Java教程
Java 工具类 - 纯JAVA实现的图片处理工具类
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package com.tgb.hz.file;
import java.awt.AlphaComposite;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.Rectangle;
import java.awt.RenderingHints;
import java.awt.Robot;
import java.awt.Toolkit;
import java.awt.geom.RoundRectangle2D;
import java.awt.image.BufferedImage;
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.URL;
import java.util.Iterator;
import javax.imageio.IIOImage;
import javax.imageio.ImageIO;
import javax.imageio.ImageWriteParam;
import javax.imageio.ImageWriter;
import javax.imageio.stream.ImageOutputStream;
import org.apache.commons.io.FilenameUtils;
import org.apache.commons.io.IOUtils;
import org.apache.commons.lang.StringUtils;
/**
* 纯JAVA实现的图片处理工具类
* @author hezhao
* @Time 2017年8月1日 下午7:42:12
*/
public class ImageUtil {
/**
* 抓屏程序
* @author hezhao
* @Time 2017年8月1日 下午7:42:07
* @param fileName
* @throws Exception
*/
public void captureScreen(String fileName) throws Exception {
Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
Rectangle screenRectangle = new Rectangle(screenSize);
Robot robot = new Robot();
BufferedImage image = robot.createScreenCapture(screenRectangle);
ImageIO.write(image, "png", new File(fileName));
}
/**
* 获取图片尺寸信息
*
* @param filePath
* a {@link String} object.
* @return [width, height]
*/
public static int[] getSizeInfo(String filePath) throws Exception {
File file = new File(filePath);
return getSizeInfo(file);
}
/**
* 获取图片尺寸信息
*
* @param url
* a {@link URL} object.
* @return [width,height]
*/
public static int[] getSizeInfo(URL url) throws Exception {
InputStream input = null;
try {
input = url.openStream();
return getSizeInfo(input);
} catch (IOException e) {
e.printStackTrace();
throw new Exception(e);
} finally {
IOUtils.closeQuietly(input);
}
}
/**
* 获取图片尺寸信息
*
* @param file
* a {@link File} object.
* @return [width,height]
*/
public static int[] getSizeInfo(File file) throws Exception {
if (!file.exists()) {
throw new Exception("file " + file.getAbsolutePath() + " doesn't exist.");
}
BufferedInputStream input = null;
try {
input = new BufferedInputStream(new FileInputStream(file));
return getSizeInfo(input);
} catch (FileNotFoundException e) {
e.printStackTrace();
throw new Exception(e);
} finally {
IOUtils.closeQuietly(input);
}
}
/**
* 获取图片尺寸
*
* @param input
* a {@link InputStream} object.
* @return [width,height]
*/
public static int[] getSizeInfo(InputStream input) throws Exception {
try {
BufferedImage img = ImageIO.read(input);
int w = img.getWidth(null);
int h = img.getHeight(null);
return new int[] { w, h };
} catch (IOException e) {
e.printStackTrace();
throw new Exception(e);
}
}
/**
* 重调图片尺寸
*
* @param srcFilePath
* 原图路径
* @param destFile
* 目标文件
* @param width
* 新的宽度，小于1则忽略，按原图比例缩放
* @param height
* 新的高度，小于1则忽略，按原图比例缩放
*/
public static void resize(String srcFilePath, String destFile, int width, int height) throws Exception {
resize(srcFilePath, destFile, width, height, -1, -1);
}
/**
* 重调图片尺寸
*
* @param input
* a {@link InputStream} object.
* @param output
* a {@link OutputStream} object.
* @param width
* a int.
* @param height
* a int.
*/
public static void resize(InputStream input, OutputStream output, int width, int height) throws Exception {
resize(input, output, width, height, -1, -1);
}
/**
* 重调图片尺寸
*
* @param input
* a {@link InputStream} object.
* @param output
* a {@link OutputStream} object.
* @param width
* a int.
* @param height
* a int.
* @param maxWidth
* a int.
* @param maxHeight
* a int.
*/
public static void resize(InputStream input, OutputStream output,
int width, int height, int maxWidth, int maxHeight) throws Exception {
if (width < 1 && height < 1 && maxWidth < 1 && maxHeight < 1) {
try {
IOUtils.copy(input, output);
} catch (IOException e) {
throw new Exception("resize error: ", e);
}
}
try {
BufferedImage img = ImageIO.read(input);
boolean hasNotAlpha = !img.getColorModel().hasAlpha();
double w = img.getWidth(null);
double h = img.getHeight(null);
int toWidth;
int toHeight;
double rate = w / h;
if (width > 0 && height > 0) {
rate = ((double) width) / ((double) height);
toWidth = width;
toHeight = height;
} else if (width > 0) {
toWidth = width;
toHeight = (int) (toWidth / rate);
} else if (height > 0) {
toHeight = height;
toWidth = (int) (toHeight * rate);
} else {
toWidth = ((Number) w).intValue();
toHeight = ((Number) h).intValue();
}
if (maxWidth > 0 && toWidth > maxWidth) {
toWidth = maxWidth;
toHeight = (int) (toWidth / rate);
}
if (maxHeight > 0 && toHeight > maxHeight) {
toHeight = maxHeight;
toWidth = (int) (toHeight * rate);
}
BufferedImage tag = new BufferedImage(toWidth, toHeight, hasNotAlpha ? BufferedImage.TYPE_INT_RGB : BufferedImage.TYPE_INT_ARGB);
// Image.SCALE_SMOOTH 的缩略算法 生成缩略图片的平滑度的 优先级比速度高 生成的图片质量比较好 但速度慢
tag.getGraphics().drawImage(img.getScaledInstance(toWidth, toHeight, Image.SCALE_SMOOTH), 0, 0, null);
ImageIO.write(tag, hasNotAlpha ? "jpg" : "png", output);
} catch (Exception e) {
e.printStackTrace();
throw new Exception(e);
} finally {
IOUtils.closeQuietly(input);
IOUtils.closeQuietly(output);
}
}
/**
* 重调图片尺寸
*
* @param srcFile
* 原图路径
* @param destFile
* 目标文件
* @param width
* 新的宽度，小于1则忽略，按原图比例缩放
* @param height
* 新的高度，小于1则忽略，按原图比例缩放
* @param maxWidth
* 最大宽度，限制目标图片宽度，小于1则忽略此设置
* @param maxHeight
* 最大高度，限制目标图片高度，小于1则忽略此设置
*/
public static void resize(String srcFile, String destFile, int width,
int height, int maxWidth, int maxHeight) throws Exception {
resize(new File(srcFile), new File(destFile), width, height, maxWidth, maxHeight);
}
/**
* 重调图片尺寸
*
* @param srcFile
* 原图路径
* @param destFile
* 目标文件
* @param width
* 新的宽度，小于1则忽略，按原图比例缩放
* @param height
* 新的高度，小于1则忽略，按原图比例缩放
*/
public static void resize(File srcFile, File destFile, int width, int height) throws Exception {
resize(srcFile, destFile, width, height, -1, -1);
}
/**
* 重调图片尺寸
*
* @param srcFile
* 原图路径
* @param destFile
* 目标文件
* @param width
* 新的宽度，小于1则忽略，按原图比例缩放
* @param height
* 新的高度，小于1则忽略，按原图比例缩放
* @param maxWidth
* 最大宽度，限制目标图片宽度，小于1则忽略此设置
* @param maxHeight
* 最大高度，限制目标图片高度，小于1则忽略此设置
*/
public static void resize(File srcFile, File destFile, int width,
int height, int maxWidth, int maxHeight) throws Exception {
if (destFile.exists()) {
destFile.delete();
} else {
FileUtil.mkDir(destFile.getParent());
}
InputStream input = null;
OutputStream output = null;
try {
input = new BufferedInputStream(new FileInputStream(srcFile));
output = new FileOutputStream(destFile);
resize(input, output, width, height, maxWidth, maxHeight);
} catch (FileNotFoundException e) {
e.printStackTrace();
throw new Exception(e);
} finally {
IOUtils.closeQuietly(input);
IOUtils.closeQuietly(output);
}
}
/**
* 裁剪图片
*
* @param source
* a {@link String} object.
* @param target
* a {@link String} object.
* @param x
* a int.
* @param y
* a int.
* @param w
* a int.
* @param h
* a int.
*/
public static void crop(String source, String target, int x, int y, int w, int h) throws Exception {
crop(new File(source), new File(target), x, y, w, h);
}
/**
* 裁剪图片
*
* @param source
* a {@link File} object.
* @param target
* a {@link File} object.
* @param x
* a int.
* @param y
* a int.
* @param w
* a int.
* @param h
* a int.
*/
public static void crop(File source, File target, int x, int y, int w, int h) throws Exception {
OutputStream output = null;
InputStream input = null;
String ext = FilenameUtils.getExtension(target.getName());
try {
input = new BufferedInputStream(new FileInputStream(source));
if (target.exists()) {
target.delete();
} else {
FileUtil.mkDir(target.getParent());
}
output = new BufferedOutputStream(new FileOutputStream(target));
} catch (IOException e) {
throw new Exception(e);
}
crop(input, output, x, y, w, h, StringUtils.equalsIgnoreCase("png", ext));
}
/**
* 裁剪图片
*
* @param x
* a int.
* @param y
* a int.
* @param w
* a int.
* @param h
* a int.
* @param input
* a {@link InputStream} object.
* @param output
* a {@link OutputStream} object.
* @param isPNG
* a boolean.
*/
public static void crop(InputStream input, OutputStream output, int x,
int y, int w, int h, boolean isPNG) throws Exception {
try {
BufferedImage srcImg = ImageIO.read(input);
int tmpWidth = srcImg.getWidth();
int tmpHeight = srcImg.getHeight();
int xx = Math.min(tmpWidth - 1, x);
int yy = Math.min(tmpHeight - 1, y);
int ww = w;
if (xx + w > tmpWidth) {
ww = Math.max(1, tmpWidth - xx);
}
int hh = h;
if (yy + h > tmpHeight) {
hh = Math.max(1, tmpHeight - yy);
}
BufferedImage dest = srcImg.getSubimage(xx, yy, ww, hh);
BufferedImage tag = new BufferedImage(w, h, isPNG ? BufferedImage.TYPE_INT_ARGB : BufferedImage.TYPE_INT_RGB);
tag.getGraphics().drawImage(dest, 0, 0, null);
ImageIO.write(tag, isPNG ? "png" : "jpg", output);
} catch (Exception e) {
e.printStackTrace();
throw new Exception(e);
} finally {
IOUtils.closeQuietly(input);
IOUtils.closeQuietly(output);
}
}
/**
* 压缩图片,PNG图片按JPG处理
*
* @param input
* a {@link InputStream} object.
* @param output
* a {@link OutputStream} object.
* @param quality
* 图片质量0-1之间
*/
public static final void optimize(InputStream input, OutputStream output, float quality) throws Exception {
// create a BufferedImage as the result of decoding the supplied
// InputStream
BufferedImage image;
ImageOutputStream ios = null;
ImageWriter writer = null;
try {
image = ImageIO.read(input);
// get all image writers for JPG format
Iterator<ImageWriter> writers = ImageIO.getImageWritersByFormatName("jpeg");
if (!writers.hasNext())
throw new IllegalStateException("No writers found");
writer = (ImageWriter) writers.next();
ios = ImageIO.createImageOutputStream(output);
writer.setOutput(ios);
ImageWriteParam param = writer.getDefaultWriteParam();
// optimize to a given quality
param.setCompressionMode(ImageWriteParam.MODE_EXPLICIT);
param.setCompressionQuality(quality);
// appends a complete image stream containing a single image and
// associated stream and image metadata and thumbnails to the output
writer.write(null, new IIOImage(image, null, null), param);
} catch (IOException e) {
e.printStackTrace();
throw new Exception(e);
} finally {
if (ios != null) {
try {
ios.close();
} catch (IOException e) {
e.printStackTrace();
throw new Exception(e);
}
}
writer.dispose();
}
}
/**
* 压缩图片
*
* @param source
* a {@link String} object.
* @param target
* a {@link String} object.
* @param quality
* a float.
*/
public static final void optimize(String source, String target, float quality) throws Exception {
File fromFile = new File(source);
File toFile = new File(target);
optimize(fromFile, toFile, quality);
}
/**
* 压缩图片
*
* @param source
* a {@link File} object.
* @param target
* a {@link File} object.
* @param quality
* 图片质量0-1之间
*/
public static final void optimize(File source, File target, float quality) throws Exception {
if (target.exists()) {
target.delete();
} else {
FileUtil.mkDir(target.getParent());
}
InputStream is = null;
OutputStream os = null;
try {
is = new BufferedInputStream(new FileInputStream(source));
os = new BufferedOutputStream(new FileOutputStream(target));
optimize(is, os, quality);
} catch (FileNotFoundException e) {
throw new Exception(e);
} finally {
IOUtils.closeQuietly(is);
IOUtils.closeQuietly(os);
}
}
/**
* 制作圆角
*
* @param srcFile
* 原文件
* @param destFile
* 目标文件
* @param cornerRadius
* 角度
*/
public static void makeRoundedCorner(File srcFile, File destFile, int cornerRadius) throws Exception {
InputStream in = null;
OutputStream out = null;
try {
in = new BufferedInputStream(new FileInputStream(srcFile));
FileUtil.mkDir(destFile.getParentFile().getAbsolutePath());
out = new BufferedOutputStream(new FileOutputStream(destFile));
makeRoundedCorner(in, out, cornerRadius);
} catch (IOException e) {
e.printStackTrace();
throw new Exception(e);
} finally {
IOUtils.closeQuietly(out);
IOUtils.closeQuietly(in);
}
}
/**
* 制作圆角
*
* @param srcFile
* 原文件
* @param destFile
* 目标文件
* @param cornerRadius
* 角度
*/
public static void makeRoundedCorner(String srcFile, String destFile, int cornerRadius) throws Exception {
makeRoundedCorner(new File(srcFile), new File(destFile), cornerRadius);
}
/**
* 制作圆角
*
* @param inputStream
* 原图输入流
* @param outputStream
* 目标输出流
* @param radius
* 角度
*/
public static void makeRoundedCorner(final InputStream inputStream,
final OutputStream outputStream, final int radius) throws Exception {
BufferedImage sourceImage = null;
BufferedImage targetImage = null;
try {
sourceImage = ImageIO.read(inputStream);
int w = sourceImage.getWidth();
int h = sourceImage.getHeight();
System.out.println(w);
int cornerRadius = radius < 1 ? w / 4 : radius;
targetImage = new BufferedImage(w, h, BufferedImage.TYPE_INT_ARGB);
Graphics2D g2 = targetImage.createGraphics();
// This is what we want, but it only does hard-clipping, i.e.
// aliasing
// g2.setClip(new RoundRectangle2D ...)
// so instead fake soft-clipping by first drawing the desired clip
// shape
// in fully opaque white with antialiasing enabled...
g2.setComposite(AlphaComposite.Src);
g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
g2.setColor(Color.WHITE);
g2.fill(new RoundRectangle2D.Float(0, 0, w, h, cornerRadius, cornerRadius));
// ... then compositing the image on top,
// using the white shape from above as alpha source
g2.setComposite(AlphaComposite.SrcAtop);
g2.drawImage(sourceImage, 0, 0, null);
g2.dispose();
ImageIO.write(targetImage, "png", outputStream);
} catch (IOException e) {
e.printStackTrace();
throw new Exception(e);
}
}
}
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