Problem with UTF-8 characters in a mutlipart/form-data encoded form

Paul Barry Tue, 28 Oct 2003 08:11:41 -0800

I am using Struts 1.1 in an application that needs to support the UTF-8 character set. I am using Resin 2.1.10 with character-encoding="UTF-8", and on most of my forms this seems to work just fine. I am having problems with forms that have to use the multipart/form-data enctype for handling uploading files. If I print out the value of a text element in an html:form where the enctype is not set at all (which ends up using application/x-www-form-urlencoded), using UTF-8 characters works fine. This is what I get:

INFO - test.TestAction - The value is: �

Here is what the actual HTTP request that gets sent to the server looks like:

--- Start HTTP Request -----------------------------------------------------
POST /testForm.do HTTP/1.1
Accept: image/gif, image/x-xbitmap, image/jpeg, image/pjpeg, 
application/x-shockwave-flash, */*
Referer: http://pbdesktop/test.do
Accept-Language: en-us
Content-Type: application/x-www-form-urlencoded
Accept-Encoding: gzip, deflate
User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.0)
Host: pbdesktop
Content-Length: 11
Connection: Keep-Alive
Cache-Control: no-cache
Cookie: SERVER=op; locale=en_US; JSESSIONID=aoUCARQpqsLd

test=%C3%AD
--- End HTTP Request ------------------------------------------------------

But if I modify my html:form to use enctype="multipart/form-data", I get this:

INFO - test.TestAction - The value is: A�

And the HTTP request looks like this:

--- Start HTTP Request -----------------------------------------------------
POST /testForm.do HTTP/1.1
Accept: image/gif, image/x-xbitmap, image/jpeg, image/pjpeg, 
application/x-shockwave-flash, */*
Referer: http://pbdesktop/test.do
Accept-Language: en-us
Content-Type: multipart/form-data; boundary=---------------------------7d319628600e4
Accept-Encoding: gzip, deflate
User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.0)
Host: pbdesktop
Content-Length: 141
Connection: Keep-Alive
Cache-Control: no-cache
Cookie: SERVER=op; locale=en_US; JSESSIONID=aoUCARQpqsLd

-----------------------------7d319628600e4
Content-Disposition: form-data; name="test"

í
-----------------------------7d319628600e4-
--- End HTTP Request ------------------------------------------------------

It looks as if the character is already messed up before it even gets to the servlet container. There are messages in the mailing list archive that discuss this problem, but I didn't see a solution. What is the best way to handle UTF-8 characters in a multipart/form-data encoded form?

Here is the code that I am testing with:

/test/test.jsp:
<%@ taglib uri="WEB-INF/taglib/struts-html.tld" prefix="html" %>
<%@ taglib uri="WEB-INF/taglib/struts-bean.tld" prefix="bean" %>

<html:html>
  <body>
    <html:form action="testForm.do" enctype="multipart/form-data">
      <html:text property="test" />
      <html:submit />
    </html:form>
  </body>
</html:html>

Relavent parts of struts-config.xml:
<struts-config>

  <form-beans>
    <form-bean name="testForm" type="test.TestActionForm" />
  </form-beans>

  <action-mappings>
    <action path="/test" type="org.apache.struts.actions.ForwardAction" 
parameter="/test/test.jsp" />
    <action path="/testForm" type="test.TestAction" name="testForm" input="/test.do" 
scope="request" />
  </action-mappings>

<controller contentType="text/html;charset=UTF-8" />

<struts-config/>

test.TestAction:
package test;

import javax.servlet.http.*;
import org.apache.commons.logging.*;
import org.apache.struts.action.*;

public class TestAction extends Action {
        private static final Log log = LogFactory.getLog(TestAction.class);
        
        public ActionForward execute(
                        ActionMapping mapping,
                        ActionForm pform,
                        HttpServletRequest request,
                        HttpServletResponse response)
                        throws Exception {
                TestActionForm form = (TestActionForm)pform;
                log.info("The value is: "+form.getTest());
                return null;
        }
}

test.TestActionForm:
package test;

import org.apache.struts.action.ActionForm;

public class TestActionForm extends ActionForm {
        private String test;
        public String getTest() { return test;  }
        public void setTest(String string) { test = string; }
}


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Problem with UTF-8 characters in a mutlipart/form-data encoded form

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