Created
July 1, 2018 07:24
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SPA仮実装
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| <%@ page import="java.util.stream.Stream" %> | |
| <%@ page import="java.util.Objects" %> | |
| <%@ page import="java.util.List" %> | |
| <%@ page import="java.io.IOException" %> | |
| <%@ page import="java.util.function.BiConsumer" %> | |
| <%@ page contentType="text/html;charset=UTF-8" language="java" %> | |
| <html> | |
| <head> | |
| <title>真・SPA</title> | |
| </head> | |
| <body> | |
| <h1>信じられるか？これ1枚のjspなんだぜ・・・</h1> | |
| <a href="#page1">ページ1</a> | |
| <a href="#page2">ページ2</a> | |
| <% | |
| Cookie[] cookies = request.getCookies(); | |
| final String path = Stream.of(cookies).filter(cookie -> Objects.equals(cookie.getName(), "path")).map(Cookie::getValue).findFirst().orElse("/"); | |
| out.println(path); | |
| class Page { | |
| final String path; | |
| final BiConsumer<JspWriter, ServletRequest> renderer; | |
| public Page(String path, BiConsumer<JspWriter, ServletRequest> renderer) { | |
| this.path = path; | |
| this.renderer = renderer; | |
| } | |
| public boolean isMatch(String path) { | |
| return Objects.equals(this.path, path); | |
| } | |
| } | |
| List<Page> pages = List.of( | |
| new Page("/", new BiConsumer<JspWriter, ServletRequest>() { | |
| @Override | |
| public void accept(JspWriter jspWriter, ServletRequest servletRequest) { | |
| try { | |
| jspWriter.println("<h1>Top page</h1>"); | |
| } catch (IOException e) { | |
| e.printStackTrace(); | |
| } | |
| } | |
| }), | |
| new Page("/page1", new BiConsumer<JspWriter, ServletRequest>() { | |
| @Override | |
| public void accept(JspWriter jspWriter, ServletRequest servletRequest) { | |
| try { | |
| jspWriter.println("<h1>Page1</h1>"); | |
| } catch (IOException e) { | |
| e.printStackTrace(); | |
| } | |
| } | |
| }), | |
| new Page("/page2", new BiConsumer<JspWriter, ServletRequest>() { | |
| @Override | |
| public void accept(JspWriter jspWriter, ServletRequest servletRequest) { | |
| try { | |
| jspWriter.println("<h1>Page2</h1>"); | |
| } catch (IOException e) { | |
| e.printStackTrace(); | |
| } | |
| } | |
| }) | |
| ); | |
| final JspWriter writer = out; | |
| final HttpServletRequest req = request; | |
| pages.stream() | |
| .filter(p -> p.isMatch(path)).findFirst().ifPresent(p -> p.renderer.accept(writer, req)); | |
| %> | |
| <script> | |
| window.onhashchange = function (ev) { | |
| console.log(ev); | |
| var anchor = location.hash; | |
| var path = anchor; | |
| if (anchor === null) { | |
| path = ""; | |
| } else { | |
| path = location.hash.substring(1); | |
| } | |
| document.cookie = "path=/" + path + ";"; | |
| location = "/"; | |
| } | |
| </script> | |
| </body> | |
| </html> |
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