com.berwickheights.spring.svc.GenEmailMsgSvcImpl.java Source code

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Here is the source code for com.berwickheights.spring.svc.GenEmailMsgSvcImpl.java

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/*
 * Copyright 2009 Berwick Heights Software, Inc
 * 
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in 
 * compliance with the License. You may obtain a copy of the License at 
 * http://www.apache.org/licenses/LICENSE-2.0 
 * 
 * Unless required by applicable law or agreed to in writing, software distributed under the License is 
 * distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 
 * See the License for the specific language governing permissions and limitations under the License.
 *  
 */

package com.berwickheights.spring.svc;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;

import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import com.berwickheights.spring.utils.RedirectingServletResponse;

public class GenEmailMsgSvcImpl implements GenEmailMsgSvc {
    private final Log logger = LogFactory.getLog(this.getClass());

    public String genEmailMsgFromJSP(HttpServletRequest request, HttpServletResponse response, String jspPagePath,
            Map<String, Object> extraPageArgs) throws IOException, ServletException {
        Map<String, Object> args = new HashMap<String, Object>();

        // Add extra arguments if provided
        if (extraPageArgs != null) {
            for (String key : extraPageArgs.keySet()) {
                args.put(key, extraPageArgs.get(key));
            }
        }

        // Set up data for jsp/jstl template
        request.setAttribute("args", args);

        // Create an output stream
        ByteArrayOutputStream baos = new ByteArrayOutputStream();

        // Create the "dummy" response object
        RedirectingServletResponse dummyResponse;
        dummyResponse = new RedirectingServletResponse(response, baos);

        // Get a request dispatcher for the email msg body to load
        RequestDispatcher rd = request.getRequestDispatcher(jspPagePath);

        // Execute JSP
        rd.include(request, dummyResponse);

        //
        // Get email message body
        // NB: JSP page must have "out.flush()" at end of file to flush Tomcat buffers
        // so that ByteArrayOutputStream (baos) will contain the mail message text
        //
        dummyResponse.flushBuffer();
        String emailText = baos.toString();
        baos.close();

        if (logger.isDebugEnabled()) {
            logger.debug("Generated message: " + emailText);
        }

        return emailText;
    }
}