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Relism
2025-02-28 16:24:15 +00:00
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commit b73241cb2b
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<span class="line"><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;">server.get(&quot;/hello&quot;, (req, res) -&gt; {</span></span>
<span class="line"><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> return &quot;Hello, World!&quot;;</span></span>
<span class="line"><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;">});</span></span></code></pre></div><hr><p>Both <code>RequestHandler</code> and <code>SimpleHandler</code> can specify the router behavior by the naming convention of the endpoint used to register the handler.</p><ul><li><p>Literal Routing: <code>/hello</code> <br> Will match exactly <code>/hello</code></p></li><li><p>Parametrized Routing: <code>/hello/:name</code> <br> Will match <code>/hello/John</code>, <code>/hello/Alice</code>, etc.</p></li><li><p>Dynamic Routing: <code>/hello/*</code> <br> Will match <code>/hello/../..</code></p></li></ul></div></div></main><footer class="VPDocFooter" data-v-e6f2a212 data-v-1bcd8184><!--[--><!--]--><!----><nav class="prev-next" aria-labelledby="doc-footer-aria-label" data-v-1bcd8184><span class="visually-hidden" id="doc-footer-aria-label" data-v-1bcd8184>Pager</span><div class="pager" data-v-1bcd8184><a class="VPLink link pager-link prev" href="/flash/introduction/installation.html" data-v-1bcd8184><!--[--><span class="desc" data-v-1bcd8184>Previous page</span><span class="title" data-v-1bcd8184>Installation</span><!--]--></a></div><div class="pager" data-v-1bcd8184><a class="VPLink link pager-link next" href="/flash/core-concepts/request-handler.html" data-v-1bcd8184><!--[--><span class="desc" data-v-1bcd8184>Next page</span><span class="title" data-v-1bcd8184>RequestHandler</span><!--]--></a></div></nav></footer><!--[--><!--]--></div></div></div><!--[--><!--]--></div></div><!----><!--[--><!--]--></div></div>
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<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> return</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> response;</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> }</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">}</span></span></code></pre></div><div class="warning custom-block"><p class="custom-block-title">WARNING</p><p>Any logic that needs to be executed before the request handler is registered must be done within the constructor.</p></div><h2 id="request-handler-methods" tabindex="-1">Request Handler methods <a class="header-anchor" href="#request-handler-methods" aria-label="Permalink to &quot;Request Handler methods&quot;"></a></h2><p>The <code>RequestHandler</code> class provides several methods that can be used to interact with the request and response objects easily and safely. Following are listed the methods available in the <code>RequestHandler</code> class, with a brief description of their purpose:</p><table tabindex="0"><thead><tr><th>Method</th><th>Params</th><th>Description</th></tr></thead><tbody><tr><td><code>getRequestBody()</code></td><td><code>none</code></td><td>Returns a <code>JSONObject</code> representation of the request body.</td></tr><tr><td><code>getSpecification()</code></td><td><code>none</code></td><td>Returns an instance of <code>HandlerSpecification</code> containing all sorts of information about the handler.</td></tr><tr><td><code>expectedRequestParameter()</code></td><td><code>String name, description</code></td><td>Returns an instance of <code>ExpectedRequestParameter</code> for the specified parameter name.</td></tr><tr><td><code>expectedBodyField()</code></td><td><code>String name, description</code></td><td>Returns an instance of <code>ExpectedBodyField</code> for the specified field name.</td></tr><tr><td><code>expectedBodyFile()</code></td><td><code>String name, description</code></td><td>Returns an instance of <code>ExpectedBodyFile</code> for the specified file name.</td></tr></tbody></table><p>(More on the <code>ExpectedRequestParameter</code>, <code>ExpectedBodyField</code>, and <code>ExpectedBodyFile</code> classes in the next section).</p></div></div></main><footer class="VPDocFooter" data-v-e6f2a212 data-v-1bcd8184><!--[--><!--]--><!----><nav class="prev-next" aria-labelledby="doc-footer-aria-label" data-v-1bcd8184><span class="visually-hidden" id="doc-footer-aria-label" data-v-1bcd8184>Pager</span><div class="pager" data-v-1bcd8184><a class="VPLink link pager-link prev" href="/flash/core-concepts/handlers.html" data-v-1bcd8184><!--[--><span class="desc" data-v-1bcd8184>Previous page</span><span class="title" data-v-1bcd8184>Handlers</span><!--]--></a></div><div class="pager" data-v-1bcd8184><a class="VPLink link pager-link next" href="/flash/core-concepts/request-response.html" data-v-1bcd8184><!--[--><span class="desc" data-v-1bcd8184>Next page</span><span class="title" data-v-1bcd8184>Request and Response</span><!--]--></a></div></nav></footer><!--[--><!--]--></div></div></div><!--[--><!--]--></div></div><!----><!--[--><!--]--></div></div>
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@@ -37,7 +37,7 @@
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> }</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">}</span></span></code></pre></div><div class="language-java vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">java</span><pre class="shiki shiki-themes github-light github-dark vp-code" tabindex="0"><code><span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#6A737D;">// MyHandler.java</span></span>
<span class="line"></span>
<span class="line highlighted"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">@</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">RouteInfo</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;">method</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> =</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> HttpMethod.GET, </span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;">path</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> =</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> &quot;/hello&quot;</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">)</span></span>
<span class="line highlighted"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">@</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">RouteInfo</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;">endpoint</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> =</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> &quot;/hello&quot;</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">, </span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;">method</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> =</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> HttpMethod.GET)</span></span>
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">public</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> class</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;"> MyHandler</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> extends</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;"> RequestHandler</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> {</span></span>
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> public</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;"> MyHandler</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(Request </span><span style="--shiki-light:#E36209;--shiki-dark:#FFAB70;">req</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">, Response </span><span style="--shiki-light:#E36209;--shiki-dark:#FFAB70;">res</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">) {</span></span>
<span class="line"><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;"> super</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(req, res);</span></span>
@@ -49,7 +49,7 @@
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> return</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> response;</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> }</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">}</span></span></code></pre></div><p>In the example above, we create an <code>/api</code> router and register the <code>MyHandler</code> class to handle requests on the <code>/api/hello</code> endpoint.</p><p>This is because the <code>path</code> property of the <code>RouteInfo</code> annotation is relative to the base path of the router, which in this case is <code>/api</code>.</p><p>Visiting <code>/api/hello</code> from your browser will result in the response <code>Hello, world!</code>.</p></div></div></main><footer class="VPDocFooter" data-v-e6f2a212 data-v-1bcd8184><!--[--><!--]--><!----><nav class="prev-next" aria-labelledby="doc-footer-aria-label" data-v-1bcd8184><span class="visually-hidden" id="doc-footer-aria-label" data-v-1bcd8184>Pager</span><div class="pager" data-v-1bcd8184><a class="VPLink link pager-link prev" href="/flash/core-concepts/request-response.html" data-v-1bcd8184><!--[--><span class="desc" data-v-1bcd8184>Previous page</span><span class="title" data-v-1bcd8184>Request and Response</span><!--]--></a></div><div class="pager" data-v-1bcd8184><a class="VPLink link pager-link next" href="/flash/core-concepts/websockets.html" data-v-1bcd8184><!--[--><span class="desc" data-v-1bcd8184>Next page</span><span class="title" data-v-1bcd8184>Websockets</span><!--]--></a></div></nav></footer><!--[--><!--]--></div></div></div><!--[--><!--]--></div></div><!----><!--[--><!--]--></div></div>
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@@ -58,7 +58,7 @@
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> server.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">start</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">();</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> }</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">}</span></span></code></pre></div><h2 id="interacting-with-websockets-sessions" tabindex="-1">Interacting with Websockets sessions <a class="header-anchor" href="#interacting-with-websockets-sessions" aria-label="Permalink to &quot;Interacting with Websockets sessions&quot;"></a></h2><p>The <code>WebSocketSession</code> object provides methods to interact with the Websocket session, such as sending messages, closing the connection, and getting the remote address and session ID.</p><table tabindex="0"><thead><tr><th>Method</th><th>Params</th><th>Description</th></tr></thead><tbody><tr><td><code>getChannel()</code></td><td><code>none</code></td><td>Returns an instance of <code>AsynchronousSocketChannel</code> useful for retrieving info about the client .</td></tr><tr><td><code>getRequestInfo()</code></td><td><code>none</code></td><td>Returns an instance of <code>RequestInfo</code> containing all sorts of information about the request (headers, method, path etc.) .</td></tr><tr><td><code>getPath()</code></td><td><code>none</code></td><td>Returns the path to the websocket endpoint as a <code>String</code>.</td></tr><tr><td><code>getId()</code></td><td><code>none</code></td><td>Returns the id of the websocket session as a <code>String</code>, useful if you want to keep track of the connected clients in a custom manager.</td></tr><tr><td><code>getBuffer()</code></td><td><code>none</code></td><td>Returns the ByteBuffer for that session.</td></tr><tr><td><code>sendMessage()</code></td><td><code>String message</code></td><td>Sends the <code>message</code> to the client as a <code>String</code>. it&#39;s up to the developer to stringify and de-stringify any data you want to send back and forth</td></tr><tr><td><code>close()</code></td><td><code>none</code></td><td>Closes the websocket session.</td></tr></tbody></table><div class="warning custom-block"><p class="custom-block-title">NOTE</p><p><code>WebsocketHandler</code> includes a <code>setId(String id)</code> method for overriding the default session ID. Unless you have a specific reason to change it, it&#39;s best to leave it as is.</p><p>Similarly, the <code>setBuffer(ByteBuffer buffer)</code> method allows you to override the default buffer. If you&#39;re unsure about this, it&#39;s recommended to keep the default setting.</p></div></div></div></main><footer class="VPDocFooter" data-v-e6f2a212 data-v-1bcd8184><!--[--><!--]--><!----><nav class="prev-next" aria-labelledby="doc-footer-aria-label" data-v-1bcd8184><span class="visually-hidden" id="doc-footer-aria-label" data-v-1bcd8184>Pager</span><div class="pager" data-v-1bcd8184><a class="VPLink link pager-link prev" href="/flash/core-concepts/server-router.html" data-v-1bcd8184><!--[--><span class="desc" data-v-1bcd8184>Previous page</span><span class="title" data-v-1bcd8184>Server Router</span><!--]--></a></div><div class="pager" data-v-1bcd8184><a class="VPLink link pager-link next" href="/flash/file-serving/static-file-server.html" data-v-1bcd8184><!--[--><span class="desc" data-v-1bcd8184>Next page</span><span class="title" data-v-1bcd8184>Static Files Server</span><!--]--></a></div></nav></footer><!--[--><!--]--></div></div></div><!--[--><!--]--></div></div><!----><!--[--><!--]--></div></div>
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