java的poi技术读取和导入Excel

最新推荐文章于 2022-03-11 17:56:43 发布
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本文详细介绍了如何使用Apache POI库读取Excel 2003文件，并将数据导出到新的Excel文件中。通过定义XlsDto实体类，实现了数据的读取和格式化，最后通过XlsDto2Excel类将数据插入到新的Excel文件中。
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XlsMain .java 类

//该类有main方法，主要负责运行程序，同时该类中也包含了用poi读取Excel(2003版)


import java.io.FileInputStream;

import java.io.IOException;

import java.io.InputStream;

import java.util.ArrayList;

import java.util.List;

 

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 XlsMain
 {

 

    public static void main(String[]
 args) throws IOException
 {

        XlsMain
 xlsMain = new XlsMain();

        XlsDto
 xls = null;

        List<XlsDto>
 list = xlsMain.readXls();

         

        try {

            XlsDto2Excel.xlsDto2Excel(list);

        }
catch (Exception
 e) {

            e.printStackTrace();

        }

        for (int i
 = 0;
 i < list.size(); i++) {

            xls
 = (XlsDto) list.get(i);

            System.out.println(xls.getXh()
 + "   
 " +
 xls.getXm() + "   
 "

                    +
 xls.getYxsmc() + "   
 " +
 xls.getKcm() + "   
 "

                    +
 xls.getCj());

        }

 

    }

 

    /**

     *
 读取xls文件内容

     *

     *
 @return List<XlsDto>对象

     *
 @throws IOException

     *            
 输入/输出(i/o)异常

     */

    private List<XlsDto>
 readXls() throws IOException
 {

        InputStream
 is = new FileInputStream("pldrxkxxmb.xls");

        HSSFWorkbook
 hssfWorkbook = new HSSFWorkbook(is);

        XlsDto
 xlsDto = null;

        List<XlsDto>
 list = new ArrayList<XlsDto>();

        //
 循环工作表Sheet

        for (int numSheet
 = 0;
 numSheet < hssfWorkbook.getNumberOfSheets(); numSheet++) {

            HSSFSheet
 hssfSheet = hssfWorkbook.getSheetAt(numSheet);

            if (hssfSheet
 == null)
 {

                continue;

            }

            //
 循环行Row

            for (int rowNum
 = 1;
 rowNum <= hssfSheet.getLastRowNum(); rowNum++) {

                HSSFRow
 hssfRow = hssfSheet.getRow(rowNum);

                if (hssfRow
 == null)
 {

                    continue;

                }

                xlsDto
 = new XlsDto();

                //
 循环列Cell

                //
 0学号 1姓名 2学院 3课程名 4 成绩

                //
 for (int cellNum = 0; cellNum <=4; cellNum++) {

                HSSFCell
 xh = hssfRow.getCell(0);

                if (xh
 == null)
 {

                    continue;

                }

                xlsDto.setXh(getValue(xh));

                HSSFCell
 xm = hssfRow.getCell(1);

                if (xm
 == null)
 {

                    continue;

                }

                xlsDto.setXm(getValue(xm));

                HSSFCell
 yxsmc = hssfRow.getCell(2);

                if (yxsmc
 == null)
 {

                    continue;

                }

                xlsDto.setYxsmc(getValue(yxsmc));

                HSSFCell
 kcm = hssfRow.getCell(3);

                if (kcm
 == null)
 {

                    continue;

                }

                xlsDto.setKcm(getValue(kcm));

                HSSFCell
 cj = hssfRow.getCell(4);

                if (cj
 == null)
 {

                    continue;

                }

                xlsDto.setCj(Float.parseFloat(getValue(cj)));

                list.add(xlsDto);

            }

        }

        return list;

    }

 

    /**

     *
 得到Excel表中的值

     *

     *
 @param hssfCell

     *           
 Excel中的每一个格子

     *
 @return Excel中每一个格子中的值

     */

    @SuppressWarnings("static-access")

    private String
 getValue(HSSFCell hssfCell) {

        if (hssfCell.getCellType()
 == hssfCell.CELL_TYPE_BOOLEAN) {

            //
 返回布尔类型的值

            return String.valueOf(hssfCell.getBooleanCellValue());

        }
else if (hssfCell.getCellType()
 == hssfCell.CELL_TYPE_NUMERIC) {

            //
 返回数值类型的值

            return String.valueOf(hssfCell.getNumericCellValue());

        }
else {

            //
 返回字符串类型的值

            return String.valueOf(hssfCell.getStringCellValue());

        }

    }

 

}

XlsDto2Excel.java类

//该类主要负责向Excel(2003版)中插入数据

import java.io.FileOutputStream;

import java.io.OutputStream;

import java.util.List;

 

import org.apache.poi.hssf.usermodel.HSSFCell;

import org.apache.poi.hssf.usermodel.HSSFRichTextString;

import org.apache.poi.hssf.usermodel.HSSFRow;

import org.apache.poi.hssf.usermodel.HSSFSheet;

import org.apache.poi.hssf.usermodel.HSSFWorkbook;

 

 

public class XlsDto2Excel
 {

 

    /**

     *

     *
 @param xls

     *           
 XlsDto实体类的一个对象

     *
 @throws Exception

     *            
 在导入Excel的过程中抛出异常

     */

    public static void xlsDto2Excel(List<XlsDto>
 xls) throws Exception
 {

        //
 获取总列数

        int CountColumnNum
 = xls.size();

        //
 创建Excel文档

        HSSFWorkbook
 hwb = new HSSFWorkbook();

        XlsDto
 xlsDto = null;

        //
 sheet 对应一个工作页

        HSSFSheet
 sheet = hwb.createSheet("pldrxkxxmb");

        HSSFRow
 firstrow = sheet.createRow(0);
//
 下标为0的行开始

        HSSFCell[]
 firstcell = new HSSFCell[CountColumnNum];

        String[]
 names = new String[CountColumnNum];

        names[0]
 = "学号";

        names[1]
 = "姓名";

        names[2]
 = "学院";

        names[3]
 = "课程名";

        names[4]
 = "成绩";

        for (int j
 = 0;
 j < CountColumnNum; j++) {

            firstcell[j]
 = firstrow.createCell(j);

            firstcell[j].setCellValue(new HSSFRichTextString(names[j]));

        }

        for (int i
 = 0;
 i < xls.size(); i++) {

            //
 创建一行

            HSSFRow
 row = sheet.createRow(i + 1);

            //
 得到要插入的每一条记录

            xlsDto
 = xls.get(i);

            for (int colu
 = 0;
 colu <= 4;
 colu++) {

                //
 在一行内循环

                HSSFCell
 xh = row.createCell(0);

                xh.setCellValue(xlsDto.getXh());

                HSSFCell
 xm = row.createCell(1);

                xm.setCellValue(xlsDto.getXm());

                HSSFCell
 yxsmc = row.createCell(2);

                yxsmc.setCellValue(xlsDto.getYxsmc());

                HSSFCell
 kcm = row.createCell(3);

                kcm.setCellValue(xlsDto.getKcm());

                HSSFCell
 cj = row.createCell(4);

                cj.setCellValue(xlsDto.getCj());

(xlsDto.getMessage());

            }

        }

        //
 创建文件输出流，准备输出电子表格

        OutputStream
 out = new FileOutputStream("POI2Excel/pldrxkxxmb.xls");

        hwb.write(out);

        out.close();

        System.out.println("数据库导出成功");

    }

 

}

XlsDto .java类

//该类是一个实体类

public class XlsDto
 {

    /**

     *
 选课号

     */

    private Integer
 xkh;

    /**

     *
 学号

     */

    private String
 xh;

    /**

     *
 姓名

     */

    private String
 xm;

    /**

     *
 学院

     */

    private String
 yxsmc;

    /**

     *
 课程号

     */

    private Integer
 kch;

    /**

     *
 课程名

     */

    private String
 kcm;

    /**

     *
 成绩

     */

    private float cj;

    public Integer
 getXkh() {

        return xkh;

    }

    public void setXkh(Integer
 xkh) {

        this.xkh
 = xkh;

    }

    public String
 getXh() {

        return xh;

    }

    public void setXh(String
 xh) {

        this.xh
 = xh;

    }

    public String
 getXm() {

        return xm;

    }

    public void setXm(String
 xm) {

        this.xm
 = xm;

    }

    public String
 getYxsmc() {

        return yxsmc;

    }

    public void setYxsmc(String
 yxsmc) {

        this.yxsmc
 = yxsmc;

    }

    public Integer
 getKch() {

        return kch;

    }

    public void setKch(Integer
 kch) {

        this.kch
 = kch;

    }

    public String
 getKcm() {

        return kcm;

    }

    public void setKcm(String
 kcm) {

        this.kcm
 = kcm;

    }

    public float getCj()
 {

        return cj;

    }

    public void setCj(float cj)
 {

        this.cj
 = cj;

    }

     

}