java将数据生成csv文件

1，httpRequest接口触发进程[或者可以换成其他方式触发]

/**
 * 出入库生成CSV文件
 * @param req
 * @param params
 * @return
 */
@RequestMapping(value = "explanCsvFileToOrder")
ResponseMessage explanCsvFileToOrder(HttpServletRequest req, @RequestParam Map<String, String> params) {
    TtxSession sess = getSession(req, params.customer)
    ResponseMessage rsp
    rsp = validate(sess, params)
    if (!rsp.hasError()) {
        rsp = excfSvc.explanCsvToShipAndRece(sess,params.warehouseCode)
    }
    return rsp
}

    /**
     * scheduler_SHIPANDRECE
     * @param sess
     * @param warehouseCode
     * @return
     */
    ResponseMessage explanCsvToShipAndRece(TtxSession sess, String warehouseCode) {
        ResponseMessage rsp = ResponseMessageFactory.success(sess, null)
        try {
            //读取全局大文档，找到数据执行的SQL
            List invSQLS = template(sess).queryForList("select textValue from large_text where warehouseCode='*' and type='CSV_FILE_SQL' and code='CSV_SHIPANDRECE'")
            if (!invSQLS) {
                return ResponseMessageFactory.error(sess, "未查询到单据条件SQL")
            }
            //找到存储路径
            List filePath = template(sess).queryForList("select value from config_value where warehouseCode=? and  identifier='CSVFILEPATH'", warehouseCode)
//        String path = "c:/export/"
            if (!filePath) {
                return ResponseMessageFactory.error(sess, "未查询到存储路径")
            }
            //定义文件存储路径
            String path = filePath[0]["value"].toString()
            //定义命名格式
            String fileName = "OrderData-" + LocalDateTime.now().format(dtf)
            String invSql = invSQLS[0]["textValue"].toString()
            //查询出来数据
            List locInv = template(sess).queryForList(invSql)

            List<Object> exportData = new ArrayList<Object>()
            //给csv文件添加标题
            exportData.add("DHLWarehouseNo")
            exportData.add("StorageNo")
            exportData.add("RelatedOrderNo")
            exportData.add("ActualWarehouseTime")
            exportData.add("SpareColumn1")
            exportData.add("SpareColumn2")
            exportData.add("LoadNo")
            exportData.add("InventoriesAmount")
            exportData.add("MaterialExpiryDate")
            exportData.add("Department")
            exportData.add("MaterialState")
            List<List<Object>> datalist = new ArrayList<List<Object>>()
            List<Object> data
            //循环添加数据主体
            locInv?.each {
                data = new ArrayList<Object>()
                data.add(it.CODE)
                data.add(it.WarehouseNo)
                data.add(it.deliveryNo)
                data.add(it.lastUpdated)
                data.add(it.SpareColumn1)
                data.add(null)
                data.add(it.skuCode)
                data.add(it.quantity)
                data.add(it.materialExpiryDate)
                data.add(it.department)
                data.add(it.inventorySts)
                datalist.add(data)
            }

            //创建文件
            File file = this.createCSVFile(exportData, datalist, path, fileName)
            String fileName2 = file.getName()
            System.out.println("文件名称：" + fileName2)
        } catch (Throwable t) {
            ExceptionManager.logException(sess, t)
            return ResponseMessageFactory.error(sess, WmsMessages.MSG_GNRL_0000)
        }
        return rsp
    }

/**
 * 生成CSV文件的主体方法
 * @param head
 * @param dataList
 * @param outPutPath
 * @param filename
 * @return
 */
public static File createCSVFile(List<Object> head, List<List<Object>> dataList, String outPutPath, String filename) {
    File csvFile = null
    BufferedWriter csvWtriter = null
    try {
        csvFile = new File(outPutPath + File.separator + filename + ".csv")
        File parent = csvFile.getParentFile()
        if (parent != null && !parent.exists()) {
            parent.mkdirs()
        }
        csvFile.createNewFile()

        // GB2312使正确读取分隔符","
        csvWtriter = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(
                csvFile), "GB2312"), 1024)
        // 写入文件头部
        writeRow(head, csvWtriter)

        // 写入文件内容
        for (List<Object> row : dataList) {
            writeRow(row, csvWtriter)
        }
        csvWtriter.flush()
    } catch (Exception e) {
        e.printStackTrace()
    } finally {
        try {
            csvWtriter.close()
        } catch (IOException e) {
            e.printStackTrace()
        }
    }
    return csvFile
}

private static void writeRow(List<Object> row, BufferedWriter csvWriter) throws IOException {
    // 写入文件头部
    for (Object data : row) {
        StringBuffer sb = new StringBuffer()
        String rowStr = sb.append("\"").append(data).append("\",").toString()
        csvWriter.write(rowStr)
    }
    csvWriter.newLine()
}