用poi导入excel的xls和xlsx文件

用java代码编程，用poi导入excel的xls和xlsx文件

xls和xlsx是新旧版本你用哪个

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 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对象
- @throws IOException
- 输入/输出(i/o)异常 */ private List readXls() throws IOException { InputStream is = new FileInputStream("pldrxkxxmb.xls"); HSSFWorkbook hssfWorkbook = new HSSFWorkbook(is); XlsDto xlsDto = null; List list = new ArrayList(); // 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;
}

}