喜欢这里所说:

所以我有这个结构:

/src/main/resources/public/
                      |-- foo/
                           |-- css/
                           |    |-- bootstrap.css
                           |-- js/
                           |    ...
                           |-- img/
                                ...

我制作了一个foo文件夹,因为我的网页位于/foourl ..这样:

http://www.example.com/foo/index

所以我的静态文件像这样加载,例如:

http://www.example.com/foo/css/bootstrap.css

我现在想要的是将此路径变量.因为我有不同的环境,例如,如果我在另一个域中部署此应用程序,我希望它是:

http://www.example2.com/superfoo/css/bootstrap.css

但为此,我必须更改版本并更改文件夹...

对于控制器我很容易做到:

例:

    Spark.get(this.appBasePath + "/users", (request, response) -> {
        return this.getUsersView(request);
    }, new FreeMarkerEngine());

this.appBasePath 来自加载决定环境的配置.

所以我要问的是以编程方式设置静态文件URL而不制作任何文件夹.有没有办法实现这个目标？

Answer 1

我最终通过为所有静态文件生成get路由来解决这个问题.完全可能有更简单的方法直接在spark中执行此操作,但编写此代码所花费的时间少于了解spark.resource包的详细信息.

首先,我定义了一些辅助函数,让我迭代特定资源目录中的所有文件(需要Java 8):

/**
 * Find all resources within a particular resource directory
 * @param root base resource directory. Should omit the leading / (e.g. "" for all resources)
 * @param fn Function called for each resource with a Path corresponding to root and a relative path to the resource.
 * @throws URISyntaxException
 */
public static void findResources(String root,BiConsumer<Path,Path> fn) throws URISyntaxException {
    ClassLoader cl = Main.class.getClassLoader();
    URL url = cl.getResource(root);     
    assert "file".equals(url.getProtocol());
    logger.debug("Static files loaded from {}",root);
    Path p = Paths.get(url.toURI());
    findAllFiles(p, (path) -> fn.accept(p,p.relativize(path)) );
}
/**
 * Recursively search over a directory, running the specified function for every regular file.
 * @param root Root directory
 * @param fn Function that gets passed a Path for each regular file
 */
private static void findAllFiles(Path root, Consumer<Path> fn) {
    try( DirectoryStream<Path> directoryStream = Files.newDirectoryStream(root)) {
        for(Path path : directoryStream) {
            if(Files.isDirectory(path)) {
                findAllFiles(path, fn);
            } else {
                fn.accept(path);
            }
        }
    } catch (IOException ex) {}
}

然后我用它来为每个文件定义一个新的GET路由

String webroot = "/server1";
findResources("static", (root,path) -> {
    String route = webroot+"/"+path;
    String resourcePath = "/static/"+path.toString();
    logger.debug("Mapping {} to {}",route, resourcePath);
    get(webroot+"/"+path, (req,res) -> {
        Files.copy(root.resolve(path), res.raw().getOutputStream());
        AbstractFileResolvingResource resource = new ExternalResource(resourcePath);
        String contentType = MimeType.fromResource(resource);
        res.type(contentType );
        return "";
    } );
});