Mongo数据bson转json

系统在第一次运行时，需要初始化一些数据到mongoDB中，初始化数据是从源库导出的json，里面有字符不是标准的如"$oid"， "$date"等，需要转成正常的java对象然后插入库。

jsonWriterSettings = JsonWriterSettings.builder().outputMode(JsonMode.RELAXED)
                .dateTimeConverter(new JsonDateTimeConverter()).objectIdConverter(new ObjectIdConverter()).build();


private <T extends Entity> List<T> initData(String fileName, Class<T> entityClass) {
        try (InputStream resourceAsStream = this.getClass().getResourceAsStream("/script/" + fileName)) {
            List<T> entities = new ArrayList<>();
            for (String readLine : IOUtils.readLines(resourceAsStream, StandardCharsets.UTF_8)) {
                Document parse = Document.parse(readLine);
                entities.add(JSONUtil.read(parse.toJson(jsonWriterSettings), entityClass));
            }
            return entities;
        } catch (IOException e) {
            log.error("初始化报错", e);
            return Collections.emptyList();
        }
    }

参考：https://www.baeldung.com/java-convert-bson-to-json