java集成poi框架

介绍 : Apache POI是Apache软件基金会的开放源码函式库，POI提供API给Java程序对Microsoft Office格式档案读和写的功能。

下面简单介绍一下如何使用该框架：

一：导入依赖

 <!--        excel解析依赖--><dependency><groupId>org.apache.poi</groupId><artifactId>poi</artifactId><version>${org.poi-version}</version></dependency><dependency><groupId>org.apache.poi</groupId><artifactId>poi-ooxml</artifactId><version>${org.poi-version}</version></dependency><dependency><groupId>org.apache.poi</groupId><artifactId>poi-examples</artifactId><version>${org.poi-version}</version></dependency><dependency><groupId>org.apache.poi</groupId><artifactId>poi-excelant</artifactId><version>${org.poi-version}</version></dependency><!-- https://mvnrepository.com/artifact/com.monitorjbl/xlsx-streamer --><dependency><groupId>com.monitorjbl</groupId><artifactId>xlsx-streamer</artifactId><version>2.1.0</version></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-test</artifactId></dependency><!--阿里巴巴EasyExcel依赖--><dependency><groupId>com.alibaba</groupId><artifactId>easyexcel</artifactId><version>3.0.5</version></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-configuration-processor</artifactId><optional>true</optional></dependency><dependency><groupId>junit</groupId><artifactId>junit</artifactId><scope>test</scope></dependency><dependency><groupId>cn.hutool</groupId><artifactId>hutool-all</artifactId><version>${hutool.version}</version></dependency><!--        <dependency>--><!--            <groupId>org.projectlombok</groupId>--><!--            <artifactId>lombok</artifactId>--><!--        </dependency>--><dependency><groupId>org.projectlombok</groupId><artifactId>lombok</artifactId></dependency><dependency><groupId>com.hynnet</groupId><artifactId>jxl</artifactId><version>2.6.12.1</version></dependency><!-- https://mvnrepository.com/artifact/com.bulucat/BeautyEye --><dependency><groupId>com.bulucat</groupId><artifactId>BeautyEye</artifactId><version>1.0.0</version></dependency><dependency><groupId>com.alibaba</groupId><artifactId>druid-spring-boot-starter</artifactId><version>1.1.21</version></dependency><dependency><groupId>javax.annotation</groupId><artifactId>javax.annotation-api</artifactId><version>1.3.2</version></dependency>

二：创建实体类及dao层（查询得到结果集封装在list中即可，此处不做过多赘述）

三：在serviceImpl中处理结果集

 @AutowiredDbToExcelDao dbToExcelDao;@Overridepublic List<String[]> getAllCity(QueryDto dto) {List<CityInfo> cityInfoList = dbToExcelDao.getAllCity(dto);List<String[]> result=new ArrayList<>();for (CityInfo cityInfo : cityInfoList) {String[] cityInfoArr = new String[7];//将查询到的结果集转换成字符串存入字符串数组中cityInfoArr[0] = xxx;cityInfoArr[1] = xxx;cityInfoArr[2] = xxx;cityInfoArr[3] = xxx;cityInfoArr[4] = xxx;//将该字符串数组存入list中result.add(cityInfoArr);}return result;}

四：在controller中调用service对象使用poi工具类导出表格。

import org.apache.poi.hssf.usermodel.*;
import org.apache.poi.hssf.util.HSSFColor;
import org.apache.poi.ss.usermodel.*;
import org.apache.poi.xssf.usermodel.XSSFCellStyle;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.springframework.web.multipart.MultipartFile;import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.text.DecimalFormat;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import java.util.UUID;/***** 文件导入导出工具类***/
public class ExcelUtils {/*** 导出excel文件的方法** @param titles 输出到excel的表头* @param datas  数据库的表中的数据 集合对象* @param out excel(File) 输出到指定的路径 (OutPutStream)*/public static void export(List<String[]> titles, List<List<String[]>> datas, OutputStream out) {// 创建工作表HSSFWorkbook work = new HSSFWorkbook();for (int k = 0;k<datas.size();k++){String sheetname = "";// 创建sheet表if(k == 0){if(datas.size() > 1){sheetname = "xxx";//sheet名}else {sheetname = "xxx";//sheet名}}else if(k == 1){sheetname = "xxx";//sheet名}else if(k == 2){sheetname = "xxx";//sheet名}HSSFSheet sheet = work.createSheet(sheetname);// 创建表头【表头数据来源】Row headRow = sheet.createRow(0);// 循环输出标题for (int i = 0; i < titles.get(k).length; i++) {// 设置字体HSSFCellStyle redStyle = work.createCellStyle();
//           CellStyle redStyle = work.createCellStyle();HSSFFont redFont = work.createFont();//字体颜色redFont.setColor((short) 9);//设置字体大小redFont.setFontHeightInPoints((short) 10);//字体样式redFont.setFontName("Microsoft YaHei");//加粗redFont.setBold(true);redStyle.setFont(redFont);//设置居中redStyle.setAlignment(HorizontalAlignment.CENTER);redStyle.setVerticalAlignment(VerticalAlignment.CENTER);//背景色redStyle.setFillForegroundColor(IndexedColors.BLACK.getIndex());redStyle.setFillPattern(FillPatternType.SOLID_FOREGROUND);// 上薄边框redStyle.setBorderTop(BorderStyle.THIN);// 下薄边框redStyle.setBorderBottom(BorderStyle.THIN);// 左薄边框redStyle.setBorderLeft(BorderStyle.THIN);// 右薄边框redStyle.setBorderRight(BorderStyle.THIN);// 下边框：黑色redStyle.setBottomBorderColor(IndexedColors.BLACK.getIndex());// 右边框：黑色redStyle.setRightBorderColor(IndexedColors.BLACK.getIndex());// 左边框：黑色redStyle.setLeftBorderColor(IndexedColors.BLACK.getIndex());// 上边框：黑色redStyle.setTopBorderColor(IndexedColors.BLACK.getIndex());//创建cell,嵌入样式Cell cell = headRow.createCell(i);cell.setCellStyle(redStyle);cell.setCellValue(titles.get(k)[i]); // 设置cell中的内容}// 表体内容// 设置表体内容 嵌套循环for (int row = 0; row < datas.get(k).size(); row++) {// 创建行HSSFRow sheetRow = sheet.createRow(row + 1);// 循环 创建列for (int c = 0; c < datas.get(k).get(row).length; c++) {sheet.autoSizeColumn(c, true);// 设置字体HSSFCellStyle redStyle = work.createCellStyle();
//           CellStyle redStyle = work.createCellStyle();HSSFFont redFont = work.createFont();//字体颜色redFont.setColor((short) 8);//设置字体大小redFont.setFontHeightInPoints((short) 10);//字体样式redFont.setFontName("等线");//加粗
//                redFont.setBold(true);redStyle.setFont(redFont);//设置居中redStyle.setAlignment(HorizontalAlignment.CENTER);redStyle.setVerticalAlignment(VerticalAlignment.CENTER);//背景色
//                redStyle.setFillForegroundColor(IndexedColors.BLACK.getIndex());
//                redStyle.setFillPattern(FillPatternType.SOLID_FOREGROUND);// 上薄边框redStyle.setBorderTop(BorderStyle.THIN);// 下薄边框
//                    if(row == datas.size()){redStyle.setBorderBottom(BorderStyle.THIN);
//                    }// 左薄边框redStyle.setBorderLeft(BorderStyle.THIN);// 右薄边框
//                    if(c == datas.get(k).get(row).length-1){redStyle.setBorderRight(BorderStyle.THIN);
//                    }// 下边框：黑色redStyle.setBottomBorderColor(IndexedColors.BLACK.getIndex());// 右边框：黑色redStyle.setRightBorderColor(IndexedColors.BLACK.getIndex());// 左边框：黑色redStyle.setLeftBorderColor(IndexedColors.BLACK.getIndex());// 上边框：黑色redStyle.setTopBorderColor(IndexedColors.BLACK.getIndex());HSSFCell sheetCell = sheetRow.createCell(c);sheetCell.setCellStyle(redStyle);// 设置内容sheetCell.setCellValue(datas.get(k).get(row)[c]);}}}// 创建完成后，内存创建的Excel输出到文件中try {work.write(out);out.flush();out.close();} catch (IOException e) {e.printStackTrace();}}/***  导入excel文件的方法**  suffix: 传入excel的后缀名*      excel  2003版的后缀为(xls) HSSFWorkbook  2007版的后缀为(xlsx)XSSFWorkbook*  fis :   通过输入流来读取excel的内容*  startRow: 读取内容的起始行**  @return 返回导入的数据    List<String[]>**/public static List<String[]> importData(MultipartFile file, int startrow) {List<String[]> datas = new ArrayList<String[]>();// 创建表格对象Workbook work = null;try {//获取文件流对象InputStream fis = file.getInputStream();//获取文件的后缀String suffix = file.getOriginalFilename().substring(file.getOriginalFilename().lastIndexOf("."));// 判断后缀名if (suffix.equals(".xls")) {work = new HSSFWorkbook(fis); // 2003的工作表对象} else if (suffix.equals(".xlsx")) { //work = new XSSFWorkbook(fis); // 2007的工作表对象} else {return null;}} catch (IOException e) {e.printStackTrace();}// 获取sheet表格Sheet sheet = work.getSheetAt(0);if (sheet == null) { // 代表一个sheet表格也没有return null;}// 获取一共多少行int rownum = sheet.getLastRowNum();if (rownum == 0 || rownum+1 == startrow) {return null;}for (int i = startrow; i <= rownum; i++) {// 获取行Row row = sheet.getRow(i);// 获取列short first = row.getFirstCellNum(); //起始列的下标short num = row.getLastCellNum();    //终止列的下标String[] cols = new String[num];    //存放当前行所有的列内容for (int j = first; j < num; j++) {// 处理列对象Cell cell = row.getCell(j);
//                if(j == 10){
//                    String[] dates = row.getCell(7).toString().split("-");
//                    String year = dates[2];
//                    String  month = dates[1].substring(0,dates[1].length()-1);
//                    //获取年份差
//                    int yx = Integer.parseInt(row.getCell(1).toString().substring(0,4) )- Integer.parseInt(year);
//                    //获取月份差
//                    int mx = Integer.parseInt(row.getCell(1).toString().substring(4,6)) - Integer.parseInt(month);
//                    cols[j] = yx*12+mx+1 + "";
//                    continue;
//                }//获取指定列的内容， 都转换为String类型cols[j] = parseCell(cell);}datas.add(cols);  //列处理完成以后，把该行所有列添加集合中}return datas;}// 转换类型private static String parseCell(Cell cell) {String cellValue = "";if(cell == null){return null;}//判断如果是String类型 则去除空格if (cell.getCellTypeEnum() == CellType.STRING) {cellValue = cell.getStringCellValue().trim();} else if (cell.getCellTypeEnum() == CellType.BOOLEAN) { //如果是boolean类型则获取boolean类型的值cellValue = String.valueOf(cell.getBooleanCellValue());} else if (cell.getCellTypeEnum() == CellType.NUMERIC) { //如果是数字类型， 则判断是日期类型还是普通数字if (HSSFDateUtil.isCellDateFormatted(cell)) { // 判断日期类型double d = cell.getNumericCellValue();Date date = HSSFDateUtil.getJavaDate(d);cellValue = new SimpleDateFormat("yyyy-MM-dd").format(date);} else { // 否cellValue = new DecimalFormat("#.######").format(cell.getNumericCellValue());}} else {cellValue = "";}return cellValue;}//图片处理public static List<String> savePic(InputStream fis) throws Exception {HSSFWorkbook workbook = (HSSFWorkbook) WorkbookFactory.create(fis);List<HSSFPictureData> pictures = workbook.getAllPictures();HSSFSheet sheet = workbook.getSheetAt(0);List<String> picList = new ArrayList<>();for (HSSFShape shape : sheet.getDrawingPatriarch().getChildren()) {HSSFClientAnchor anchor = (HSSFClientAnchor) shape.getAnchor();if (shape instanceof HSSFPicture) {HSSFPicture pic = (HSSFPicture) shape;int row = anchor.getRow1();int pictureIndex = pic.getPictureIndex() - 1;HSSFPictureData picData = pictures.get(pictureIndex);//获取文件后缀String ext = picData.suggestFileExtension();//获取图片内容byte[] data = picData.getData();//通过文件流将图片写入到指定的位置String filename = UUID.randomUUID().toString().replace("-", "");FileOutputStream out = new FileOutputStream("D:\\upload\\"+ filename +"."+ext);out.write(data);out.close();picList.add(filename+"."+ext);}}return picList;}
}

    @AutowiredDbToExcelService dbToExcelService;//导出结果表@RequestMapping("export")public void exportFileReconnect(HttpServletResponse res,QueryDto querydto) throws IOException {//定义添加标题String[] title1={"xx","xx","xx","xx","xx"};List<String[]> title = new ArrayList<>();title.add(title1);//定义添加内容,也可以存入多个list，作一个表中的不同sheetList<String[]> list1 = dbToExcelService.getAllReconnect(querydto);List<List<String[]>> list = new LinkedList<>();list.add(list1);//设置响应头，告知浏览器是下载操作res.setHeader("Content-Disposition","attachment;filename=futongtongji.xls");//设置MIME类型res.setContentType("application/vnd.ms-excel");//这里要传递的字节流数据,excel为字节流文件ExcelUtils.export(title,list,res.getOutputStream());}@AutowiredExcelToDbService excelToDbService;//文件导入数据库@RequestMapping("import")@ResponseBodypublic ResultData importFile(MultipartFile file) throws Exception {//获取excel的数据List<String[]> list = ExcelUtils.importData(file, 1);//获取excel中图片的数据List<String> strings = ExcelUtils.savePic(file.getInputStream());for (int i = 0; i < list.size(); i++) {//将图片数据渲染到excel表格中list.get(i)[1]= strings.get(i);}//上传数据就是一个增加的过程ResultData resultData = excelToDbService.insertAll(list);return resultData;}