- /**
- * @Title export
- * @Description 導出
- * @param mapping
- * @param form
- * @param request
- * @param response
- * @return
- * @throws Exception
- * @date Dec 11, 2012
- */
- public ActionForward export(ActionMapping mapping, ActionForm form,
- HttpServletRequest request, HttpServletResponse response)
- throws Exception {
- String[] headers = new String[] { "工單ID", "系統編碼", "工單類型", "來源", "來源編號",
- "訂單編號", "配送編號", "配送單狀態", " 訂單客戶名稱", "工單狀態", "客戶羣類型", "創建人",
- "創建時間", "提交時間", "代理商名稱", "代理商工號", "反饋時間", "完成時間", "用戶要求描述",
- "物流反饋情況", "客戶級別", "完成時限", "超時標識" };
- // 寫完後,輸出此文件
- response.setContentType("application/vnd.ms-excel");
- response.setHeader("Content-Disposition", "attachment;filename="
- + URLEncoder.encode("exportFeedbackOrders", "UTF8"));
- List<T> wlgdList = wlgdService.exportWlgdList(null); //記得後臺獲取結果使用泛型獲取
- // 寫入Excel
- exportToExcel("測試POI導出EXCEL文檔", headers, wlgdList, response
- .getOutputStream(), "");
- return null;
- }
- /**
- *
- * @Title exportExcel
- * @Description 導出excel,利用了Java的反射原理
- * @param title
- * @param headers
- * @param dataset
- * @param out
- * @param pattern
- * @date Dec 11, 2012
- */
- @SuppressWarnings( { "unchecked", "deprecation" })
- public void exportToExcel(String title, String[] headers,
- Collection<T> dataset, OutputStream out, String pattern) {
- // 聲明一個工作薄
- HSSFWorkbook workbook = new HSSFWorkbook();
- // 生成一個表格
- HSSFSheet sheet = workbook.createSheet(title);
- // 設置表格默認列寬度爲15個字節
- sheet.setDefaultColumnWidth((short) 15);
- // 生成一個樣式
- HSSFCellStyle style = workbook.createCellStyle();
- // 設置這些樣式
- style.setFillForegroundColor(HSSFColor.SKY_BLUE.index);
- style.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND);
- style.setBorderBottom(HSSFCellStyle.BORDER_THIN);
- style.setBorderLeft(HSSFCellStyle.BORDER_THIN);
- style.setBorderRight(HSSFCellStyle.BORDER_THIN);
- style.setBorderTop(HSSFCellStyle.BORDER_THIN);
- style.setAlignment(HSSFCellStyle.ALIGN_CENTER);
- // 生成一個字體
- HSSFFont font = workbook.createFont();
- font.setColor(HSSFColor.VIOLET.index);
- font.setFontHeightInPoints((short) 12);
- font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);
- // 把字體應用到當前的樣式
- style.setFont(font);
- // 生成並設置另一個樣式
- HSSFCellStyle style2 = workbook.createCellStyle();
- style2.setFillForegroundColor(HSSFColor.LIGHT_YELLOW.index);
- style2.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND);
- style2.setBorderBottom(HSSFCellStyle.BORDER_THIN);
- style2.setBorderLeft(HSSFCellStyle.BORDER_THIN);
- style2.setBorderRight(HSSFCellStyle.BORDER_THIN);
- style2.setBorderTop(HSSFCellStyle.BORDER_THIN);
- style2.setAlignment(HSSFCellStyle.ALIGN_CENTER);
- style2.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);
- // 生成另一個字體
- HSSFFont font2 = workbook.createFont();
- font2.setBoldweight(HSSFFont.BOLDWEIGHT_NORMAL);
- // 把字體應用到當前的樣式
- style2.setFont(font2);
- // 聲明一個畫圖的頂級管理器
- HSSFPatriarch patriarch = sheet.createDrawingPatriarch();
- // 定義註釋的大小和位置,詳見文檔
- HSSFComment comment = patriarch.createComment(new HSSFClientAnchor(0,
- 0, 0, 0, (short) 4, 2, (short) 6, 5));
- // 設置註釋內容
- comment.setString(new HSSFRichTextString("可以在POI中添加註釋!"));
- // 設置註釋作者,當鼠標移動到單元格上是可以在狀態欄中看到該內容.
- comment.setAuthor("leno");
- // 產生表格標題行
- HSSFRow row = sheet.createRow(0);
- for (short i = 0; i < headers.length; i++) {
- HSSFCell cell = row.createCell(i);
- cell.setCellStyle(style);
- HSSFRichTextString text = new HSSFRichTextString(headers[i]);
- cell.setCellValue(text);
- }
- // 遍歷集合數據,產生數據行
- Iterator<T> it = dataset.iterator();
- int index = 0;
- while (it.hasNext()) {
- index++;
- row = sheet.createRow(index);
- Object t = it.next(); //這裏不要使用泛型強制轉換
- // 利用反射,根據javabean屬性的先後順序,動態調用getXxx()方法得到屬性值
- Field[] fields = t.getClass().getDeclaredFields();
- for (short i = 0; i < fields.length; i++) {
- HSSFCell cell = row.createCell(i);
- cell.setCellStyle(style2);
- Field field = fields[i];
- String fieldName = field.getName();
- String getMethodName = "get"
- + fieldName.substring(0, 1).toUpperCase()
- + fieldName.substring(1);
- try {
- Class tCls = t.getClass();
- Method getMethod = tCls.getMethod(getMethodName,
- new Class[] {});
- Object value = getMethod.invoke(t, new Object[] {});
- // 判斷值的類型後進行強制類型轉換
- String textValue = "";
- if(value == null || "".equals(value)){
- value = "";
- }else if (value instanceof Integer) {
- int intValue = (Integer) value;
- cell.setCellValue(intValue);
- } else if (value instanceof Float) {
- float fValue = (Float) value;
- cell.setCellValue(fValue + "");
- } else if (value instanceof Double) {
- double dValue = (Double) value;
- cell.setCellValue(dValue + "");
- } else if (value instanceof Long) {
- long longValue = (Long) value;
- cell.setCellValue(longValue);
- }
- if (value instanceof Boolean) {
- boolean bValue = (Boolean) value;
- textValue = "男";
- if (!bValue) {
- textValue = "女";
- }
- } else if (value instanceof Date) {
- Date date = (Date) value;
- SimpleDateFormat sdf = new SimpleDateFormat(pattern);
- textValue = sdf.format(date);
- } else {
- // 其它數據類型都當作字符串簡單處理
- textValue = value.toString();
- }
- // 如果不是圖片數據,就利用正則表達式判斷textValue是否全部由數字組成
- if (textValue != null) {
- Pattern p = Pattern.compile("^//d+(//.//d+)?{1}");
- Matcher matcher = p.matcher(textValue);
- if (matcher.matches()) {
- // 是數字當作double處理
- cell.setCellValue(Double.parseDouble(textValue));
- } else {
- HSSFRichTextString richString = new HSSFRichTextString(
- textValue);
- HSSFFont font3 = workbook.createFont();
- font3.setColor(HSSFColor.BLUE.index);
- richString.applyFont(font3);
- cell.setCellValue(richString);
- }
- }
- } catch (SecurityException e) {
- e.printStackTrace();
- } catch (NoSuchMethodException e) {
- e.printStackTrace();
- } catch (IllegalArgumentException e) {
- e.printStackTrace();
- } catch (IllegalAccessException e) {
- e.printStackTrace();
- } catch (InvocationTargetException e) {
- e.printStackTrace();
- } finally {
- // 清理資源
- }
- }
- }
- try {
- workbook.write(out);
- } catch (IOException e) {
- e.printStackTrace();
- }
- }
java poi excel export 反射原理
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