須要用的jar包以下:java
若是是maven管理的項目,添加依賴以下:web
<!-- https://mvnrepository.com/artifact/org.apache.poi/poi --> <dependency> <groupId>org.apache.poi</groupId> <artifactId>poi</artifactId> <version>3.14</version> </dependency> <!-- https://mvnrepository.com/artifact/org.apache.poi/poi-ooxml --> <dependency> <groupId>org.apache.poi</groupId> <artifactId>poi-ooxml</artifactId> <version>3.14</version> </dependency>
POIUtil代碼以下:spring
import java.io.FileNotFoundException; import java.io.IOException; import java.io.InputStream; import java.util.ArrayList; import java.util.List; import org.apache.log4j.Logger; 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.springframework.web.multipart.MultipartFile; /** * excel讀寫工具類 */ public class POIUtil { private static Logger logger = Logger.getLogger(POIUtil.class); private final static String xls = "xls"; private final static String xlsx = "xlsx"; /** * 讀入excel文件,解析後返回 * @param file * @throws IOException */ public static List<String[]> readExcel(MultipartFile file) throws IOException{ //檢查文件 checkFile(file); //得到Workbook工做薄對象 Workbook workbook = getWorkBook(file); //建立返回對象,把每行中的值做爲一個數組,全部行做爲一個集合返回 List<String[]> list = new ArrayList<String[]>(); if(workbook != null){ for(int sheetNum = 0;sheetNum < workbook.getNumberOfSheets();sheetNum++){ //得到當前sheet工做表 Sheet sheet = workbook.getSheetAt(sheetNum); if(sheet == null){ continue; } //得到當前sheet的開始行 int firstRowNum = sheet.getFirstRowNum(); //得到當前sheet的結束行 int lastRowNum = sheet.getLastRowNum(); //循環除了第一行的全部行 for(int rowNum = firstRowNum+1;rowNum <= lastRowNum;rowNum++){ //得到當前行 Row row = sheet.getRow(rowNum); if(row == null){ continue; } //得到當前行的開始列 int firstCellNum = row.getFirstCellNum(); //得到當前行的列數 int lastCellNum = row.getPhysicalNumberOfCells(); String[] cells = new String[row.getPhysicalNumberOfCells()]; //循環當前行 for(int cellNum = firstCellNum; cellNum < lastCellNum;cellNum++){ Cell cell = row.getCell(cellNum); cells[cellNum] = getCellValue(cell); } list.add(cells); } } workbook.close(); } return list; } public static void checkFile(MultipartFile file) throws IOException{ //判斷文件是否存在 if(null == file){ logger.error("文件不存在!"); throw new FileNotFoundException("文件不存在!"); } //得到文件名 String fileName = file.getOriginalFilename(); //判斷文件是不是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"); } } public static Workbook getWorkBook(MultipartFile file) { //得到文件名 String fileName = file.getOriginalFilename(); //建立Workbook工做薄對象,表示整個excel Workbook workbook = null; try { //獲取excel文件的io流 InputStream is = file.getInputStream(); //根據文件後綴名不一樣(xls和xlsx)得到不一樣的Workbook實現類對象 if(fileName.endsWith(xls)){ //2003 workbook = new HSSFWorkbook(is); }else if(fileName.endsWith(xlsx)){ //2007 workbook = new XSSFWorkbook(is); } } catch (IOException e) { logger.info(e.getMessage()); } return workbook; } public static String getCellValue(Cell cell){ String cellValue = ""; if(cell == null){ return cellValue; } //把數字當成String來讀,避免出現1讀成1.0的狀況 if(cell.getCellType() == Cell.CELL_TYPE_NUMERIC){ cell.setCellType(Cell.CELL_TYPE_STRING); } //判斷數據的類型 switch (cell.getCellType()){ case Cell.CELL_TYPE_NUMERIC: //數字 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 = "未知類型"; break; } return cellValue; } }
該工具類主要用來處理從客戶端上傳到服務器的Excel文件。若須要處理本地的文件,只要把方法getWorkbook作必定修改便可,readExcel方法的形參的類型也須要修改。 apache