標籤:XML alt str title maven 讀取 ast 檔案 伺服器
需要用的jar包如下:
如果是maven管理的項目,添加依賴如下:
<!-- 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代碼如下:
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檔案,解析後返回 * @param file * @throws IOException */ public static List<String[]> readExcel(MultipartFile file) throws IOException{ //檢查檔案 checkFile(file); //獲得Workbook工作薄對象 Workbook workbook = getWorkBook(file); //建立返回對象,把每行中的值作為一個數組,所有行作為一個集合返回 List<String[]> list = new ArrayList<String[]>(); if(workbook != null){ for(int sheetNum = 0;sheetNum < workbook.getNumberOfSheets();sheetNum++){ //獲得當前sheet工作表 Sheet sheet = workbook.getSheetAt(sheetNum); if(sheet == null){ continue; } //獲得當前sheet的開始行 int firstRowNum = sheet.getFirstRowNum(); //獲得當前sheet的結束行 int lastRowNum = sheet.getLastRowNum(); //迴圈除了第一行的所有行 for(int rowNum = firstRowNum+1;rowNum <= lastRowNum;rowNum++){ //獲得當前行 Row row = sheet.getRow(rowNum); if(row == null){ continue; } //獲得當前行的開始列 int firstCellNum = row.getFirstCellNum(); //獲得當前行的列數 int lastCellNum = row.getPhysicalNumberOfCells(); String[] cells = new String[row.getPhysicalNumberOfCells()]; //迴圈當前行 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{ //判斷檔案是否存在 if(null == file){ logger.error("檔案不存在!"); throw new FileNotFoundException("檔案不存在!"); } //獲得檔案名稱 String fileName = file.getOriginalFilename(); //判斷檔案是否是excel檔案 if(!fileName.endsWith(xls) && !fileName.endsWith(xlsx)){ logger.error(fileName + "不是excel檔案"); throw new IOException(fileName + "不是excel檔案"); } } public static Workbook getWorkBook(MultipartFile file) { //獲得檔案名稱 String fileName = file.getOriginalFilename(); //建立Workbook工作薄對象,表示整個excel Workbook workbook = null; try { //擷取excel檔案的io流 InputStream is = file.getInputStream(); //根據檔案尾碼名不同(xls和xlsx)獲得不同的Workbook實作類別對象 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的情況 if(cell.getCellType() == Cell.CELL_TYPE_NUMERIC){ cell.setCellType(Cell.CELL_TYPE_STRING); } //判斷資料的類型 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 = "非法字元"; break; default: cellValue = "未知類型"; break; } return cellValue; } }
該工具類主要用來處理從用戶端上傳到伺服器的Excel檔案。若需要處理本地的檔案,只要把方法getWorkbook做一定修改即可,readExcel方法的形參的類型也需要修改。
原文:java使用POI實現excel檔案的讀取,相容尾碼名xls和xlsx
java使用POI實現excel檔案的讀取,相容尾碼名xls和xlsx