java 创建csv通用接口；适合各种类

        Object o = datas.get(0);
        String objName = o.getClass().getSimpleName();
        DateFormat dateFormat = new SimpleDateFormat("yyyyMMddHHmmss");
        String csvFilePath = filePath + objName + dateFormat.format(new Date()) + ".csv";
        File file = new File(csvFilePath);
        if (!file.exists() && !file.isDirectory()) {
            file.mkdirs();
        }
        //构造头部数据
        String[] title = ObjectTransferUtils.generateObjAttr(o);
        CSVFormat csvFormat = CSVFormat.DEFAULT.withHeader(title);
        OutputStreamWriter ouputStream = new OutputStreamWriter(out, "GBK");
        CSVPrinter printer = new CSVPrinter(ouputStream, csvFormat);
        for (int i = 0; i < datas.size(); i++) {
            Object obj = datas.get(i);
            String[] titl = ObjectTransferUtils.generateObjAttr(obj);
            Object[] value = new Object[titl.length];
            for (int t = 0; t < titl.length; t++) {
                if (titl[t] == null) {
                    continue;
                }
                value[t] = ObjectTransferUtils.generateAttrValue(titl[t], obj);
            }
            printer.printRecord(value);
        }