EDIT

package eu.etaxonomy.cdm.remote.view;

import java.io.File;

import java.util.ArrayList;

import java.util.Map;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import org.apache.commons.io.FileUtils;

import org.apache.log4j.Logger;

import org.json.CDL;

import org.json.JSONArray;

import org.json.JSONObject;

import org.springframework.web.servlet.View;

/**

 * This class is a generic approach to generate a csv output from POJOs.

 * Yet there will be a problem with multidimensional structures. It is 

 * recommended to flatten these out before handing your data over to this

 * view.

 * <p>

 *<b>This is a experimental class, can be changed in the future</b>

 * 

 * 

 * @author a.oppermann

 *

 */

public class CsvFileDownloadView implements View{

	private File file;

	Logger logger = Logger.getLogger(CsvFileDownloadView.class);

	/**

	 * 

	 * @param file

	 */

	public CsvFileDownloadView(File file){

		this.file = file;

	}

	@Override

	public String getContentType() {

		return null;

	}

	@Override

	public void render(Map<String, ?> model, HttpServletRequest request,

			HttpServletResponse response) throws Exception {

        ArrayList<?> list = (ArrayList<?>) model.get("csv");

        JSONObject obj;

        JSONObject result = new JSONObject();

        for(Object o : list){

        	obj = new JSONObject(o);

        	result.append("records", obj);

        }

        JSONArray ja = result.getJSONArray("records");

        String csv = CDL.toString(ja);

        File file = getFile();

		FileUtils.write(file, csv);

	}

	public File getFile() {

		return file;

	}

	public void setFile(File file) {

		this.file = file;

	}

}