本教程只實現poi簡單的上傳下載功能，如需高級操做請繞行!java
<!--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目錄下準備一個提供下載的文件：題目批量上傳Excel.xlsweb
poi工具類：spring
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讀寫工具類
*/
public class POIUtil {
private static Logger logger = Logger.getLogger(POIUtil.class);
private final static String xls = "xls";
private final static String xlsx = "xlsx";
/**
* 讀入excel文件，解析後返回
* @param file
* @throws IOException
*/
public static List<String[]> readExcel(MultipartFile file) throws IOException{
//檢查文件
checkFile(file);
//得到Workbook工做薄對象
Workbook workbook = getWorkBook(file);
//建立返回對象，把每行中的值做爲一個數組，全部行做爲一個集合返回
List<String[]> list = new ArrayList<String[]>();
if(workbook != null){
for(int sheetNum = 0;sheetNum < workbook.getNumberOfSheets();sheetNum++){
//得到當前sheet工做表
Sheet sheet = workbook.getSheetAt(sheetNum);
if(sheet == null){
continue;
}
//得到當前sheet的開始行
int firstRowNum = sheet.getFirstRowNum();
//得到當前sheet的結束行
int lastRowNum = sheet.getLastRowNum();
//循環除了第一行的全部行
for(int rowNum = firstRowNum+1;rowNum <= lastRowNum;rowNum++){
//得到當前行
Row row = sheet.getRow(rowNum);
if(row == null){
continue;
}
//得到當前行的開始列
int firstCellNum = row.getFirstCellNum();
//得到當前行的列數
int lastCellNum = row.getPhysicalNumberOfCells();
String[] cells = new String[row.getPhysicalNumberOfCells()];
//循環當前行
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{
//判斷文件是否存在
if(null == file){
logger.error("文件不存在！");
throw new FileNotFoundException("文件不存在！");
}
//得到文件名
String fileName = file.getOriginalFilename();
//判斷文件是不是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) {
//得到文件名
String fileName = file.getOriginalFilename();
//建立Workbook工做薄對象，表示整個excel
Workbook workbook = null;
try {
//獲取excel文件的io流
InputStream is = file.getInputStream();
//根據文件後綴名不一樣(xls和xlsx)得到不一樣的Workbook實現類對象
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;
}
//把數字當成String來讀，避免出現1讀成1.0的狀況
if(cell.getCellType() == Cell.CELL_TYPE_NUMERIC){
cell.setCellType(Cell.CELL_TYPE_STRING);
}
//判斷數據的類型
switch (cell.getCellType()){
case Cell.CELL_TYPE_NUMERIC: //數字
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 = "未知類型";
break;
}
return cellValue;
}
}
controller：apache
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;
//建立表頭
private void createTitle(HSSFWorkbook workbook, HSSFSheet sheet){
HSSFRow row = sheet.createRow(0);
//設置列寬，setColumnWidth的第二個參數要乘以256，這個參數的單位是1/256個字符寬度
sheet.setColumnWidth(1,12*256);
sheet.setColumnWidth(3,17*256);
//設置爲居中加粗
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("題目內容");
cell.setCellStyle(style);
//題目內容，類型，難度，維度，狀態，備註
cell = row.createCell(1);
cell.setCellValue("類型");
cell.setCellStyle(style);
cell = row.createCell(2);
cell.setCellValue("難度");
cell.setCellStyle(style);
cell = row.createCell(3);
cell.setCellValue("維度");
cell.setCellStyle(style);
cell = row.createCell(4);
cell.setCellValue("狀態");
cell.setCellStyle(style);
cell = row.createCell(5);
cell.setCellValue("備註");
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("題目批量上傳");
createTitle(workbook,sheet);
// List<SysUser> rows = sysUserService.getAll();
List<SysUser> rows = sysUserDao.findAll();
//設置日期格式
HSSFCellStyle style = workbook.createCellStyle();
style.setDataFormat(HSSFDataFormat.getBuiltinFormat("m/d/yy h:mm"));
//新增數據行，而且設置單元格數據
String fileName = "題目批量上傳Excel.xls";
//生成excel文件
buildExcelFile(fileName, workbook);
//瀏覽器下載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();
}
//瀏覽器下載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();
}
/**
* 文件下載
*/
@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("題目批量上傳Excel.xls");
body = new byte[in.available()];
in.read(body);
HttpHeaders headers = new HttpHeaders();
String fileName11 = new String("題目批量上傳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;
/**
* 文件上傳
* @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); //這裏獲得的是一個集合，裏面的每個元素是String[]數組
//TODO service實現方法
System.out.println(list);
for (int i=0;i<list.size();i++){
EvalQuestion eval = new EvalQuestion();
eval.setTitle(list.get(i)[0]);//題目
String type= list.get(i)[1];
eval.setType(GetAndSetType(type));//類型
String diffcult= list.get(i)[2];
eval.setDiffcult(GetAndSetDiffcult(diffcult));//難度
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 "簡單":
type="A";
break;
case "容易":
type="B";
break;
case "困難":
type="C";
break;
case "艱難":
type="D";
break;
}
return type;
}
private String GetAndSetType(String type){
switch (type){
case "單選題":
type="A";
break;
case "多選題":
type="B";
break;
case "排序題":
type="C";
break;
case "程度題":
type="D";
break;
case "問答題":
type="E";
break;
case "矩陣程度題":
type="F";
break;
case "拽選擇題":
type="G";
break;
}
return type;
}
}