问如何在DispatchAction类的execute方法中获取响应文本

EN

public class WrappingFilter implements Filter
{
    private static final ThreadLocal<StringBuilder> contentBuffer = new ThreadLocal<>();

    @Override
    public void init(final FilterConfig filterConfig) throws ServletException
    {

    }

    @Override
    public void doFilter(final ServletRequest request, final ServletResponse response, final FilterChain chain)
        throws IOException, ServletException
    {
        contentBuffer.set(new StringBuilder());
        chain.doFilter(request, new ContentBufferingResponseWrapper(response));
        contentBuffer.remove();
    }

    @Override
    public void destroy()
    {

    }

    public static StringBuilder getResponse()
    {
        return contentBuffer.get();
    }

    private class ContentBufferingResponseWrapper extends ServletResponseWrapper
    {
        public ContentBufferingResponseWrapper(final ServletResponse response)
        {
            super(response);
        }

        @Override
        public PrintWriter getWriter() throws IOException
        {
            return new PrintWriter(super.getWriter())
            {
                @Override
                public void write(final String s, final int off, final int len)
                {
                    contentBuffer.get().append(s);
                    super.write(s, off, len);
                }
            };
        }
    }
}