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Apache POI Examples
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/* ====================================================================
   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

       http://www.apache.org/licenses/LICENSE-2.0

   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the License.
==================================================================== */

package org.apache.poi.examples.hssf.usermodel;

import java.io.FileOutputStream;
import java.io.IOException;

import org.apache.poi.hssf.usermodel.HSSFComment;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.ClientAnchor;
import org.apache.poi.ss.usermodel.Comment;
import org.apache.poi.ss.usermodel.CreationHelper;
import org.apache.poi.ss.usermodel.Drawing;
import org.apache.poi.ss.usermodel.Font;
import org.apache.poi.ss.usermodel.IndexedColors;
import org.apache.poi.ss.usermodel.RichTextString;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.ss.usermodel.WorkbookFactory;

/**
 * Demonstrates how to work with excel cell comments.
 *
 * Excel comment is a kind of a text shape,
 * so inserting a comment is very similar to placing a text box in a worksheet
 */
public class CellComments {

    public static void main(String[] args) throws IOException  {
        createWorkbook(false, ".xls");
        createWorkbook(true, ".xlsx");
    }

    private static void createWorkbook(boolean xssf, String extension) throws IOException {
        try (Workbook wb = WorkbookFactory.create(xssf)) {
            Sheet sheet = wb.createSheet("Cell comments in POI " + extension);
            CreationHelper creationHelper = wb.getCreationHelper();

            // Create the drawing patriarch. This is the top level container for all shapes including cell comments.
            Drawing patr = sheet.createDrawingPatriarch();

            //create a cell in row 3
            Cell cell1 = sheet.createRow(3).createCell(1);
            cell1.setCellValue(creationHelper.createRichTextString("Hello, World"));

            //anchor defines size and position of the comment in worksheet
            ClientAnchor clientAnchor = creationHelper.createClientAnchor();
            clientAnchor.setCol1(4);
            clientAnchor.setRow1(2);
            clientAnchor.setCol2(6);
            clientAnchor.setRow2(5);
            Comment comment1 = patr.createCellComment(clientAnchor);

            // set text in the comment
            comment1.setString(creationHelper.createRichTextString("We can set comments in POI"));

            //set comment author.
            //you can see it in the status bar when moving mouse over the commented cell
            comment1.setAuthor("Apache Software Foundation");

            // The first way to assign comment to a cell is via Cell.setCellComment method
            cell1.setCellComment(comment1);

            //create another cell in row 6
            Cell cell2 = sheet.createRow(6).createCell(1);
            cell2.setCellValue(36.6);


            clientAnchor = creationHelper.createClientAnchor();
            clientAnchor.setCol1(4);
            clientAnchor.setRow1(8);
            clientAnchor.setCol2(6);
            clientAnchor.setRow2(11);
            Comment comment2 = patr.createCellComment(clientAnchor);
            //modify background color of the comment, only available in HSSF currently
            if (wb instanceof HSSFWorkbook) {
                ((HSSFComment) comment2).setFillColor(204, 236, 255);
            }

            RichTextString string = creationHelper.createRichTextString("Normal body temperature");

            //apply custom font to the text in the comment
            Font font = wb.createFont();
            font.setFontName("Arial");
            font.setFontHeightInPoints((short) 10);
            font.setBold(true);
            font.setColor(IndexedColors.RED.getIndex());
            string.applyFont(font);

            comment2.setString(string);
            comment2.setVisible(true); //by default comments are hidden. This one is always visible.

            comment2.setAuthor("Bill Gates");

            /*
             * The second way to assign comment to a cell is to implicitly specify its row and column.
             * Note, it is possible to set row and column of a non-existing cell.
             * It works, the comment is visible.
             */
            comment2.setRow(6);
            comment2.setColumn(1);

            try (FileOutputStream out = new FileOutputStream("poi_comment" + extension)) {
                wb.write(out);
            }
        }
    }
}