我需要将数据导出到excel。
我已经编写了一种传递查询结果的方法,即集合对象和String数组-attrs,其类型为LinkedHashMap<Integer, Object[]>
。该方法如下所示。每个条目的结果存储在Object数组中,并插入到键中。现在返回的结果在resultSet
中,并通过另一个方法processReport(resultSet)
。
LinkedHashMap<Integer, Object[]> resultSet = dqlHelper.insertAttrValues(collection,
attrs);
processReport(resultSet);
public LinkedHashMap<Integer, Object[]> insertAttrValues(IDfCollection collection,
String[] properties) throws DfException {
if (collection == null || properties == null) {
throw new MissingParameterException("collection and properties");
}
LinkedHashMap<Integer, Object[]> map = new LinkedHashMap<>();
Object[] values = new Object[properties.length];
int i = 0;
while (collection.next()) {
for (int x = 0; x < properties.length; x++) {
values[x] = collection.getString(properties[x]);
}
map.put(i++, values);
}
return map;
}
方法processReport(resultSet);
此方法采用resultSet
并将数据写入excel。但是在每一行中,我得到的数据与方法中的注释所示的数据相同。但是resultSet的结果具有所有数据。不知道在哪里,我做错了。非常感谢您的帮助。
private void processReport(LinkedHashMap<Integer, Object[]> resultSet)
throws IOException {
// Create a Workbook - for xlsx
Workbook workbook = new XSSFWorkbook();
/* CreationHelper helps us create instances of various things like DataFormat,
Hyperlink, RichTextString etc, in a format (HSSF, XSSF) independent way
*/
workbook.getCreationHelper();
// Create a Sheet
Sheet sheet = workbook.createSheet("Report");
// Create a Font for styling header cells
Font headerFont = workbook.createFont();
headerFont.setBold(false);
headerFont.setFontHeightInPoints((short) 12);
headerFont.setColor(IndexedColors.GREEN.getIndex());
// Create a CellStyle with the font
CellStyle headerCellStyle = workbook.createCellStyle();
headerCellStyle.setFont(headerFont);
// Create a Row
Row headerRow = sheet.createRow(0);
// Create cells
for (int i = 0; i < attrs.length; i++) {
Cell cell = headerRow.createCell(i);
cell.setCellValue(redigo_attrs[i]);
cell.setCellStyle(headerCellStyle);
}
// Facing problem in the following code.....
// same entry in every row in excel sheet
// 0902b69881bd01a5 NLP_031124 VPS17_BR-NPI-EN-GILENYA_-06.06.19_MS_(clean) Brazil Gilenya
// 0902b69881bd01a5 NLP_031124 VPS17_BR-NPI-EN-GILENYA_-06.06.19_MS_(clean) Brazil Gilenya
Set<Integer> key_set = resultSet.keySet();
sheet = workbook.getSheetAt(0);
for (Integer key: key_set) {
int last_row = sheet.getLastRowNum();
row = sheet.createRow(++last_row);
int cellNum = 0;
Object[] valuesObject = resultSet.get(key);
for (Object value: valuesObject) {
row.createCell(cellNum++).setCellValue(value.toString());
}
}
// Resize all columns to fit the content size
for (int i = 0; i < attrs.length; i++) {
sheet.autoSizeColumn(i);
}
// Write the output to the file
FileOutputStream fileOutputStream = new FileOutputStream(XLSX_FILE_PATH);
workbook.write(fileOutputStream);
// close the file
fileOutputStream.close();
// close the workbook
workbook.close();
}
您正在将引用放在同一数组(values
)上。结果,所有LinkedHashMap
值都是对包含结果集中最后一行的同一数组的引用。