POI读取Excel 各种特殊数字和类型的转换 取值带一个E

 发布日期:2019-01-19 08:27:58  阅读次数:阅读数:12  来源:
               

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();                 }         } }
得到Excel的文件然后读取,这个很简单。关键有两个地方,也许在网上会看到有的这样使用有的那样使用。 
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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