java poi 读取Excel-蒲公英云

转载： http://www.cnblogs.com/hongten/archive/2012/02/22/java2poi.html
感谢作者，感激不尽

项目结构

表格格式

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
*
* 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;
}

}

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