JAVA实现gif图片缩放与剪切功能

package com.pinker.util;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Image;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.util.Arrays;
import java.util.Iterator;

import javax.imageio.IIOImage;
import javax.imageio.ImageIO;
import javax.imageio.ImageReader;
import javax.imageio.ImageWriter;
import javax.imageio.stream.ImageInputStream;
import javax.imageio.stream.ImageOutputStream;

/**
* 图像裁剪以及压缩处理工具类
*
* 主要针对动态的GIF格式图片裁剪之后，只出现一帧动态效果的现象提供解决方案
*
* 提供依赖三方包解决方案（针对GIF格式数据特征一一解析，进行编码解码操作）
* 提供基于JDK Image I/O 的解决方案(JDK探索失败)
*/
public class ImageUtil2 {

public enum IMAGE_FORMAT{
BMP("bmp"),
JPG("jpg"),
WBMP("wbmp"),
JPEG("jpeg"),
PNG("png"),
GIF("gif");

private String value;
IMAGE_FORMAT(String value){
this.value = value;
}
public String getValue() {
return value;
}
public void setValue(String value) {
this.value = value;
}
}

/**
* 获取图片格式
* @param file   图片文件
* @return    图片格式
*/
public static String getImageFormatName(File file)throws IOException{
String formatName = null;

ImageInputStream iis = ImageIO.createImageInputStream(file);
Iterator<ImageReader> imageReader =  ImageIO.getImageReaders(iis);
if(imageReader.hasNext()){
ImageReader reader = imageReader.next();
formatName = reader.getFormatName();
}

return formatName;
}

/*************************  基于三方包解决方案    *****************************/
/**
* 剪切图片
*
* @param source        待剪切图片路径
* @param targetPath    裁剪后保存路径（默认为源路径）
* @param x                起始横坐标
* @param y                起始纵坐标
* @param width            剪切宽度
* @param height        剪切高度
*
* @returns            裁剪后保存路径（图片后缀根据图片本身类型生成）
* @throws IOException
*/
public static String cutImage(String sourcePath , String targetPath , int x , int y , int width , int height) throws IOException{
File file = new File(sourcePath);
if(!file.exists()) {
throw new IOException("not found the image：" + sourcePath);
}
if(null == targetPath || targetPath.isEmpty()) targetPath = sourcePath;

String formatName = getImageFormatName(file);
if(null == formatName) return targetPath;
formatName = formatName.toLowerCase();

// 防止图片后缀与图片本身类型不一致的情况
String pathPrefix = getPathWithoutSuffix(targetPath);
targetPath = pathPrefix + formatName;

// GIF需要特殊处理
if(IMAGE_FORMAT.GIF.getValue() == formatName){
GifDecoder decoder = new GifDecoder();
int status = decoder.read(sourcePath);
if (status != GifDecoder.STATUS_OK) {
throw new IOException("read image " + sourcePath + " error!");
}

AnimatedGifEncoder encoder = new AnimatedGifEncoder();
encoder.start(targetPath);
encoder.setRepeat(decoder.getLoopCount());
for (int i = 0; i < decoder.getFrameCount(); i ++) {
encoder.setDelay(decoder.getDelay(i));
BufferedImage childImage = decoder.getFrame(i);
BufferedImage image = childImage.getSubimage(x, y, width, height);
encoder.addFrame(image);
}
encoder.finish();
}else{
BufferedImage image = ImageIO.read(file);
image = image.getSubimage(x, y, width, height);
ImageIO.write(image, formatName, new File(targetPath));
}
//普通图片
BufferedImage image = ImageIO.read(file);
image = image.getSubimage(x, y, width, height);
ImageIO.write(image, formatName, new File(targetPath));

return targetPath;
}

/**
* 压缩图片
* @param sourcePath       待压缩的图片路径
* @param targetPath    压缩后图片路径（默认为初始路径）
* @param width            压缩宽度
* @param height        压缩高度
*
* @returns                   裁剪后保存路径（图片后缀根据图片本身类型生成）
* @throws IOException
*/
public static String zoom(String sourcePath , String targetPath, int width , int height) throws IOException{
File file = new File(sourcePath);
if(!file.exists()) {
throw new IOException("not found the image ：" + sourcePath);
}
if(null == targetPath || targetPath.isEmpty()) targetPath = sourcePath;

String formatName = getImageFormatName(file);
if(null == formatName) return targetPath;
formatName = formatName.toLowerCase();

// 防止图片后缀与图片本身类型不一致的情况
String pathPrefix = getPathWithoutSuffix(targetPath);
targetPath = pathPrefix + formatName;

// GIF需要特殊处理
if(IMAGE_FORMAT.GIF.getValue() == formatName){
GifDecoder decoder = new GifDecoder();
int status = decoder.read(sourcePath);
if (status != GifDecoder.STATUS_OK) {
throw new IOException("read image " + sourcePath + " error!");
}

AnimatedGifEncoder encoder = new AnimatedGifEncoder();
encoder.start(targetPath);
encoder.setRepeat(decoder.getLoopCount());
for (int i = 0; i < decoder.getFrameCount(); i ++) {
encoder.setDelay(decoder.getDelay(i));
BufferedImage image = zoom(decoder.getFrame(i), width , height);
encoder.addFrame(image);
}
encoder.finish();
}else{
BufferedImage image = ImageIO.read(file);
BufferedImage zoomImage = zoom(image , width , height);
ImageIO.write(zoomImage, formatName, new File(targetPath));
}
BufferedImage image = ImageIO.read(file);
BufferedImage zoomImage = zoom(image , width , height);
ImageIO.write(zoomImage, formatName, new File(targetPath));

return targetPath;
}

/*********************** 基于JDK 解决方案     ********************************/

/**
* 读取图片
* @param file 图片文件
* @return     图片数据
* @throws IOException
*/
public static BufferedImage[] readerImage(File file) throws IOException{
BufferedImage sourceImage = ImageIO.read(file);
BufferedImage[] images = null;
ImageInputStream iis = ImageIO.createImageInputStream(file);
Iterator<ImageReader> imageReaders = ImageIO.getImageReaders(iis);
if(imageReaders.hasNext()){
ImageReader reader = imageReaders.next();
reader.setInput(iis);
int imageNumber = reader.getNumImages(true);
images = new BufferedImage[imageNumber];
for (int i = 0; i < imageNumber; i++) {
BufferedImage image = reader.read(i);
if(sourceImage.getWidth() > image.getWidth() || sourceImage.getHeight() > image.getHeight()){
image = zoom(image, sourceImage.getWidth(), sourceImage.getHeight());
}
images[i] = image;
}
reader.dispose();
iis.close();
}
return images;
}

/**
* 根据要求处理图片
*
* @param images    图片数组
* @param x            横向起始位置
* @param y         纵向起始位置
* @param width      宽度
* @param height    宽度
* @return            处理后的图片数组
* @throws Exception
*/
public static BufferedImage[] processImage(BufferedImage[] images , int x , int y , int width , int height) throws Exception{
if(null == images){
return images;
}
BufferedImage[] oldImages = images;
images = new BufferedImage[images.length];
for (int i = 0; i < oldImages.length; i++) {
BufferedImage image = oldImages[i];
images[i] = image.getSubimage(x, y, width, height);
}
return images;
}

/**
* 写入处理后的图片到file
*
* 图片后缀根据图片格式生成
*
* @param images        处理后的图片数据
* @param formatName     图片格式
* @param file            写入文件对象
* @throws Exception
*/
public static void writerImage(BufferedImage[] images ,  String formatName , File file) throws Exception{
Iterator<ImageWriter> imageWriters = ImageIO.getImageWritersByFormatName(formatName);
if(imageWriters.hasNext()){
ImageWriter writer = imageWriters.next();
String fileName = file.getName();
int index = fileName.lastIndexOf(".");
if(index > 0){
fileName = fileName.substring(0, index + 1) + formatName;
}
String pathPrefix = getFilePrefixPath(file.getPath());
File outFile = new File(pathPrefix + fileName);
ImageOutputStream ios = ImageIO.createImageOutputStream(outFile);
writer.setOutput(ios);

if(writer.canWriteSequence()){
writer.prepareWriteSequence(null);
for (int i = 0; i < images.length; i++) {
BufferedImage childImage = images[i];
IIOImage image = new IIOImage(childImage, null , null);
writer.writeToSequence(image, null);
}
writer.endWriteSequence();
}else{
for (int i = 0; i < images.length; i++) {
writer.write(images[i]);
}
}

writer.dispose();
ios.close();
}
}

/**
* 剪切格式图片
*
* 基于JDK Image I/O解决方案
*
* @param sourceFile        待剪切图片文件对象
* @param destFile                  裁剪后保存文件对象
* @param x                    剪切横向起始位置
* @param y                 剪切纵向起始位置
* @param width              剪切宽度
* @param height            剪切宽度
* @throws Exception
*/
public static void cutImage(File sourceFile , File destFile, int x , int y , int width , int height) throws Exception{
// 读取图片信息
BufferedImage[] images = readerImage(sourceFile);
// 处理图片
images = processImage(images, x, y, width, height);
// 获取文件后缀
String formatName = getImageFormatName(sourceFile);
destFile = new File(getPathWithoutSuffix(destFile.getPath()) + formatName);

// 写入处理后的图片到文件
writerImage(images, formatName , destFile);
}

/**
* 获取系统支持的图片格式
*/
public static void getOSSupportsStandardImageFormat(){
String[] readerFormatName = ImageIO.getReaderFormatNames();
String[] readerSuffixName = ImageIO.getReaderFileSuffixes();
String[] readerMIMEType = ImageIO.getReaderMIMETypes();
System.out.println("========================= OS supports reader ========================");
System.out.println("OS supports reader format name :  " + Arrays.asList(readerFormatName));
System.out.println("OS supports reader suffix name :  " + Arrays.asList(readerSuffixName));
System.out.println("OS supports reader MIME type :  " + Arrays.asList(readerMIMEType));

String[] writerFormatName = ImageIO.getWriterFormatNames();
String[] writerSuffixName = ImageIO.getWriterFileSuffixes();
String[] writerMIMEType = ImageIO.getWriterMIMETypes();

System.out.println("========================= OS supports writer ========================");
System.out.println("OS supports writer format name :  " + Arrays.asList(writerFormatName));
System.out.println("OS supports writer suffix name :  " + Arrays.asList(writerSuffixName));
System.out.println("OS supports writer MIME type :  " + Arrays.asList(writerMIMEType));
}

/**
* 压缩图片
* @param sourceImage    待压缩图片
* @param width          压缩图片高度
* @param heigt          压缩图片宽度
*/
private static BufferedImage zoom(BufferedImage sourceImage , int width , int height){
BufferedImage zoomImage = new BufferedImage(width, height, sourceImage.getType());
Image image = sourceImage.getScaledInstance(width, height, Image.SCALE_SMOOTH);
Graphics gc = zoomImage.getGraphics();
gc.setColor(Color.WHITE);
gc.drawImage( image , 0, 0, null);
return zoomImage;
}

/**
* 获取某个文件的前缀路径
*
* 不包含文件名的路径
*
* @param file   当前文件对象
* @return
* @throws IOException
*/
public static String getFilePrefixPath(File file) throws IOException{
String path = null;
if(!file.exists()) {
throw new IOException("not found the file !" );
}
String fileName = file.getName();
path = file.getPath().replace(fileName, "");
return path;
}

/**
* 获取某个文件的前缀路径
*
* 不包含文件名的路径
*
* @param path   当前文件路径
* @return       不包含文件名的路径
* @throws Exception
*/
public static String getFilePrefixPath(String path) throws Exception{
if(null == path || path.isEmpty()) throw new Exception("文件路径为空！");
int index = path.lastIndexOf(File.separator);
if(index > 0){
path = path.substring(0, index + 1);
}
return path;
}

/**
* 获取不包含后缀的文件路径
*
* @param src
* @return
*/
public static String getPathWithoutSuffix(String src){
String path = src;
int index = path.lastIndexOf(".");
if(index > 0){
path = path.substring(0, index + 1);
}
return path;
}

/**
* 获取文件名
* @param filePath        文件路径
* @return                文件名
* @throws IOException
*/
public static String getFileName(String filePath) throws IOException{
File file = new File(filePath);
if(!file.exists()) {
throw new IOException("not found the file !" );
}
return file.getName();
}

/**
* @param args
* @throws Exception
*/
public static void main(String[] args) throws Exception {
// 获取系统支持的图片格式
//ImageCutterUtil.getOSSupportsStandardImageFormat();

try {
// 起始坐标，剪切大小
int x = 100;
int y = 75;
int width = 100;
int height = 100;
// 参考图像大小
int clientWidth = 300;
int clientHeight = 250;

File file = new File("C:\\1.jpg");
BufferedImage image = ImageIO.read(file);
double destWidth = image.getWidth();
double destHeight = image.getHeight();

if(destWidth < width || destHeight < height)
throw new Exception("源图大小小于截取图片大小!");

double widthRatio = destWidth / clientWidth;
double heightRatio = destHeight / clientHeight;

x = Double.valueOf(x * widthRatio).intValue();
y = Double.valueOf(y * heightRatio).intValue();
width = Double.valueOf(width * widthRatio).intValue();
height = Double.valueOf(height * heightRatio).intValue();

System.out.println("裁剪大小  x:" + x + ",y:" + y + ",width:" + width + ",height:" + height);

/************************ 基于三方包解决方案 *************************/
String formatName = getImageFormatName(file);
String pathSuffix = "." + formatName;
String pathPrefix = getFilePrefixPath(file);
String targetPath = pathPrefix  + System.currentTimeMillis() + pathSuffix;
targetPath = ImageUtil2.cutImage(file.getPath(), targetPath, x , y , width, height);

String bigTargetPath = pathPrefix  + System.currentTimeMillis() + pathSuffix;
ImageUtil2.zoom(targetPath, bigTargetPath, 100, 100);

String smallTargetPath = pathPrefix  + System.currentTimeMillis() + pathSuffix;
ImageUtil2.zoom(targetPath, smallTargetPath, 50, 50);

/************************ 基于JDK Image I/O 解决方案(JDK探索失败) *************************/
//	            File destFile = new File(targetPath);
//	            ImageCutterUtil.cutImage(file, destFile, x, y, width, height);
} catch (IOException e) {
e.printStackTrace();
}
}
}