POI

1 POI概述

1 什么是poi

? Apache POI是Apache軟件基金會的開放源碼函式庫，POI提供API給Java程序對Microsoft Office格式檔案讀和寫的功能。

2 包結構說明

• HSSF提供讀寫Microsoft Excel XLS格式檔案的功能。
• XSSF提供讀寫Microsoft Excel OOXML XLSX格式檔案的功能。
• HWPF提供讀寫Microsoft Word DOC格式檔案的功能。
• HSLF提供讀寫Microsoft PowerPoint格式檔案的功能。
• HDGF提供讀Microsoft Visio格式檔案的功能。
• HPBF提供讀Microsoft Publisher格式檔案的功能。
• HSMF提供讀Microsoft Outlook格式檔案的功能。

2 POI的使用

2.1 Excel的操作

2.2.1 jar包依賴

導入jar包–本次使用maven，所以導入pom依賴。

<dependencies><dependency><groupId>org.apache.poi</groupId><artifactId>poi</artifactId><version>3.8</version></dependency><dependency><groupId>org.apache.poi</groupId><artifactId>poi-ooxml</artifactId><version>3.8</version></dependency><dependency><groupId>org.apache.poi</groupId><artifactId>poi-ooxml-schemas</artifactId><version>3.8</version></dependency><dependency><groupId>org.apache.xmlbeans</groupId><artifactId>xmlbeans</artifactId><version>3.1.0</version></dependency><dependency><groupId>dom4j</groupId><artifactId>dom4j</artifactId><version>1.6.1</version></dependency><dependency><groupId>poi</groupId><artifactId>poi-scratchpad-2.5.1-final</artifactId><version>20040804</version></dependency> </dependencies>

2.2.2 Excel文件的導出

public static void writerExcel() throws IOException {ArrayList<Student> students = new ArrayList<>();for (int i = 0; i < 5; i++) {students.add(new Student(i+1000,"張三"+i,"男",60+Float.parseFloat(""+Math.random()*40)));}//1.創建excel對象HSSFWorkbook sheets = new HSSFWorkbook();//2.創建一個sheetHSSFSheet sheet1 = sheets.createSheet("sheet1");//4.創建行列并賦值：下標默認從0開始HSSFRow row = sheet1.createRow(0);//3.設置樣式HSSFCellStyle style = sheets.createCellStyle();style.setFillForegroundColor(IndexedColors.GREY_25_PERCENT.index);//設置圖案顏色style.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND);//設置圖案樣式String[] rows=new String[]{"序號","學號","名字","性別","成績"};for (int i = 0; i < rows.length; i++) {//HSSFCell cell = row.createCell(i);Cell cell = row.createCell(i);cell.setCellValue(rows[i]);cell.setCellStyle(style);System.out.println(cell.getCellStyle().getFillBackgroundColor());}for (int i = 0; i < students.size(); i++) {HSSFRow tempRow = sheet1.createRow(i+1);Student tempStudent = students.get(i);HSSFCell cell = tempRow.createCell(0);cell.setCellValue(i+1);tempRow.createCell(1).setCellValue(tempStudent.getId());tempRow.createCell(2).setCellValue(tempStudent.getName());tempRow.createCell(3).setCellValue(tempStudent.getSex());tempRow.createCell(4).setCellValue(tempStudent.getScore());}//5.創建關聯輸出流和文件FileOutputStream fileOutputStream = new FileOutputStream("14_poi/studentScoreBook.xls");sheets.write(fileOutputStream);fileOutputStream.close(); }

2.2.3 EXCEL文件的讀

public static void readExcel() throws IOException {//創建文件輸入流關聯表FileInputStream fileInputStream = new FileInputStream("14_poi/studentScoreBook.xls");//1.創建工作簿HSSFWorkbook sheets = new HSSFWorkbook(fileInputStream);//2.獲取工作表int numberOfSheets = sheets.getNumberOfSheets();//3.獲取每一個單元格for (int i = 0; i < numberOfSheets; i++) {HSSFSheet sheetAt = sheets.getSheetAt(i);Iterator<Row> rowIterator = sheetAt.iterator();while (rowIterator.hasNext()){//獲取一行Row rowNext = rowIterator.next();Iterator<Cell> cellIterator = rowNext.cellIterator();while (cellIterator.hasNext()){//獲取每一個單元格Cell cellNext = cellIterator.next();int cellType = cellNext.getCellType();if (cellType== HSSFCell.CELL_TYPE_NUMERIC){//日期和數字類型的if (HSSFDateUtil.isCellDateFormatted(cellNext)){Date dateCellValue = cellNext.getDateCellValue();System.out.println(dateCellValue);}else {double numericCellValue = cellNext.getNumericCellValue();System.out.println("numeric：："+numericCellValue);}}else if (cellType==HSSFCell.CELL_TYPE_BOOLEAN){boolean booleanCellValue = cellNext.getBooleanCellValue();System.out.println("boolean：："+booleanCellValue);}else{String stringCellValue = cellNext.getStringCellValue();System.out.println("其他類型使用字符串進行接收：："+stringCellValue);}}}fileInputStream.close();} }

2.2.4 文件的上傳與下載

? 需求：上傳一個文件并保存到本地磁盤中去。

@RequestMapping("/extractAllStudentToExcel") public ResponseEntity<byte[]> extractAllStudentToExcel(HttpServletRequest request) {//1.獲取全部的學生對象List<Student> allStudent = studentDao.getAllStudent();allStudent.forEach(System.out::println);//2.創建工作表HSSFWorkbook sheets = new HSSFWorkbook();HSSFSheet sheet = sheets.createSheet("學生信息表");//4.創建行列并賦值：下標默認從0開始HSSFRow row = sheet.createRow(0);//3.設置樣式String[] rows=new String[]{"序號","學號","名字","性別","成績","入學時間"};System.out.println(HSSFWorkbook.class.getProtectionDomain().getCodeSource().getLocation());for (int i = 0; i < rows.length; i++) {Cell cell = row.createCell(i);cell.setCellValue(rows[i]);}for (int i = 0; i < allStudent.size(); i++) {HSSFRow tempRow = sheet.createRow(i+1);Student tempStudent = allStudent.get(i);HSSFCell cell = tempRow.createCell(0);cell.setCellValue(i+1);tempRow.createCell(1).setCellValue(tempStudent.getId());tempRow.createCell(2).setCellValue(tempStudent.getName());tempRow.createCell(3).setCellValue(tempStudent.getSex());tempRow.createCell(4).setCellValue(tempStudent.getScore());Cell dateTemp=tempRow.createCell(5);HSSFCellStyle style4 = sheets.createCellStyle();HSSFDataFormat df = sheets.createDataFormat(); // 此處設置數據格式style4.setDataFormat(df.getFormat("yyyy-MM-dd hh:mm:ss"));dateTemp.setCellValue(tempStudent.getBirth());dateTemp.setCellStyle(style4);}//5.創建關聯輸出流和文件String fileName="學生信息.xls";String mimeType = request.getServletContext().getMimeType(fileName);MultiValueMap<String,String> headers=new HttpHeaders();headers.add("Content-Disposition","attchement;filename="+new String(fileName.getBytes(StandardCharsets.UTF_8), StandardCharsets.ISO_8859_1));System.out.println("mmeType:"+mimeType);headers.add("Content-Type", mimeType);byte[] bytes = sheets.getBytes();System.out.println(bytes);return new ResponseEntity<>(bytes, headers, HttpStatus.OK); } @RequestMapping("/saveStudentByExcel") public String saveStudentByExcel(@RequestParam(value = "file",required = false)MultipartFile file) throws IOException {if (!file.isEmpty()){InputStream inputStream = file.getInputStream();//1.創建工作簿HSSFWorkbook sheets = new HSSFWorkbook(inputStream);//2.獲取工作表Sheet sheet = sheets.getSheetAt(0);//獲取一個工作表for (int k = 1; k < sheet.getPhysicalNumberOfRows(); k++) {Row row = sheet.getRow(k);//獲取一行數據//獲取行下的所有單元格Student s = new Student();for (int j = 0; j < row.getPhysicalNumberOfCells(); j++) {Cell cell = row.getCell(j);//獲取下標為j的單元格//判斷單元格數據的類型if (cell.getCellType() == HSSFCell.CELL_TYPE_STRING) {String value = cell.getStringCellValue();if (j==2){s.setName(value);}else if(j==3){s.setSex(value);}} else if (cell.getCellType() == HSSFCell.CELL_TYPE_NUMERIC) {//數字和日期類型//判斷單元格數據的格式if (HSSFDateUtil.isCellDateFormatted(cell)) {// 處理日期格式、時間格式Date value = cell.getDateCellValue();s.setBirth(value);} else {double value = cell.getNumericCellValue();if (j == 1) {s.setId((int) value);}if (j == 4) {s.setScore((float) value);}}}}studentDao.addOne(s);}}return "success"; }

2.2 單元格的樣式設置

? HSSFCellStyle cellStyle = wb.createCellStyle();

2.3.1 設置背景色

cellStyle.setFillForegroundColor((short) 13);// 設置背景色 cellStyle.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND);

2.3.2 設置邊框

cellStyle.setBorderBottom(HSSFCellStyle.BORDER_THIN); //下邊框 cellStyle.setBorderLeft(HSSFCellStyle.BORDER_THIN);//左邊框 cellStyle.setBorderTop(HSSFCellStyle.BORDER_THIN);//上邊框 cellStyle.setBorderRight(HSSFCellStyle.BORDER_THIN);//右邊框

2.3.3 設置居中:

cellStyle.setAlignment(HSSFCellStyle.ALIGN_CENTER); // 居中

2.3.4 設置字體:

HSSFFont font = wb.createFont(); font.setFontName("黑體"); font.setFontHeightInPoints((short) 16);//設置字體大小 HSSFFont font2 = wb.createFont(); font2.setFontName("仿宋_GB2312"); font2.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);//粗體顯示 font2.setFontHeightInPoints((short) 12); cellStyle.setFont(font);//選擇需要用到的字體格式

2.3.5 設置列寬:

sheet.setColumnWidth(0, 3766); //第一個參數代表列id(從0開始),第2個參數代表寬度值 參考 ："2012-08-10"的寬度為2500

2.3.6 設置自動換行:

cellStyle.setWrapText(true);//設置自動換行

2.3.7 合并單元格:

Region region1 = new Region(0, (short) 0, 0, (short) 6);//參數1：行號 參數2：起始列號 參數3：行號 參數4：終止列號 //此方法在POI3.8中已經被廢棄，建議使用下面一個 或者用 CellRangeAddress region1 = new CellRangeAddress(rowNumber, rowNumber, (short) 0, (short) 11); //參數1：起始行 參數2：終止行 參數3：起始列 參數4：終止列 但應注意兩個構造方法的參數不是一樣的，具體使用哪個取決于POI的不同版本。 sheet.addMergedRegion(region1);

總結

以上是生活随笔為你收集整理的2.excel导出-poi使用的全部內容，希望文章能夠幫你解決所遇到的問題。

如果覺得生活随笔網站內容還不錯，歡迎將生活随笔推薦給好友。