java的poi技术读取和导入Excel

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;

    }

     

}