Question

I have a Tapestry application that is serving its page as UTF-8. That is, server responses have header:

Content-type: text/html;charset=UTF-8 

Now within this application there is a single page that should be served with ISO-8859-1 encoding. That is, server response should have this header:

Content-type: text/html;charset=ISO-8859-1 

How to do this? I don’t want to change default encoding for whole application.

Based on google searching I have tried following:

 @Meta({    'org.apache.tapestry.output-encoding=ISO-8859-1',      'org.apache.tapestry.response-encoding=ISO-8859-1',      'org.apache.tapestry.template-encoding=ISO-8859-1',     'tapestry.response-encoding=ISO-8859-1'})  abstract class MyPage extends BasePage {      @Override     protected String getOutputEncoding() {         return 'ISO-8859-1';     }  } 

But neither setting those values with @Meta annotation or overriding getOutputEncoding method works.

I am using Tapestry 4.0.2.

EDIT: I ended up doing this with a Servlet filter with subclassed HttpServletResposeWrapper. The wrapper overrides setContentType() to force required encoding for the response.

Answer 1

Have you considered a Filter? Maybe not as elegant as something within Tapestry, but using a plain Filter, that registers the url mapping(s) of interest. One of its init parameters would be the encoding your after. Example:

public class EncodingFilter implements Filter { private String encoding; private FilterConfig filterConfig;  /** * @see javax.servlet.Filter#init(javax.servlet.FilterConfig) */ public void init(FilterConfig fc) throws ServletException { this.filterConfig = fc; this.encoding = filterConfig.getInitParameter('encoding'); }  /** * @see javax.servlet.Filter#doFilter(javax.servlet.ServletRequest, javax.servlet.ServletResponse, javax.servlet.FilterChain) */ public void doFilter(ServletRequest req, ServletResponse resp, FilterChain chain) throws IOException, ServletException { req.setCharacterEncoding(encoding); chain.doFilter(req, resp); }  /** * @see javax.servlet.Filter#destroy() */ public void destroy() { }  }