开发一个超市app需要多少钱宁宁网seo

可以在 pom.xml 中添加以下依赖：

<dependency><groupId>org.apache.poi</groupId><artifactId>poi</artifactId><version>5.2.3</version>
</dependency>
<dependency><groupId>org.apache.poi</groupId><artifactId>poi-ooxml</artifactId><version>5.2.3</version>
</dependency>
<dependency><groupId>org.apache.poi</groupId><artifactId>poi-ooxml-schemas</artifactId><version>4.1.2</version>
</dependency>
<dependency><groupId>org.apache.xmlbeans</groupId><artifactId>xmlbeans</artifactId><version>5.1.1</version>
</dependency>

import org.apache.poi.ss.usermodel.*;import java.io.*;
import java.nio.file.Files;
import java.nio.file.StandardCopyOption;
import java.util.Arrays;
import java.util.Collections;
import java.util.zip.ZipEntry;
import java.util.zip.ZipInputStream;public class ZipExcelMerger {public static void main(String[] args) {// 原始zip文件路径String zipDirectory = "path/to/zip/files";// 解压zip文件至新的路径String outputDirectory = "path/to/output";File dir = new File(zipDirectory);File[] zipFiles = dir.listFiles((d, name) -> name.endsWith(".zip"));if (zipFiles != null) {// 升序Collections.sort(Arrays.asList(zipDirectory));for (File zipFile : zipFiles) {unzipAndMerge(zipFile, outputDirectory);}}}private static void unzipAndMerge(File zipFile, String outputDirectory) {try (ZipInputStream zis = new ZipInputStream(new FileInputStream(zipFile))) {ZipEntry entry;while ((entry = zis.getNextEntry()) != null) {if (!entry.isDirectory() && (entry.getName().endsWith(".xls") || entry.getName().endsWith(".xlsx"))) {File outputFile = new File(outputDirectory, entry.getName());byte[] buffer = new byte[1024];ByteArrayOutputStream baos = new ByteArrayOutputStream();int len;while ((len = zis.read(buffer)) > 0) {baos.write(buffer, 0, len);}baos.close();if (outputFile.exists()) {mergeExcelFiles(outputFile, new ByteArrayInputStream(baos.toByteArray()));} else {saveToFile(outputFile, new ByteArrayInputStream(baos.toByteArray()));}}}} catch (IOException e) {e.printStackTrace();}}private static void mergeExcelFiles(File existingFile, InputStream newFileStream) {File tempFile = null;try {// 创建临时文件tempFile = File.createTempFile("temp", ".xlsx");Files.copy(existingFile.toPath(), tempFile.toPath(), StandardCopyOption.REPLACE_EXISTING);// 读取临时文件Workbook existingWorkbook;try (InputStream is = new FileInputStream(tempFile)) {existingWorkbook = WorkbookFactory.create(is);}// 读取新文件try (Workbook newWorkbook = createWorkbook(newFileStream, existingFile.getName())) {for (int i = 0; i < newWorkbook.getNumberOfSheets(); i++) {Sheet newSheet = newWorkbook.getSheetAt(i);Sheet existingSheet = existingWorkbook.getSheet(newSheet.getSheetName());if (existingSheet != null) {for (int j = 1; j <= newSheet.getLastRowNum(); j++) {Row newRow = newSheet.getRow(j);if (newRow != null) {Row existingRow = existingSheet.createRow(existingSheet.getLastRowNum() + 1);copyRow(newRow, existingRow);}}}}}// 将合并后的内容写回临时文件try (OutputStream os = new FileOutputStream(tempFile)) {existingWorkbook.write(os);}// 用临时文件替换原文件Files.move(tempFile.toPath(), existingFile.toPath(), StandardCopyOption.REPLACE_EXISTING);} catch (IOException e) {e.printStackTrace();} finally {// 删除临时文件if (tempFile != null && tempFile.exists()) {tempFile.delete();}}}private static Workbook createWorkbook(InputStream inputStream, String fileName) throws IOException {if (fileName.endsWith(".xlsx")) {return WorkbookFactory.create(inputStream);} else if (fileName.endsWith(".xls")) {return WorkbookFactory.create(inputStream);} else {throw new IllegalArgumentException("Unsupported file format: " + fileName);}}private static void saveToFile(File file, InputStream inputStream) {try (FileOutputStream fos = new FileOutputStream(file)) {byte[] buffer = new byte[1024];int len;while ((len = inputStream.read(buffer)) > 0) {fos.write(buffer, 0, len);}} catch (IOException e) {e.printStackTrace();}}private static void copyRow(Row sourceRow, Row targetRow) {for (int i = 0; i < sourceRow.getLastCellNum(); i++) {Cell sourceCell = sourceRow.getCell(i);if (sourceCell != null) {Cell targetCell = targetRow.createCell(i);targetCell.setCellValue(sourceCell.toString());}}}
}