Java後端實現Excel導出，及添加Excel文件標題樣式

簡單Java實現Excel文件導出

Java導出要在action層（controller層）中操作
需要到的jar包：

後端代碼：
後面兩個函數都是設置Excel文件裏的標題樣式，專注第一個方法就可以了

/**
	 * 導出房產信息
	 * @param fcHouseProMain
	 * @param request
	 * @param response
	 * @param redirectAttributes
	 * @return
	 */
	@RequiresPermissions("housepro:fcHouseProMain:view")
    @RequestMapping(value = "export", method=RequestMethod.POST)
    public String exportFile(FcHouseProMain fcHouseProMain, HttpServletRequest request, HttpServletResponse response, RedirectAttributes redirectAttributes) {
		try {
            String fileName = "房產信息"+DateUtils.getDate("yyyyMMddHHmmss")+".xlsx";
            /*List<FcHouseProMain> list = fcHouseProMainService.findList(fcHouseProMain);
    		new ExportExcel("房產信息", FcHouseProMain.class).setDataList(list).write(response, fileName).dispose();*/
			SXSSFWorkbook wb = new SXSSFWorkbook(500);
			Sheet sheet = wb.createSheet("Export");
			Map<String, CellStyle> styles = createStyles(wb);
			String str[] = {"ID","名稱"};
			initialize("房產信息",Arrays.asList(str),wb,sheet,styles);
			for (int i = 0; i <2; i++) {
				Row row = sheet.createRow(rownum++);
				Cell ce1 = row.createCell(0);
				ce1.setCellValue("100"+(i+1));
				Cell ce2 = row.createCell(1);
				ce2.setCellValue("張三"+(i+1));
			}
			
			OutputStream out = response.getOutputStream();
			response.reset();
	        response.setContentType("application/octet-stream; charset=utf-8");
	        response.setHeader("Content-Disposition", "attachment; filename="+Encodes.urlEncode(fileName));
			wb.write(out);
			wb.dispose();
			out.flush();
			out.close();
    		return null;
		} catch (Exception e) {
			addMessage(redirectAttributes, "導出房產信息失敗！失敗信息："+e.getMessage());
		}
		return "redirect:"+Global.getAdminPath()+"/housepro/fcHouseProMain/?repage";
    }
	/**
	 * 當前行號
	 */
	private int rownum;
	private void initialize(String title, List<String> headerList,SXSSFWorkbook wb,Sheet sheet,Map<String, CellStyle> styles) {
		// Create title
		if (StringUtils.isNotBlank(title)){
			Row titleRow = sheet.createRow(rownum++);
			titleRow.setHeightInPoints(30);
			Cell titleCell = titleRow.createCell(0);
			titleCell.setCellStyle(styles.get("title"));
			titleCell.setCellValue(title);
			sheet.addMergedRegion(new CellRangeAddress(titleRow.getRowNum(),
					titleRow.getRowNum(), titleRow.getRowNum(), headerList.size()-1));
		}
		// Create header
		if (headerList == null){
			throw new RuntimeException("headerList not null!");
		}
		Row headerRow = sheet.createRow(rownum++);
		headerRow.setHeightInPoints(16);
		for (int i = 0; i < headerList.size(); i++) {
			Cell cell = headerRow.createCell(i);
			cell.setCellStyle(styles.get("header"));
			String[] ss = StringUtils.split(headerList.get(i), "**", 2);
			if (ss.length==2){
				cell.setCellValue(ss[0]);
				Comment comment = sheet.createDrawingPatriarch().createCellComment(
						new XSSFClientAnchor(0, 0, 0, 0, (short) 3, 3, (short) 5, 6));
				comment.setString(new XSSFRichTextString(ss[1]));
				cell.setCellComment(comment);
			}else{
				cell.setCellValue(headerList.get(i));
			}
			sheet.autoSizeColumn(i);
		}
		for (int i = 0; i < headerList.size(); i++) {  
			int colWidth = sheet.getColumnWidth(i)*2;
	        sheet.setColumnWidth(i, colWidth < 3000 ? 3000 : colWidth);  
		}
	}
	
	/**
	 * 創建表格樣式
	 * @param wb 工作薄對象
	 * @return 樣式列表
	 */
	private Map<String, CellStyle> createStyles(Workbook wb) {
		Map<String, CellStyle> styles = new HashMap<String, CellStyle>();
		
		CellStyle style = wb.createCellStyle();
		style.setAlignment(CellStyle.ALIGN_CENTER);
		style.setVerticalAlignment(CellStyle.VERTICAL_CENTER);
		Font titleFont = wb.createFont();
		titleFont.setFontName("Arial");
		titleFont.setFontHeightInPoints((short) 16);
		titleFont.setBoldweight(Font.BOLDWEIGHT_BOLD);
		style.setFont(titleFont);
		styles.put("title", style);

		style = wb.createCellStyle();
		style.setVerticalAlignment(CellStyle.VERTICAL_CENTER);
		style.setBorderRight(CellStyle.BORDER_THIN);
		style.setRightBorderColor(IndexedColors.GREY_50_PERCENT.getIndex());
		style.setBorderLeft(CellStyle.BORDER_THIN);
		style.setLeftBorderColor(IndexedColors.GREY_50_PERCENT.getIndex());
		style.setBorderTop(CellStyle.BORDER_THIN);
		style.setTopBorderColor(IndexedColors.GREY_50_PERCENT.getIndex());
		style.setBorderBottom(CellStyle.BORDER_THIN);
		style.setBottomBorderColor(IndexedColors.GREY_50_PERCENT.getIndex());
		Font dataFont = wb.createFont();
		dataFont.setFontName("Arial");
		dataFont.setFontHeightInPoints((short) 10);
		style.setFont(dataFont);
		styles.put("data", style);
		
		style = wb.createCellStyle();
		style.cloneStyleFrom(styles.get("data"));
		style.setAlignment(CellStyle.ALIGN_LEFT);
		styles.put("data1", style);

		style = wb.createCellStyle();
		style.cloneStyleFrom(styles.get("data"));
		style.setAlignment(CellStyle.ALIGN_CENTER);
		styles.put("data2", style);

		style = wb.createCellStyle();
		style.cloneStyleFrom(styles.get("data"));
		style.setAlignment(CellStyle.ALIGN_RIGHT);
		styles.put("data3", style);
		
		style = wb.createCellStyle();
		style.cloneStyleFrom(styles.get("data"));
//		style.setWrapText(true);
		style.setAlignment(CellStyle.ALIGN_CENTER);
		style.setFillForegroundColor(IndexedColors.GREY_50_PERCENT.getIndex());
		style.setFillPattern(CellStyle.SOLID_FOREGROUND);
		Font headerFont = wb.createFont();
		headerFont.setFontName("Arial");
		headerFont.setFontHeightInPoints((short) 10);
		headerFont.setBoldweight(Font.BOLDWEIGHT_BOLD);
		headerFont.setColor(IndexedColors.WHITE.getIndex());
		style.setFont(headerFont);
		styles.put("header", style);
		
		return styles;
	}