Java SSM註解實現POI匯入匯出Excel
阿新 • • 發佈：2019-01-09
POI生成Excel設定單元格格式：
HSSFWorkbook demoWorkBook = new HSSFWorkbook(); HSSFSheet demoSheet = demoWorkBook.createSheet("The World's 500 Enterprises"); HSSFCell cell = demoSheet.createRow(0).createCell(0); 設定單元格為文字格式 HSSFCellStyle cellStyle2 = demoWorkBook.createCellStyle(); HSSFDataFormat format = demoWorkBook.createDataFormat(); cellStyle2.setDataFormat(format.getFormat("@")); cell.setCellStyle(cellStyle2); 第一種：日期格式 cell.setCellValue(new Date(2008,5,5)); //set date format HSSFCellStyle cellStyle = demoWorkBook.createCellStyle(); HSSFDataFormat format= demoWorkBook.createDataFormat(); cellStyle.setDataFormat(format.getFormat("yyyy年m月d日")); cell.setCellStyle(cellStyle); 第二種：保留兩位小數格式 cell.setCellValue(1.2); HSSFCellStyle cellStyle = demoWorkBook.createCellStyle(); cellStyle.setDataFormat(HSSFDataFormat.getBuiltinFormat("0.00")); cell.setCellStyle(cellStyle); 第三種：貨幣格式 cell.setCellValue(20000); HSSFCellStyle cellStyle = demoWorkBook.createCellStyle(); HSSFDataFormat format= demoWorkBook.createDataFormat(); cellStyle.setDataFormat(format.getFormat("¥#,##0")); cell.setCellStyle(cellStyle); 第四種：百分比格式 cell.setCellValue(20); HSSFCellStyle cellStyle = demoWorkBook.createCellStyle(); cellStyle.setDataFormat(HSSFDataFormat.getBuiltinFormat("0.00%")); cell.setCellStyle(cellStyle); 第五種：中文大寫格式 cell.setCellValue(20000); HSSFCellStyle cellStyle = demoWorkBook.createCellStyle(); HSSFDataFormat format= demoWorkBook.createDataFormat(); cellStyle.setDataFormat(format.getFormat("[DbNum2][$-804]0")); cell.setCellStyle(cellStyle); 第六種：科學計數法格式 cell.setCellValue(20000); HSSFCellStyle cellStyle = demoWorkBook.createCellStyle(); cellStyle.setDataFormat( HSSFDataFormat.getBuiltinFormat("0.00E+00")); cell.setCellStyle(cellStyle);
POI註解匯入匯出工具類：
/** * 匯出匯入excel相關工具 */ public class ExcelUtil<T> { /** * datas為匯出的資料 * fileName為excel檔名稱 * sheetName為sheet名稱 * 實體類註解通用匯出方法 * * @param datas * @param fileName * @param sheetName */ public static <T> void exportExcel(List<T> datas, String fileName, String sheetName, HttpServletResponse response, boolean displayAll) throws IOException, IllegalAccessException { // String fileExcelName = new SimpleDateFormat("yyyyMMddhh").format(new Date()).toString() + fileName; HSSFWorkbook workbook = new HSSFWorkbook(); HSSFSheet sheet = workbook.createSheet(sheetName); HSSFRow row = sheet.createRow(0);//建立第一行 HSSFCellStyle cellStyle = workbook.createCellStyle(); HSSFDataFormat format = workbook.createDataFormat(); cellStyle.setDataFormat(format.getFormat("@")); Boolean isHasTitle = false; for (int i = 0; i < datas.size(); i++) { HSSFRow rowBatch = sheet.createRow(i + 1); Object o = datas.get(i); // Class c = o.getClass(); if (!isHasTitle) { for (Field field : o.getClass().getDeclaredFields()) { field.setAccessible(true); if (field.isAnnotationPresent(ExcelDesc.class)) { //獲取欄位名 //String fieldNames = o.getClass().getSimpleName() + "." + field.getName(); //獲取欄位註解 ExcelDesc columnConfig = field.getAnnotation(ExcelDesc.class); if (displayAll) { //判斷是否已經獲取過該code的字典資料 避免重複獲取 HSSFCell cell = row.createCell(Integer.valueOf(columnConfig.orderBy().toString())); cell.setCellStyle(cellStyle); cell.setCellValue(columnConfig.value().toString()); } if (!displayAll && columnConfig.display()) { HSSFCell cell = row.createCell(Integer.valueOf(columnConfig.orderBy().toString()) - 1); cell.setCellStyle(cellStyle); cell.setCellValue(columnConfig.value().toString()); } } } isHasTitle = true; } for (Field field : o.getClass().getDeclaredFields()) { field.setAccessible(true); if (field.isAnnotationPresent(ExcelDesc.class)) { //獲取欄位名 // String fieldNames = o.getClass().getSimpleName() + "." + field.getName(); //獲取欄位註解 ExcelDesc columnConfig = field.getAnnotation(ExcelDesc.class); if (displayAll) { HSSFCell cell = rowBatch.createCell(Integer.valueOf(columnConfig.orderBy().toString())); cell.setCellStyle(cellStyle); //判斷是否已經獲取過該code的字典資料 避免重複獲取 cell.setCellValue(field.get(o) == null ? "" : field.get(o).toString()); cell.setCellType(Cell.CELL_TYPE_STRING); } if (!displayAll && columnConfig.display()) { HSSFCell cell = rowBatch.createCell(Integer.valueOf(columnConfig.orderBy().toString()) - 1); cell.setCellStyle(cellStyle); cell.setCellValue(field.get(o) == null ? "" : field.get(o).toString()); cell.setCellType(Cell.CELL_TYPE_STRING); } } } } // 彈出儲存框方式 ByteArrayOutputStream os = new ByteArrayOutputStream(); try { workbook.write(os); } catch (IOException e) { e.printStackTrace(); } byte[] content = os.toByteArray(); InputStream is = new ByteArrayInputStream(content); // 設定response引數，可以開啟下載頁面 response.reset(); response.setContentType("application/vnd.ms-excel;charset=utf-8"); response.setHeader("Content-Disposition", "attachment;filename=" + new String(fileName.getBytes("gb2312"), "ISO8859-1") + ".xls"); ServletOutputStream out = response.getOutputStream(); BufferedInputStream bis = null; BufferedOutputStream bos = null; try { bis = new BufferedInputStream(is); bos = new BufferedOutputStream(out); byte[] buff = new byte[2048]; int bytesRead; // Simple read/write loop. while (-1 != (bytesRead = bis.read(buff, 0, buff.length))) { bos.write(buff, 0, bytesRead); } } catch (Exception e) { // TODO: handle exception e.printStackTrace(); } finally { if (bis != null) bis.close(); if (bos != null) bos.close(); } // sheet.autoSizeColumn(i); // sheet.SetColumnWidth(i, 100 * 256); } Class<T> clazz; public ExcelUtil(Class<T> clazz) { this.clazz = clazz; } public List<T> importExcel(String fileName, String sheetName, InputStream input) { int maxCol = 0; List<T> list = new ArrayList<T>(); try { Workbook workbook = null; String fileType = fileName.substring(fileName.lastIndexOf("."), fileName.length()); if (".xls".equals(fileType.trim().toLowerCase())) { workbook = new HSSFWorkbook(input);// 建立 Excel 2003 工作簿物件 } else if (".xlsx".equals(fileType.trim().toLowerCase())) { workbook = new XSSFWorkbook(input);//建立 Excel 2007 工作簿物件 }//解決Excel匯入的相容2003和2007版本的問題 Sheet sheet = workbook.getSheet(sheetName); if (!sheetName.trim().equals("")) { sheet = workbook.getSheet(sheetName);// 如果指定sheet名,則取指定sheet中的內容. } if (sheet == null) { sheet = workbook.getSheetAt(0); // 如果傳入的sheet名不存在則預設指向第1個sheet. } int rows = sheet.getPhysicalNumberOfRows(); if (rows > 0) {// 有資料時才處理 // Field[] allFields = clazz.getDeclaredFields();// 得到類的所有field. List<Field> allFields = getMappedFiled(clazz, null); Map<Integer, Field> fieldsMap = new HashMap<Integer, Field>();// 定義一個map用於存放列的序號和field. for (Field field : allFields) { // 將有註解的field存放到map中. if (field.isAnnotationPresent(ExcelDesc.class)) { ExcelDesc attr = field.getAnnotation(ExcelDesc.class); int col = Integer.valueOf(attr.orderBy().toString()); maxCol = Math.max(col, maxCol); System.out.println(col + "====" + field.getName()); field.setAccessible(true);// 設定類的私有欄位屬性可訪問. fieldsMap.put(col, field); } } for (int i = 1; i < rows; i++) {// 從第2行開始取資料,預設第一行是表頭. Row row = sheet.getRow(i); // int cellNum = row.getPhysicalNumberOfCells(); // int cellNum = row.getLastCellNum(); int cellNum = maxCol; T entity = null; for (int j = 0; j < cellNum; j++) { Cell cell = row.getCell(j); if (cell == null) { continue; } int cellType = cell.getCellType(); String c = ""; if (cellType == HSSFCell.CELL_TYPE_NUMERIC) { c = String.valueOf(cell.getNumericCellValue()); } else if (cellType == HSSFCell.CELL_TYPE_BOOLEAN) { c = String.valueOf(cell.getBooleanCellValue()); } else { c = cell.getStringCellValue(); } if (c == null || c.equals("")) { continue; } entity = (entity == null ? clazz.newInstance() : entity);// 如果不存在例項則新建. // System.out.println(cells[j].getContents()); Field field = fieldsMap.get(j + 1);// 從map中得到對應列的field. if (field == null) { continue; } // 取得型別,並根據物件型別設定值. Class<?> fieldType = field.getType(); if (String.class == fieldType) { field.set(entity, String.valueOf(c)); } else if ((Integer.TYPE == fieldType) || (Integer.class == fieldType)) { field.set(entity, Integer.parseInt(c)); } else if ((Long.TYPE == fieldType) || (Long.class == fieldType)) { field.set(entity, Long.valueOf(c)); } else if ((Float.TYPE == fieldType) || (Float.class == fieldType)) { field.set(entity, Float.valueOf(c)); } else if ((Short.TYPE == fieldType) || (Short.class == fieldType)) { field.set(entity, Short.valueOf(c)); } else if ((Double.TYPE == fieldType) || (Double.class == fieldType)) { field.set(entity, Double.valueOf(c)); } else if (Character.TYPE == fieldType) { if ((c != null) && (c.length() > 0)) { field.set(entity, Character.valueOf(c.charAt(0))); } } } if (entity != null) { list.add(entity); } } } } catch (IOException e) { e.printStackTrace(); } catch (InstantiationException e) { e.printStackTrace(); } catch (IllegalAccessException e) { e.printStackTrace(); } catch (IllegalArgumentException e) { e.printStackTrace(); } return list; } /** * 得到實體類所有通過註解映射了資料表的欄位 * * @return */ @SuppressWarnings("rawtypes") private List<Field> getMappedFiled(Class clazz, List<Field> fields) { if (fields == null) { fields = new ArrayList<Field>(); } Field[] allFields = clazz.getDeclaredFields();// 得到所有定義欄位 // 得到所有field並存放到一個list中. for (Field field : allFields) { if (field.isAnnotationPresent(ExcelDesc.class)) { fields.add(field); } } if (clazz.getSuperclass() != null && !clazz.getSuperclass().equals(Object.class)) { getMappedFiled(clazz.getSuperclass(), fields); } return fields; } }
註解類：
@Target(ElementType.FIELD)
@Retention(RetentionPolicy.RUNTIME)
@Documented
@Inherited
public @interface ExcelDesc {
String value();
String orderBy();
boolean display() default true;
}
實體類：
public class ProductExcel { @ExcelDesc(value = "商品編碼" , orderBy = "1") public String SKU; @ExcelDesc(value = "商品名稱" , orderBy = "2") public String productName; @ExcelDesc(value = "價格" , orderBy = "3") public String productPrice; }
maven,pom.xml:
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi-ooxml</artifactId>
<version>3.14</version>
</dependency>
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi-ooxml-schemas</artifactId>
<version>3.14</version>
</dependency>
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi</artifactId>
<version>3.14</version>
</dependency>SSM,controller層：
@Controller
@RequestMapping("product")
public class ProductController{
/**
* 匯出商品價格報表
* @param response
*/
@RequestMapping(value = "export_excel/product_list",method = RequestMethod.GET)
public void excelProductList(HttpServletResponse response) {
try {
List<ProductExcel> productExcels = productService.getProductExcel();
ExcelUtil.exportExcel(productExcels, "商品價格統計", "商品價格列表", response, false);
} catch (Exception e) {
e.printStackTrace();
}
}
/**
* 匯入商品價格報表
*/
@RequestMapping(value = "import_excel/product_list",method = RequestMethod.POST)
@ResponseBody
public String importProductExcel(@RequestParam(value = "excel") MultipartFile excel) {
try {
ExcelUtil<ProductExcel> util = new ExcelUtil<ProductExcel>(ProductExcel.class);// 建立excel工具類
List<ProductExcel> list = util.importExcel(excel.getOriginalFilename(),"商品價格列表", excel.getInputStream());// 匯出
if(list.size() > 0){
if(productService.batchUpdateImportProduct(list,user) > 0){
return "success";
}
}
} catch (Exception e) {
e.printStackTrace();
}
return "error";
}
}