java 图片处理

anly — Thu, 21 Feb 2008 06:02:00 GMT

//http://www.fmsware.com/stuff/gif.zip
//先下程序中需要用到的包

//class GifDD

import image.AnimatedGifEncoder;
import image.GifDecoder;

import java.awt.image.BufferedImage;

import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;

import javax.imageio.ImageIO;

public class GifDD {

    public static String[] delay; // 延迟时间

    public Map map = new HashMap();

    /**
    * 把gif图片按帧拆分成jpg图片
    *
    * @param gifName
    *            String 原图路径
    *
    * @return BufferedImage[] 返回生成的文件流
    */

    private BufferedImage[] splitGif(String gifName) {

        try {

            GifDecoder decoder = new GifDecoder();

            decoder.read(gifName);

            // decoder.read(BufferedInputStream);

            // decoder.read(InputStream);

            int n = decoder.getFrameCount(); // 得到frame的个数

            BufferedImage[] subPic = new BufferedImage[n]; //

            delay = new String[n]; // 存储延迟时间

            for (int i = 0; i < n; i++) {

                BufferedImage frame = decoder.getFrame(i); // 得到帧

                delay[i] = decoder.getDelay(i) + ""; // 得到延迟时间

                // 生成小的JPG文件
                subPic[i] = frame;

            }
            return subPic;
        } catch (Exception e) {
            System.out.println("splitGif Failed!");
            e.printStackTrace();
            return null;
        }
    }

    /**
    * 把多张jpg图片合成一张
    *
    * @param bi
    *            BufferedImage[] 多个文件流文件名
    * @param newPic
    *            String 生成的gif文件名包含路径
    * @param _delay
    *            String[] 播放的时间
    */

    private void jpgToGif(BufferedImage bi[], String newPic, String _delay[]) {
        try {

            AnimatedGifEncoder e = new AnimatedGifEncoder(); // 网上可以找到此类

            e.setRepeat(0);

            e.start(newPic);

            for (int i = 0; i < bi.length; i++) {

                // src[i] = ImageIO.read(new File(pic[i])); // 读入需要播放的jpg文件

                // e.addFrame(src[i]); // 添加到帧中

                e.setDelay(new Integer(_delay[i]));// 设置播放的延迟时间

                e.addFrame(bi[i]);// 添加到帧中

            }
            e.finish();
        } catch (Exception e) {
            System.out.println("jpgToGif Failed:");
            e.printStackTrace();
        }
    }

    // 处理图片

    /**
    * 把多张jpg图片进行处理
    *
    * @param bi
    *            BufferedImage[] 多个文件流文件名
    * @param width
    *            String 缩放的宽度
    * @param height
    *            String 缩放的高度
    * @return BufferedImage[] 返回生成的文件流
    */

    public BufferedImage[] changeImage(BufferedImage[] bi, double width,
            double height) {

        BufferedImage src = null;

        // 存width , height

        int saveWidth = 0;

        int saveHeight = 0;

        BufferedImage[] backBi = new BufferedImage[bi.length];

        for (int i = 0; i < bi.length; i++) {

            double __width = new Double(bi[i].getWidth() + ""); // src width

            double __height = new Double(bi[i].getHeight() + ""); // src
            // height

            if (bi[i].getHeight() <= width && bi[i].getWidth() <= height) {

                saveWidth = new Double(width).intValue();

                saveHeight = new Double(height).intValue();

            }

            else if ((width / height) >= (__width / __height)) {

                saveWidth = new Double(__width / __height * height).intValue();

                saveHeight = new Double(height).intValue();

            } else {

                saveHeight = new Double((__height / __width) * width)
                        .intValue();

                saveWidth = new Double(width).intValue();

            }

            BufferedImage tag = new BufferedImage(saveWidth, saveHeight,
                    BufferedImage.TYPE_INT_RGB);

            // 绘制缩小后的图

            tag.getGraphics().drawImage(bi[i], 0, 0, saveWidth, saveHeight,
                    null); //

            backBi[i] = tag;

        }

        // 绘制缩小后的图

        return backBi;

    }

    /**
    * 把多张jpg图片进行存盘
    *
    * @param bi
    *            BufferedImage[] 多个文件流文件名
    * @param savePath
    *            String 存放的路径
    *
    */
    public void saveImage(BufferedImage[] bi, String savePath) {

        FileOutputStream out = null;

        for (int i = 0; i < bi.length; i++) {

            String path = savePath + "\\" + i + ".jpg";

            try {

                out = new FileOutputStream(path);

                ImageIO.write(bi[i], "jpeg", out);// 存盘

                // JPEGImageEncoder encoder =
                // JPEGCodec.createJPEGEncoder(savePath);
                //
                // encoder.encode(bi[i]);

                out.flush();

                out.close();

            } catch (FileNotFoundException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }

        }

    }

    public static void main(String[] args) {

        BufferedImage[] bi = new GifDD().splitGif("e:\\a.gif");

        new GifDD().saveImage(bi, "e:\\");

        BufferedImage[] backbi = new GifDD().changeImage(bi, 32, 32);

        new GifDD().saveImage(backbi, "e:\\images");

        new GifDD().jpgToGif(backbi, "e:\\_a.gif", delay);

    }
}

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java 图片处理