Java Spark Framework:使用直接HTML模板

Question

使用直接HTML页面作为Spark模板的最简单方法是什么(IE,我不想通过TemplateEngine实现).

我可以使用模板引擎,如下所示:

Spark.get("/test", (req, res) -> new ModelAndView(map, "template.html"), new MustacheTemplateEngine());

我尝试使用没有引擎的ModelAndView:

Spark.get("/", (req, res) -> new ModelAndView(new HashMap(), "index.html"));

但是,得到的只是我的模型和视图的toString()方法:spark.ModelAndView@3bdadfd8.

我正在考虑编写自己的引擎并实现render()来执行IO来提供html文件,但是有更好的方法吗？

Answer 1

您不需要模板引擎.您只需要获取HTML文件的内容即可.

Spark.get("/", (req, res) -> renderContent("index.html"));

...

private String renderContent(String htmlFile) {
    new String(Files.readAllBytes(Paths.get(getClass().getResource(htmlFile).toURI())), StandardCharsets.UTF_8);
}

Answer 2

更新的答案

在这里提供的答案的帮助下,我已经更新了这个答案.

get("/", (req, res) -> renderContent("index.html"));

...

private String renderContent(String htmlFile) {
    try {
        // If you are using maven then your files
        // will be in a folder called resources.
        // getResource() gets that folder
        // and any files you specify.
        URL url = getClass().getResource(htmlFile);

        // Return a String which has all
        // the contents of the file.
        Path path = Paths.get(url.toURI());
        return new String(Files.readAllBytes(path), Charset.defaultCharset());
    } catch (IOException | URISyntaxException e) {
        // Add your own exception handlers here.
    }
    return null;
}

老答案

不幸的是,我发现没有其他解决办法,只能覆盖render()你自己的方法TemplateEngine.请注意以下内容使用Java NIO读取文件内容:

public class HTMLTemplateEngine extends TemplateEngine {

    @Override
    public String render(ModelAndView modelAndView) {
        try {
            // If you are using maven then your files
            // will be in a folder called resources.
            // getResource() gets that folder 
            // and any files you specify.
            URL url = getClass().getResource("public/" + 
                        modelAndView.getViewName());

            // Return a String which has all
            // the contents of the file.
            Path path = Paths.get(url.toURI());
            return new String(Files.readAllBytes(path), Charset.defaultCharset());
        } catch (IOException | URISyntaxException e) {
            // Add your own exception handlers here.
        }
        return null;
     }
}

然后,在您的路线中,您拨打HTMLTemplateEngine以下内容:

// Render index.html on homepage
get("/", (request, response) -> new ModelAndView(new HashMap(), "index.html"),
 new HTMLTemplateEngine());