POI读取Excel方式两种遍历方式

转载自:http://hi.baidu.com/251020458/item/d0237f884969a612c3162707
 
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;
  
 
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());
}

 

另外的一种迭代的方法,不过这种方式直接没有空行:

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;
 
 
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。

 

转载自:http://hi.baidu.com/251020458/item/d0237f884969a612c3162707

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