poi导入导出excel

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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;
 
 
/**
 *
 * @author Hongten</br>
 *
 *         参考地址：http://hao0610.iteye.com/blog/1160678
 *
 */
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;
    }
     
}

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