JAVA實現資料庫資料匯入/匯出到Excel（POI技術）
阿新 • • 發佈：2019-01-05
準備工作：
1.匯入POI包：POI下載地址：http://download.csdn.net/detail/zxm1306192988/9522142（重要）
如下
2.匯入匯出到Excel工具類ExcelUtil.java，封裝了POI對Excel的操作
package net.dqsy.util; import java.io.File; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.IOException; import javax.swing.JOptionPane; import org.apache.poi.hssf.usermodel.HSSFCell; import org.apache.poi.hssf.usermodel.HSSFCellStyle; import org.apache.poi.hssf.usermodel.HSSFRow; import org.apache.poi.hssf.usermodel.HSSFSheet; import org.apache.poi.hssf.usermodel.HSSFWorkbook; import org.apache.poi.hssf.util.HSSFCellUtil; import org.apache.poi.ss.usermodel.Cell; import org.apache.poi.ss.usermodel.CellStyle; import org.apache.poi.ss.usermodel.Font; import org.apache.poi.ss.usermodel.Row; import org.apache.poi.ss.util.CellRangeAddress; /** * 描述：Excel寫操作幫助類 * * * */ public class ExcelUtil { /** * 功能：建立HSSFSheet工作簿 * @param wb HSSFWorkbook * @param sheetName String * @return HSSFSheet */ public static HSSFSheet createSheet(HSSFWorkbook wb,String sheetName){ HSSFSheet sheet=wb.createSheet(sheetName); sheet.setDefaultColumnWidth(12); sheet.setGridsPrinted(false); sheet.setDisplayGridlines(false); return sheet; } /** * 功能：建立HSSFRow * @param sheet HSSFSheet * @param rowNum int * @param height int * @return HSSFRow */ public static HSSFRow createRow(HSSFSheet sheet,int rowNum,int height){ HSSFRow row=sheet.createRow(rowNum); row.setHeight((short)height); return row; } public static HSSFCell createCell0(HSSFRow row,int cellNum){ HSSFCell cell=row.createCell(cellNum); return cell; } /** * 功能：建立CELL * @param row HSSFRow * @param cellNum int * @param style HSSFStyle * @return HSSFCell */ public static HSSFCell createCell(HSSFRow row,int cellNum,CellStyle style){ HSSFCell cell=row.createCell(cellNum); cell.setCellStyle(style); return cell; } /** * 功能：建立CellStyle樣式 * @param wb HSSFWorkbook * @param backgroundColor 背景色 * @param foregroundColor 前置色 * @param font 字型 * @return CellStyle */ public static CellStyle createCellStyle(HSSFWorkbook wb,short backgroundColor,short foregroundColor,short halign,Font font){ CellStyle cs=wb.createCellStyle(); cs.setAlignment(halign); cs.setVerticalAlignment(CellStyle.VERTICAL_CENTER); cs.setFillBackgroundColor(backgroundColor); cs.setFillForegroundColor(foregroundColor); cs.setFillPattern(CellStyle.SOLID_FOREGROUND); cs.setFont(font); return cs; } /** * 功能：建立帶邊框的CellStyle樣式 * @param wb HSSFWorkbook * @param backgroundColor 背景色 * @param foregroundColor 前置色 * @param font 字型 * @return CellStyle */ public static CellStyle createBorderCellStyle(HSSFWorkbook wb,short backgroundColor,short foregroundColor,short halign,Font font){ CellStyle cs=wb.createCellStyle(); cs.setAlignment(halign); cs.setVerticalAlignment(CellStyle.VERTICAL_CENTER); cs.setFillBackgroundColor(backgroundColor); cs.setFillForegroundColor(foregroundColor); cs.setFillPattern(CellStyle.SOLID_FOREGROUND); cs.setFont(font); cs.setBorderLeft(CellStyle.BORDER_DASHED); cs.setBorderRight(CellStyle.BORDER_DASHED); cs.setBorderTop(CellStyle.BORDER_DASHED); cs.setBorderBottom(CellStyle.BORDER_DASHED); return cs; } /** * 功能：多行多列匯入到Excel並且設定標題欄格式 */ public static void writeArrayToExcel(HSSFSheet sheet,int rows,int cells,Object [][]value){ Row row[]=new HSSFRow[rows]; Cell cell[]=new HSSFCell[cells]; for(int i=0;i<row.length;i++){ row[i]=sheet.createRow(i); for(int j=0;j<cell.length;j++){ cell[j]=row[i].createCell(j); cell[j].setCellValue(convertString(value[i][j])); } } } /** * 功能：多行多列匯入到Excel並且設定標題欄格式 */ public static void writeArrayToExcel(HSSFWorkbook wb,HSSFSheet sheet,int rows,int cells,Object [][]value){ Row row[]=new HSSFRow[rows]; Cell cell[]=new HSSFCell[cells]; HSSFCellStyle ztStyle = (HSSFCellStyle)wb.createCellStyle(); Font ztFont = wb.createFont(); ztFont.setBoldweight(Font.BOLDWEIGHT_BOLD); //ztFont.setItalic(true); // 設定字型為斜體字 // ztFont.setColor(Font.COLOR_RED); // 將字型設定為“紅色” ztFont.setFontHeightInPoints((short)10); // 將字型大小設定為18px ztFont.setFontName("華文行楷"); // 將“華文行楷”字型應用到當前單元格上 // ztFont.setUnderline(Font.U_DOUBLE); ztStyle.setFont(ztFont); for(int i=0;i<row.length;i++){ row[i]=sheet.createRow(i); for(int j=0;j<cell.length;j++){ cell[j]=row[i].createCell(j); cell[j].setCellValue(convertString(value[i][j])); if(i==0) cell[j].setCellStyle(ztStyle); } } } /** * 功能：合併單元格 * @param sheet HSSFSheet * @param firstRow int * @param lastRow int * @param firstColumn int * @param lastColumn int * @return int 合併區域號碼 */ public static int mergeCell(HSSFSheet sheet,int firstRow,int lastRow,int firstColumn,int lastColumn){ return sheet.addMergedRegion(new CellRangeAddress(firstRow,lastRow,firstColumn,lastColumn)); } /** * 功能：建立字型 * @param wb HSSFWorkbook * @param boldweight short * @param color short * @return Font */ public static Font createFont(HSSFWorkbook wb,short boldweight,short color,short size){ Font font=wb.createFont(); font.setBoldweight(boldweight); font.setColor(color); font.setFontHeightInPoints(size); return font; } /** * 設定合併單元格的邊框樣式 * @param sheet HSSFSheet * @param ca CellRangAddress * @param style CellStyle */ public static void setRegionStyle(HSSFSheet sheet, CellRangeAddress ca,CellStyle style) { for (int i = ca.getFirstRow(); i <= ca.getLastRow(); i++) { HSSFRow row = HSSFCellUtil.getRow(i, sheet); for (int j = ca.getFirstColumn(); j <= ca.getLastColumn(); j++) { HSSFCell cell = HSSFCellUtil.getCell(row, j); cell.setCellStyle(style); } } } /** * 功能：將HSSFWorkbook寫入Excel檔案 * @param wb HSSFWorkbook * @param absPath 寫入檔案的相對路徑 * @param wbName 檔名 */ public static void writeWorkbook(HSSFWorkbook wb,String fileName){ FileOutputStream fos=null; File f=new File(fileName); try { fos=new FileOutputStream(f); wb.write(fos); int dialog = JOptionPane.showConfirmDialog(null, f.getName()+"匯出成功！是否開啟？", "溫馨提示", JOptionPane.YES_NO_OPTION); if (dialog == JOptionPane.YES_OPTION) { Runtime.getRuntime().exec("cmd /c start \"\" \"" + fileName + "\""); } } catch (FileNotFoundException e) { JOptionPane.showMessageDialog(null, "匯入資料前請關閉工作表"); } catch ( Exception e) { JOptionPane.showMessageDialog(null, "沒有進行篩選"); } finally{ try { if(fos!=null){ fos.close(); } } catch (IOException e) { } } } public static String convertString(Object value) { if (value == null) { return ""; } else { return value.toString(); } } }
3.匯出Excel
4.匯入ExcelJButton toExcelButton = new JButton("匯出excel"); toExcelButton.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent arg0) { // TODO Auto-generated method stub File selectedFile = getSelectedFile(".xls"); if (selectedFile != null) { String path = selectedFile.getPath(); // System.out.println(path); HSSFWorkbook wb = new HSSFWorkbook(); HSSFSheet sheet = wb.createSheet("試卷"); String[] n = { "題幹", "A", "B", "C", "D", "Answer" }; Object[][] value = new Object[questionInfos.size() + 1][6]; for (int m = 0; m < n.length; m++) { value[0][m] = n[m]; } for (int i = 0; i < questionInfos.size(); i++) { value[i + 1][0] = questionInfos.get(i).getQuestion(); value[i + 1][1] = questionInfos.get(i).getA(); value[i + 1][2] = questionInfos.get(i).getB(); value[i + 1][3] = questionInfos.get(i).getC(); value[i + 1][4] = questionInfos.get(i).getD(); value[i + 1][5] = questionInfos.get(i).getAnswer(); } ExcelUtil.writeArrayToExcel(wb, sheet, questionInfos.size() + 1, 6, value); ExcelUtil.writeWorkbook(wb, path); } } });
JButton fromExcelButton = new JButton("匯入excel"); fromExcelButton.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent arg0) { // TODO Auto-generated method stub File selectedFile = getSelectedOpenFile(".xls"); if (selectedFile != null) { String path = selectedFile.getPath(); String result = "success"; try { // 建立對Excel工作簿檔案的引用 HSSFWorkbook workbook = new HSSFWorkbook(new FileInputStream( path)); // 建立對工作表的引用。 // HSSFSheet sheet = workbook.getSheet("Sheet1"); HSSFSheet sheet = workbook.getSheetAt(0); int j = 1;//從第2行開始堵資料 // 第在excel中讀取一條資料就將其插入到資料庫中 while (j < sheet.getPhysicalNumberOfRows()) { HSSFRow row = sheet.getRow(j); QuestionInfo onequestioninfo = new QuestionInfo(null, null, null, null, null, null,GlobalInfo.selectedpaper); for (int i = 0; i <= 5; i++) { HSSFCell cell = row.getCell((short) i); if (i == 0) { onequestioninfo.setQuestion(cell.getStringCellValue()); } else if (i == 1){ onequestioninfo.setA(cell.getStringCellValue()); } else if (i == 2){ onequestioninfo.setB(cell.getStringCellValue()); } else if (i == 3){ onequestioninfo.setC(cell.getStringCellValue()); } else if (i == 4){ onequestioninfo.setD(cell.getStringCellValue()); } else if (i == 5){ onequestioninfo.setAnswer(cell.getStringCellValue()); } } j++; jdbc.addQuestionInfo(onequestioninfo); } } catch (FileNotFoundException e2) { // TODO Auto-generated catch block System.out.println("notfound"); e2.printStackTrace(); } catch (IOException e3) { // TODO Auto-generated catch block System.out.println(e3.toString()); e3.printStackTrace(); } } } });