orekyuu · July 1, 2018 07:33
diff --git a/index.jsp b/index.jsp
 <%@ page import="java.util.Objects" %>
 <%@ page import="java.util.List" %>
 <%@ page import="java.io.IOException" %>
 <%@ page import="java.util.function.BiConsumer" %>
 <%@ page import="java.util.function.Predicate" %>
 <%@ page import="java.util.function.Consumer" %>
 <%@ page import="java.util.function.Function" %>
 <%@ page import="java.util.Arrays" %>
 <%@ 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 = Arrays.stream(cookies)
              .filter(new Predicate<Cookie>() {
                @Override
                public boolean test(Cookie cookie) {
                  return Objects.equals(cookie.getName(), "path");
                }
              })
              .map(new Function<Cookie, String>() {
                @Override
                public String apply(Cookie cookie) {
                  return 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 = Arrays.asList(
              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(new Predicate<Page>() {
                @Override
                public boolean test(Page page) {
                  return page.isMatch(path);
                }
              })
              .findFirst()
              .ifPresent(new Consumer<Page>() {
                @Override
                public void accept(Page page) {
                  page.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>
	<%@ page import="java.util.Objects" %>
	<%@ page import="java.util.List" %>
	<%@ page import="java.io.IOException" %>
	<%@ page import="java.util.function.BiConsumer" %>
	<%@ page import="java.util.function.Predicate" %>
	<%@ page import="java.util.function.Consumer" %>
	<%@ page import="java.util.function.Function" %>
	<%@ page import="java.util.Arrays" %>
	<%@ 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 = Arrays.stream(cookies)
	.filter(new Predicate<Cookie>() {
	@Override
	public boolean test(Cookie cookie) {
	return Objects.equals(cookie.getName(), "path");
	}
	})
	.map(new Function<Cookie, String>() {
	@Override
	public String apply(Cookie cookie) {
	return 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 = Arrays.asList(
	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(new Predicate<Page>() {
	@Override
	public boolean test(Page page) {
	return page.isMatch(path);
	}
	})
	.findFirst()
	.ifPresent(new Consumer<Page>() {
	@Override
	public void accept(Page page) {
	page.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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