JAVA 导出CSV文件，不存在则新建，存在则追加

朴灿烈づ我的快乐病毒、 2021-09-22 00:24 468阅读 0赞

网上有很多教程，都是什么乱七八糟的。还是自己写的舒服

/** * @param path 路径 * @param fileName 文件名 * @param headList 表头列表 * @param dataList 数据列表 */
        public static void createCSV(String path, String fileName, List<String> headList, List<List<String>> dataList) { 
            try { 
                fileName = path + fileName + EXT_CSV;
                File file = new File(fileName);
                if (Objects.nonNull(file.getParentFile()) && !file.getParentFile().exists()) { 
                    if (!file.getParentFile().mkdirs()){ 
                        log.info("file create fail! | {}", fileName);
                    }
                }
                FileOutputStream fos;
                CSVFormat csvFormat;
                if (file.exists()) { 
                    fos = new FileOutputStream(file, true);
                    csvFormat = CSVFormat.DEFAULT;
                } else { 
                    if (!file.createNewFile()){ 
                        log.info("file create fail! | {}", fileName);
                    }
                    fos = new FileOutputStream(file);
                    String[] headArray = headList.toArray(new String[0]);
                    csvFormat = CSVFormat.DEFAULT.withHeader(headArray).withAllowDuplicateHeaderNames();
                }
                OutputStreamWriter osw = new OutputStreamWriter(fos, "GBK");
                CSVPrinter csvPrinter = new CSVPrinter(osw, csvFormat);
                for (List<String> data : dataList) { 
                    csvPrinter.printRecord(data);
                }
                csvPrinter.flush();
                csvPrinter.close();
            } catch (Exception e) { 
                log.info("导出CSV文件失败 fileName {}", fileName);
            }
        }