如何从Excel文件中逐行读取值，并将它们放置到Map中？

我的目标是阅读一个知道格式的Excel文档，每次读一个单元格和一列。 每一行都将被设置成一个名为Item的bean，它将被放置在一个映射中，其中的键作为它的项目编号。 一旦我这样做，我可以继续其余的程序，并将其放入数据库。 我现在是一个专栏，试图找出如何做到这一点。

public class Excel { private Items items; Excel(Items items) { this.items = items; } public static void main(String[] args) { JFileChooser fileChooser = new JFileChooser(); int returnVlue = fileChooser.showOpenDialog(null); Map<Long, Items> map1 = new HashMap<Long, Items>(); String mat, thick, size, lbsPerSheet, lbs; if (returnVlue == JFileChooser.APPROVE_OPTION) { try { Workbook workbook = new HSSFWorkbook(new FileInputStream( fileChooser.getSelectedFile())); Sheet sheet = workbook.getSheetAt(0); for (Iterator<Row> rit = sheet.rowIterator(); rit.hasNext();) { Row row = rit.next(); for (Iterator<Cell> cit = row.cellIterator(); cit.hasNext();) { Cell cell = cit.next(); cell.setCellType(Cell.CELL_TYPE_STRING); mat = cell.getStringCellValue(); thick = cell.getStringCellValue(); size = cell.getStringCellValue(); lbsPerSheet = cell.getStringCellValue(); lbs = cell.getStringCellValue(); System.out.println("Mat "+mat+" Thick "+ thick+" Size "+size+" lbs Per Sheet "+lbsPerSheet+" lbs "+lbs+ "\t"); } System.out.println(); } } catch (Exception e) { // TODO: handle exception } } } } 

产量

 Mat 11960120 Thick 11960120 Size 11960120 lbs Per Sheet 11960120 lbs 11960120 Mat 0.119 Thick 0.119 Size 0.119 lbs Per Sheet 0.119 lbs 0.119 Mat 60x120 Thick 60x120 Size 60x120 lbs Per Sheet 60x120 lbs 60x120 Mat 250 Thick 250 Size 250 lbs Per Sheet 250 lbs 250 Mat 0.41 Thick 0.41 Size 0.41 lbs Per Sheet 0.41 lbs 0.41 Row org.apache.poi.hssf.usermodel.HSSFRow@2a Mat 18860120 Thick 18860120 Size 18860120 lbs Per Sheet 18860120 lbs 18860120 Mat 0.188 Thick 0.188 Size 0.188 lbs Per Sheet 0.188 lbs 0.188 Mat 60x120 Thick 60x120 Size 60x120 lbs Per Sheet 60x120 lbs 60x120 Mat 383 Thick 383 Size 383 lbs Per Sheet 383 lbs 383 Mat 0.41 Thick 0.41 Size 0.41 lbs Per Sheet 0.41 lbs 0.41 Row org.apache.poi.hssf.usermodel.HSSFRow@2a Mat 25060120 Thick 25060120 Size 25060120 lbs Per Sheet 25060120 lbs 25060120 Mat 0.25 Thick 0.25 Size 0.25 lbs Per Sheet 0.25 lbs 0.25 Mat 60x120 Thick 60x120 Size 60x120 lbs Per Sheet 60x120 lbs 60x120 Mat 510 Thick 510 Size 510 lbs Per Sheet 510 lbs 510 Mat 0.41 Thick 0.41 Size 0.41 lbs Per Sheet 0.41 lbs 0.41 Row org.apache.poi.hssf.usermodel.HSSFRow@2a Mat 25072144 Thick 25072144 Size 25072144 lbs Per Sheet 25072144 lbs 25072144 Mat 0.25 Thick 0.25 Size 0.25 lbs Per Sheet 0.25 lbs 0.25 Mat 72x144 Thick 72x144 Size 72x144 lbs Per Sheet 72x144 lbs 72x144 Mat 734.4 Thick 734.4 Size 734.4 lbs Per Sheet 734.4 lbs 734.4 Mat 0.41 Thick 0.41 Size 0.41 lbs Per Sheet 0.41 lbs 0.41 Row org.apache.poi.hssf.usermodel.HSSFRow@2a Mat 31360120 Thick 31360120 Size 31360120 lbs Per Sheet 31360120 lbs 31360120 Mat 0.313 Thick 0.313 Size 0.313 lbs Per Sheet 0.313 lbs 0.313 Mat 60x120 Thick 60x120 Size 60x120 lbs Per Sheet 60x120 lbs 60x120 Mat 633.2616 Thick 633.2616 Size 633.2616 lbs Per Sheet 633.2616 lbs 633.2616 Mat 0.41 Thick 0.41 Size 0.41 lbs Per Sheet 0.41 lbs 0.41 Row org.apache.poi.hssf.usermodel.HSSFRow@2a Mat 37560120 Thick 37560120 Size 37560120 lbs Per Sheet 37560120 lbs 37560120 Mat 0.375 Thick 0.375 Size 0.375 lbs Per Sheet 0.375 lbs 0.375 Mat 60x120 Thick 60x120 Size 60x120 lbs Per Sheet 60x120 lbs 60x120 Mat 758.7 Thick 758.7 Size 758.7 lbs Per Sheet 758.7 lbs 758.7 Mat 0.41 Thick 0.41 Size 0.41 lbs Per Sheet 0.41 lbs 0.41 Row org.apache.poi.hssf.usermodel.HSSFRow@2a Mat 50060120 Thick 50060120 Size 50060120 lbs Per Sheet 50060120 lbs 50060120 Mat 0.5 Thick 0.5 Size 0.5 lbs Per Sheet 0.5 lbs 0.5 Mat 60x120 Thick 60x120 Size 60x120 lbs Per Sheet 60x120 lbs 60x120 Mat 1011.6 Thick 1011.6 Size 1011.6 lbs Per Sheet 1011.6 lbs 1011.6 Mat 0.41 Thick 0.41 Size 0.41 lbs Per Sheet 0.41 lbs 0.41 Row org.apache.poi.hssf.usermodel.HSSFRow@2a Mat 75060120 Thick 75060120 Size 75060120 lbs Per Sheet 75060120 lbs 75060120 Mat 0.75 Thick 0.75 Size 0.75 lbs Per Sheet 0.75 lbs 0.75 Mat 60x120 Thick 60x120 Size 60x120 lbs Per Sheet 60x120 lbs 60x120 Mat 1517.4 Thick 1517.4 Size 1517.4 lbs Per Sheet 1517.4 lbs 1517.4 Mat 0.41 Thick 0.41 Size 0.41 lbs Per Sheet 0.41 lbs 0.41 Row org.apache.poi.hssf.usermodel.HSSFRow@2a Mat 10060120 Thick 10060120 Size 10060120 lbs Per Sheet 10060120 lbs 10060120 Mat 1 Thick 1 Size 1 lbs Per Sheet 1 lbs 1 Mat 60x120 Thick 60x120 Size 60x120 lbs Per Sheet 60x120 lbs 60x120 Mat 2023.2 Thick 2023.2 Size 2023.2 lbs Per Sheet 2023.2 lbs 2023.2 Mat 0.41 Thick 0.41 Size 0.41 lbs Per Sheet 0.41 lbs 0.41 

Excel文件

 11960120 0.119 60x120 250.00 $0.4100 18860120 0.188 60x120 383.00 $0.4100 25060120 0.250 60x120 510.00 $0.4100 25072144 0.250 72x144 734.40 $0.4100 31360120 0.313 60x120 633.26 $0.4100 37560120 0.375 60x120 758.70 $0.4100 50060120 0.500 60x120 1011.60 $0.4100 75060120 0.750 60x120 1517.40 $0.4100 10060120 1.000 60x120 2023.20 $0.4100 

我想读取上面的excel文件很像一个二维数组。 例如：

 array[0][0] = 11960120; array[0][1] = 0.119; array[0][2]= "60x120"; 

如果我可以像上面那样读取行和列，使用Items类中的getter和setter，那么只需将“Item”放入一个映射中，并用项目编号包装，例如11960120位于单元格[0] [0]在上面的excel例子中。

要更清楚我想阅读这样的Excel文件

 11960120 0.119 60x120 250.00 $0.4100 

然后阅读下一行

 18860120 0.188 60x120 383.00 $0.4100 

每个单元格将被设置为Items类。

Answer 1

您可以使用Apache Metamodel库来查询Excel电子表格。 我在下面显示的方法保留了列名，所以你可以编写一个方法来获取列名和行号的值。 如果你不想/有列名，这个代码将不得不调整：

 private static org.slf4j.Logger logger = LoggerFactory.getLogger( "Data" ); public static Object[][] getExcelData( File excelFile, String sheetName ) { ExcelConfiguration conf = new ExcelConfiguration( 1, true, false ); DataContext dataContext = DataContextFactory.createExcelDataContext( excelFile, conf ); DataSet dataSet = dataContext.query() .from( sheetName ) .selectAll() .where("run").eq("Y") .execute(); List<Row> rows = dataSet.toRows(); Object[][] myArray = get2ArgArrayFromRows( rows ); return myArray; } /** * Gets a 2D Object array from a List of Row objects that is only 2 args wide. * @param rows * @return */ public static Object[][] get2ArgArrayFromRows( List<Row> rows ) { Object[][] myArray = new Object[rows.size()][2]; int i = 0; SelectItem[] cols = rows.get(0).getSelectItems(); for ( Row r : rows ) { Object[] data = r.getValues(); for ( int j = 0; j < cols.length; j++ ) { if ( data[j] == null ) data[j] = ""; // force empty string where there are NULL values } myArray[i][0] = cols; myArray[i][2] = data; i++; } logger.info( "Row count: " + rows.size() ); logger.info( "Column names: " + Arrays.toString( cols ) ); return myArray; } 

然后，如果你想使用，可以使用Google Guava将二维数组转换为列表。 （我认为转换为地图会有问题，如果有愚弄？）：

 Double[][] array; List<List<Double>> list = Lists.transform(Arrays.asList(array), new Function<Double[], List<Double>>() { @Override public List<Double> apply(Double[] row) { return Arrays.asList(row); } } } 

Answer 2

你目前的循环：

  for (Iterator<Row> rit = sheet.rowIterator(); rit.hasNext();) { Row row = rit.next(); for (Iterator<Cell> cit = row.cellIterator(); cit.hasNext();) { Cell cell = cit.next(); cell.setCellType(Cell.CELL_TYPE_STRING); mat = cell.getStringCellValue(); thick = cell.getStringCellValue(); size = cell.getStringCellValue(); lbsPerSheet = cell.getStringCellValue(); lbs = cell.getStringCellValue(); System.out.println("Mat "+mat+" Thick "+ thick+" Size "+size+" lbs Per Sheet "+lbsPerSheet+" lbs "+lbs+ "\t"); } System.out.println(); } 

……基本上是这样说的：“对于表格中的每一行和每一个单元格，把这个特定单元格的值放到这五个不同的variables中”。 cell是当前单元格，并且获取其string值并将其放入所有variables中实际上并不合理。 你可能想要第一个单元去mat ，第二个去thick ，等等。 你可以做这两件事情之一：

1. 分配给没有循环的值：

     for (Iterator<Row> rit = sheet.rowIterator(); rit.hasNext();) { Row row = rit.next(); Iterator<Cell> cit = row.cellIterator() Cell cell; if ( cit.hasNext() ) { cell = cit.next(); cell.setCellType(Cell.CELL_TYPE_STRING); mat = cell.getStringCellValue(); } if ( cit.hasNext() ) { cell = cit.next(); cell.setCellType(Cell.CELL_TYPE_STRING); thick = cell.getStringCellValue(); } if ( cit.hasNext() ) { cell = cit.next(); cell.setCellType(Cell.CELL_TYPE_STRING); size = cell.getStringCellValue(); } if ( cit.hasNext() ) { cell = cit.next(); cell.setCellType(Cell.CELL_TYPE_STRING); lbsPerSheet = cell.getStringCellValue(); } if ( cit.hasNext() ) { cell = cit.next(); cell.setCellType(Cell.CELL_TYPE_STRING); lbs = cell.getStringCellValue(); } System.out.println("Mat "+mat+" Thick "+ thick+" Size "+size+" lbs Per Sheet "+lbsPerSheet+" lbs "+lbs+ "\n"); } 

2. 使用数组和循环：

     for (Iterator<Row> rit = sheet.rowIterator(); rit.hasNext();) { Row row = rit.next(); String[] cells = new String[row.getPhysicalNumberOfCells()]; int i = 0; for (Iterator<Cell> cit = row.cellIterator(); cit.hasNext();) { Cell cell = cit.next(); cell.setCellType(Cell.CELL_TYPE_STRING); cells[i++] = cell.getStringCellValue(); } // At this point you can put the values of the cells in // your map entry. System.out.println(Arrays.toString(cells); }