@Test
@DisplayName("IO流工具-IoUtil")
public void ioUtilTest() {
    // 读取磁盘文件
    File file1 = new File("D:/test1.txt");
    File file2 = new File("D:/test2.txt");
    // 获取文件读取字符流
    InputStream in1 = FileUtil.getInputStream(file1);
    InputStream in2 = FileUtil.getInputStream(file2);
    List<String> listText1 = new ArrayList<>();
    List<String> listText2 = new ArrayList<>();
    try {
        // 可指定字符集编码读取流中内容
        IoUtil.readLines(in1, StandardCharsets.UTF_8, listText1);
        // 固定以UTF-8字符集编码读取流中内容
        IoUtil.readUtf8Lines(in2, listText2);
    } catch (Exception e) {
        log.error("读取文件内容失败", e);
    } finally {
        // 关闭流
        IoUtil.close(in1);
        IoUtil.close(in2);
    }
    log.info("test1.text 内容: {}", listText1);
    log.info("test2.text 内容: {}", listText2);
}

@Slf4j
@Component
@RequiredArgsConstructor
public class PostConstructInitUtil {

    private final CustomizeQuarterReportMapper quarterReportMapper;
    public static BiMap<String, String> regionMap = new BiMap<>(new HashMap<>());
    
    @PostConstruct
    public void run() {
        List<LkpRegionVO> regions = quarterReportMapper.getRegions();
        if (ObjectUtil.isEmpty(regions)) {
            log.error("初始化regionMap失败！");
        }
        regions.forEach(r -> regionMap.put(r.getRegion(), r.getRegionSnm()));
        log.info("初始化regionMap成功, size = {} ！", regionMap.size());
    }
}