教你如何使用JAVA POI
作者：张鹏辉
今天教大家怎么学习JAVA POI的用法,文中有非常详细的代码示例,对正在学习java的小伙伴们有很好地帮助,需要的朋友可以参考下
一、导入jar包
所需jar包，在pom中添加如下坐标即可
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi</artifactId>
<version>3.17</version>
</dependency>
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi-ooxml</artifactId>
<version>3.17</version>
</dependency>
注意：
操作Excel文件区分版本：
2003版本（包含2003）以前的扩展名为.xls需要用HSSFWorkbook类操作
2007版本（包含2007）以后的扩展名为.xlsx需要用XSSFWorkbook类操作
二、导出
2007版本（包含2007）以后的扩展名为.xlsx需要用XSSFWorkbook类操作
2003版本（包含2003）以前的扩展名为.xls需要用HSSFWorkbook类操作
和 07基本相似 就是把XSSFWorkbook换成HSSFWorkbook
后缀名改成 点xls
package com.zph.poi;
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;
import org.apache.poi.xssf.usermodel.XSSFCell;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.springframework.core.io.ClassPathResource;
import org.springframework.core.io.Resource;
import org.springframework.stereotype.Service;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.net.URI;
import java.net.URLEncoder;
@Service
public class PoiServiceImpl {
public void exportExcel2007() throws IOException {
//创建工作簿 类似于创建Excel文件
XSSFWorkbook workbook=new XSSFWorkbook();
//创建 sheetname页名
XSSFSheet sheet = workbook.createSheet("员工信息");
sheet.setColumnWidth(3,20*256);//给第3列设置为20个字的宽度
sheet.setColumnWidth(4,20*256);//给第4列设置为20个字的宽度
//创建一行,下标从0开始
XSSFRow row = sheet.createRow(0);
//创建这行中的列,下标从0开始 （表头）
XSSFCell cell = row.createCell(0);
// 给cell 0下表赋值
cell.setCellValue("姓名");
//创建这行中的列,并给该列直接赋值
row.createCell(1).setCellValue("年龄");
row.createCell(2).setCellValue("性别");
row.createCell(3).setCellValue("生日");
row.createCell(4).setCellValue("手机号");
// 设置表里内容
row = sheet.createRow(1);
row.createCell(0).setCellValue("T");
row.createCell(1).setCellValue("保密");
row.createCell(2).setCellValue("男");
row.createCell(3).setCellValue("保密");
row.createCell(4).setCellValue("12121212121");
row = sheet.createRow(2);
row.createCell(0).setCellValue("T");
row.createCell(1).setCellValue("18");
row.createCell(2).setCellValue("女");
row.createCell(3).setCellValue("2000-01-01");
row.createCell(4).setCellValue("12121212122");
//设定 路径
File file = new File("D:\\zph\\temp\\员工信息2007.xlsx");
FileOutputStream stream = new FileOutputStream(file);
// 需要抛异常
workbook.write(stream);
//关流
stream.close();
}
public void exportExcel2003() throws IOException {
//创建工作簿 类似于创建Excel文件
HSSFWorkbook workbook=new HSSFWorkbook();
//创建 sheetname页名
HSSFSheet sheet = workbook.createSheet("员工信息");
//创建一行,下标从0开始
HSSFRow row = sheet.createRow(0);
//创建这行中的列,下标从0开始 （表头）
HSSFCell cell = row.createCell(0);
// 给cell 0下表赋值
cell.setCellValue("姓名");
//创建这行中的列,并给该列直接赋值
row.createCell(1).setCellValue("年龄");
row.createCell(2).setCellValue("性别");
row.createCell(3).setCellValue("生日");
row.createCell(4).setCellValue("手机号");
// 设置表里内容
row = sheet.createRow(1);
row.createCell(0).setCellValue("T");
row.createCell(1).setCellValue("保密");
row.createCell(2).setCellValue("男");
row.createCell(3).setCellValue("保密");
row.createCell(4).setCellValue("12121212121");
row = sheet.createRow(2);
row.createCell(0).setCellValue("T");
row.createCell(1).setCellValue("18");
row.createCell(2).setCellValue("女");
row.createCell(3).setCellValue("2000-01-01");
row.createCell(4).setCellValue("12121212122");
//第一种导出 给定路径
//1设定 路径 创建文件读进来在写内容
File file = new File("D:\\zph\\temp\\员工信息2003.xls");
FileOutputStream stream = new FileOutputStream(file);
// 需要抛异常
workbook.write(stream);
//关流
stream.close();
}
public void exportExcel2003(HttpServletRequest request, HttpServletResponse response) throws IOException {
//第二种导出 从项目中获取模板
//String realPath = request.getSession().getServletContext().getRealPath("/");
Resource resource = new ClassPathResource("templates/员工信息2003Tem.xls");//jar包获取
//创建工作簿 类似于创建Excel文件
HSSFWorkbook workbookTem=new HSSFWorkbook(resource.getInputStream());
//创建 sheetname页名
HSSFSheet sheetTem = workbookTem.getSheet("员工信息");
//HSSFSheet sheetTem = workbookTem.getSheetAt(0);
HSSFRow rowTem = sheetTem.createRow(1);
rowTem.createCell(0).setCellValue("xmtem");
rowTem.createCell(1).setCellValue("nltem");
rowTem.createCell(2).setCellValue("xbtem");
rowTem.createCell(3).setCellValue("srtem");
rowTem.createCell(4).setCellValue("sjhtem");
ServletOutputStream outputStream = response.getOutputStream();
response.reset();
String fileName = URLEncoder.encode("员工信息TemOut.xls", "utf-8");
response.setHeader("Content-disposition","attachment;filename="+fileName);
response.setContentType("application/x-download;charset=UTF-8");
// 对响应客户请求进行重新编码11
//response.setCharacterEncoding("utf-8");
workbookTem.write(outputStream);
outputStream.close();
}
public String exportExcel2003(String s,HttpServletRequest request, HttpServletResponse response) throws IOException {
//第三种直接导出
//创建工作簿 类似于创建Excel文件
HSSFWorkbook workbookTem=new HSSFWorkbook();
//创建 sheetname页名
HSSFSheet sheet = workbookTem.createSheet("员工信息");
//创建一行,下标从0开始
HSSFRow row = sheet.createRow(0);
//创建这行中的列,下标从0开始 （表头）
HSSFCell cell = row.createCell(0);
// 给cell 0下表赋值
cell.setCellValue("姓名");
//创建这行中的列,并给该列直接赋值
row.createCell(1).setCellValue("年龄");
row.createCell(2).setCellValue("性别");
row.createCell(3).setCellValue("生日");
row.createCell(4).setCellValue("手机号");
// 设置表里内容
row = sheet.createRow(1);
row.createCell(0).setCellValue("T");
row.createCell(1).setCellValue("保密");
row.createCell(2).setCellValue("男");
row.createCell(3).setCellValue("保密");
row.createCell(4).setCellValue("12121212121");
row = sheet.createRow(2);
row.createCell(0).setCellValue("T");
row.createCell(1).setCellValue("18");
row.createCell(2).setCellValue("女");
row.createCell(3).setCellValue("2000-01-01");
row.createCell(4).setCellValue("12121212122");
ServletOutputStream outputStream = response.getOutputStream();
response.reset();
String fileName = URLEncoder.encode("员工信息TemOut.xls", "utf-8");
response.setHeader("Content-disposition","attachment;filename="+fileName);
//response.setContentType("application/x-download;charset=UTF-8");
response.setContentType("application/vnd.ms-excel");
//response.setContentType("application/msexcel");
// 对响应客户请求进行重新编码11
//response.setCharacterEncoding("utf-8");
workbookTem.write(outputStream);
outputStream.close();
return s;
}
}
三、导出
@RequestMapping(value="/upload")
public String uploadExcel(@RequestParam("fileData") MultipartFile file, HttpServletRequest request, HttpServletResponse response) throws Exception {
InputStream in = file.getInputStream();
String s = poiService.uploadExcel(file, request, response);
return s;
}
public String uploadExcel(MultipartFile file, HttpServletRequest request, HttpServletResponse response) throws Exception {
InputStream in = file.getInputStream();
//D:\zph\temp
// 多态 抛异常
//Workbook sheets = new XSSFWorkbook(stream);
HSSFWorkbook sheets = new HSSFWorkbook(in);
//获取一个工作表(sheet页)，下标从0开始
HSSFSheet sheet = sheets.getSheetAt(0);
for (int i = 1; i<=sheet.getLastRowNum() ; i++) {
// 获取行数
Row row = sheet.getRow(i);
// 获取单元格 取值
String value1 = row.getCell(0).getStringCellValue();
String value2 = row.getCell(1).getStringCellValue();
String value3 = row.getCell(2).getStringCellValue();
String value4 = row.getCell(3).getStringCellValue();
String value5= row.getCell(4).getStringCellValue();
System.out.println(value1);
System.out.println(value2);
System.out.println(value3);
System.out.println(value4);
System.out.println(value5);
}
//关流
sheets.close();
in.close();
return "hha";
}
postman 设置 post请求 请求头 Content-Type multipart/form-data
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