关于 java 显示GIF

1.java 直接使用JLabel显示GIF图片速度总会特别快不能控制，需要自己写控件去实现JLaebl的功能

package Main;

import java.awt.Graphics;

import java.awt.image.BufferedImage;

import java.io.File;

import java.io.IOException;

import java.util.ArrayList;

import java.util.HashMap;

import java.util.Iterator;

import java.util.List;

import java.util.Map;

import java.util.Timer;

import java.util.TimerTask;

import javax.imageio.ImageIO;

import javax.imageio.ImageReader;

import javax.imageio.stream.ImageInputStream;

import javax.swing.JLabel;

import com.sun.imageio.plugins.gif.GIFImageMetadata;

public class GifComponent extends JLabel {

private static final long serialVersionUID = 1L;

private GifBean[] gifBeans;

private Map<Integer, Integer[]> gifBeanMap = new HashMap<Integer, Integer[]>();

private int index = 0;

private int delayFactor;

private Timer timer;



/**

*

* @param gifFile

* @param delayFactor

* 显示gif每帧图片的时间因子

*/

public GifComponent(File gifFile, int delayFactor,int width,int height) {

setDelayFactor(delayFactor);

setGifFile(gifFile,width,height);

}



/**

* 设置Gif文件

*

* @param gifFile

*/

public void setGifFile(File gifFile,int width,int height) {

ImageReader reader = null;

try {

ImageInputStream imageIn = ImageIO.createImageInputStream(gifFile);

Iterator<ImageReader> iter = ImageIO

.getImageReadersByFormatName("gif");

if (iter.hasNext()) {

reader = iter.next();

}

reader.setInput(imageIn, false);

gifBeanMap.clear();

gifBeans = new GifBean[reader.getNumImages(true)];

GIFImageMetadata meta = null;

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

meta = (GIFImageMetadata) reader.getImageMetadata(i);

gifBeans[i] = new GifBean();



BufferedImage originalImage =reader.read(i);

BufferedImage newImage = new BufferedImage(width,height,originalImage.getType());

Graphics g = newImage.getGraphics();

g.drawImage(originalImage, 0,0,width,height,null);

g.dispose();



gifBeans[i].image = newImage;

gifBeans[i].x = meta.imageLeftPosition;

gifBeans[i].y = meta.imageTopPosition;

gifBeans[i].width = meta.imageWidth;

gifBeans[i].height = meta.imageHeight;

gifBeans[i].disposalMethod = meta.disposalMethod;

gifBeans[i].delayTime = meta.delayTime == 0 ? 1

: meta.delayTime;

}

for (int i = 1; i < gifBeans.length; i++) {

if (gifBeans[i].disposalMethod == 2) {

gifBeanMap.put(new Integer(i), new Integer[] { i });

continue;

}

int firstIndex = getFirstIndex(i);

List<Integer> list = new ArrayList<Integer>();

for (int j = firstIndex; j <= i; j++) {

list.add(j);

}

gifBeanMap.put(new Integer(i), list.toArray(new Integer[] {}));

}

} catch (IOException e) {

e.printStackTrace();

}

setTimer();

}



private synchronized void setTimer() {

if (timer != null) {

timer.cancel();

}

timer = new Timer("show gif");

timer.schedule(new TimerTask() {

@Override

public void run() {

repaint();

try {

Thread.sleep(gifBeans[index].delayTime * delayFactor);

} catch (InterruptedException e) {

}

index++;

if (index >= gifBeans.length) {

index = 0;

}

}



}, 0, 1);



}



/**

* 设置时间因子

*

* @param delayFactor

*/

public void setDelayFactor(int delayFactor) {

this.delayFactor = delayFactor;

}



@Override

protected void paintComponent(Graphics g) {

g.drawImage(gifBeans[0].image, gifBeans[0].x, gifBeans[0].y, this);

if (index > 0) {

Integer[] array = gifBeanMap.get(index);

for (Integer i : array) {

g.drawImage(gifBeans[i].image, gifBeans[i].x, gifBeans[i].y,

this);

}

}

}



private int getFirstIndex(int index) {

int tempIndex = index;

while (tempIndex > 1) {

if (tempIndex - 1 > 0

&& gifBeans[tempIndex - 1].disposalMethod == 2) {

return index;

}

tempIndex--;

}

return tempIndex;

}



/**

* 用于保持gif每帧图片的信息

*/

public class GifBean {

public BufferedImage image;

public int x;

public int y;

public int width;

public int height;

public int disposalMethod;

public int delayTime;

}



}

在Jframe 中加入该组件的方法：

public GIFShow(String pathOfGif) {

setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

setBounds(500, 200, 421, 322);

contentPane = new JPanel();

contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));

setContentPane(contentPane);

contentPane.setLayout(null);



// 使用系统自带的Label显示GIF

// label = new JLabel("");

// label.setBounds(0, 0, 413, 288);

// contentPane.add(label);

// ImageIcon ic1=new ImageIcon(pathOfGif);

// ic1.setImage(ic1.getImage().getScaledInstance(label.getWidth(), label.getHeight(), Image.SCALE_DEFAULT));

// label.setIcon(ic1);







//使用自己的组件显示GIF

GifComponent gifComponent=new GifComponent(new File(pathOfGif), 120,413,288);

gifComponent.setBounds(0, 0, 413, 288);

contentPane.add(gifComponent);

}

其中改变Bufferdimage 的尺寸大小的方法:

BufferedImage originalImage = 你的原图片

int width = 宽度;
int height = 高度;
BufferedImage newImage = new BufferedImage(width,height,originalImage.getType());
Graphics g = newImage.getGraphics();
g.drawImage(originalImage, 0,0,width,height,null);
g.dispose();

newImage 中存储的便是改变尺寸之后的Bufferdimage