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();
                }
        }
}

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