opencsv 对文件的读写

/**
 * 
 * CSV文件导出工具类
 * 
 * Created on 2014-08-07
 * @author 
 * @reviewer 
 */
public class CsvUtils {

    /**
     * CSV文件生成方法
     * @param head
     * @param dataList
     * @param outPutPath
     * @param filename
     * @return 
     * @return
     */
    public static  void createCSVFile( LinkedHashMap fieldMap,List list,
    		 HttpServletResponse response) {        
     // 设置默认文件名为当前时间：年月日时分秒
        String fileName = new SimpleDateFormat("yyyyMMddhhmmss").format(new Date()).toString();

        // 设置response头信息
        response.reset();
        response.setContentType("application/vnd.ms-excel"); // 改成输出excel文件
        response.setHeader("Content-disposition", "attachment; filename=" + fileName + ".csv");
        OutputStream out = null;
        try {
        	out=response.getOutputStream();
            List