What Is poi-5.2.3.jar?

What Is poi-5.2.3.jar?

✍: FYIcenter.com

poi-5.2.3.jar is one of the JAR files for Apache POI 5.2.3, which provides an API for Microsoft document files of Word, Excel, PowerPoint, and Visio.

poi-5.2.3.jar supports Apache POI components that read and write Microsoft's OLE 2 Compound document format, which is used in early versions of Microsoft Office tools like Word 97, Excel 97, PowerPoint 97, etc.

poi-5.2.3.jar is distributed as part of the poi-bin-5.2.3-20220909.zip download file.

JAR File Size and Download Location:

JAR name: poi-5.2.3.jar
Target JDK version: 9

File name: poi.jar, poi-5.2.3.jar
File size: 2964641 bytes
Release date: 09-09-2022
Download: Apache POI Website

Here are Java Source Code files for poi-5.2.3.jar:


/* ====================================================================
   Licensed to the Apache Software Foundation (ASF) under one or more
   contributor license agreements.  See the NOTICE file distributed with
   this work for additional information regarding copyright ownership.
   The ASF licenses this file to You under the Apache License, Version 2.0
   (the "License"); you may not use this file except in compliance with
   the License.  You may obtain a copy of the License at


   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   See the License for the specific language governing permissions and
   limitations under the License.
==================================================================== */

package org.apache.poi.poifs.filesystem;

import java.io.IOException;
import java.io.OutputStream;

import org.apache.commons.io.input.UnsynchronizedByteArrayInputStream;
import org.apache.commons.io.output.UnsynchronizedByteArrayOutputStream;
import org.apache.poi.poifs.common.POIFSConstants;
import org.apache.poi.poifs.property.DocumentProperty;

 * This class provides methods to write a DocumentEntry managed by a
 * {@link POIFSFileSystem} instance.
public final class DocumentOutputStream extends OutputStream {
    /** the Document's size, i.e. the size of the big block data - mini block data is cached and not counted */
    private int _document_size = 0;

    /** have we been closed? */
    private boolean _closed = false;

    /** the actual Document */
    private final POIFSDocument _document;
    /** and its Property */
    private final DocumentProperty _property;

    /** our buffer, when null we're into normal blocks */
    private UnsynchronizedByteArrayOutputStream _buffer =
            new UnsynchronizedByteArrayOutputStream(POIFSConstants.BIG_BLOCK_MINIMUM_DOCUMENT_SIZE);

    /** our main block stream, when we're into normal blocks */
    private POIFSStream _stream;
    private OutputStream _stream_output;

    /** a write limit or -1 if unlimited */
    private final long _limit;

     * Create an OutputStream from the specified DocumentEntry.
     * The specified entry will be emptied.
     * @param document the DocumentEntry to be written
    public DocumentOutputStream(DocumentEntry document) throws IOException {
        this(document, -1);

     * Create an OutputStream to create the specified new Entry
     * @param parent Where to create the Entry
     * @param name Name of the new entry
    public DocumentOutputStream(DirectoryEntry parent, String name) throws IOException {
        this(createDocument(parent, name), -1);

     * Create a DocumentOutputStream
     * @param document the DocumentEntry to which the data is actually written
     * @param limit the maximum number of bytes that can be written
    DocumentOutputStream(DocumentEntry document, long limit) throws IOException {
        this(getDocument(document), limit);

    DocumentOutputStream(POIFSDocument document, long limit) throws IOException {
        _document = document;

        _property = document.getDocumentProperty();

        _limit   = limit;

    private static POIFSDocument getDocument(DocumentEntry document) throws IOException {
        if (!(document instanceof DocumentNode)) {
            throw new IOException("Cannot open internal document storage, " + document + " not a Document Node");
        return new POIFSDocument((DocumentNode)document);

    private static DocumentEntry createDocument(DirectoryEntry parent, String name) throws IOException {
        if (!(parent instanceof DirectoryNode)) {
            throw new IOException("Cannot open internal directory storage, " + parent + " not a Directory Node");

        // Have an empty one created for now
        return parent.createDocument(name, new UnsynchronizedByteArrayInputStream(new byte[0]));

    private void checkBufferSize() throws IOException {
        // Have we gone over the mini stream limit yet?
        if (_buffer.size() > POIFSConstants.BIG_BLOCK_MINIMUM_DOCUMENT_SIZE) {
            // Will need to be in the main stream
            byte[] data = _buffer.toByteArray();
            _buffer = null;
            write(data, 0, data.length);
        // otherwise mini stream will work, keep going

    public void write(int b) throws IOException {
        write(new byte[] { (byte)b }, 0, 1);

    public void write(byte[] b, int off, int len) throws IOException {
        if (_closed) {
            throw new IOException("cannot perform requested operation on a closed stream");
        if (_limit > -1 && (size() + len) > _limit) {
            throw new IOException("tried to write too much data");

        if (_buffer != null) {
            _buffer.write(b, off, len);
        } else {
            if (_stream == null) {
                _stream = new POIFSStream(_document.getFileSystem());
                _stream_output = _stream.getOutputStream();
            _stream_output.write(b, off, len);
            _document_size += len;

    public void close() throws IOException {
        // Do we have a pending buffer for the mini stream?
        if (_buffer != null) {
            // It's not much data, so ask POIFSDocument to do it for us
        else {
            // We've been writing to the stream as we've gone along
            // Update the details on the property now

        // No more!
        _closed = true;

     * @return the amount of written bytes
    public long size() {
        return _document_size + (_buffer == null ? 0L : _buffer.size());


Or download all of them as a single archive file:

File name: poi-5.2.3-src.zip
File size: 2479830 bytes
Release date: 2022-09-09


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