Interceptor to append JSP location to outputted html by struts2, for development or debug only.

config

    <interceptors> 
      <interceptor name="jspLocationInterceptor" 
        class="com.fml.java.struts2.interceptor.JSPLocationInterceptor"/>  
      <interceptor-stack name="myStack">
        <interceptor-ref name="defaultStack"/>
        <interceptor-ref name="jspLocationInterceptor" >
          <param name="includeMethods">*</param>
          <param name="excludeViews">someJSP.jsp</param>
        </interceptor-ref>
      </interceptor-stack>
    </interceptors> 
    
    <default-interceptor-ref name="myStack"/>

JSPLocationInterceptor.java

package com.fml.java.struts2.interceptor;

import java.io.CharArrayWriter;
import java.io.PrintWriter;
import java.util.*;

import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpServletResponseWrapper;

import org.apache.commons.lang.StringUtils;
import org.apache.log4j.Logger;
import org.apache.struts2.ServletActionContext;
import org.apache.struts2.dispatcher.ServletDispatcherResult;

import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionInvocation;
import com.opensymphony.xwork2.interceptor.Interceptor;

public class JSPLocationInterceptor implements Interceptor {

  private static final long serialVersionUID = -2077919479128101204L;
  
	protected static final Logger LOGGER = Logger.getLogger(JSPLocationInterceptor.class);
	
	private String excludeViews;
	
	private Set<String> excludeViewsList;

	@Override
	public void destroy() {
		// TODO Auto-generated method stub

	}

	@Override
	public void init() {
		LOGGER.info(getExcludeViews());
		excludeViewsList = new HashSet<String>();
		if (StringUtils.isNotEmpty(getExcludeViews())) {			
			excludeViewsList.addAll(Arrays.asList(getExcludeViews().split(",")));
		}
	}

	@Override
	public String intercept(ActionInvocation invocation) throws Exception {
		final ActionContext context = invocation.getInvocationContext();
		HttpServletResponse response = (HttpServletResponse) context.get(
			ServletActionContext.HTTP_RESPONSE);
		CharResponseWrapper wrapper = new CharResponseWrapper(response);

		ServletActionContext.setResponse(wrapper);

		// Actual Action called
		String result = invocation.invoke();
		
		String htmlReturned = wrapper.toString();
		if (invocation.getResult() instanceof ServletDispatcherResult) {
        	ServletDispatcherResult r = (ServletDispatcherResult)invocation.getResult();
        	if (StringUtils.isNotEmpty(r.getLastFinalLocation())) {
        		int index = r.getLastFinalLocation().lastIndexOf("/");
        		if (index == -1 || !excludeViewsList.contains(
        			r.getLastFinalLocation().substring(index + 1))) {
            		htmlReturned = htmlReturned + "<br/><strong>JSP location: " + 
            		               r.getLastFinalLocation() + "</strong>";
            	}
        	}        	
        }
		PrintWriter out = response.getWriter();
		out.write(htmlReturned);
		out.flush();
		
		return result;
	}
	
	public String getExcludeViews() {
		return excludeViews;
	}

	public void setExcludeViews(String excludeViews) {
		this.excludeViews = excludeViews;
	}

}

class CharResponseWrapper extends HttpServletResponseWrapper {
    private CharArrayWriter output;

    public CharResponseWrapper(HttpServletResponse response) {
        super(response);
        this.output = new CharArrayWriter();
    }

    public String toString() {
        return output.toString();
    }

    public PrintWriter getWriter() {
        return new PrintWriter(output);
    }
}