goja-web/src/main/java/goja/mvc/csv/CsvUtil.java
public static void createCol(StringBuffer strOut, Object obj) {
        if (obj != null) {
            strOut.append(QUOTE);
            String content;

            if (obj instanceof Boolean) {
                content = obj.toString();
            } else if (obj instanceof Calendar) {
                content = obj.toString();
            } else if (obj instanceof Timestamp) {
                content = DP_YYYY_MM_DD_HH_MM.format(new Date(((Timestamp) obj).getTime()));
            } else if (obj instanceof Date) {
                content = DP_YYYY_MM_DD_HH_MM.format((Date) obj);
            } else {
                content = write(String.valueOf(obj));
            }
            strOut.append(content);
            strOut.append(QUOTE);
        } else {
            strOut.append("\" \" ");
        }
    }
public static void createCol(StringBuffer strOut, Object obj) {
        if (obj != null) {
            strOut.append(QUOTE);
            String content;

            if (obj instanceof Boolean) {
                content = obj.toString();
            } else if (obj instanceof Calendar) {
                content = obj.toString();
            } else if (obj instanceof Timestamp) {
                content = DP_YYYY_MM_DD_HH_MM.format(new Date(((Timestamp) obj).getTime()));
            } else if (obj instanceof Date) {
                content = DP_YYYY_MM_DD_HH_MM.format((Date) obj);
            } else {
                content = write(String.valueOf(obj));
            }
            strOut.append(content);
            strOut.append(QUOTE);
        } else {
            strOut.append("\" \" ");
        }
    }
把单个元素转化