本教程只实现poi简单的上传下载功能，如需高级操作请绕行!
<!--poi start--> <dependency> <groupId>org.apache.poi</groupId> <artifactId>poi</artifactId> <version>3.15</version> </dependency> <dependency> <groupId>org.apache.poi</groupId> <artifactId>poi-ooxml-schemas</artifactId> <version>3.15</version> </dependency> <dependency> <groupId>org.apache.poi</groupId> <artifactId>poi-ooxml</artifactId> <version>3.15</version> </dependency> <!--poi end-->
resources目录下准备一个提供下载的文件：题目批量上传Excel.xls
poi工具类：
package com.rm.framework.util;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;
import org.apache.log4j.Logger;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.springframework.web.multipart.MultipartFile;
/**
* excel读写工具类
*/
public class POIUtil {
private static Logger logger = Logger.getLogger(POIUtil.class);
private final static String xls = "xls";
private final static String xlsx = "xlsx";
/**
* 读入excel文件，解析后返回
* @param file
* @throws IOException
*/
public static List<String[]> readExcel(MultipartFile file) throws IOException{
//检查文件
checkFile(file);
//获得Workbook工作薄对象
Workbook workbook = getWorkBook(file);
//创建返回对象，把每行中的值作为一个数组，所有行作为一个集合返回
List<String[]> list = new ArrayList<String[]>();
if(workbook != null){
for(int sheetNum = 0;sheetNum < workbook.getNumberOfSheets();sheetNum++){
//获得当前sheet工作表
Sheet sheet = workbook.getSheetAt(sheetNum);
if(sheet == null){
continue;
}
//获得当前sheet的开始行
int firstRowNum = sheet.getFirstRowNum();
//获得当前sheet的结束行
int lastRowNum = sheet.getLastRowNum();
//循环除了第一行的所有行
for(int rowNum = firstRowNum+1;rowNum <= lastRowNum;rowNum++){
//获得当前行
Row row = sheet.getRow(rowNum);
if(row == null){
continue;
}
//获得当前行的开始列
int firstCellNum = row.getFirstCellNum();
//获得当前行的列数
int lastCellNum = row.getPhysicalNumberOfCells();
String[] cells = new String[row.getPhysicalNumberOfCells()];
//循环当前行
StringBuffer sb = new StringBuffer();
for(int cellNum = firstCellNum; cellNum < lastCellNum;cellNum++){
Cell cell = row.getCell(cellNum);
cells[cellNum] = getCellValue(cell);
sb.append(cells[cellNum]);
}
int length = sb.toString().length();
if(length>5){
list.add(cells);
}else{
sb.delete(0, sb.length());
}
}
}
// workbook.close();
}
return list;
}
public static void checkFile(MultipartFile file) throws IOException{
//判断文件是否存在
if(null == file){
logger.error("文件不存在！");
throw new FileNotFoundException("文件不存在！");
}
//获得文件名
String fileName = file.getOriginalFilename();
//判断文件是否是excel文件
if(!fileName.endsWith(xls) && !fileName.endsWith(xlsx)){
logger.error(fileName + "不是excel文件");
throw new IOException(fileName + "不是excel文件");
}
}
public static Workbook getWorkBook(MultipartFile file) {
//获得文件名
String fileName = file.getOriginalFilename();
//创建Workbook工作薄对象，表示整个excel
Workbook workbook = null;
try {
//获取excel文件的io流
InputStream is = file.getInputStream();
//根据文件后缀名不同(xls和xlsx)获得不同的Workbook实现类对象
if(fileName.endsWith(xls)){
//2003
workbook = new HSSFWorkbook(is);
}else if(fileName.endsWith(xlsx)){
//2007 及2007以上
workbook = new XSSFWorkbook(is);
}
} catch (IOException e) {
logger.info(e.getMessage());
}
return workbook;
}
public static String getCellValue(Cell cell){
String cellValue = "";
if(cell == null){
return cellValue;
}
//把数字当成String来读，避免出现1读成1.0的情况
if(cell.getCellType() == Cell.CELL_TYPE_NUMERIC){
cell.setCellType(Cell.CELL_TYPE_STRING);
}
//判断数据的类型
switch (cell.getCellType()){
case Cell.CELL_TYPE_NUMERIC: //数字
cellValue = String.valueOf(cell.getNumericCellValue());
break;
case Cell.CELL_TYPE_STRING: //字符串
cellValue = String.valueOf(cell.getStringCellValue());
break;
case Cell.CELL_TYPE_BOOLEAN: //Boolean
cellValue = String.valueOf(cell.getBooleanCellValue());
break;
case Cell.CELL_TYPE_FORMULA: //公式
cellValue = String.valueOf(cell.getCellFormula());
break;
case Cell.CELL_TYPE_BLANK: //空值
cellValue = "";
break;
case Cell.CELL_TYPE_ERROR: //故障
cellValue = "非法字符";
break;
default:
cellValue = "未知类型";
break;
}
return cellValue;
}
}
controller：
package com.rm.eval.controller;
import java.util.Date;
import com.rm.eval.entity.EvalQuestion;
import com.rm.eval.service.EvalQnQuestionService;
import com.rm.framework.controller.BaseController;
import com.rm.framework.util.CUID;
import com.rm.framework.util.POIUtil;
import com.rm.sys.dao.SysUserDao;
import com.rm.sys.entity.SysUser;
import org.apache.poi.hssf.usermodel.*;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.multipart.MultipartFile;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.*;
import java.net.URLEncoder;
import java.util.List;
@RestController
@RequestMapping(value = "/excel")
public class ExcelController extends BaseController {
@Autowired
private SysUserDao sysUserDao;
//创建表头
private void createTitle(HSSFWorkbook workbook, HSSFSheet sheet){
HSSFRow row = sheet.createRow(0);
//设置列宽，setColumnWidth的第二个参数要乘以256，这个参数的单位是1/256个字符宽度
sheet.setColumnWidth(1,12*256);
sheet.setColumnWidth(3,17*256);
//设置为居中加粗
HSSFCellStyle style = workbook.createCellStyle();
HSSFFont font = workbook.createFont();
font.setBold(true);
style.setAlignment(HSSFCellStyle.ALIGN_CENTER);
style.setFont(font);
HSSFCell cell;
cell = row.createCell(0);
cell.setCellValue("题目内容");
cell.setCellStyle(style);
//题目内容，类型，难度，维度，状态，备注
cell = row.createCell(1);
cell.setCellValue("类型");
cell.setCellStyle(style);
cell = row.createCell(2);
cell.setCellValue("难度");
cell.setCellStyle(style);
cell = row.createCell(3);
cell.setCellValue("维度");
cell.setCellStyle(style);
cell = row.createCell(4);
cell.setCellValue("状态");
cell.setCellStyle(style);
cell = row.createCell(5);
cell.setCellValue("备注");
cell.setCellStyle(style);
}
//生成user表excel
@GetMapping(value = "/getUser")
public String getUser(HttpServletResponse response) throws Exception{
HSSFWorkbook workbook = new HSSFWorkbook();
HSSFSheet sheet = workbook.createSheet("题目批量上传");
createTitle(workbook,sheet);
// List<SysUser> rows = sysUserService.getAll();
List<SysUser> rows = sysUserDao.findAll();
//设置日期格式
HSSFCellStyle style = workbook.createCellStyle();
style.setDataFormat(HSSFDataFormat.getBuiltinFormat("m/d/yy h:mm"));
//新增数据行，并且设置单元格数据
String fileName = "题目批量上传Excel.xls";
//生成excel文件
buildExcelFile(fileName, workbook);
//浏览器下载excel
buildExcelDocument(fileName,workbook,response);
return "download excel";
}
//生成excel文件
protected void buildExcelFile(String filename,HSSFWorkbook workbook) throws Exception{
FileOutputStream fos = new FileOutputStream(filename);
workbook.write(fos);
fos.flush();
fos.close();
}
//浏览器下载excel
protected void buildExcelDocument(String filename,HSSFWorkbook workbook,HttpServletResponse response) throws Exception{
response.setContentType("application/vnd.ms-excel");
response.setHeader("Content-Disposition", "attachment;filename="+ URLEncoder.encode(filename, "utf-8"));
OutputStream outputStream = response.getOutputStream();
workbook.write(outputStream);
outputStream.flush();
outputStream.close();
}
/**
* 文件下载
*/
@ResponseBody
@GetMapping(value = "/download")
public ResponseEntity<byte[]> download(HttpSession session) {
System.out.println("das");
ResponseEntity<byte[]> response = null;
try {
byte[] body = null;
InputStream in=ExcelController.class.getClassLoader().getResourceAsStream("题目批量上传Excel.xls");
body = new byte[in.available()];
in.read(body);
HttpHeaders headers = new HttpHeaders();
String fileName11 = new String("题目批量上传Excel".getBytes("GB2312"), "ISO_8859_1");
headers.add("Content-Disposition", "attachment;filename=" + fileName11 + ".xls");
HttpStatus statusCode = HttpStatus.OK;
response = new ResponseEntity<byte[]>(body, headers, statusCode);
return response;
} catch (IOException e) {
e.printStackTrace();
}
return response;
}
@Autowired
private com.rm.eval.service.EvalQuestionService evalQuestionService;
/**
* 文件上传
* @param file
* @return
*/
@ResponseBody
@RequestMapping(value = "/UploadFile")
public String UploadFile(@RequestParam(required=false) MultipartFile file ){
String flag ="0";
try{
List<String[]> list = POIUtil.readExcel(file); //这里得到的是一个集合，里面的每一个元素是String[]数组
//TODO service实现方法
System.out.println(list);
for (int i=0;i<list.size();i++){
EvalQuestion eval = new EvalQuestion();
eval.setTitle(list.get(i)[0]);//题目
String type= list.get(i)[1];
eval.setType(GetAndSetType(type));//类型
String diffcult= list.get(i)[2];
eval.setDiffcult(GetAndSetDiffcult(diffcult));//难度
eval.setWay(list.get(i)[3]);
eval.setStatus("1");
eval.setSort(0);
eval.setRemark(list.get(i)[4]);
eval.setValidateFlag("Y");
eval.setCreateManId(getCurrentUser().getId());
eval.setCreateMan(getCurrentUser().getName());
eval.setCreateDate(new Date());
eval.setModify_date(new Date());
eval.setCom(getUserCom());
eval.setId(CUID.createUUID("EvalQuestion"));
evalQuestionService.save(eval);
}
} catch(Exception e){
flag = "1";
}
return flag;
}
private String GetAndSetDiffcult(String type) {
switch (type){
case "简单":
type="A";
break;
case "容易":
type="B";
break;
case "困难":
type="C";
break;
case "艰难":
type="D";
break;
}
return type;
}
private String GetAndSetType(String type){
switch (type){
case "单选题":
type="A";
break;
case "多选题":
type="B";
break;
case "排序题":
type="C";
break;
case "程度题":
type="D";
break;
case "问答题":
type="E";
break;
case "矩阵程度题":
type="F";
break;
case "拽选择题":
type="G";
break;
}
return type;
}
}