Actually it could be implemented with wrapper

/**
 * 
 * Get generated page body as String.
 * Using :
 *
 *  
 *  JspResponseWrapper my = new JspResponseWrapper(response) ;
 *  request.getRequestDispatcher( request.getContextPath() + "/index.jsp" 
).include(request, my);
 *  String body = my.getBody() ;
 *  
 *  
 */



public class JspResponseWrapper extends 
javax.servlet.http.HttpServletResponseWrapper {

 StringWriter sw  ;

 public JspResponseWrapper(javax.servlet.http.HttpServletResponse response) {
    super(response) ;
    sw = new StringWriter() ;
 }

  public PrintWriter getWriter() throws IOException {
   PrintWriter pw = new PrintWriter(sw) ;
   return pw ;
  }

  public String getBody() {
    return sw.toString() ;
  }

}


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