java处理excel（poi和easyexcel）

poi和easyexcel性能区别

poi

xls（03） 65536 poi HSSF
xlsx（07）无限制 poi-ooxml XSSF

工作簿：Workbook
工作表：Sheet
行：Row
列：Cell

poi写：03和07

@Testpublic void testWrite03() throws IOException {Workbook workbook = new HSSFWorkbook();Sheet sheet = workbook.createSheet("03表限制65536");for (int i = 0; i < 10; i++) {Row row = sheet.createRow(i);for (int j = 0; j < 10; j++) {Cell cell = row.createCell(j);cell.setCellValue(new DateTime().toString("yyyy-MM-dd HH:mm:ss"));}}FileOutputStream outputStream = new FileOutputStream(PATH + "03表限制65536.xls");workbook.write(outputStream);outputStream.close();}

 @Testpublic void testWrite07() throws IOException {Workbook workbook = new HSSFWorkbook();Sheet sheet = workbook.createSheet("07表无限制");for (int i = 0; i < 10; i++) {Row row = sheet.createRow(i);for (int j = 0; j < 10; j++) {Cell cell = row.createCell(j);cell.setCellValue(i + j);}}FileOutputStream outputStream = new FileOutputStream(PATH + "07表无限制.xlsx");workbook.write(outputStream);outputStream.close();}

 /*** 2.99* @throws IOException*/@Testpublic void testWrite03BigData() throws IOException {long begin = System.currentTimeMillis();Workbook workbook = new HSSFWorkbook();Sheet sheet = workbook.createSheet("03插入大量数据");for (int i = 0; i < 65536; i++) {Row row = sheet.createRow(i);for (int j = 0; j < 10; j++) {Cell cell = row.createCell(j);cell.setCellValue(j);}}FileOutputStream fileOutputStream = new FileOutputStream(PATH + "03插入大量数据.xls");workbook.write(fileOutputStream);fileOutputStream.close();long end = System.currentTimeMillis();System.out.println((double) (end - begin) / 1000);}/*** 10.78（65536）* 15.70(100000)* @throws IOException*/@Testpublic void testWrite07BigData() throws IOException {long begin = System.currentTimeMillis();Workbook workbook = new XSSFWorkbook();Sheet sheet = workbook.createSheet("07插入大量数据");for (int i = 0; i < 100000; i++) {Row row = sheet.createRow(i);for (int j = 0; j < 10; j++) {Cell cell = row.createCell(j);cell.setCellValue(j);}}FileOutputStream fileOutputStream = new FileOutputStream(PATH + "07插入大量数据.xlsx");workbook.write(fileOutputStream);fileOutputStream.close();long end = System.currentTimeMillis();System.out.println((double) (end - begin) / 1000);}/*** 4.26(100000)* 需要清楚零时文件* @throws IOException*/@Testpublic void testWrite07BigDataS() throws IOException {long begin = System.currentTimeMillis();Workbook workbook = new SXSSFWorkbook();Sheet sheet = workbook.createSheet("07插入大量数据S");for (int i = 0; i < 100000; i++) {Row row = sheet.createRow(i);for (int j = 0; j < 10; j++) {Cell cell = row.createCell(j);cell.setCellValue(j);}}FileOutputStream fileOutputStream = new FileOutputStream(PATH + "07插入大量数据S.xlsx");workbook.write(fileOutputStream);fileOutputStream.close();long end = System.currentTimeMillis();//清楚零时文件((SXSSFWorkbook) workbook).dispose();System.out.println((double) (end - begin) / 1000);}

错误：java.lang.noclassdeffounderror:
org/apache/poi/ss/usermodel/date1904support

解决：poi版本选择：一致

<dependency><groupId>org.apache.poi</groupId><artifactId>poi</artifactId><version>3.17</version>
</dependency>
<dependency><groupId>org.apache.poi</groupId><artifactId>poi-ooxml</artifactId><version>3.17</version>
</dependency>

poi读：03和07

 @Testpublic void testRead03() throws IOException {FileInputStream fileInputStream = new FileInputStream(PATH + "03表限制65536.xls");Workbook workbook = new HSSFWorkbook(fileInputStream);Sheet sheet = workbook.getSheetAt(0);Row row = sheet.getRow(0);Cell cell = row.getCell(0);System.out.println(cell.getStringCellValue());fileInputStream.close();}@Testpublic void testRead07() throws IOException {FileInputStream fileInputStream = new FileInputStream(PATH + "07插入大量数据.xlsx");Workbook workbook = new XSSFWorkbook(fileInputStream);Sheet sheet = workbook.getSheetAt(0);Row row = sheet.getRow(0);Cell cell = row.getCell(0);System.out.println(cell.getNumericCellValue());fileInputStream.close();}

poi读取问题：后缀名修改实际上可能没改变文件属性，要实际看看是什么类型的看表格有没有大于65535
大于65535.xslx用XSSF

**注意：**读取单元格要注意不同类型选择

/*** 读取excel工具类* @param fileInputStream 文件输入流* @throws IOException*/public void readExcelUtil(FileInputStream fileInputStream) throws IOException {Workbook workbook = new XSSFWorkbook(fileInputStream);Sheet sheet = workbook.getSheetAt(0);//获取表头内容Row rowTitle = sheet.getRow(0);if (rowTitle != null) {int cellCount = rowTitle.getPhysicalNumberOfCells();for (int cellNum = 0; cellNum < cellCount; cellNum++) {Cell cell = rowTitle.getCell(cellNum);if (cell != null) {//                    int cellType = cell.getCellType();String cellValue = cell.getStringCellValue();System.out.print(cellValue + "|");}}System.out.println();}//获取表格数据int rowCount = sheet.getPhysicalNumberOfRows();for (int rowNum = 1; rowNum < rowCount; rowNum++) {Row rowData = sheet.getRow(rowNum);if (rowData != null) {int cellCount = rowTitle.getPhysicalNumberOfCells();for (int cellNum = 0; cellNum < cellCount; cellNum++) {Cell cell = rowData.getCell(cellNum);String cellValue = "";if (cell != null) {switch (cell.getCellTypeEnum()) {case STRING:System.out.print("STRING ");cellValue = cell.getStringCellValue();break;case BOOLEAN:System.out.print("BOOLEAN ");cellValue = String.valueOf(cell.getBooleanCellValue());break;case BLANK:System.out.print("BLANK ");break;case NUMERIC:if (HSSFDateUtil.isCellDateFormatted(cell)) {System.out.print("日期 ");Date date = cell.getDateCellValue();cellValue = new DateTime(date).toString("yyyy/MM/dd");} else {//防止数字过长，先转化为stringSystem.out.print("数字过长，先转化为string ");cell.setCellType(CellType.STRING);cellValue = cell.toString();}break;case ERROR:System.out.print("ERROR ");break;case FORMULA:System.out.print("FORMULA ");String formula = cell.getCellFormula();System.out.print(formula);FormulaEvaluator formulaEvaluator = new HSSFFormulaEvaluator((HSSFWorkbook) workbook);CellValue evaluate = formulaEvaluator.evaluate(cell);cellValue = evaluate.formatAsString();}System.out.println(cellValue);}}}}fileInputStream.close();}

easyexcel

https://www.yuque.com/easyexcel

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java处理excel（poi和easyexcel）

poi和easyexcel性能区别

poi

poi写：03和07

poi读：03和07

easyexcel

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