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POapplication/xml versus text/xml content types
 

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  1. POapplication/xml versus text/xml content types
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    <p>I am trying to get an XML response from a servlet. The servlet returns a content type of "application/xml". Using XmlHttpRequest, I can get responseText, but not responseXml. I was wondering if this had something to do with the content type or the request type (I'm doing a GET)...?</p> <p>Many thanks!</p> <p>I've pared down all my files. I <em>think</em> I'm setting that all correctly. Here's what I have:</p> <p>------- HTML ------</p> <pre><code>&lt;html&gt; &lt;head&gt; &lt;title&gt;&lt;/title&gt; &lt;script src="js/jboard_simple.js" type="text/javascript"&gt; &lt;/script&gt; &lt;/head&gt; &lt;body&gt; &lt;div id="myDiv"&gt; &lt;h2&gt;No results yet....&lt;/h2&gt; &lt;/div&gt; &lt;form name="searchForm" id="searchForm_id"&gt; &lt;input type="text" name="searchString" id="searchString_id" /&gt; &lt;button type="button" onclick="loadXMLDoc()"&gt;Perform Search&lt;/button&gt; &lt;/form&gt; &lt;/body&gt; &lt;/html&gt; </code></pre> <p>------- JavaScript -----------</p> <pre><code>function loadXMLDoc() { document.getElementById("myDiv").innerHTML = "searching..."; var xmlhttp; if (window.XMLHttpRequest) { xmlhttp = new XMLHttpRequest(); } else { xmlhttp = new ActiveXObject("Microsoft.XMLHTTP"); } xmlhttp.onreadystatechange = function() { if (xmlhttp.readyState == 4 &amp;&amp; xmlhttp.status == 200) { // Do something here... alert(xmlhttp.responseText); alert(xmlhttp.responseXml); processSearchServletResponse(xmlhttp.responseText); } } // Find teh search string var searchString_el = window.document.getElementById('searchString_id'); var searchString = searchString_el.value; alert('searchString: ' + searchString); var searchUrl = "/SimpleServlet?searchString=" + searchString; xmlhttp.open("GET", searchUrl, true); xmlhttp.send(); } function processSearchServletResponse(xmlTxt) { document.getElementById("myDiv").innerHTML = xmlTxt; } </code></pre> <p>------- Servlet --------</p> <pre><code>import java.io.BufferedOutputStream; import java.io.IOException; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.apache.log4j.Logger; import org.apache.log4j.LogManager; public class SimpleServlet extends HttpServlet { private static final long serialVersionUID = 1L; private static Logger logger = LogManager.getRootLogger(); public void service(HttpServletRequest req, HttpServletResponse res) throws ServletException, IOException { BufferedOutputStream bs = null; String simpleResponse = "&lt;?xml version=\"1.0\" encoding=\"UTF-8\"?&gt;&lt;root&gt;hi&lt;/root&gt;"; try { res.setContentType("text/xml"); res.setCharacterEncoding("UTF-8"); bs = new BufferedOutputStream(res.getOutputStream()); bs.write(simpleResponse.getBytes()); } catch (Exception ex) { logger.error("JboardSearchServlet.service(): error = ", ex); } finally { bs.flush(); bs.close(); } } } </code></pre>
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    1. CO`responseXml` can be finicky. Try the steps [outlined here](http://stackoverflow.com/questions/3781387/responsexml-always-null/3783236#3783236), and report back. Worse case, you may have to [parse `responseText` manually](http://stackoverflow.com/questions/601102/loading-a-xml-to-a-class-with-javascript).
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    2. COThanks! I tried setting the encoding to UTF-8 and the content type to both application/xml and text/xml, but it seems like in all combinations, responseXml is always undefined. I will try parsing the responseText manually as well.
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