POI读取Excel 各种特殊数字和类型的转换 取值带一个E
1, 对于类似电话号码或手机一类的大数值读取问题
// 取值后会带一个E的问题 double cellValue = row.getCell(k).getNumericCellValue(); fieldValues[k] = new DecimalFormat("#").format(cellValue); 2, 对于数值型单元的纯数值和日期型的处理
case HSSFCell.CELL_TYPE_NUMERIC: // 数值型 if (HSSFDateUtil.isCellDateFormatted(cell)) { // 如果是date类型则 ，获取该cell的date值 value = HSSFDateUtil.getJavaDate(cell.getNumericCellValue()).toString(); } else { // 纯数字 value = String.valueOf(cell.getNumericCellValue()); }转： POI读取Excel浅谈
先看代码，挨句解释：
一般遍历使用两种方式，1：得到总的行数和每行的列数，然后循环。2：使用迭代
先看第一种：
Java代码 package com.golden.test; import java.io.File; import java.io.FileInputStream; import org.apache.poi.hssf.usermodel.HSSFCell; import org.apache.poi.hssf.usermodel.HSSFRow; import org.apache.poi.hssf.usermodel.HSSFSheet; import org.apache.poi.hssf.usermodel.HSSFWorkbook; /** * * @author 崔素强 * */ public class PoiReadXls2 { public static void main(String[] args) { File f = new File("c:\\a.xls"); try { FileInputStream is = new FileInputStream(f); HSSFWorkbook wbs = new HSSFWorkbook(is); HSSFSheet childSheet = wbs.getSheetAt(0); // System.out.println(childSheet.getPhysicalNumberOfRows()); System.out.println("有行数" + childSheet.getLastRowNum()); for (int j = 0; j < childSheet.getLastRowNum(); j++) { HSSFRow row = childSheet.getRow(j); // System.out.println(row.getPhysicalNumberOfCells()); // System.out.println("有列数" + row.getLastCellNum()); if (null != row) { for (int k = 0; k < row.getLastCellNum(); k++) { HSSFCell cell = row.getCell(k); if (null != cell) { switch (cell.getCellType()) { case HSSFCell.CELL_TYPE_NUMERIC: // 数字 System.out.print(cell.getNumericCellValue() + " "); break; case HSSFCell.CELL_TYPE_STRING: // 字符串 System.out.print(cell.getStringCellValue() + " "); break; case HSSFCell.CELL_TYPE_BOOLEAN: // Boolean System.out.println(cell.getBooleanCellValue() + " "); break; case HSSFCell.CELL_TYPE_FORMULA: // 公式 System.out.print(cell.getCellFormula() + " "); break; case HSSFCell.CELL_TYPE_BLANK: // 空值 System.out.println(" "); break; case HSSFCell.CELL_TYPE_ERROR: // 故障 System.out.println(" "); break; default: System.out.print("未知类型 "); break; } } else { System.out.print("- "); } } } System.out.println(); } } catch (Exception e) { e.printStackTrace(); } } } package com.golden.test; import java.io.File; import java.io.FileInputStream; import org.apache.poi.hssf.usermodel.HSSFCell; import org.apache.poi.hssf.usermodel.HSSFRow; import org.apache.poi.hssf.usermodel.HSSFSheet; import org.apache.poi.hssf.usermodel.HSSFWorkbook; /** * * @author 崔素强 * */ public class PoiReadXls2 { public static void main(String[] args) { File f = new File("c:\\a.xls"); try { FileInputStream is = new FileInputStream(f); HSSFWorkbook wbs = new HSSFWorkbook(is); HSSFSheet childSheet = wbs.getSheetAt(0); // System.out.println(childSheet.getPhysicalNumberOfRows()); System.out.println("有行数" + childSheet.getLastRowNum()); for (int j = 0; j < childSheet.getLastRowNum(); j++) { HSSFRow row = childSheet.getRow(j); // System.out.println(row.getPhysicalNumberOfCells()); // System.out.println("有列数" + row.getLastCellNum()); if (null != row) { for (int k = 0; k < row.getLastCellNum(); k++) { HSSFCell cell = row.getCell(k); if (null != cell) { switch (cell.getCellType()) { case HSSFCell.CELL_TYPE_NUMERIC: // 数字 System.out.print(cell.getNumericCellValue() + " "); break; case HSSFCell.CELL_TYPE_STRING: // 字符串 System.out.print(cell.getStringCellValue() + " "); break; case HSSFCell.CELL_TYPE_BOOLEAN: // Boolean System.out.println(cell.getBooleanCellValue() + " "); break; case HSSFCell.CELL_TYPE_FORMULA: // 公式 System.out.print(cell.getCellFormula() + " "); break; case HSSFCell.CELL_TYPE_BLANK: // 空值 System.out.println(" "); break; case HSSFCell.CELL_TYPE_ERROR: // 故障 System.out.println(" "); break; default: System.out.print("未知类型 "); break; } } else { System.out.print("- "); } } } System.out.println(); } } catch (Exception e) { e.printStackTrace(); } } }System.out.println("有行数" + childSheet.getLastRowNum());
System.out.println(childSheet.getPhysicalNumberOfRows());
System.out.println("有列数" + row.getLastCellNum());
System.out.println(row.getPhysicalNumberOfCells());
如果人都拷贝代码进行使用了，不知道有什么区别。太多的区别不知道，但是有一点我发现了，那就是如果中间各行或者隔列的话getPhysicalNumberOfRows和getPhysicalNumberOfCells就不能读取到所有的行和列了。
再者，一定要对单元格的格式进行判断switch (cell.getCellType())，不同的单元格格式使用不同的方法。最后加上为止类型，以防万一。
而且在数字类型里，又分为了纯数字和时间格式：
case HSSFCell.CELL_TYPE_NUMERIC: // 数值型 if (HSSFDateUtil.isCellDateFormatted(cell)) { // 如果是date类型则 ，获取该cell的date值 value = HSSFDateUtil.getJavaDate(cell.getNumericCellValue()).toString(); } else { // 纯数字 value = String.valueOf(cell.getNumericCellValue()); } case HSSFCell.CELL_TYPE_NUMERIC: // 数值型 if (HSSFDateUtil.isCellDateFormatted(cell)) { // 如果是date类型则 ，获取该cell的date值 value = HSSFDateUtil.getJavaDate(cell.getNumericCellValue()).toString(); } else { // 纯数字 value = String.valueOf(cell.getNumericCellValue()); }还有一种迭代的方法：
package com.golden.test; import java.io.File; import java.io.FileInputStream; import java.io.IOException; import java.io.InputStream; import java.util.Iterator; import org.apache.poi.hssf.usermodel.HSSFCell; 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.poifs.filesystem.POIFSFileSystem; /** * * @author 崔素强 * */ public class PoiReadXls { @SuppressWarnings( { "unchecked", "deprecation" }) public static void main(String[] args) { File f = new File("c:\\a.xls"); try { InputStream input = new FileInputStream(f); POIFSFileSystem fs = new POIFSFileSystem(input); HSSFWorkbook wb = new HSSFWorkbook(fs); HSSFSheet sheet = wb.getSheetAt(0); Iterator rows = sheet.rowIterator(); while (rows.hasNext()) { HSSFRow row = (HSSFRow) rows.next(); // System.out.print("行：" + row.getRowNum() + " "); Iterator cells = row.cellIterator(); while (cells.hasNext()) { HSSFCell cell = (HSSFCell) cells.next(); // System.out.println("列：" + cell.getCellNum()); switch (cell.getCellType()) { case HSSFCell.CELL_TYPE_NUMERIC: // 数字 System.out.print(cell.getNumericCellValue() + " "); break; case HSSFCell.CELL_TYPE_STRING: // 字符串 System.out.print(cell.getStringCellValue() + " "); break; case HSSFCell.CELL_TYPE_BOOLEAN: // Boolean System.out.println(cell.getBooleanCellValue() + " "); break; case HSSFCell.CELL_TYPE_FORMULA: // 公式 System.out.print(cell.getCellFormula() + " "); break; case HSSFCell.CELL_TYPE_BLANK: // 空值 System.out.println(" "); break; case HSSFCell.CELL_TYPE_ERROR: // 故障 System.out.println(" "); break; default: System.out.print("未知类型 "); break; } } System.out.println(); } } catch (IOException ex) { ex.printStackTrace(); } } } package com.golden.test; import java.io.File; import java.io.FileInputStream; import java.io.IOException; import java.io.InputStream; import java.util.Iterator; import org.apache.poi.hssf.usermodel.HSSFCell; 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.poifs.filesystem.POIFSFileSystem; /** * * @author 崔素强 * */ public class PoiReadXls { @SuppressWarnings( { "unchecked", "deprecation" }) public static void main(String[] args) { File f = new File("c:\\a.xls"); try { InputStream input = new FileInputStream(f); POIFSFileSystem fs = new POIFSFileSystem(input); HSSFWorkbook wb = new HSSFWorkbook(fs); HSSFSheet sheet = wb.getSheetAt(0); Iterator rows = sheet.rowIterator(); while (rows.hasNext()) { HSSFRow row = (HSSFRow) rows.next(); // System.out.print("行：" + row.getRowNum() + " "); Iterator cells = row.cellIterator(); while (cells.hasNext()) { HSSFCell cell = (HSSFCell) cells.next(); // System.out.println("列：" + cell.getCellNum()); switch (cell.getCellType()) { case HSSFCell.CELL_TYPE_NUMERIC: // 数字 System.out.print(cell.getNumericCellValue() + " "); break; case HSSFCell.CELL_TYPE_STRING: // 字符串 System.out.print(cell.getStringCellValue() + " "); break; case HSSFCell.CELL_TYPE_BOOLEAN: // Boolean System.out.println(cell.getBooleanCellValue() + " "); break; case HSSFCell.CELL_TYPE_FORMULA: // 公式 System.out.print(cell.getCellFormula() + " "); break; case HSSFCell.CELL_TYPE_BLANK: // 空值 System.out.println(" "); break; case HSSFCell.CELL_TYPE_ERROR: // 故障 System.out.println(" "); break; default: System.out.print("未知类型 "); break; } } System.out.println(); } } catch (IOException ex) { ex.printStackTrace(); } } }这种方法，如果数据的紧凑的，使用还是方便的，但是我发现，如果是空行或者是空列，他就会隔过去。具体的自己试试就知道了。
另外，也能看到这里得到Excel文件的方式是通过File，如果要引用到Struts2里，这是很简单的，因为Struts2上传时Action里定义的就是File或者File数组。
原文章地址：http://jammy-zhou.iteye.com/blog/850240
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