java excel上传--poi

工作中很多批量上传需求不同，每个需求都要写一次批量上传代码，太烦。。决定写一个通用工具，此代码复制即用。需要改进的地方请评论区留言

方法调用传参例子：
上传文件中列的字段对应的是对象的属性

String[] fieldsName = new String[]{"carModelName","salePrice"}; 

此参数是上传文件中列必传字段对应对象的属性

String[] fieldsIsNull = new String[]{"carModelName"}; 

注：数组属性顺序必须和文件中顺序一样，解析文件时赋值不会赋错字段

 public static final String OFFICE_EXCEL_2003_POSTFIX = "xls"; public static final String OFFICE_EXCEL_2007_POSTFIX = "xlsx"; public static final String EMPTY = ""; public static final String POINT = ".";

/
**

 * 通过反射处理以获得的数据 * @param */ public T reflectDeal(T className, Cell cell, String fieldName){ Class aClass = null; try { aClass = className.getClass(); Field[] declaredFields = aClass.getDeclaredFields(); for (Field field:declaredFields) { field.setAccessible(true); String names = fieldName.substring(0, 1).toUpperCase() + fieldName.substring(1, fieldName.length()); if(field.getName().equals(fieldName) && field.getType().getName().equals("java.math.BigDecimal")){ aClass.getMethod("set"+names,BigDecimal.class).invoke(className,new BigDecimal(""+cell)); }else if(field.getName().equals(fieldName) && field.getType().getName().equals("java.lang.String")){ aClass.getMethod("set"+names,String.class).invoke(className,cell.getStringCellValue().toString()); }else if(field.getName().equals(fieldName) && field.getType().getName().equals("java.lang.Integer")){ aClass.getMethod("set"+names,Integer.class).invoke(className,cell); }else if(field.getName().equals(fieldName) && field.getType().getName().equals("java.lang.Double")){ aClass.getMethod("set"+names,Double.class).invoke(className,cell); } } } catch (IllegalAccessException e) { e.printStackTrace(); } catch (NoSuchMethodException e) { e.printStackTrace(); } catch (InvocationTargetException e) { e.printStackTrace(); } return className; } /** * 本段代码解析xls文件 * @param */ public List<T> analysisXls(InputStream in,Class<?> clazz,String[] fieldsName,String[] fieldsIsNull) { int totalrows = 0; int totalCell = 0; List<T> list = new ArrayList(); logger.info("==================== 开始解析xls文件 ========================="); //流读取文件 //创建文件 HSSFWorkbook wb = null; try { wb = new HSSFWorkbook(in); //读取页数 for(int num = 0 ; num < wb.getNumberOfSheets() ; num ++){ Sheet xs = wb.getSheetAt(num); if(xs == null){ continue; } totalrows = xs.getLastRowNum()+1; for (int rnum = 1 ; rnum < totalrows ; rnum ++){ boolean flag = false; T o = null; try { o = (T)clazz.newInstance(); } catch (InstantiationException e) { e.printStackTrace(); } catch (IllegalAccessException e) { e.printStackTrace(); } Row row = xs.getRow(rnum); if(row != null){ totalCell = row.getLastCellNum(); int nullCellNumb = 0; for (int cnum = 0 ; cnum < totalCell ; cnum ++){ Cell cell = row.getCell(cnum); if(null == cell){ nullCellNumb++; if(nullCellNumb>=10){ break; } continue; } if( cell != null && !"".equals(cell.toString().trim())){ this.reflectDeal(o, cell, fieldsName[cnum]); }else { for (int x=0;x<fieldsIsNull.length;x++){ if(fieldsIsNull[x].equals(fieldsName[cnum])){ flag = true; break; } } } } if (flag){ continue; } list.add(o); }else { return list; } } } } catch (IOException e) { e.printStackTrace(); }finally { try { in.close(); if(null != wb){ wb.close(); } } catch (IOException e) { e.printStackTrace(); } } return list; } 

/**

 * 本段代码解析xlsx文件 * @param * @param clazz * @param fieldsName * @return */ public List<T> analysisXlsx(InputStream in,Class<?> clazz,String[] fieldsName,String[] fieldsIsNull){ int totalrows = 0; int totalCell = 0; List<T> list = new ArrayList(); logger.info("==================== 开始解析xlsx文件 ========================="); //流读取文件 //创建文件 XSSFWorkbook wb = null; try { wb = new XSSFWorkbook(OPCPackage.open(in)); //读取页数 for(int num = 0 ; num < wb.getNumberOfSheets() ; num ++){ Sheet xs = wb.getSheetAt(num); if(xs == null){ continue; } totalrows = xs.getLastRowNum()+1; for (int rnum = 1 ; rnum < totalrows ; rnum ++){ boolean flag = false; T o = (T)clazz.newInstance(); Row row = xs.getRow(rnum); if(row != null){ totalCell = row.getLastCellNum(); int nullCellNumb = 0; for (int cnum = 0 ; cnum < totalCell ; cnum ++){ Cell cell = row.getCell(cnum); if(null == cell){ nullCellNumb++; if(nullCellNumb>=10){ break; } continue; } if( cell != null && !"".equals(cell.toString().trim())){ nullCellNumb = 0; this.reflectDeal(o, cell, fieldsName[cnum]); }else { for (int x=0;x<fieldsIsNull.length;x++){ if(fieldsIsNull[x].equals(fieldsName[cnum])){ flag = true; break; } } } } if (flag){ continue; } list.add(o); }else { return list; } } } } catch (IOException e) { e.printStackTrace(); } catch (IllegalAccessException e) { e.printStackTrace(); } catch (InstantiationException e) { e.printStackTrace(); } catch (InvalidFormatException e) { logger.info("======= XSSF创建文件失败 ===="); e.printStackTrace(); }finally { try { in.close(); if(null != wb){ wb.close(); } } catch (IOException e) { e.printStackTrace(); } } return list; } 

/**

 *此段代码区分e'xcel版本，分别调用哪个方法 * @param * @param clazz * @param fieldsName * @return * @throws IOException */ public List<T> readxlsAndXlsx(InputStream in,Class<?> clazz,String[] fieldsName,String fileName,String[] fieldsIsNull) { if(null != in ){ String postfix = ExcelImport.getpostfix(fileName); if(OFFICE_EXCEL_2003_POSTFIX.equals(postfix)){ return this.analysisXls(in,clazz,fieldsName,fieldsIsNull); }else if(OFFICE_EXCEL_2007_POSTFIX.equals(postfix)){ return this.analysisXlsx(in,clazz,fieldsName,fieldsIsNull); }else { return null; } } return null; } 

/**

 * 获取文件后缀名 * @param path * @return */ public static String getpostfix(String path){ if(path == null || EMPTY.equals(path.trim())){ return ""; } if(path.contains(POINT)){ return path.substring(path.lastIndexOf(POINT)+1,path.length()); } return ""; }