项目结构：

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

用到的Excel文件：

http://www.cnblogs.com/hongten/gallery/p_w_picpath/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

*

*                 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

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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

*/

public static void xlsDto2Excel(List 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

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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