Excel電子表格的讀取--------Poi的簡單小工具
阿新 • • 發佈：2018-11-24
首先 加入依賴
<!-- https://mvnrepository.com/artifact/org.apache.poi/poi-ooxml -->
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi-ooxml</artifactId>
<version>3.17</version>
</dependency>暫時的一個讀取工具類，電子表格 轉換成 List<List<Object>>
package com.sola.utils; import java.io.File; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.IOException; import java.text.DecimalFormat; import java.text.SimpleDateFormat; import java.util.LinkedList; import java.util.List; import org.apache.poi.hssf.usermodel.HSSFCell; import org.apache.poi.hssf.usermodel.HSSFDateUtil; import org.apache.poi.hssf.usermodel.HSSFRow; import org.apache.poi.hssf.usermodel.HSSFSheet; import org.apache.poi.hssf.usermodel.HSSFWorkbook; import org.apache.poi.xssf.usermodel.XSSFCell; import org.apache.poi.xssf.usermodel.XSSFRow; import org.apache.poi.xssf.usermodel.XSSFSheet; import org.apache.poi.xssf.usermodel.XSSFWorkbook; public class ExcelUtil { /** * 對外提供讀取excel 的方法 * */ public static List<List<Object>> readExcel(File file) throws IOException { String fileName = file.getName(); String extension = fileName.lastIndexOf(".") == -1 ? "" : fileName .substring(fileName.lastIndexOf(".") + 1); if ("xls".equals(extension)) { return read2003Excel(file); } else if ("xlsx".equals(extension)) { return read2007Excel(file); } else { throw new IOException("不支援的檔案型別"); } } /** * 讀取 office 2003 excel * * @throws IOException * @throws FileNotFoundException */ private static List<List<Object>> read2003Excel(File file) throws IOException { List<List<Object>> list = new LinkedList<List<Object>>(); HSSFWorkbook hwb = new HSSFWorkbook(new FileInputStream(file)); HSSFSheet sheet = hwb.getSheetAt(0); Object value = null; HSSFRow row = null; HSSFCell cell = null; int counter = 0; for (int i = sheet.getFirstRowNum(); counter < sheet .getPhysicalNumberOfRows(); i++) { row = sheet.getRow(i); if (row == null) { continue; } else { counter++; } List<Object> linked = new LinkedList<Object>(); for (int j = row.getFirstCellNum(); j <= row.getLastCellNum(); j++) { cell = row.getCell(j); if (cell == null) { continue; } DecimalFormat df = new DecimalFormat("0");// 格式化 number String // 字元 SimpleDateFormat sdf = new SimpleDateFormat( "yyyy-MM-dd HH:mm:ss");// 格式化日期字串 DecimalFormat nf = new DecimalFormat("0");// 格式化數字 switch (cell.getCellType()) { case XSSFCell.CELL_TYPE_STRING: System.out.println(i + "行" + j + " 列 is String type"); value = cell.getStringCellValue(); break; case XSSFCell.CELL_TYPE_NUMERIC: System.out.println(i + "行" + j + " 列 is Number type ; DateFormt:" + cell.getCellStyle().getDataFormatString()); if ("@".equals(cell.getCellStyle().getDataFormatString())) { value = df.format(cell.getNumericCellValue()); } else if ("General".equals(cell.getCellStyle() .getDataFormatString())) { value = nf.format(cell.getNumericCellValue()); } else { value = sdf.format(HSSFDateUtil.getJavaDate(cell .getNumericCellValue())); } break; case XSSFCell.CELL_TYPE_BOOLEAN: System.out.println(i + "行" + j + " 列 is Boolean type"); value = cell.getBooleanCellValue(); break; case XSSFCell.CELL_TYPE_BLANK: System.out.println(i + "行" + j + " 列 is Blank type"); value = ""; break; default: System.out.println(i + "行" + j + " 列 is default type"); value = cell.toString(); } if (value == null || "".equals(value)) { continue; } linked.add(value); } list.add(linked); } return list; } /** * 讀取Office 2007 excel * */ private static List<List<Object>> read2007Excel(File file) throws IOException { List<List<Object>> list = new LinkedList<List<Object>>(); // 構造 XSSFWorkbook 物件，strPath 傳入檔案路徑 XSSFWorkbook xwb = new XSSFWorkbook(new FileInputStream(file)); // 讀取第一章表格內容 XSSFSheet sheet = xwb.getSheetAt(0); Object value = null; XSSFRow row = null; XSSFCell cell = null; int counter = 0; for (int i = sheet.getFirstRowNum(); counter < sheet .getPhysicalNumberOfRows(); i++) { row = sheet.getRow(i); if (row == null) { continue; } else { counter++; } List<Object> linked = new LinkedList<Object>(); for (int j = row.getFirstCellNum(); j <= row.getLastCellNum(); j++) { cell = row.getCell(j); if (cell == null) { continue; } DecimalFormat df = new DecimalFormat("0");// 格式化 number String 字元 SimpleDateFormat sdf = new SimpleDateFormat( "yyyy-MM-dd HH:mm:ss");// 格式化日期字串 DecimalFormat nf = new DecimalFormat("0");// 格式化數字 switch (cell.getCellType()) { case XSSFCell.CELL_TYPE_STRING: System.out.println(i + "行" + j + " 列 is String type"); value = cell.getStringCellValue(); break; case XSSFCell.CELL_TYPE_NUMERIC: System.out.println(i + "行" + j + " 列 is Number type ; DateFormt:" + cell.getCellStyle().getDataFormatString()); if ("@".equals(cell.getCellStyle().getDataFormatString())) { value = df.format(cell.getNumericCellValue()); } else if ("General".equals(cell.getCellStyle() .getDataFormatString())) { value = nf.format(cell.getNumericCellValue()); } else { value = sdf.format(HSSFDateUtil.getJavaDate(cell .getNumericCellValue())); } break; case XSSFCell.CELL_TYPE_BOOLEAN: System.out.println(i + "行" + j + " 列 is Boolean type"); value = cell.getBooleanCellValue(); break; case XSSFCell.CELL_TYPE_BLANK: System.out.println(i + "行" + j + " 列 is Blank type"); value = ""; break; default: System.out.println(i + "行" + j + " 列 is default type"); value = cell.toString(); } if (value == null || "".equals(value)) { continue; } System.out.println(value.toString()); linked.add(value); } list.add(linked); } return list; } public static void main(String[] args) { try { /*readExcel(new File("C:\\Users\\levitian\\Desktop\\重點人群布控\\敏感人群.xlsx"));*/ List<List<Object>> readExcel = readExcel(new File("D:\\poitest.xlsx")); System.out.println("------------"); System.out.println(readExcel); // readExcel(new File("E:\\testRead.xls")); } catch (IOException e) { e.printStackTrace(); } } }
讓控制檯列印輸出結果
