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Return JSON from a JSP

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I need using a JSP returns JSON, so wrote the following codes for testing. Fortunately i t works. /*  This file name is json.jsp. It posts itself, then get JSON. */ <%response.setHeader("Cache-Control", "no-cache");%> <%response.setHeader("Pragma", "no-cache");%> <% String t = request.getParameter("t"); if(t==null){ %> <!DOCTYPE html> <% response.setHeader("contentType","text/html;charset=UTF-8"); %> <script type="text/javascript">   var XHR;   function requestJSON(){       if ( window.XMLHttpRequest )          XHR = new XMLHttpRequest();       else if ( window.ActiveXObject ) {          try {             XHR = new ActiveXObject('Msxml2.XMLHTTP');          }      ...
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display xml with xslt and resx in the jsp file

This is a little test for displaying xml with xslt and rest in a jsp file. A test jsp file. <!DOCTYPE html> <%@ page contentType="text/html;charset=UTF-8"%> <%@ page import="java.io.File"%> <%@ page import="javax.xml.transform.stream.StreamSource"%> <%@ page import="javax.xml.transform.stream.StreamResult"%> <%@ page import="javax.xml.transform.TransformerFactory"%> <%@ page import="javax.xml.transform.Transformer"%> <%@ page import="org.w3c.dom.Document"%> <%@ page import="org.w3c.dom.Element"%> <%@ page import="javax.xml.parsers.DocumentBuilder"%> <%@ page import="javax.xml.transform.dom.DOMSource"%> <%@ page import="javax.xml.parsers.DocumentBuilderFactory"%> <% //Create a document in the memory.         Document doc=null;                 String root = "Query";     ...
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