[java] Read XLSX file in Java

Try this:

1. Unzip XLSX file
2. Read XML files
3. Compose and use data

Example code:

    public Workbook getTemplateData(String xlsxFile) {
    Workbook workbook = new Workbook();
    parseSharedStrings(xlsxFile);
    parseWorkesheet(xlsxFile, workbook);
    parseComments(xlsxFile, workbook);
    for (Worksheet worksheet : workbook.sheets) {
        worksheet.dimension = manager.getDimension(worksheet);
    }

    return workbook;
}

private void parseComments(String tmpFile, Workbook workbook) {
    try {
        FileInputStream fin = new FileInputStream(tmpFile);
        final ZipInputStream zin = new ZipInputStream(fin);
        InputStream in = getInputStream(zin);
        while (true) {
            ZipEntry entry = zin.getNextEntry();
            if (entry == null)
                break;

            String name = entry.getName();
            if (name.endsWith(".xml")) { //$NON-NLS-1$
                if (name.contains(COMMENTS)) {
                    parseComments(in, workbook);
                }
            }
            zin.closeEntry();
        }
        in.close();
        zin.close();
        fin.close();
    } catch (FileNotFoundException e) {
        System.out.println(e);
    } catch (IOException e) {
        e.printStackTrace();
    }
}

private void parseComments(InputStream in, Workbook workbook) {
    try {
        DefaultHandler handler = getCommentHandler(workbook);
        SAXParser saxParser = getSAXParser();
        saxParser.parse(in, handler);
    } catch (Exception e) {
        e.printStackTrace();
    }
}

private DefaultHandler getCommentHandler(Workbook workbook) {
    final Worksheet ws = workbook.sheets.get(0);
    return new DefaultHandler() {
        String lastTag = "";
        private Cell ccell;

        @Override
        public void startElement(String uri, String localName,
                String qName, Attributes attributes) throws SAXException {
            lastTag = qName;
            if (lastTag.equals("comment")) {
                String cellName = attributes.getValue("ref");
                int r = manager.getRowIndex(cellName);
                int c = manager.getColumnIndex(cellName);
                Row row = ws.rows.get(r);
                if (row == null) {
                    row = new Row();
                    row.index = r;
                    ws.rows.put(r, row);
                }
                ccell = row.cells.get(c);
                if (ccell == null) {
                    ccell = new Cell();
                    ccell.cellName = cellName;
                    row.cells.put(c, ccell);
                }
            }
        }

        @Override
        public void characters(char[] ch, int start, int length)
                throws SAXException {
            String val = "";
            if (ccell != null && lastTag.equals("t")) {
                for (int i = start; i < start + length; i++) {
                    val += ch[i];
                }
                if (ccell.comment == null)
                    ccell.comment = val;
                else {
                    ccell.comment += val;
                }
            }
        }
    };
}

private void parseSharedStrings(String tmpFile) {
    try {
        FileInputStream fin = new FileInputStream(tmpFile);
        final ZipInputStream zin = new ZipInputStream(fin);
        InputStream in = getInputStream(zin);
        while (true) {
            ZipEntry entry = zin.getNextEntry();
            if (entry == null)
                break;
            String name = entry.getName();
            if (name.endsWith(".xml")) { //$NON-NLS-1$
                if (name.startsWith(SHARED_STRINGS)) {
                    parseStrings(in);
                }
            }
            zin.closeEntry();
        }
        in.close();
        zin.close();
        fin.close();
    } catch (FileNotFoundException e) {
        System.out.println(e);
    } catch (IOException e) {
        e.printStackTrace();
    }
}

public void parseWorkesheet(String tmpFile, Workbook workbook) {
    try {
        FileInputStream fin = new FileInputStream(tmpFile);
        final ZipInputStream zin = new ZipInputStream(fin);
        InputStream in = getInputStream(zin);
        while (true) {
            ZipEntry entry = zin.getNextEntry();
            if (entry == null)
                break;

            String name = entry.getName();
            if (name.endsWith(".xml")) { //$NON-NLS-1$
                if (name.contains("worksheets")) {
                    Worksheet worksheet = new Worksheet();
                    worksheet.name = name;
                    parseWorksheet(in, worksheet);
                    workbook.sheets.add(worksheet);
                }
            }
            zin.closeEntry();
        }
        in.close();
        zin.close();
        fin.close();
    } catch (FileNotFoundException e) {
        System.out.println(e);
    } catch (IOException e) {
        e.printStackTrace();
    }
}

public void parseWorksheet(InputStream in, Worksheet worksheet)
        throws IOException {
    // read sheet1 sharedStrings
    // styles, strings, formulas ...
    try {
        DefaultHandler handler = getDefaultHandler(worksheet);
        SAXParser saxParser = getSAXParser();
        saxParser.parse(in, handler);
    } catch (SAXException e) {
        e.printStackTrace();
    } catch (ParserConfigurationException e) {
        e.printStackTrace();
    }
}

where Workbook class:

public class Workbook {
Integer id = null;
public List<Worksheet> sheets = new ArrayList<Worksheet>();}

and Worksheet class:

public class Worksheet {
public Integer id = null;
public String name = null;
public String dimension = null;
public Map<Integer, Row> rows = new TreeMap<Integer, Row>();
public Map<Integer, Column> columns = new TreeMap<Integer, Column>();
public List<Span> spans = new ArrayList<Span>();}

and Row class:

public class Row {
public Integer id = null;
public Integer index = null;
public Row tmpRow = null;
public Style style = null;
public Double height = null;
public Map<Integer,Cell> cells = new TreeMap<Integer, Cell>();
public String spans = null;
public Integer customHeight = null;}

and Cell class:

public class Cell {
public Integer id = null;
public Integer rowIndex = null;
public Integer colIndex = null;
public String cellName = null;
public String text = null;
public String formula = null;
public String comment = null;
public Style style = null;
public Object value = null;
public Cell tmpCell = null;}

and Column class:

public class Column {
    public Integer index = null;
    public Style style = null;
    public String width = null;
    public Column tmpColumn = null;
}

and Span class:

public class Span {
    Integer id = null;
    String topLeft = null;
    String bottomRight = null;
}