一、前提條件
POI組件基礎知識，POI操作Excel文檔、讀取、寫入、合併單元格。（點擊查看）
SSM框架整合Maven工程整合Spring+Springmvc+Mybatis(詳細教程，附代碼)（點擊查看）
二、POI與SSM框架整合實現Excel導入
1、Maven工程pom.xml文件中添加Excel導入所需依賴包
<!-- POI -->
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi</artifactId>
<version>3.16</version>
</dependency>
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi-ooxml-schemas</artifactId>
<version>3.16</version>
</dependency>
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi-excelant</artifactId>
<version>3.16</version>
</dependency>
<!-- 文件上傳類 -->
<dependency>
<groupId>commons-fileupload</groupId>
<artifactId>commons-fileupload</artifactId>
<version>1.3.1</version>
</dependency>
<dependency>
<groupId>commons-io</groupId>
<artifactId>commons-io</artifactId>
<version>2.1</version>
</dependency>
2、修改spring-mvc.xml增加文件上傳配置
<!-- 文件上傳 -->
<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
<property name="defaultEncoding" value="utf-8"></property>
<property name="maxUploadSize" value="10485760000"></property>
<property name="maxInMemorySize" value="40960"></property>
</bean>
3、編寫Excel上傳處理控制類Controller層
@Controller
public class FileUploadController {
@Autowired
NewStudentInfoService newStudentInfoService;
@RequestMapping(value="/importexcel",method=RequestMethod.POST)
public String uploadExcel(@RequestParam("file") MultipartFile file,HttpServletRequest request,Model model){
//獲取服務器端路徑
String path=request.getServletContext().getRealPath("upload");
//獲取到上傳文件名稱
String fileName=file.getOriginalFilename();
//創建目標File
File targetFile=new File(path+"\\"+fileName);
//創建存儲目錄
File targetPath=new File(path);
//判斷服務器端目錄是否存在,如果不存在創建目錄
if(!targetPath.exists()){
targetPath.mkdir();
}
//把上傳的文件存儲到服務器端
try {
file.transferTo(targetFile);
} catch (IllegalStateException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
//讀取上傳到服務器端的文件,遍歷excel
try {
Workbook workbook=WorkbookFactory.create(targetFile);
Sheet sheet = workbook.getSheet("Sheet1");
//判斷行數
int rownum = sheet.getPhysicalNumberOfRows();
for(int i=0;i<rownum;i++){
Row row = sheet.getRow(i);
//判斷單元格數量
int cellnum = row.getPhysicalNumberOfCells();
StringBuffer buf=new StringBuffer();
for(int j=0;j<cellnum;j++){
Cell cell = row.getCell(j);
if(cell.getCellType()==HSSFCell.CELL_TYPE_STRING){
buf.append(cell.getStringCellValue()+"~");
}else if(cell.getCellType()==HSSFCell.CELL_TYPE_NUMERIC){
//創建數字格式化工具類
DecimalFormat df=new DecimalFormat("####");
//把從cell單元格讀取到的數字,進行格式化防止科學計數法形式顯示
buf.append(df.format(cell.getNumericCellValue())+"~");
}
}
//單元格循環完成後讀取到的是一行內容 1~xingming~88
String hang=buf.toString();
String[] rows=hang.split("~");
NewStudent stu=new NewStudent();
stu.setName(rows[1]);
stu.setScore(Integer.valueOf(rows[2]));
stu.setPhone(rows[3]);
System.out.println("上傳學生信息:"+stu);
newStudentInfoService.saveStudent(stu);
}
} catch (InvalidFormatException | IOException e) {
e.printStackTrace();
}
return "sucess";
}
4、Service層
public interface NewStudentInfoService {
public int save(NewStudent newStudent);
public List<NewStudent> getAllStu();
}
@Service
public class NewStudentInfoServiceImpl implements NewStudentInfoService {
@Autowired
NewStudentInfoDao newStudentInfoDao;
@Override
public int save(NewStudent newStudent) {
return newStudentInfoDao.save(newStudent);
}
@Override
public List<NewStudent> getAllStu() {
List<NewStudent> allStudents = newStudentInfoDao.getAllStudents();
return allStudents;
}
}
5、Dao層——以一個簡單的小例子爲案例
public interface NewStudentInfoDao {
public int save(NewStudent newStudent);
public List<NewStudent> getAllStudents();
}
6、mapper*.xml
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.zxh.Dao.NewStudentInfoDao">
<insert id="save" parameterType="com.zxh.pojo.NewStudent">
INSERT INTO person (NAME,age,phone) VALUE(#{name},#{age},#{phone})
</insert>
<select id="getAllStudents" resultType="com.zxh.pojo.NewStudent">
SELECT * FROM person
</select>
</mapper>
7、編寫JSP頁面excelupload.jsp
<%@ page language="java" contentType="text/html; charset=utf-8"
pageEncoding="utf-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>Insert title here</title>
</head>
<body>
<a href="downloadexcel">導出Excel</a>
</br></br></br></br>
<form action="importexcel" method="post" enctype="multipart/form-data">
<input type="file" name="file">
<input type="submit" value="上傳">
</form>
</body>
</html>
8、編寫JSP頁面sucess.jsp 存放在：WEB-INF/jsp目錄下
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
<div style="text-align:center">
上傳文件成功!</div>
</body>
</html>
9、數據庫
/*!40101 SET NAMES utf8 */;
create table `person` (
`id` int (9),
`name` varchar (36),
`age` varchar (27),
`phone` varchar (48)
);
10、測試運行——導入Excel文件
數據庫中得到上傳的信息
三、POI與SSM框架整合實現Excel導出
1、編寫Excel導出Controller
@Controller
public class OutPutExcel {
@Autowired
NewStudentInfoService newStudentInfoService;
@RequestMapping(value = "/downloadexcel")
public ResponseEntity<byte[]> down(HttpServletRequest request, HttpServletResponse response, Model model)
throws IOException {
System.out.println("111111111");
// 從數據庫讀取數據
List<NewStudent> allStu = newStudentInfoService.getAllStu();
// 獲取服務路徑
String path = request.getServletContext().getRealPath("down");
String filename = "demo.xlsx";
// 存儲File
File tfile = new File(path + "\\" + filename);
// 目錄
File mfile = new File(path);
if (!tfile.exists()) {
mfile.mkdir();
}
// 生成excel
XSSFWorkbook workbook = new XSSFWorkbook();
XSSFSheet sheet = workbook.createSheet("學員信息表");
int rownum = 0;
for (NewStudent stu : allStu) {
XSSFRow row = sheet.createRow(rownum);
row.createCell(0).setCellValue(stu.getName());
row.createCell(1).setCellValue(stu.getName());
row.createCell(2).setCellValue(stu.getAge());
row.createCell(3).setCellValue(stu.getphone());
rownum++;
}
// 保存workbook
try {
workbook.write(new FileOutputStream(tfile));
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
// 創建請求頭對象
HttpHeaders headers = new HttpHeaders();
// 下載顯示的文件名，解決中文名稱亂碼問題
String downloadFileName = new String(filename.getBytes("UTF-8"), "iso-8859-1");
// 通知瀏覽器以attachment(下載方式)打開
headers.setContentDispositionFormData("attachment", downloadFileName);
// application/octet-stream:二進制流數據（最常見的文件下載）
headers.setContentType(MediaType.APPLICATION_OCTET_STREAM);
ResponseEntity<byte[]> responseEntity = new ResponseEntity<byte[]>(FileUtils.readFileToByteArray(tfile),
headers, HttpStatus.CREATED);
return responseEntity;
}
}
2、Excel導出設置
