Java 读取Excel格式xls、xlsx数据工具类
需要POI的jar包支持
调用方式
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ReadExcelTest excelTest = new ReadExcelTest(); excelTest.readExcel( "D:\\data1.xlsx" ); |
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package com.util; import java.io.File; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.IOException; import java.io.InputStream; import org.apache.poi.hssf.usermodel.HSSFWorkbook; import org.apache.poi.ss.usermodel.Cell; 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; import org.apache.xmlbeans.impl.piccolo.io.FileFormatException; public class ReadExcelTest { private static final String EXTENSION_XLS = "xls" ; private static final String EXTENSION_XLSX = "xlsx" ; /*** * <pre> * 取得Workbook对象(xls和xlsx对象不同,不过都是Workbook的实现类) * xls:HSSFWorkbook * xlsx:XSSFWorkbook * @param filePath * @return * @throws IOException * </pre> */ private Workbook getWorkbook(String filePath) throws IOException { Workbook workbook = null ; InputStream is = new FileInputStream(filePath); if (filePath.endsWith(EXTENSION_XLS)) { workbook = new HSSFWorkbook(is); } else if (filePath.endsWith(EXTENSION_XLSX)) { workbook = new XSSFWorkbook(is); } return workbook; } /** * 文件检查 * @param filePath * @throws FileNotFoundException * @throws FileFormatException */ private void preReadCheck(String filePath) throws FileNotFoundException, FileFormatException { // 常规检查 File file = new File(filePath); if (!file.exists()) { throw new FileNotFoundException( "传入的文件不存在:" + filePath); } if (!(filePath.endsWith(EXTENSION_XLS) || filePath.endsWith(EXTENSION_XLSX))) { throw new FileFormatException( "传入的文件不是excel" ); } } /** * 读取excel文件内容 * @param filePath * @throws FileNotFoundException * @throws FileFormatException */ public void readExcel(String filePath) throws FileNotFoundException, FileFormatException { // 检查 this .preReadCheck(filePath); // 获取workbook对象 Workbook workbook = null ; try { workbook = this .getWorkbook(filePath); // 读文件 一个sheet一个sheet地读取 for ( int numSheet = 0 ; numSheet < workbook.getNumberOfSheets(); numSheet++) { Sheet sheet = workbook.getSheetAt(numSheet); if (sheet == null ) { continue ; } System.out.println( "=======================" + sheet.getSheetName() + "=========================" ); int firstRowIndex = sheet.getFirstRowNum(); int lastRowIndex = sheet.getLastRowNum(); // 读取首行 即,表头 Row firstRow = sheet.getRow(firstRowIndex); for ( int i = firstRow.getFirstCellNum(); i <= firstRow.getLastCellNum(); i++) { Cell cell = firstRow.getCell(i); String cellValue = this .getCellValue(cell, true ); System.out.print( " " + cellValue + "\t" ); } System.out.println( "" ); // 读取数据行 for ( int rowIndex = firstRowIndex + 1 ; rowIndex <= lastRowIndex; rowIndex++) { Row currentRow = sheet.getRow(rowIndex); // 当前行 int firstColumnIndex = currentRow.getFirstCellNum(); // 首列 int lastColumnIndex = currentRow.getLastCellNum(); // 最后一列 for ( int columnIndex = firstColumnIndex; columnIndex <= lastColumnIndex; columnIndex++) { Cell currentCell = currentRow.getCell(columnIndex); // 当前单元格 String currentCellValue = this .getCellValue(currentCell, true ); // 当前单元格的值 System.out.print(currentCellValue + "\t" ); } System.out.println( "" ); } System.out.println( "======================================================" ); } } catch (Exception e) { e.printStackTrace(); } finally { if (workbook != null ) { try { workbook.close(); } catch (IOException e) { e.printStackTrace(); } } } } /** * 取单元格的值 * @param cell 单元格对象 * @param treatAsStr 为true时,当做文本来取值 (取到的是文本,不会把“1”取成“1.0”) * @return */ private String getCellValue(Cell cell, boolean treatAsStr) { if (cell == null ) { return "" ; } if (treatAsStr) { // 虽然excel中设置的都是文本,但是数字文本还被读错,如“1”取成“1.0” // 加上下面这句,临时把它当做文本来读取 cell.setCellType(Cell.CELL_TYPE_STRING); } if (cell.getCellType() == Cell.CELL_TYPE_BOOLEAN) { return String.valueOf(cell.getBooleanCellValue()); } else if (cell.getCellType() == Cell.CELL_TYPE_NUMERIC) { return String.valueOf(cell.getNumericCellValue()); } else { return String.valueOf(cell.getStringCellValue()); } } } |
使用poi读取xlsx格式的Excel总结
今天遇到的坑
公司实习生项目,其中有个功能是读取Excel数据,之前做过以为很快就能搞定,万万没想到,本地写的一切都正常,可就在要发布生产了,尼玛测试环境居然出bug了读取xlsx格式的Excel,读不了,本地完全可以,就是测试环境上不行,心里一万只曹尼玛奔过
下面是代码部分:
我使用的是springmvc,首先是controller部分
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@RequestMapping ( "ReadFromExcel" ) @ResponseBody public Response ReadFromExcel( @RequestParam (value = "file" ) MultipartFile file, @RequestAttribute ( "userNo" ) String userNo) { try { //校验文件 checkFile(file); List<ArrayList<String>> list =excelService.readExcel(file); if (CollectionUtils.isEmpty(list)) { return new Response(ERROR_CODE, "导入的文件没有数据" , false ); } } catch (Exception e){ logger.error( "ReadFromExcel异常" ,e); } return new Response(ERROR_CODE, "导入失败" , false ); } private void checkFile(MultipartFile file) throws IOException { //判断文件是否存在 if ( null == file){ logger.error( "文件不存在!" ); throw new FileNotFoundException( "文件不存在!" ); } //获得文件名 String fileName = file.getOriginalFilename(); logger.info( "ReadFromExcel fileName" ,fileName); //判断文件是否是excel文件 if (!fileName.endsWith(xls) && !fileName.endsWith(xlsx)){ logger.error(fileName + "不是excel文件" ); throw new IOException(fileName + "不是excel文件" ); } } |
然后是读取Excel文件部分,也就是service部分
这些网上随便一搜都能搜到
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@Override public List<ArrayList<String>> readExcel(MultipartFile file) { List<ArrayList<String>> list = new ArrayList<ArrayList<String>>(); try { // 检查文件 logger.info( "ExcelServiceImpl 获取文件名" , file.getOriginalFilename()); // 获得Workbook工作薄对象 Workbook workbook = getWorkBook(file); // 创建返回对象,把每行中的值作为一个数组,所有行作为一个集合返回 logger.info( "获得Workbook工作薄对象" , file.getOriginalFilename()); if (workbook != null ) { for ( int sheetNum = 0 ; sheetNum < workbook.getNumberOfSheets(); sheetNum++) { // 获得当前sheet工作表 Sheet sheet = workbook.getSheetAt(sheetNum); logger.info( "获得当前sheet工作表" , file.getOriginalFilename()); if (sheet == null ) { continue ; } // 获得当前sheet的开始行 int firstRowNum = sheet.getFirstRowNum(); // 获得当前sheet的结束行 int lastRowNum = sheet.getLastRowNum(); // 循环除了第一行的所有行 for ( int rowNum = firstRowNum + 1 ; rowNum <= lastRowNum; rowNum++) { // 获得当前行 Row row = sheet.getRow(rowNum); if (row == null ) { continue ; } // 获得当前行的开始列 int firstCellNum = row.getFirstCellNum(); // 获得当前行的列数 int lastCellNum = row.getPhysicalNumberOfCells(); ArrayList<String> cells = new ArrayList<>(); // 循环当前行 for ( int cellNum = firstCellNum; cellNum < lastCellNum; cellNum++) { Cell cell = row.getCell(cellNum); cells.add(getCellValue(cell)); } list.add(cells); } } } } catch (Exception e) { logger.error( "readExcel Exception" , e.getMessage()); } return list; } private Workbook getWorkBook(MultipartFile file) { // 获得文件名 String fileName = file.getOriginalFilename(); // 创建Workbook工作薄对象,表示整个excel Workbook workbook = null ; try { // 获取excel文件的io流 InputStream is = file.getInputStream(); logger.info( "获取excel文件的io流" ); // 根据文件后缀名不同(xls和xlsx)获得不同的Workbook实现类对象 if (fileName.endsWith(xls)) { // 2003 workbook = new HSSFWorkbook(is); } else if (fileName.endsWith(xlsx)) { // 2007 workbook = new XSSFWorkbook(is); } } catch (Exception e) { logger.info(e.getMessage()); } return workbook; } private String getCellValue(Cell cell) { String cellValue = "" ; if (cell == null ) { return cellValue; } // 把数字当成String来读,避免出现1读成1.0的情况 if (cell.getCellType() == Cell.CELL_TYPE_NUMERIC) { cell.setCellType(Cell.CELL_TYPE_STRING); } // 判断数据的类型 switch (cell.getCellType()) { case Cell.CELL_TYPE_NUMERIC: // 数字 cellValue = String.valueOf(cell.getNumericCellValue()); break ; case Cell.CELL_TYPE_STRING: // 字符串 cellValue = String.valueOf(cell.getStringCellValue()); break ; case Cell.CELL_TYPE_BOOLEAN: // Boolean cellValue = String.valueOf(cell.getBooleanCellValue()); break ; case Cell.CELL_TYPE_FORMULA: // 公式 cellValue = String.valueOf(cell.getCellFormula()); break ; case Cell.CELL_TYPE_BLANK: // 空值 cellValue = "" ; break ; case Cell.CELL_TYPE_ERROR: // 故障 cellValue = "非法字符" ; break ; default : cellValue = "未知类型" ; break ; } return cellValue; } |
spring-servlet.xml 配置如下
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< bean id = "multipartResolver" class = "org.springframework.web.multipart.commons.CommonsMultipartResolver" > < property name = "defaultEncoding" value = "utf-8" /> < property name = "maxUploadSize" value = "10485760000" /> < property name = "maxInMemorySize" value = "40960" /> </ bean > |
最初的maven是这么配置的
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< dependency > < groupId >org.apache.poi</ groupId > < artifactId >poi-ooxml</ artifactId > < version >3.9</ version > </ dependency > < dependency > < groupId >org.apache.poi</ groupId > < artifactId >poi</ artifactId > < version >3.9</ version > </ dependency > |
好了,本地走起来完全没毛病,很开心,终于可以发布了,可以早点回学校写论文了,发到测试环境,测试读取xls也是没毛病,可尼玛,想读取个xlsx的文件试试看,网页提示404,这什么鬼,打日志查问题,还一直以为是前端的哥们出问题,可一看日志不对啊,请求已经进来了,可是走到这一步就没了 workbook = new XSSFWorkbook(is);这是为什么,赶紧网上查,一堆解决方案,一个个试,最后实在没办法把别人所有的方法一个个试,最后又加了如下jar包
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< dependency > < groupId >xmlbeans</ groupId > < artifactId >xmlbeans</ artifactId > < version >2.3.0</ version > < type >pom</ type > </ dependency > < dependency > < groupId >org.apache.poi</ groupId > < artifactId >poi-ooxml-schemas</ artifactId > < version >3.9</ version > </ dependency > < dependency > < groupId >org.apache.poi</ groupId > < artifactId >poi-scratchpad</ artifactId > < version >3.9</ version > </ dependency > < dependency > < groupId >org.apache.poi</ groupId > < artifactId >poi-examples</ artifactId > < version >3.9</ version > </ dependency > |
问题是解决了,可却不知其所以然,记录一下。以上为个人经验,希望能给大家一个参考,也希望大家多多支持服务器之家。
原文链接:https://blog.csdn.net/wangjianyu0115/article/details/51344853