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转:POI读取Excel浅谈

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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:
Java代码
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:
Java代码
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。
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