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com.xiaoleilu.hutool.util.ImageUtil Maven / Gradle / Ivy
package com.xiaoleilu.hutool.util;
import java.awt.AlphaComposite;
import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.Toolkit;
import java.awt.color.ColorSpace;
import java.awt.geom.AffineTransform;
import java.awt.image.AffineTransformOp;
import java.awt.image.BufferedImage;
import java.awt.image.ColorConvertOp;
import java.awt.image.CropImageFilter;
import java.awt.image.FilteredImageSource;
import java.awt.image.ImageFilter;
import java.io.File;
import java.io.IOException;
import javax.imageio.ImageIO;
import com.xiaoleilu.hutool.exceptions.UtilException;
import com.xiaoleilu.hutool.io.IORuntimeException;
/**
* 图片处理工具类：null
*/
public final static void scale(File srcImageFile, File destImageFile, int height, int width, Color fixedColor) {
try {
double ratio = 0.0; // 缩放比例
BufferedImage bi = ImageIO.read(srcImageFile);
Image itemp = bi.getScaledInstance(width, height, BufferedImage.SCALE_SMOOTH);
// 计算比例
if ((bi.getHeight() > height) || (bi.getWidth() > width)) {
if (bi.getHeight() > bi.getWidth()) {
ratio = (new Integer(height)).doubleValue() / bi.getHeight();
} else {
ratio = (new Integer(width)).doubleValue() / bi.getWidth();
}
AffineTransformOp op = new AffineTransformOp(AffineTransform.getScaleInstance(ratio, ratio), null);
itemp = op.filter(bi, null);
}
if (null != fixedColor) {// 补白
BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
Graphics2D g = image.createGraphics();
g.setColor(fixedColor);
g.fillRect(0, 0, width, height);
if (width == itemp.getWidth(null))
g.drawImage(itemp, 0, (height - itemp.getHeight(null)) / 2, itemp.getWidth(null), itemp.getHeight(null), fixedColor, null);
else
g.drawImage(itemp, (width - itemp.getWidth(null)) / 2, 0, itemp.getWidth(null), itemp.getHeight(null), fixedColor, null);
g.dispose();
itemp = image;
}
ImageIO.write((BufferedImage) itemp, IMAGE_TYPE_JPEG, destImageFile);
} catch (IOException e) {
throw new IORuntimeException(e);
}
}
/**
* 图像切割(按指定起点坐标和宽高切割)
*
* @param srcImageFile 源图像地址
* @param destImageFile 切片后的图像地址
* @param x 目标切片起点坐标X
* @param y 目标切片起点坐标Y
* @param width 目标切片宽度
* @param height 目标切片高度
*/
public final static void cut(File srcImageFile, File destImageFile, int x, int y, int width, int height) {
try {
// 读取源图像
BufferedImage bi = ImageIO.read(srcImageFile);
int srcWidth = bi.getHeight(); // 源图宽度
int srcHeight = bi.getWidth(); // 源图高度
if (srcWidth > 0 && srcHeight > 0) {
Image image = bi.getScaledInstance(srcWidth, srcHeight, Image.SCALE_DEFAULT);
// 四个参数分别为图像起点坐标和宽高
// 即: CropImageFilter(int x,int y,int width,int height)
ImageFilter cropFilter = new CropImageFilter(x, y, width, height);
Image img = Toolkit.getDefaultToolkit().createImage(new FilteredImageSource(image.getSource(), cropFilter));
BufferedImage tag = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
Graphics g = tag.getGraphics();
g.drawImage(img, 0, 0, width, height, null); // 绘制切割后的图
g.dispose();
// 输出为文件
ImageIO.write(tag, IMAGE_TYPE_JPEG, destImageFile);
}
} catch (Exception e) {
throw new UtilException(e);
}
}
/**
* 图像切割（指定切片的行数和列数）
*
* @param srcImageFile 源图像地址
* @param descDir 切片目标文件夹
* @param rows 目标切片行数。默认2，必须是范围 [1, 20] 之内
* @param cols 目标切片列数。默认2，必须是范围 [1, 20] 之内
*/
public final static void cutByRowsAndCols(File srcImageFile, File descDir, int rows, int cols) {
try {
if (rows <= 0 || rows > 20) rows = 2; // 切片行数
if (cols <= 0 || cols > 20) cols = 2; // 切片列数
// 读取源图像
BufferedImage bi = ImageIO.read(srcImageFile);
int srcWidth = bi.getHeight(); // 源图宽度
int srcHeight = bi.getWidth(); // 源图高度
if (srcWidth > 0 && srcHeight > 0) {
Image img;
ImageFilter cropFilter;
Image image = bi.getScaledInstance(srcWidth, srcHeight, Image.SCALE_DEFAULT);
int destWidth = srcWidth; // 每张切片的宽度
int destHeight = srcHeight; // 每张切片的高度
// 计算切片的宽度和高度
if (srcWidth % cols == 0) {
destWidth = srcWidth / cols;
} else {
destWidth = (int) Math.floor(srcWidth / cols) + 1;
}
if (srcHeight % rows == 0) {
destHeight = srcHeight / rows;
} else {
destHeight = (int) Math.floor(srcWidth / rows) + 1;
}
// 循环建立切片
// 改进的想法:是否可用多线程加快切割速度
for (int i = 0; i < rows; i++) {
for (int j = 0; j < cols; j++) {
// 四个参数分别为图像起点坐标和宽高
// 即: CropImageFilter(int x,int y,int width,int height)
cropFilter = new CropImageFilter(j * destWidth, i * destHeight, destWidth, destHeight);
img = Toolkit.getDefaultToolkit().createImage(new FilteredImageSource(image.getSource(), cropFilter));
BufferedImage tag = new BufferedImage(destWidth, destHeight, BufferedImage.TYPE_INT_RGB);
Graphics g = tag.getGraphics();
g.drawImage(img, 0, 0, null); // 绘制缩小后的图
g.dispose();
// 输出为文件
ImageIO.write(tag, IMAGE_TYPE_JPEG, new File(descDir, "_r" + i + "_c" + j + ".jpg"));
}
}
}
} catch (Exception e) {
throw new UtilException(e);
}
}
/**
* 图像切割（指定切片的宽度和高度）
*
* @param srcImageFile 源图像地址
* @param descDir 切片目标文件夹
* @param destWidth 目标切片宽度。默认200
* @param destHeight 目标切片高度。默认150
*/
public final static void cut(File srcImageFile, File descDir, int destWidth, int destHeight) {
try {
if (destWidth <= 0) destWidth = 200; // 切片宽度
if (destHeight <= 0) destHeight = 150; // 切片高度
// 读取源图像
BufferedImage bi = ImageIO.read(srcImageFile);
int srcWidth = bi.getHeight(); // 源图宽度
int srcHeight = bi.getWidth(); // 源图高度
if (srcWidth > destWidth && srcHeight > destHeight) {
Image img;
ImageFilter cropFilter;
Image image = bi.getScaledInstance(srcWidth, srcHeight, Image.SCALE_DEFAULT);
int cols = 0; // 切片横向数量
int rows = 0; // 切片纵向数量
// 计算切片的横向和纵向数量
if (srcWidth % destWidth == 0) {
cols = srcWidth / destWidth;
} else {
cols = (int) Math.floor(srcWidth / destWidth) + 1;
}
if (srcHeight % destHeight == 0) {
rows = srcHeight / destHeight;
} else {
rows = (int) Math.floor(srcHeight / destHeight) + 1;
}
// 循环建立切片
// 改进的想法:是否可用多线程加快切割速度
for (int i = 0; i < rows; i++) {
for (int j = 0; j < cols; j++) {
// 四个参数分别为图像起点坐标和宽高
// 即: CropImageFilter(int x,int y,int width,int height)
cropFilter = new CropImageFilter(j * destWidth, i * destHeight, destWidth, destHeight);
img = Toolkit.getDefaultToolkit().createImage(new FilteredImageSource(image.getSource(), cropFilter));
BufferedImage tag = new BufferedImage(destWidth, destHeight, BufferedImage.TYPE_INT_RGB);
Graphics g = tag.getGraphics();
g.drawImage(img, 0, 0, null); // 绘制缩小后的图
g.dispose();
// 输出为文件
ImageIO.write(tag, "JPEG", new File(descDir, "_r" + i + "_c" + j + ".jpg"));
}
}
}
} catch (IOException e) {
throw new IORuntimeException(e);
}
}
/**
* 图像类型转换：GIF=》JPG、GIF=》PNG、PNG=》JPG、PNG=》GIF(X)、BMP=》PNG
*
* @param srcImageFile 源图像文件
* @param formatName 包含格式非正式名称的 String：如JPG、JPEG、GIF等
* @param destImageFile 目标图像文件
*/
public final static void convert(File srcImageFile, String formatName, File destImageFile) {
try {
BufferedImage src = ImageIO.read(srcImageFile);
ImageIO.write(src, formatName, destImageFile);
} catch (IOException e) {
throw new IORuntimeException(e);
}
}
/**
* 彩色转为黑白
*
* @param srcImageFile 源图像地址
* @param destImageFile 目标图像地址
*/
public final static void gray(File srcImageFile, File destImageFile) {
try {
BufferedImage src = ImageIO.read(srcImageFile);
ColorSpace cs = ColorSpace.getInstance(ColorSpace.CS_GRAY);
ColorConvertOp op = new ColorConvertOp(cs, null);
src = op.filter(src, null);
ImageIO.write(src, IMAGE_TYPE_JPEG,destImageFile);
} catch (IOException e) {
throw new IORuntimeException(e);
}
}
/**
* 给图片添加文字水印
*
* @param pressText 水印文字
* @param srcImageFile 源图像地址
* @param destImageFile 目标图像地址
* @param fontName 水印的字体名称
* @param fontStyle 水印的字体样式，例如Font.BOLD
* @param color 水印的字体颜色
* @param fontSize 水印的字体大小
* @param x 修正值
* @param y 修正值
* @param alpha 透明度：alpha 必须是范围 [0.0, 1.0] 之内（包含边界值）的一个浮点数字
*/
public final static void pressText(String pressText, File srcImageFile, File destImageFile, String fontName, int fontStyle, Color color, int fontSize, int x, int y, float alpha) {
try {
Image src = ImageIO.read(srcImageFile);
int width = src.getWidth(null);
int height = src.getHeight(null);
BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
Graphics2D g = image.createGraphics();
g.drawImage(src, 0, 0, width, height, null);
g.setColor(color);
g.setFont(new Font(fontName, fontStyle, fontSize));
g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_ATOP, alpha));
// 在指定坐标绘制水印文字
g.drawString(pressText, (width - (getLength(pressText) * fontSize)) / 2 + x, (height - fontSize) / 2 + y);
g.dispose();
ImageIO.write((BufferedImage) image, IMAGE_TYPE_JPEG, destImageFile);// 输出到文件流
} catch (IOException e) {
throw new IORuntimeException(e);
}
}
/**
* 给图片添加图片水印
*
* @param pressImgFile 水印图片
* @param srcImageFile 源图像文件
* @param destImageFile 目标图像文件
* @param x 修正值。 默认在中间，偏移量相对于中间偏移
* @param y 修正值。 默认在中间，偏移量相对于中间偏移
* @param alpha 透明度：alpha 必须是范围 [0.0, 1.0] 之内（包含边界值）的一个浮点数字
*/
public final static void pressImage(File pressImgFile, File srcImageFile, File destImageFile, int x, int y, float alpha) {
try {
Image src = ImageIO.read(srcImageFile);
int width = src.getWidth(null);
int height = src.getHeight(null);
BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
Graphics2D g = image.createGraphics();
g.drawImage(src, 0, 0, width, height, null);
// 水印文件
Image pressImg = ImageIO.read(pressImgFile);
int pressImgWidth = pressImg.getWidth(null);
int pressImgHeight = pressImg.getHeight(null);
x += (width - pressImgWidth) / 2;
y += (height - pressImgHeight) / 2;
g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_ATOP, alpha));
g.drawImage(pressImg, x, y, pressImgWidth, pressImgHeight, null);
// 水印文件结束
g.dispose();
ImageIO.write((BufferedImage) image, "JPEG", destImageFile);
} catch (IOException e) {
throw new IORuntimeException(e);
}
}
//---------------------------------------------------------------------------------------------------------------- Private method start
/**
* 计算text的长度（一个中文算两个字符）
*
* @param text 文本
* @return 字符长度，如：text="中国",返回 2；text="test",返回 2；text="中国ABC",返回 4.
*/
private final static int getLength(String text) {
int length = 0;
for (int i = 0; i < text.length(); i++) {
if (new String(text.charAt(i) + "").getBytes().length > 1) {
length += 2;
} else {
length += 1;
}
}
return length / 2;
}
//---------------------------------------------------------------------------------------------------------------- Private method end
}
