文章目录
- 浏览器下载json文件
- 浏览器下载excel文件【Workbook】
- 浏览器导入json文件【ObjectMapper】
- 浏览器导入excel文件【Workbook】
- ResourceLoader读取类路径下单个json
- ResourceLoader读取类路径下所有json文件
浏览器下载json文件
java
@Operation(summary = "设备模型导出(带分组)")
@PostMapping("/export")
public void exportWithGroup(HttpServletRequest request, HttpServletResponse response) {
var user = SecurityUtils.getCurrentUser();
bizTypeService.exportWithGroup(request, response, user);
}
@Override
public void exportWithGroup(HttpServletRequest request, HttpServletResponse response, SecurityUser user) {
// 1. 导出的数据
ExportDto exportDto = new ExportDto();
exportDto.setTypes(types);
exportDto.setGroups(groups);
// 2. 下载
PrintWriter writer = null;
try {
response.setContentType("application/octet-stream");
response.setCharacterEncoding("utf-8");
response.setHeader("content-disposition", "download;filename*=utf-8''" + URLEncoder.encode("device_model_type.json", "UTF-8"));
writer = response.getWriter();
writer.write(JacksonUtils.writeValueAsString(exportDto)); // 转成string
} catch (Exception e) {
throw new RuntimeException(e);
} finally {
writer.close();
}
}浏览器下载excel文件【Workbook】
详见ExcelUtils
java
@Override
public void exportRunningRecords(
HttpServletRequest request, HttpServletResponse response) {
// 1. 查询数据
List<RunningRecordsDto> data = resultDto.getItems();
// 2. 导出数据
List<String> headers = new ArrayList<>();
headers.add("设备名称");
headers.add("设备编号");
headers.add("所属模型");
headers.add("安装位置");
headers.add("服务范围");
headers.add("运行次数");
headers.add("运行时长");
List<List<Object>> dataList = new ArrayList<>();
for (RunningRecordsDto item : data) {
List<Object> list = new ArrayList<>();
list.add(item.getName());
list.add(item.getCode());
list.add(item.getTypeName());
list.add(item.getLocationName());
list.add(item.getServiceArea());
list.add(item.getCounts());
list.add(item.getDuration());
dataList.add(list);
}
try {
// 最后一个参数说明
// false: 普通excel文件，无任何格式
// true: excel文件第一行为黄色背景，最后一列字体为红色
ExcelUtils.generateCreateExcel(headers, dataList, "设备运行记录.xlsx", request, response, true);
} catch (Exception e) {
log.error("设备运行记录导出异常", e);
}
}
java
public class ExcelUtils {
/**
* 导出最精简的excel.
*
* @param headers (不是必填) excel头列 比如: 姓名 年龄 性别 ..
* @param datas (必填) 数据列(请确保和列的顺序保持一致)
* @param fileName 生成excel的文件名称，如果不传则默认为随机生成
* @param request HttpServletRequest
* @param response HttpServletResponse
* @param isCustomStyle 是否自定义样式
* @throws IOException io异常
*/
public static void generateCreateExcel(List<String> headers, List<List<Object>> datas, String fileName,
HttpServletRequest request, HttpServletResponse response, Boolean isCustomStyle) throws Exception {
Workbook workbook = generateWorkBook(headers, datas, isCustomStyle);
// 文件名处理一下
//设置编码
fileName = new String(((StringUtils.isBlank(fileName) ? UUID.randomUUID().toString() : fileName) + "."
+ XSSFWorkbookType.XLSX.getExtension()).getBytes("UTF-8"), "ISO-8859-1");
String userAgent = request.getHeader("User-Agent");
if (userAgent.toUpperCase().contains("MSIE") || userAgent.toUpperCase().contains("RV:11")) {
fileName = URLEncoder.encode(fileName, StandardCharsets.UTF_8.displayName());
} else {
fileName = new String(fileName.getBytes(StandardCharsets.UTF_8), StandardCharsets.ISO_8859_1);
}
response.reset(); // 清空response
response.setContentType(HttpHeaderEnum.FILE_DOWNLOAD_XLSL.getValue());
response.setHeader("content-disposition", "attachment;filename=" + fileName);
response.setCharacterEncoding("UTF-8");
// 文件流输出
try {
workbook.write(response.getOutputStream());
} catch (IOException e) {
throw new IOException("could not write to response. cause: ", e);
} finally {
if (workbook != null) {
workbook.close();
}
}
}
/**
* 生成一个workbook.
*
* @param headers (不是必填) excel头列 比如: 姓名 年龄 性别 ..
* @param data 数据列(请确保和列的顺序保持一致)
* @param isCustomStyle 是否自定义样式
* @return workbook对象
*/
public static Workbook generateWorkBook(List<String> headers, List<List<Object>> data, Boolean isCustomStyle) {
XSSFWorkbook book = null;
// 先创建一发book,并建一个sheet
book = new XSSFWorkbook();
XSSFSheet sheet = book.createSheet();
CellStyle cellStyle1 = book.createCellStyle();
CellStyle cellStyle2 = book.createCellStyle();
if (isCustomStyle) {
// 设置第一行背景颜色为黄色
cellStyle1.setFillForegroundColor(IndexedColors.YELLOW.getIndex());
cellStyle1.setFillPattern(FillPatternType.SOLID_FOREGROUND);
// 设置最后一列字体为红色
Font font = book.createFont();
font.setColor(IndexedColors.RED.getIndex());
cellStyle2.setFont(font);
cellStyle2.setAlignment(HorizontalAlignment.LEFT);
cellStyle2.setVerticalAlignment(VerticalAlignment.CENTER);
}
// 设置自适应列宽
List<Integer> maxCalls = getMaxCall(headers, data);
for (int i = 0, j = maxCalls.size(); i < j; i++) {
// 最大列宽设置
if (maxCalls.get(i) > 30) {
sheet.setColumnWidth(i, 30 * 256);
} else {
sheet.setColumnWidth(i, maxCalls.get(i) * 256);
}
}
// 是否有头，如果有则先把表头建好
if (CollectionUtils.isNotEmpty(headers)) {
// 创建第一行，表头行
XSSFRow titleRow = sheet.createRow(0);
XSSFCell titleCell = null;
XSSFRichTextString titleText = null;
// 把表头放到第一个行里面
for (int i = 0; i < headers.size(); i++) {
titleCell = titleRow.createCell(i);
// 给创建的单元格里面设值
titleText = new XSSFRichTextString(headers.get(i));
titleCell.setCellValue(titleText);
if (isCustomStyle) {
titleRow.getCell(i).setCellStyle(cellStyle1);
}
}
}
// 处理内容
if (CollectionUtils.isNotEmpty(data)) {
// 如果有列表头则row重1开始。否则重0开始
int dataRowIdx = CollectionUtils.isNotEmpty(headers) ? 1 : 0;
XSSFRow dataRow = null;
XSSFCell dataCell = null;
List<Object> dataList = null;
// 开始处理行和单元格
for (int i = 0; i < data.size(); i++) {
// 创建内容的行
dataRow = sheet.createRow(i + dataRowIdx);
dataList = data.get(i);
// 将内容放到对应的行中
for (int j = 0; j < dataList.size(); j++) {
// 有多少个内容就有多少个单元格
dataCell = dataRow.createCell(j);
// 设值单元格的值
setValue(book, sheet, dataCell, dataList.get(j));
}
}
}
if (isCustomStyle) {
int lastColumnIndex = headers.size() - 1;
for (int i = 0; i <= sheet.getLastRowNum(); i++) {
XSSFRow row = sheet.getRow(i);
if (row != null) {
XSSFCell cell = row.getCell(lastColumnIndex);
if (cell != null) {
cell.setCellStyle(cellStyle2);
}
}
}
}
return book;
}浏览器导入json文件【ObjectMapper】
java
@Operation(summary = "设备模型导入(带分组)")
@PostMapping("/import")
public ApiResultDto<BizTypeImportResDto> importWithGroup(MultipartFile file) {
var user = SecurityUtils.getCurrentUser();
return bizTypeService.importWithGroup(file, user);
}
@Override
@Transactional(rollbackFor = Exception.class)
public ApiResultDto<BizTypeImportResDto> importWithGroup(MultipartFile file, SecurityUser user) {
// 1. 读取文件内容
ObjectMapper objectMapper = new ObjectMapper();
ExportModelDto exportModelDto = null;
try {
exportModelDto = objectMapper.readValue(file.getInputStream(), ExportModelDto.class);
} catch (IOException e) {
return PagingResultDto.failed(ApiErrorCode.DATA_CORRUPTION, "json数据格式不正确");
}
}浏览器导入excel文件【Workbook】
java
@Operation(summary = "批量新增-导入excel")
@PostMapping("/batchAdd")
public ApiResultDto<?> batchAdd(MultipartFile file) {
SecurityUser user = SecurityUtils.getCurrentUser();
return locationService.batchAdd(file, user);
}
// 具体实现
@Transactional(rollbackFor = Exception.class)
public ApiResultDto<?> batchAdd(MultipartFile file, SecurityUser user) {
UUID projectId = SecurityUtils.getCurrentUser().getProjectId();
// 1. EXCEL文件校验
Workbook workbook;
try {
String originalFilename = file.getOriginalFilename();
if (StringUtils.isBlank(originalFilename)) {
return ApiResultDto.failed(ApiErrorCode.VALID_FAILED, "文件名称有误");
}
String suffix = originalFilename.substring(originalFilename.lastIndexOf("."));
if (StringUtils.equals(ModelConstants.EXCEL_POSTFIX, suffix)) {
workbook = new XSSFWorkbook(file.getInputStream());
} else if (StringUtils.equals(ModelConstants.EXCEL_POSTFIX_XLS, suffix)) {
workbook = new HSSFWorkbook(file.getInputStream());
} else {
return ApiResultDto.failed(ApiErrorCode.BAD_REQUEST, "文件格式错误，支持xls和xlsx格式文件");
}
} catch (Exception e) {
log.error("errMsg", e);
return ApiResultDto.failed(ApiErrorCode.BUSINESS_FAILURE, "文件读取失败");
}
// 2. 获取EXCEL文件内容
Sheet sheet = workbook.getSheetAt(workbook.getActiveSheetIndex());
List<LocationDto> dtos = new ArrayList<>();
for (int i = 1; i <= sheet.getLastRowNum(); i++) {
Row row = sheet.getRow(i);
final String type = ExcelUtils.getStringCellValue(workbook, row.getCell(0));
String bName = ExcelUtils.getStringCellValue(workbook, row.getCell(1));
String bSerialNum = ExcelUtils.getStringCellValue(workbook, row.getCell(2));
String fName = ExcelUtils.getStringCellValue(workbook, row.getCell(3));
String fSerialNum = ExcelUtils.getStringCellValue(workbook, row.getCell(4));
LocationDto dto = new LocationDto();
dto.setRemark(remark);
dto.setSort(StringUtils.isNotBlank(sort) ? Integer.valueOf(sort) : null);
dto.setArea(Objects.nonNull(area) ? Double.valueOf(area) : null);
dtos.add(dto);
}
// 3. 具体业务
return ApiResultDto.success();
}ResourceLoader读取类路径下单个json
java
@Slf4j
@Component
public class ProjectDataBaseInitTask implements ApplicationRunner {
/**
* 资源加载器.
*/
@Autowired
private ResourceLoader resourceLoader;
@Override
public void run(ApplicationArguments args) {
// 1. 读取json文件
InitDbDataDto initDbData = getInitDbDataFromPath("classpath:init/init_property.json");
if (Objects.isNull(initDbData)) {
return;
}
}
/**
* 读取json文件.
*
* @param path 文件路径.
* @return 初始化数据类.
*/
private InitDbDataDto getInitDbDataFromPath(String path) {
if (StringUtils.isEmpty(path)) {
return null;
}
Resource resource = resourceLoader.getResource(path);
if (!resource.exists()) {
log.error("初始化数据不存在");
return null;
}
InitDbDataDto initDbData = null;
try {
InputStream inputStream = resource.getInputStream();
// 判断当前可读取的字节数
if (inputStream.available() == 0) {
continue;
}
ObjectMapper objectMapper = new ObjectMapper();
initDbData = objectMapper.readValue(inputStream, InitDbDataDto.class);
} catch (IOException e) {
log.error("读取json文件错误");
throw new RuntimeException(e);
}
return initDbData;
}
}ResourceLoader读取类路径下所有json文件
java
/**
* 读取classpath:init文件夹下所有json文件.
*
* @param path 文件路径.
* @return 初始化数据类.
*/
private List<InitDbDataDto> getInitDataFromPath(String path) {
List<InitDbDataDto> initDbDataDtos = new ArrayList<>();
// 1. 读取类路径指定文件夹下所有文件
PathMatchingResourcePatternResolver resourceLoader = new PathMatchingResourcePatternResolver();
Resource[] resources;
try {
resources = resourceLoader.getResources(path);
} catch (IOException e) {
throw new RuntimeException(e);
}
if (Objects.isNull(resources)) {
return initDbDataDtos;
}
// 2. 解析数据ObjectMapper
for (Resource resource : resources) {
InitDbDataDto initDbData = null;
try {
InputStream inputStream = resource.getInputStream();
// 判断当前可读取的字节数
if (inputStream.available() == 0) {
continue;
}
ObjectMapper objectMapper = new ObjectMapper();
initDbData = objectMapper.readValue(inputStream, InitDbDataDto.class);
initDbDataDtos.add(initDbData);
} catch (IOException e) {
log.error("读取json文件错误");
throw new RuntimeException(e);
}
}
return initDbDataDtos;
}
List<InitDbDataDto> initDbDatas = getInitDataFromPath("classpath:init/*");