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依賴jar

<dependency><groupId>org.apache.poi</groupId><artifactId>poi-ooxml</artifactId><version>4.0.1</version></dependency>

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ExcelUtils.java

package javax.utils;import java.io.File; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.IOException; import java.io.InputStream; import java.io.OutputStream; import java.math.BigDecimal; import java.text.DateFormat; import java.text.SimpleDateFormat; import java.util.ArrayList; import java.util.Date; import java.util.List;import org.apache.poi.hssf.usermodel.HSSFWorkbook; import org.apache.poi.ss.usermodel.Cell; import org.apache.poi.ss.usermodel.DateUtil; import org.apache.poi.ss.usermodel.Row; import org.apache.poi.ss.usermodel.Sheet; import org.apache.poi.ss.usermodel.Workbook; import org.apache.poi.xssf.usermodel.XSSFWorkbook;/*** Excel 工具類(兼容xls和xlsx)* * @author Logan* @version 1.0.0* @createDate 2019-03-07**/ public class ExcelUtils {private static final String XLS = "xls";private static final String XLSX = "xlsx";private static final DateFormat FORMAT = new SimpleDateFormat("yyyy/MM/dd HH:mm:ss");/*** 輸出數據到自定義模版的Excel輸出流* * @param excelTemplate 自定義模版文件* @param data 數據* @param outputStream Excel輸出流* @throws IOException 錯誤時拋出異常，由調用者處理*/public static void writeDataToTemplateOutputStream(File excelTemplate, List<List<Object>> data, OutputStream outputStream) throws IOException {Workbook book = ExcelUtils.getWorkbookFromExcel(excelTemplate);ExcelUtils.writeDataToWorkbook(null, data, book, 0);ExcelUtils.writeWorkbookToOutputStream(book, outputStream);}/*** 從Excel文件獲取Workbook對象* * @param excelFile Excel文件* @return Workbook對象* @throws IOException 錯誤時拋出異常，由調用者處理*/public static Workbook getWorkbookFromExcel(File excelFile) throws IOException {try (InputStream inputStream = new FileInputStream(excelFile);) {if (excelFile.getName().endsWith(XLS)) {return new HSSFWorkbook(inputStream);}else if (excelFile.getName().endsWith(XLSX)) {return new XSSFWorkbook(inputStream);}else {throw new IOException("文件類型錯誤");}}}/*** 把Workbook對象內容輸出到Excel文件* * @param book Workbook對象* @param file Excel文件* @throws FileNotFoundException 找不到文件異常，文件已創建，實際不存在該異常* @throws IOException 輸入輸出異常*/public static void writeWorkbookToFile(Workbook book, File file) throws FileNotFoundException, IOException {if (!file.exists()) {if (!file.getParentFile().exists()) {file.getParentFile().mkdirs();}file.createNewFile();}try (OutputStream outputStream = new FileOutputStream(file);) {writeWorkbookToOutputStream(book, outputStream);}}/*** 把Workbook對象輸出到Excel輸出流* * @param book Workbook對象* @param outputStream Excel輸出流* @throws IOException 錯誤時拋出異常，由調用者處理*/public static void writeWorkbookToOutputStream(Workbook book, OutputStream outputStream) throws IOException {book.write(outputStream);}/*** 輸出數據到Workbook對象中指定頁碼* * @param title 標題，寫在第一行，可傳null* @param data 數據* @param book Workbook對象* @param page 輸出數據到Workbook指定頁碼的頁面數*/public static void writeDataToWorkbook(List<String> title, List<List<Object>> data, Workbook book, int page) {Sheet sheet = book.getSheetAt(page);Row row = null;Cell cell = null;// 設置表頭if (null != title && !title.isEmpty()) {row = sheet.getRow(0);if (null == row) {row = sheet.createRow(0);}for (int i = 0; i < title.size(); i++) {cell = row.getCell(i);if (null == cell) {cell = row.createCell(i);}cell.setCellValue(title.get(i));}}List<Object> rowData = null;for (int i = 0; i < data.size(); i++) {row = sheet.getRow(i + 1);if (null == row) {row = sheet.createRow(i + 1);}rowData = data.get(i);if (null == rowData) {continue;}for (int j = 0; j < rowData.size(); j++) {cell = row.getCell(j);if (null == cell) {cell = row.createCell(j);}setValue(cell, rowData.get(j));}}}/*** 讀取Excel文件第一頁* * @param pathname 文件路徑名* @return 第一頁數據集合* @throws IOException 錯誤時拋出異常，由調用者處理*/public static List<List<Object>> readExcelFirstSheet(String pathname) throws IOException {File file = new File(pathname);return readExcelFirstSheet(file);}/*** 讀取Excel文件第一頁* * @param file Excel文件* @return 第一頁數據集合* @throws IOException 錯誤時拋出異常，由調用者處理*/public static List<List<Object>> readExcelFirstSheet(File file) throws IOException {try (InputStream inputStream = new FileInputStream(file);) {if (file.getName().endsWith(XLS)) {return readXlsFirstSheet(inputStream);}else if (file.getName().endsWith(XLSX)) {return readXlsxFirstSheet(inputStream);}else {throw new IOException("文件類型錯誤");}}}/*** 讀取xls格式Excel文件第一頁* * @param inputStream Excel文件輸入流* @return 第一頁數據集合* @throws IOException 錯誤時拋出異常，由調用者處理*/public static List<List<Object>> readXlsFirstSheet(InputStream inputStream) throws IOException {Workbook workbook = new HSSFWorkbook(inputStream);return readExcelFirstSheet(workbook);}/*** 讀取xlsx格式Excel文件第一頁* * @param inputStream Excel文件輸入流* @return 第一頁數據集合* @throws IOException 錯誤時拋出異常，由調用者處理*/public static List<List<Object>> readXlsxFirstSheet(InputStream inputStream) throws IOException {Workbook workbook = new XSSFWorkbook(inputStream);return readExcelFirstSheet(workbook);}/*** 讀取Workbook第一頁* * @param book Workbook對象* @return 第一頁數據集合*/public static List<List<Object>> readExcelFirstSheet(Workbook book) {return readExcel(book, 0);}/*** 讀取指定頁面的Excel* * @param book Workbook對象* @param page 頁碼* @return 指定頁面數據集合*/public static List<List<Object>> readExcel(Workbook book, int page) {List<List<Object>> list = new ArrayList<>();Sheet sheet = book.getSheetAt(page);for (int i = 0; i <= sheet.getLastRowNum(); i++) {Row row = sheet.getRow(i);// 如果當前行為空，則加入空，保持行號一致if (null == row) {list.add(null);continue;}List<Object> columns = new ArrayList<>();for (int j = 0; j < row.getLastCellNum(); j++) {Cell cell = row.getCell(j);columns.add(getValue(cell));}list.add(columns);}return list;}/*** 解析單元格中的值* * @param cell 單元格* @return 單元格內的值*/private static Object getValue(Cell cell) {if (null == cell) {return null;}Object value = null;switch (cell.getCellType()) {case BOOLEAN:value = cell.getBooleanCellValue();break;case NUMERIC:// 日期類型，轉換為日期if (DateUtil.isCellDateFormatted(cell)) {value = cell.getDateCellValue();}// 數值類型else {// 默認返回double，創建BigDecimal返回準確值value = new BigDecimal(cell.getNumericCellValue());}break;default:value = cell.toString();break;}return value;}/*** 設置單元格值* * @param cell 單元格* @param value 值*/private static void setValue(Cell cell, Object value) {if (null == cell) {return;}if (null == value) {cell.setCellValue((String) null);}else if (value instanceof Boolean) {cell.setCellValue((Boolean) value);}else if (value instanceof Date) {cell.setCellValue(FORMAT.format((Date) value));}else if (value instanceof Double) {cell.setCellValue((Double) value);}else {cell.setCellValue(value.toString());}}}

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轉載于:https://www.cnblogs.com/jonban/p/10491714.html

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