StackOverflow2013

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2010-08-24T16:24:15.297
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2010-08-24T17:02:43.080
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2017-05-23T12:07:08.053
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text
Body
<p>If you're using JSP as view technology, you can use the <a href="http://download.oracle.com/docs/cd/E17802_01/products/products/jsp/jstl/1.1/docs/tlddocs/" rel="nofollow noreferrer">JSTL</a> <a href="http://download.oracle.com/docs/cd/E17802_01/products/products/jsp/jstl/1.1/docs/tlddocs/c/import.html" rel="nofollow noreferrer"><code><c:import></code></a> for this. It's as simple as</p> <pre><code><c:import url="http://example.com/service" /> </code></pre> <p>It however doesn't run in sync with JSF as you'd expect from the coding. Also, this is not supported in Facelets. So if you want to render/display it conditionally (and thus run in sync with JSF) or are using Facelets, then you'll have to do this in the managed bean. To start, you can use <a href="http://download.oracle.com/javase/6/docs/api/java/net/URL.html" rel="nofollow noreferrer"><code>java.net.URL</code></a> and consorts to get content from an URL.</p> <pre><code>InputStream input = new URL("http://example.com/service").openStream(); Reader reader = new InputStreamReader(input, "UTF-8"); // You may want to verify charset based on response headers. StringBuilder builder = new StringBuilder(); for (int data; (data = reader.read()) > -1;) { builder.append((char) data); } String result = builder.toString(); </code></pre> <p>Put this in the constructor or action method, depending on the conditions it needs to execute. You can however also wrap this all in flavor of a standalone custom/composite component or EL function.</p> <h3>Related questions:</h3> <ul> <li><a href="https://stackoverflow.com/questions/2793150/how-to-use-java-net-urlconnection-to-fire-and-handle-http-requests">How to use java.net.URLConnection to fire and handle HTTP requests?</a></li> </ul>
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