testhssfpicturedata.java

java 读写word excel ppt

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/*
 * HSSFWorkbook.java
 *
 * Created on September 30, 2001, 3:37 PM
 */
package org.apache.poi.hssf.usermodel;

import junit.framework.TestCase;

import javax.imageio.ImageIO;
import java.io.*;
import java.util.*;
import java.awt.image.BufferedImage;

/**
 * Test <code>HSSFPictureData</code>.
 * The code to retrieve images from a workbook provided by Trejkaz (trejkaz at trypticon dot org) in Bug 41223.
 *
 * @author Yegor Kozlov (yegor at apache dot org)
 * @author Trejkaz (trejkaz at trypticon dot org)
 */
public class TestHSSFPictureData extends TestCase{

    static String cwd = System.getProperty("HSSF.testdata.path");

    public void testPictures() throws IOException {
        FileInputStream is = new FileInputStream(new File(cwd, "SimpleWithImages.xls"));
        HSSFWorkbook wb = new HSSFWorkbook(is);
        is.close();

        List lst = wb.getAllPictures();
        assertEquals(2, lst.size());

        for (Iterator it = lst.iterator(); it.hasNext(); ) {
            HSSFPictureData pict = (HSSFPictureData)it.next();
            String ext = pict.suggestFileExtension();
            byte[] data = pict.getData();
            if (ext.equals("jpeg")){
                //try to read image data using javax.imageio.* (JDK 1.4+)
                BufferedImage jpg = ImageIO.read(new ByteArrayInputStream(data));
                assertNotNull(jpg);
                assertEquals(192, jpg.getWidth());
                assertEquals(176, jpg.getHeight());
            } else if (ext.equals("png")){
                //try to read image data using javax.imageio.* (JDK 1.4+)
                BufferedImage png = ImageIO.read(new ByteArrayInputStream(data));
                assertNotNull(png);
                assertEquals(300, png.getWidth());
                assertEquals(300, png.getHeight());

            } else {
                fail("unexpected picture type: " + ext);
            }
        }

    }
}