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POpass array from jsp to servlet
 

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  1. POpass array from jsp to servlet
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    <p>im pretty a newbie in JSP and servlets, but i have been doing a lot of research and tried a lot but i couldnt make it work. I'm working with a servlet and a JSP. Im doing a kind of sign in, in which i need to send some form information, and an array (in this case i have created the array, but i get one similar from a Dynatree) to a servlet, manage the information, and then go on to another page.</p> <p>I have tried many things, but nothings seems to work. May be im doing a lot of things wrong, but i dont have more ideas to test that might work.</p> <p>By the way, im working on netBeans, with Tomcat.</p> <p>JSP code:</p> <pre><code>&lt;%@ page language="java" contentType="text/html; charset=ISO-8859-1" pageEncoding="ISO-8859-1"%&gt; &lt;!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd"&gt; &lt;html&gt; &lt;head&gt; &lt;meta http-equiv="content-type" content="text/html; charset=ISO-8859-1"&gt; &lt;title&gt;Dynatree - Example&lt;/title&gt; &lt;script src="jquery/jquery.js" type="text/javascript"&gt;&lt;/script&gt; &lt;script src="jquery/jquery-ui.custom.js" type="text/javascript"&gt;&lt;/script&gt; &lt;script src="jquery/jquery.cookie.js" type="text/javascript"&gt;&lt;/script&gt; &lt;link href="src/skin/ui.dynatree.css" rel="stylesheet" type="text/css"&gt; &lt;script src="src/jquery.dynatree.js" type="text/javascript"&gt;&lt;/script&gt; &lt;script type="text/javascript"&gt; function myFunction(){ alert("Hello! I am an alert box!"); }; &lt;/script&gt; &lt;/head&gt; &lt;body class="example"&gt; &lt;h1&gt;Example: Form&lt;/h1&gt; &lt;form action="Test" method="post" name="form" &gt; Username: &lt;input type="text" name="userName" /&gt; &lt;br&gt; &lt;textarea name="comment"&gt;&lt;/textarea&gt; &lt;br&gt; &lt;input type="submit" id="id2" value="Send data"&gt; &lt;br&gt; &lt;input type="button" onclick="myFunction();" value="Show alert box"&gt; &lt;/form&gt; &lt;script type="text/javascript"&gt; $("#id2").click(function() { var json=[1,2,3,4]; $.ajax({ url:"Test", type:"POST", dataType:'json', data: {json:json}, success:function(data){ alert("Hello! I am an alert box!"); } }); }); &lt;/script&gt; &lt;/body&gt; &lt;/html&gt; </code></pre> <p>And my servlet "Test" Code:</p> <pre><code>@WebServlet(urlPatterns = {"/Test"}) public class Test extends HttpServlet { @Override protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { PrintWriter out = response.getWriter(); String descr = request.getParameter("comment"); String[] myJsonData = request.getParameterValues("json[]"); out.print("\nDescription:"); out.print(descr); out.print("\nPrint:"); out.print(myJsonData); // response.sendRedirect("pasoServlet.jsp"); } } /* end doPost() */ } </code></pre> <p>My main problem is that when i try to print "myJsonData", prints null, and i think it shouldnt, but i dont know why it does.</p> <pre><code>Description:This is the description Print:null </code></pre>
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    1. USchebeche
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    1. COHi chebeche, welcome to SO. What's the specific problem?
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    2. COtry String descr = request.getParameter("comment")!=null?request.getParameter("comment"):""; String[] myJsonData = request.getParameterValues("json[]")!=null?request.getParameterValues("json[]"): new String [] {"not found"}; Check i think u getting null pointer exception.
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    3. COMy problem is that i get the parameter "json" as null. I think that the problem might be in the .jsp. I've tried what Dev told me to do, but i printed "Print:[Ljava.lang.String;@23b5810f"
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