java中使用poi导出读取导入Excel

项目结构：

http://www.cnblogs.com/hongten/gallery/image/111987.html

 用到的Excel文件：

http://www.cnblogs.com/hongten/gallery/image/111988.html

 

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)

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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;

 

 

/**

 *

 * @author Hongten</br>

 *

 *         参考地址：http://hao0610.iteye.com/blog/1160678

 *

 */

public class XlsMain {

 

    publicstatic 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

     */

    privateList<XlsDto> readXls() throwsIOException {

        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);

            }

        }

        returnlist;

    }

 

    /**

     * 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")

    privateString getValue(HSSFCell hssfCell) {

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

            // 返回布尔类型的值

            returnString.valueOf(hssfCell.getBooleanCellValue());

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

            // 返回数值类型的值

            returnString.valueOf(hssfCell.getNumericCellValue());

        }else {

            // 返回字符串类型的值

            returnString.valueOf(hssfCell.getStringCellValue());

        }

    }

 

}

 

 

 

XlsDto2Excel.java类

//该类主要负责向Excel(2003版)中插入数据

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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

     */

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

        // 获取总列数

        intCountColumnNum = 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(newHSSFRichTextString(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

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public class XlsDto {

    /**

     * 选课号

     */

    privateInteger xkh;

    /**

     * 学号

     */

    privateString xh;

    /**

     * 姓名

     */

    privateString xm;

    /**

     * 学院

     */

    privateString yxsmc;

    /**

     * 课程号

     */

    privateInteger kch;

    /**

     * 课程名

     */

    privateString kcm;

    /**

     * 成绩

     */

    privatefloat cj;

    publicInteger getXkh() {

        returnxkh;

    }

    publicvoid setXkh(Integer xkh) {

        this.xkh = xkh;

    }

    publicString getXh() {

        returnxh;

    }

    publicvoid setXh(String xh) {

        this.xh = xh;

    }

    publicString getXm() {

        returnxm;

    }

    publicvoid setXm(String xm) {

        this.xm = xm;

    }

    publicString getYxsmc() {

        returnyxsmc;

    }

    publicvoid setYxsmc(String yxsmc) {

        this.yxsmc = yxsmc;

    }

    publicInteger getKch() {

        returnkch;

    }

    publicvoid setKch(Integer kch) {

        this.kch = kch;

    }

    publicString getKcm() {

        returnkcm;

    }

    publicvoid setKcm(String kcm) {

        this.kcm = kcm;

    }

    publicfloat getCj() {

        returncj;

    }

    publicvoid setCj(floatcj) {

        this.cj = cj;

    }

     

}

 

后台输出：

数据库导出成功
1.0    hongten    信息技术学院    计算机网络应用基础    80.0
2.0    王五    信息技术学院    计算机网络应用基础    81.0
3.0    李胜基    信息技术学院    计算机网络应用基础    82.0
4.0    五班古    信息技术学院    计算机网络应用基础    83.0
5.0    蔡诗芸    信息技术学院    计算机网络应用基础    84.0