import java.util.LinkedHashMap;
import java.util.Map;
+import javax.xml.parsers.ParserConfigurationException;
+
import org.apache.poi.openxml4j.opc.PackageAccess;
+import org.apache.poi.util.SAXHelper;
import org.apache.poi.xssf.eventusermodel.XLSX2CSV;
import org.apache.poi.xssf.eventusermodel.XSSFReader;
import org.apache.poi.xssf.model.SharedStringsTable;
import org.xml.sax.SAXException;
import org.xml.sax.XMLReader;
import org.xml.sax.helpers.DefaultHandler;
-import org.xml.sax.helpers.XMLReaderFactory;
/**
* XSSF and SAX (Event API) basic example.
* XSLX processing with the XSSF Event code.
*/
public class FromHowTo {
- public void processFirstSheet(String filename) throws Exception {
- try (OPCPackage pkg = OPCPackage.open(filename, PackageAccess.READ)) {
- XSSFReader r = new XSSFReader(pkg);
- SharedStringsTable sst = r.getSharedStringsTable();
-
- XMLReader parser = fetchSheetParser(sst);
-
- // process the first sheet
- InputStream sheet2 = r.getSheetsData().next();
- InputSource sheetSource = new InputSource(sheet2);
- parser.parse(sheetSource);
- sheet2.close();
- }
- }
-
- public void processAllSheets(String filename) throws Exception {
- try (OPCPackage pkg = OPCPackage.open(filename, PackageAccess.READ)) {
- XSSFReader r = new XSSFReader(pkg);
- SharedStringsTable sst = r.getSharedStringsTable();
-
- XMLReader parser = fetchSheetParser(sst);
-
- Iterator<InputStream> sheets = r.getSheetsData();
- while (sheets.hasNext()) {
- System.out.println("Processing new sheet:\n");
- InputStream sheet = sheets.next();
+ public void processFirstSheet(String filename) throws Exception {
+ try (OPCPackage pkg = OPCPackage.open(filename, PackageAccess.READ)) {
+ XSSFReader r = new XSSFReader(pkg);
+ SharedStringsTable sst = r.getSharedStringsTable();
+
+ XMLReader parser = fetchSheetParser(sst);
+
+ // process the first sheet
+ try (InputStream sheet = r.getSheetsData().next()) {
InputSource sheetSource = new InputSource(sheet);
parser.parse(sheetSource);
- sheet.close();
- System.out.println("");
}
- }
- }
-
- public XMLReader fetchSheetParser(SharedStringsTable sst) throws SAXException {
- XMLReader parser = XMLReaderFactory.createXMLReader();
- ContentHandler handler = new SheetHandler(sst);
- parser.setContentHandler(handler);
- return parser;
- }
-
- /**
- * See org.xml.sax.helpers.DefaultHandler javadocs
- */
- private static class SheetHandler extends DefaultHandler {
- private final SharedStringsTable sst;
- private String lastContents;
- private boolean nextIsString;
- private boolean inlineStr;
- private final LruCache<Integer,String> lruCache = new LruCache<>(50);
-
- private static class LruCache<A,B> extends LinkedHashMap<A, B> {
- private final int maxEntries;
-
- public LruCache(final int maxEntries) {
- super(maxEntries + 1, 1.0f, true);
- this.maxEntries = maxEntries;
- }
-
- @Override
- protected boolean removeEldestEntry(final Map.Entry<A, B> eldest) {
- return super.size() > maxEntries;
- }
- }
-
- private SheetHandler(SharedStringsTable sst) {
- this.sst = sst;
- }
-
- @Override
+ }
+ }
+
+ public void processAllSheets(String filename) throws Exception {
+ try (OPCPackage pkg = OPCPackage.open(filename, PackageAccess.READ)) {
+ XSSFReader r = new XSSFReader(pkg);
+ SharedStringsTable sst = r.getSharedStringsTable();
+
+ XMLReader parser = fetchSheetParser(sst);
+
+ Iterator<InputStream> sheets = r.getSheetsData();
+ while (sheets.hasNext()) {
+ System.out.println("Processing new sheet:\n");
+ try (InputStream sheet = sheets.next()) {
+ InputSource sheetSource = new InputSource(sheet);
+ parser.parse(sheetSource);
+ }
+ System.out.println("");
+ }
+ }
+ }
+
+ public XMLReader fetchSheetParser(SharedStringsTable sst) throws SAXException, ParserConfigurationException {
+ XMLReader parser = SAXHelper.newXMLReader();
+ ContentHandler handler = new SheetHandler(sst);
+ parser.setContentHandler(handler);
+ return parser;
+ }
+
+ /**
+ * See org.xml.sax.helpers.DefaultHandler javadocs
+ */
+ private static class SheetHandler extends DefaultHandler {
+ private final SharedStringsTable sst;
+ private String lastContents;
+ private boolean nextIsString;
+ private boolean inlineStr;
+ private final LruCache<Integer,String> lruCache = new LruCache<>(50);
+
+ private static class LruCache<A,B> extends LinkedHashMap<A, B> {
+ private final int maxEntries;
+
+ public LruCache(final int maxEntries) {
+ super(maxEntries + 1, 1.0f, true);
+ this.maxEntries = maxEntries;
+ }
+
+ @Override
+ protected boolean removeEldestEntry(final Map.Entry<A, B> eldest) {
+ return super.size() > maxEntries;
+ }
+ }
+
+ private SheetHandler(SharedStringsTable sst) {
+ this.sst = sst;
+ }
+
+ @Override
public void startElement(String uri, String localName, String name,
- Attributes attributes) throws SAXException {
- // c => cell
- if(name.equals("c")) {
- // Print the cell reference
- System.out.print(attributes.getValue("r") + " - ");
- // Figure out if the value is an index in the SST
- String cellType = attributes.getValue("t");
- nextIsString = cellType != null && cellType.equals("s");
- inlineStr = cellType != null && cellType.equals("inlineStr");
- }
- // Clear contents cache
- lastContents = "";
- }
-
- @Override
+ Attributes attributes) throws SAXException {
+ // c => cell
+ if(name.equals("c")) {
+ // Print the cell reference
+ System.out.print(attributes.getValue("r") + " - ");
+ // Figure out if the value is an index in the SST
+ String cellType = attributes.getValue("t");
+ nextIsString = cellType != null && cellType.equals("s");
+ inlineStr = cellType != null && cellType.equals("inlineStr");
+ }
+ // Clear contents cache
+ lastContents = "";
+ }
+
+ @Override
public void endElement(String uri, String localName, String name)
- throws SAXException {
- // Process the last contents as required.
- // Do now, as characters() may be called more than once
- if(nextIsString) {
- Integer idx = Integer.valueOf(lastContents);
- lastContents = lruCache.get(idx);
- if (lastContents == null && !lruCache.containsKey(idx)) {
- lastContents = new XSSFRichTextString(sst.getEntryAt(idx)).toString();
- lruCache.put(idx, lastContents);
- }
- nextIsString = false;
- }
-
- // v => contents of a cell
- // Output after we've seen the string contents
- if(name.equals("v") || (inlineStr && name.equals("c"))) {
- System.out.println(lastContents);
- }
- }
-
- @Override
+ throws SAXException {
+ // Process the last contents as required.
+ // Do now, as characters() may be called more than once
+ if(nextIsString) {
+ Integer idx = Integer.valueOf(lastContents);
+ lastContents = lruCache.get(idx);
+ if (lastContents == null && !lruCache.containsKey(idx)) {
+ lastContents = new XSSFRichTextString(sst.getEntryAt(idx)).toString();
+ lruCache.put(idx, lastContents);
+ }
+ nextIsString = false;
+ }
+
+ // v => contents of a cell
+ // Output after we've seen the string contents
+ if(name.equals("v") || (inlineStr && name.equals("c"))) {
+ System.out.println(lastContents);
+ }
+ }
+
+ @Override
public void characters(char[] ch, int start, int length) throws SAXException { // NOSONAR
- lastContents += new String(ch, start, length);
- }
- }
-
- public static void main(String[] args) throws Exception {
- FromHowTo howto = new FromHowTo();
- howto.processFirstSheet(args[0]);
- howto.processAllSheets(args[0]);
- }
+ lastContents += new String(ch, start, length);
+ }
+ }
+
+ public static void main(String[] args) throws Exception {
+ FromHowTo howto = new FromHowTo();
+ howto.processFirstSheet(args[0]);
+ howto.processAllSheets(args[0]);
+ }
}
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