Many batch upload requirements are different in work. Each requirement needs to write a batch upload code, which is too annoying.. Decided to write a general tool, this code copy is ready to use. Please leave a message in the comment area if you need to improve
Method call parameter example:
The fields in the upload file correspond to the properties of the object
String[] fieldsName = new String[]{"carModelName","salePrice"};
This parameter is the property of the object corresponding to the column required field in the upload file
String[] fieldsIsNull = new String[]{"carModelName"};
Note: the order of array properties must be the same as that in the file. When parsing the file, the assignment will not assign wrong fields
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 = ".";
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**
* Data obtained by reflection processing * @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; } /** * This code parses xls file * @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("==================== Start parsing xls file ========================="); //Stream read file //create a file HSSFWorkbook wb = null; try { wb = new HSSFWorkbook(in); //Number of pages read 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; }
/**
* Code analysis xlsx file * @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("==================== Start parsing xlsx file ========================="); //Stream read file //create a file XSSFWorkbook wb = null; try { wb = new XSSFWorkbook(OPCPackage.open(in)); //Number of pages read 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 Failed to create file ===="); e.printStackTrace(); }finally { try { in.close(); if(null != wb){ wb.close(); } } catch (IOException e) { e.printStackTrace(); } } return list; }
/**
*This code distinguishes e'xcel Version, which method to call respectively * @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; }
/**
* Get file suffix * @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 ""; }