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Editorial Team
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Asked: 2026-06-06T16:05:01+00:00

Hi im begin lern liferay and have one problem. I cant send POST in

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Hi im begin lern liferay and have one problem. I cant send POST in portlet from jsp.

In jsp i have :

<%@ taglib uri="http://java.sun.com/portlet_2_0" prefix="portlet" %>
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">

<portlet:defineObjects />

<div>
  <form action="HelloWorld" method="post" enctype="multipart/form-data">
   <div id="up">
    <input id="fileUpload1" type="button" name="filename" value="Привет">
   </div>
   </form>
 </div>

in portlet:

public class HelloWorld extends GenericPortlet {
protected void doGet(ActionRequest request,
     ActionResponse response) throws ServletException, IOException
     { 
 // reading the user input 
 //String color= request.getParameter("color");
 HttpServletResponse servletResponse = PortalUtil.getHttpServletResponse(response);
 PrintWriter out = servletResponse.getWriter(); 
    out.println("<HTML>");
    out.println("<HEAD <TITLE> Upload4 </TITLE> </HEAD>");
    out.println("<BODY>");
    out.println("<FORM action = \"HelloWorld\" method = \"post\" enctype = \"multipart/form-data\">");
    out.println("<div id='up'>");
    out.println("Hello World!!");
    out.println("<input id='fileUpload1' type='button' name='filename' value='Привет'>");
    out.println("</div>");
    out.println("</FORM>");
    out.println("</BODY>");
    out.println("</HTML>");
 } 
     }

Where i can mistake? I gonna write something in portlet’s XML files?

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1 Answer

  1. Editorial Team

    This is wrong on so many levels – sorry – that I don’t know where to start:

    • You should post to <portlet:actionURL />, not to “HelloWorld“
    • You should implement processAction instead of doGet (which sounds rather like a servlet)
    • You must not get access to the original HttpServletRequest in your action handler in order to write content
    • In action handling you just handle the action, during the render phase you render the HTML you need
    • the HTML you generate does not contain <html>, <head>, but just some part that the portal will embed on a page
    • and I feel like I missed a few more things…

    I recommend to start with some tutorial – like the Liferay in Action book – to get the basic concepts.

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