java如何导出excel表格,如果用poi,java代码如何实现.，求代码！！！

Posted 2023-03-09

参考技术A 项目结构：

xls:

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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;




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本回答被提问者和网友采纳