原来写过一篇文章,是介绍EasyExcel的,但是现在有些业务需要解决,流程如下
1.需要把导出条件转换成中文并存入数据库
2.需要分页导出
3.需要上传FTP或者以后上传OSS
解决方案
大体的流程采用摸板方法模式,这样简化条件转换以及上传FTP操作
public abstract class EasyExcelUtil {
private final Logger logger = LoggerFactory.getLogger(this.getClass());
private final CloudOrderManagementDao cloudOrderManagementDao;
//上下文对象
private final ExportDTO dto;
//ftp信息
private final FileClient fileClient;
protected final RedisUtil redisUtil;
private static final ThreadPoolExecutor threadPoolExecutor = new ThreadPoolExecutor(10, 30,
60L, TimeUnit.SECONDS, new ArrayBlockingQueue<>(100));;
/**
* 构造方法子类必须实现
*
* @param cloudOrderManagementDao dao
* @param dto 上下文对象
* @param fileClient 文件上传对象
* @param redisUtil redis
*/
public EasyExcelUtil(CloudOrderManagementDao cloudOrderManagementDao, ExportDTO dto, FileClient fileClient, RedisUtil redisUtil) {
this.cloudOrderManagementDao = cloudOrderManagementDao;
this.dto = dto;
this.fileClient = fileClient;
this.redisUtil = redisUtil;
}
/**
* 主方法
*/
public final void createExcel() {
try {
File file = this.createFile();
CloudExportInfo exportInfo = this.createExportInfo(file.getName());
threadPoolExecutor.execute(() -> {
this.easyCreate(file);
this.uploadFile(file);
updateExportInfo(exportInfo);
});
} catch (Exception e) {
logger.error("ExcelUtil error{}", e);
}
}
/**
* 创建文件
*
* @return 文件对象
* @throws IOException
*/
private File createFile() throws IOException {
File temp = File.createTempFile("temp", ".xlsx");
logger.info("ExcelUtil创建文件成功{}", temp.getAbsolutePath());
return temp;
}
/**
* 创建导出对象,并存数据库
*
* @param fileName 文件名
* @return 导出对象
*/
private CloudExportInfo createExportInfo(String fileName) {
CloudExportInfo exportInfo = new CloudExportInfo();
exportInfo.setId(dto.getUuid());
exportInfo.setUserId(dto.getUserId());
exportInfo.setCreateBy(dto.getUserName());
exportInfo.setExportStatus(com.blgroup.vision.common.utils.R.CloudConstant.TWO);
exportInfo.setExportType(dto.getExportType());
exportInfo.setQueryParam(this.transitionQuery());
exportInfo.setExportCount(dto.getTotal());
exportInfo.setFileName(fileName);
exportInfo.setExportDir(dto.getBasisDir() + File.separator + fileName);
cloudOrderManagementDao.saveExportInfo(exportInfo);// 初始化导出信息
redisUtil.set(R.CloudConstant.CLOUD_DOWNLOAD_PROGRESS + "_" + dto.getUuid(), "5", 60 * 5);
logger.info("ExcelUtil创建导出信息成功{}", JSON.toJSONString(exportInfo));
return exportInfo;
}
/**
* 上传文件
*
* @param file 文件,策略模式 未来可能支持OSS
*/
private void uploadFile(File file) {
redisUtil.set(R.CloudConstant.CLOUD_DOWNLOAD_PROGRESS + "_" + dto.getUuid(), "95", 60 * 5);
fileClient.uploadFile(file, dto.getBasisDir());
redisUtil.set(R.CloudConstant.CLOUD_DOWNLOAD_PROGRESS + "_" + dto.getUuid(), "100", 60 * 5);
}
/**
* 上传完成,更新导出对象
*
* @param exportInfo
* @return
*/
private CloudExportInfo updateExportInfo(CloudExportInfo exportInfo) {
exportInfo.setExportStatus(com.blgroup.vision.common.utils.R.CloudConstant.ONE);
cloudOrderManagementDao.saveExportInfo(exportInfo);// 初始化导出信息
logger.info("ExcelUtil上完成");
return exportInfo;
}
/**
* 导出方法,可以实现分批导出,也可以一次性导出
*
* @param file 文件
*/
public abstract void easyCreate(File file);
/**
* 对查询字段进行转换
* @return
*/
public abstract String transitionQuery();
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}
这样子类只需要实现easyCreate和transitionQuery方法即可
查询条件转换
针对查询条件转换,例如QO字段为’merchantId’ 需要转换为商户值需要转换为ID对应的商户名称
如果是每个导出方法写一段转换类太麻烦这里使用注解的方式
在属性上使用表明中文意思和转换方法
@Target({ElementType.FIELD})
@Retention(RetentionPolicy.RUNTIME)
@Inherited
@Documented
public @interface FieldNameTransition {
/**
* 中文名称
* @return
*/
String value();
String transitionMethod() default "";
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}
指定转换类
@Target({ElementType.TYPE})
@Retention(RetentionPolicy.RUNTIME)
@Inherited
@Documented
/**
- 指定转换类
*/
public @interface TransitionClass {
Class<?> value();
}
通过反射进行转换
public class ExcelTransitionFieldUtil {
public static Logger logger = LoggerFactory.getLogger(ExcelTransitionFieldUtil.class);
private final ApplicationContext applicationContext;
public ExcelTransitionFieldUtil(ApplicationContext applicationContext) {
this.applicationContext = applicationContext;
}
public String transition(Object object) {
List<Map<String, String>> resultList = new ArrayList<>();
Object transitionBean = null;
//获取传过来的对象
Class<?> dtoClass = object.getClass();
if (dtoClass.isAnnotationPresent(TransitionClass.class)) {
//获取类上的注解,得到转换类 获取spring ioc中转换类的对象
transitionBean = applicationContext.getBean(dtoClass.getAnnotation(TransitionClass.class).value());
}
//获取对象的全部字段
Field[] fields = dtoClass.getDeclaredFields();
for (Field field : fields) {
if (field.isAnnotationPresent(FieldNameTransition.class)) {
field.setAccessible(true);
//获取字段中需要转换的注解
try {
if (field.get(object) != null && StringUtils.isNotBlank(field.get(object).toString())) {
FieldNameTransition fieldAnnotation = field.getAnnotation(FieldNameTransition.class);
Map<String, String> tempMap = new HashMap<>();
tempMap.put("name", fieldAnnotation.value());
//如果定义了转换方法
if (StringUtils.isNotBlank(fieldAnnotation.transitionMethod()) && transitionBean != null) {
Method method = transitionBean.getClass().getMethod(fieldAnnotation.transitionMethod(), dtoClass);
Object invoke = method.invoke(transitionBean, object);
tempMap.put("value", invoke.toString());
} else {
tempMap.put("value", field.get(object).toString());
}
resultList.add(tempMap);
}
}catch (Exception e){
logger.error("反射转换发生异常 {}", e);
}
}
}
return JSON.toJSONString(resultList);
}
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}
使用
QueryMerchantExportQO queryDTO = QueryMerchantExportQO.builder()
.isNeedAudit(request.getParameter(“isNeedAudit”))
.keyword(request.getParameter(“keyword”))
.merchantType(request.getParameter(“merchantType”))
.shopId(request.getParameter(“shopId”))
.storeCode(request.getParameter(“storeCode”))
.storeType(request.getParameter(“storeType”))
.hideFlag(request.getParameter(“hideFlag”)).build();
ExportDTO exportDTO = ExportDTO.builder().userId(UserUtils.getUser().getId())
.userName(UserUtils.getUser().getName())
.exportType(“9”)
.uuid(UUID.randomUUID().toString())
.basisDir("/cloudDownFile" + File.separator + LocalDate.now().getYear() + File.separator + LocalDate.now().getMonth().getValue())
.total(Integer.valueOf(request.getParameter(“total”)))
.build();
FtpInfo ftpInfo = new FtpInfo(server, uname, pwd, port);
new EasyExcelUtil(cloudOrderManagementDao, exportDTO, new FtpFileClient(ftpInfo), redisUtil) {
@Override
public void easyCreate(File file) {
//do something
}
@Override
public String transitionQuery() {
//转换
return new ExcelTransitionFieldUtil(applicationContext).transition(queryDTO);
}
}.createExcel();
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}