如何在 Java 上的 JTable 中填充一些 Excel 行? [英] How to fill some rows of Excel in a JTable on Java?
问题描述
我正在将数据从 Excel 文件导入 Java JTable
.我可以导入所有工作表,但我只想导入 一些 行.这是我用来导入工作表的代码:
I'm working on importing data from an Excel file into a Java JTable
. I can import all the sheet, but I want to import only some rows. This is the code I'm using to import the sheet:
private void remplirtable(JTable table, int numfeuil,String s) {
Workbook wb;
File fichier = new File(s);
try {
//création de la table et importation du fichier
wb = Workbook.getWorkbook(fichier);
Sheet sheet = wb.getSheet(numfeuil);
String[] columnsnames=new String[sheet.getColumns()];
DefaultTableModel model = new DefaultTableModel();
//Remplir la table désignée
table.setModel(model);
int colonnes = sheet.getColumns();
int lignes = sheet.getRows();
Object data[] = new Object[colonnes];
for (int i=0; i<lignes; i++){
for (int j=0; j<colonnes; j++){
if (i==0)
{
//Component c=super.prepareRenderer(renderer, j, i);
model.addColumn(sheet.getCell(j,i).getContents());
}
//System.out.println(sheet.getCell(j,i).getContents());
if(i>=1)
data[j]=sheet.getCell(j,i).getContents();
}model.addRow(data);
}model.removeRow(0);
} catch (BiffException | IOException e) {
}
}
为了仅导入行 (3,4,5),我使用了此代码.A
是我们存放行数的数组:
In order to import only the rows (3,4,5), I used this code. A
is the array in which we stock the rows numbers:
private void RemplirPostes(JTable table, int numfeuil,String s,int[] A) {
Workbook wb;
File fichier = new File(s);
try {
//création de la table et importation du fichier
wb = Workbook.getWorkbook(fichier);
Sheet sheet = wb.getSheet(numfeuil);
DefaultTableModel model = new DefaultTableModel();
//Remplir la table désignée
table.setModel(model);
int colonnes = sheet.getColumns();
Object data[] = new Object[colonnes];
for(int k=0;k<A.length;k++)
{
for (int j=0; j<colonnes; j++){
if (A[k]==0)
{
//Component c=super.prepareRenderer(renderer, j, i);
model.addColumn(sheet.getCell(j,A[k]).getContents());
}
//System.out.println(sheet.getCell(j,i).getContents());
if(A[k]>=1)
data[j]=sheet.getCell(j,A[k]).getContents();
}model.addRow(data);
}
model.removeRow(0);
} catch (BiffException | IOException e) {
}
}
而这一切都行不通.
推荐答案
从这个完整的例子开始,如下代码创建一个表,该表具有从 MIN_ROW
到 MAX_ROW
(含)的指定数量的 COLUMNS
.
Starting from this complete example, the following code creates a table having the indicated number of COLUMNS
from MIN_ROW
to MAX_ROW
, inclusive.
private static final int COLUMNS = 4;
private static final int MIN_ROW = 3;
private static final int MAX_ROW = 5;
…
DataFormatter format = new DataFormatter();
DefaultTableModel model = new DefaultTableModel(0, COLUMNS);
for (Row row : sheet) {
if (row.getRowNum() >= MIN_ROW && row.getRowNum() <= MAX_ROW) {
Vector rowData = new Vector();
for (Cell cell : row) {
rowData.add(format.formatCellValue(cell));
}
model.addRow(rowData);
}
}
…
JFrame f = new JFrame("TableTest");
f.add(new JTable(model));
附录:仔细观察您当前的方法,您可能希望容纳不连续的行.用 List
替换数组可能会有所帮助.然后你可以使用 contains()
代替上面的谓词:
Addendum: Looking closer at your current approach, you may want to accommodate non-contiguous rows. It may help to replace your array with a List<Integer>
. You can then use contains()
in place of the predicate above:
if (a.contains(row.getRowNum()) {…}
附录:要计算公式,您可以将 FormulaEvaluator
传递给 formatCellValue()
.
Addendum: To evaluate formulae, you can pass a FormulaEvaluator
to formatCellValue()
.
FormulaEvaluator eval = book.getCreationHelper().createFormulaEvaluator();
…
rowData.add(format.formatCellValue(cell, eval));
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