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| package com.jbn;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.text.DecimalFormat;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.List;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.transform.OutputKeys;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.DateUtil;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
public class ExcelToXML {
private static final DecimalFormat DECIMAL_FORMAT = new DecimalFormat("#");
private static final SimpleDateFormat DATE_FORMAT = new SimpleDateFormat("yyyy/MM/dd");
public List<List<String>> readExcelToList(String filePath, String sheetName) throws IOException {
try (FileInputStream fileInputStream = new FileInputStream(filePath)) {
Workbook workbook = filePath.toLowerCase().endsWith("xlsx") ? new XSSFWorkbook(fileInputStream)
: new HSSFWorkbook(fileInputStream);
List<List<String>> list = new ArrayList<>();
Sheet sheet = workbook.getSheet(sheetName);
if (sheet == null) {
throw new IllegalArgumentException("Sheet not found: " + sheetName);
}
int colNum = sheet.getRow(0).getLastCellNum();
for (int i = 0; i < sheet.getLastRowNum() + 1; i++) {
Row row = sheet.getRow(i);
if (row == null) {
continue;
}
List<String> listRow = new ArrayList<>();
for (int j = 0; j < colNum; j++) {
Cell cell = row.getCell(j, Row.MissingCellPolicy.CREATE_NULL_AS_BLANK);
String cellValue = formatCellValue(cell);
if (i == 0) {
cellValue = cellValue.toLowerCase();
}
listRow.add(cellValue);
}
list.add(listRow);
}
workbook.close();
return list;
}
}
public void writeListToXML(List<List<String>> list, String filePath)
throws ParserConfigurationException, IOException {
DocumentBuilderFactory docFactory = DocumentBuilderFactory.newInstance();
DocumentBuilder docBuilder = docFactory.newDocumentBuilder();
Document doc = docBuilder.newDocument();
doc.setXmlStandalone(true);
Element rootElement = doc.createElement("records");
doc.appendChild(rootElement);
List<String> tags = list.get(0);
System.out.println(tags);
for (int i = 1; i < list.size(); i++) {
Element recordElement = doc.createElement("record");
rootElement.appendChild(recordElement);
List<String> values = list.get(i);
System.out.println(values);
for (int j = 0; j < values.size(); j++) {
Element element = doc.createElement(sanitizeTagName(tags.get(j)));
element.setTextContent(values.get(j));
recordElement.appendChild(element);
}
}
try (FileOutputStream output = new FileOutputStream(filePath)) {
writeXml(doc, output);
}
}
private static String sanitizeTagName(String tagName) {
return tagName.replaceAll("[^\\w\\d]", "_");
}
private static String formatCellValue(Cell cell) {
if (cell == null)
return "";
switch (cell.getCellType()) {
case STRING:
return cell.getStringCellValue().trim();
case BOOLEAN:
return String.valueOf(cell.getBooleanCellValue());
case NUMERIC:
if (DateUtil.isCellDateFormatted(cell)) {
return DATE_FORMAT.format(cell.getDateCellValue());
} else {
return DECIMAL_FORMAT.format(cell.getNumericCellValue());
}
case BLANK:
return "";
case ERROR:
return "Error";
default:
return "";
}
}
private static void writeXml(Document doc, OutputStream output) {
try {
TransformerFactory transformerFactory = TransformerFactory.newInstance();
Transformer transformer = transformerFactory.newTransformer();
transformer.setOutputProperty(OutputKeys.INDENT, "yes");
transformer.setOutputProperty(OutputKeys.ENCODING, "UTF-8");
transformer.setOutputProperty(OutputKeys.STANDALONE, "yes");
DOMSource source = new DOMSource(doc);
StreamResult result = new StreamResult(output);
transformer.transform(source, result);
} catch (Exception e) {
e.printStackTrace();
}
}
public static void main(String args[]) {
try {
ExcelToXML excelToXML = new ExcelToXML();
List<List<String>> list = excelToXML
.readExcelToList("D:\\study\\java\\excel-to-xml\\src\\main\\resources\\test.xlsx", "records");
excelToXML.writeListToXML(list, "D:\\study\\java\\excel-to-xml\\src\\main\\resources\\test.xml");
} catch (Exception e) {
e.printStackTrace();
}
}
}
|
