/*
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* Copyright (c) 2018-2028, Chill Zhuang All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* Neither the name of the dreamlu.net developer nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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* Author: Chill 庄骞 (smallchill@163.com)
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*/
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package org.springblade.core.tool.utils;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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import org.springblade.core.tool.support.IMultiOutputStream;
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import org.springblade.core.tool.support.ImagePosition;
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import javax.imageio.ImageIO;
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import java.awt.*;
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import java.awt.color.ColorSpace;
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import java.awt.geom.AffineTransform;
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import java.awt.image.*;
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import java.io.*;
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import java.net.URL;
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/**
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* 图片工具类
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*
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* @author Chill
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*/
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public final class ImageUtil {
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/**
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* Logger for this class
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*/
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private static Logger LOGGER = LoggerFactory.getLogger(ImageUtil.class);
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/**
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* 默认输出图片类型
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*/
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public static final String DEFAULT_IMG_TYPE = "JPEG";
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private ImageUtil() {
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}
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/**
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* 转换输入流到byte
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*
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* @param src 源
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* @param type 类型
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* @return byte[]
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* @throws IOException 异常
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*/
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public static byte[] toByteArray(BufferedImage src, String type) throws IOException {
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ByteArrayOutputStream os = new ByteArrayOutputStream();
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ImageIO.write(src, defaultString(type, DEFAULT_IMG_TYPE), os);
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return os.toByteArray();
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}
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/**
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* 获取图像内容
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*
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* @param srcImageFile 文件路径
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* @return BufferedImage
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*/
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public static BufferedImage readImage(String srcImageFile) {
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try {
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return ImageIO.read(new File(srcImageFile));
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} catch (IOException e) {
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LOGGER.error("Error readImage", e);
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}
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return null;
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}
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/**
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* 获取图像内容
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*
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* @param srcImageFile 文件
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* @return BufferedImage
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*/
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public static BufferedImage readImage(File srcImageFile) {
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try {
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return ImageIO.read(srcImageFile);
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} catch (IOException e) {
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LOGGER.error("Error readImage", e);
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}
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return null;
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}
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/**
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* 获取图像内容
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*
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* @param srcInputStream 输入流
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* @return BufferedImage
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*/
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public static BufferedImage readImage(InputStream srcInputStream) {
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try {
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return ImageIO.read(srcInputStream);
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} catch (IOException e) {
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LOGGER.error("Error readImage", e);
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}
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return null;
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}
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/**
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* 获取图像内容
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*
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* @param url URL地址
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* @return BufferedImage
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*/
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public static BufferedImage readImage(URL url) {
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try {
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return ImageIO.read(url);
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} catch (IOException e) {
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LOGGER.error("Error readImage", e);
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}
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return null;
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}
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/**
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* 缩放图像（按比例缩放）
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*
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* @param src 源图像
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* @param output 输出流
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* @param type 类型
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* @param scale 缩放比例
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* @param flag 缩放选择:true 放大; false 缩小;
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*/
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public final static void zoomScale(BufferedImage src, OutputStream output, String type, double scale, boolean flag) {
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try {
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// 得到源图宽
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int width = src.getWidth();
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// 得到源图长
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int height = src.getHeight();
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if (flag) {
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// 放大
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width = Long.valueOf(Math.round(width * scale)).intValue();
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height = Long.valueOf(Math.round(height * scale)).intValue();
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} else {
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// 缩小
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width = Long.valueOf(Math.round(width / scale)).intValue();
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height = Long.valueOf(Math.round(height / scale)).intValue();
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}
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Image image = src.getScaledInstance(width, height, Image.SCALE_DEFAULT);
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BufferedImage tag = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
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Graphics g = tag.getGraphics();
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g.drawImage(image, 0, 0, null);
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g.dispose();
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ImageIO.write(tag, defaultString(type, DEFAULT_IMG_TYPE), output);
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output.close();
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} catch (IOException e) {
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LOGGER.error("Error in zoom image", e);
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}
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}
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/**
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* 缩放图像（按高度和宽度缩放）
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*
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* @param src 源图像
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* @param output 输出流
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* @param type 类型
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* @param height 缩放后的高度
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* @param width 缩放后的宽度
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* @param bb 比例不对时是否需要补白：true为补白; false为不补白;
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* @param fillColor 填充色，null时为Color.WHITE
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*/
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public final static void zoomFixed(BufferedImage src, OutputStream output, String type, int height, int width, boolean bb, Color fillColor) {
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try {
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double ratio = 0.0;
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Image itemp = src.getScaledInstance(width, height, BufferedImage.SCALE_SMOOTH);
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// 计算比例
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if (src.getHeight() > src.getWidth()) {
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ratio = Integer.valueOf(height).doubleValue() / src.getHeight();
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} else {
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ratio = Integer.valueOf(width).doubleValue() / src.getWidth();
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}
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AffineTransformOp op = new AffineTransformOp(AffineTransform.getScaleInstance(ratio, ratio), null);
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itemp = op.filter(src, null);
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if (bb) {
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//补白
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BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
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Graphics2D g = image.createGraphics();
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Color fill = fillColor == null ? Color.white : fillColor;
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g.setColor(fill);
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g.fillRect(0, 0, width, height);
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if (width == itemp.getWidth(null)) {
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g.drawImage(itemp, 0, (height - itemp.getHeight(null)) / 2, itemp.getWidth(null), itemp.getHeight(null), fill, null);
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} else {
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g.drawImage(itemp, (width - itemp.getWidth(null)) / 2, 0, itemp.getWidth(null), itemp.getHeight(null), fill, null);
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}
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g.dispose();
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itemp = image;
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}
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// 输出为文件
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ImageIO.write((BufferedImage) itemp, defaultString(type, DEFAULT_IMG_TYPE), output);
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// 关闭流
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output.close();
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} catch (IOException e) {
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LOGGER.error("Error in zoom image", e);
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}
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}
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/**
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* 图像裁剪(按指定起点坐标和宽高切割)
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*
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* @param src 源图像
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* @param output 切片后的图像地址
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* @param type 类型
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* @param x 目标切片起点坐标X
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* @param y 目标切片起点坐标Y
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* @param width 目标切片宽度
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* @param height 目标切片高度
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*/
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public final static void crop(BufferedImage src, OutputStream output, String type, int x, int y, int width, int height) {
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try {
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// 源图宽度
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int srcWidth = src.getWidth();
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// 源图高度
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int srcHeight = src.getHeight();
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if (srcWidth > 0 && srcHeight > 0) {
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Image image = src.getScaledInstance(srcWidth, srcHeight, Image.SCALE_DEFAULT);
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// 四个参数分别为图像起点坐标和宽高
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ImageFilter cropFilter = new CropImageFilter(x, y, width, height);
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Image img = Toolkit.getDefaultToolkit().createImage(new FilteredImageSource(image.getSource(), cropFilter));
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BufferedImage tag = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
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Graphics g = tag.getGraphics();
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g.drawImage(img, 0, 0, width, height, null);
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g.dispose();
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// 输出为文件
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ImageIO.write(tag, defaultString(type, DEFAULT_IMG_TYPE), output);
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// 关闭流
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output.close();
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}
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} catch (Exception e) {
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LOGGER.error("Error in cut image", e);
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}
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}
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/**
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* 图像切割（指定切片的行数和列数）
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*
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* @param src 源图像地址
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* @param mos 切片目标文件夹
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* @param type 类型
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* @param prows 目标切片行数。默认2，必须是范围 [1, 20] 之内
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* @param pcols 目标切片列数。默认2，必须是范围 [1, 20] 之内
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*/
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public final static void sliceWithNumber(BufferedImage src, IMultiOutputStream mos, String type, int prows, int pcols) {
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try {
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int rows = prows <= 0 || prows > 20 ? 2 : prows;
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int cols = pcols <= 0 || pcols > 20 ? 2 : pcols;
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// 源图宽度
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int srcWidth = src.getWidth();
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// 源图高度
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int srcHeight = src.getHeight();
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if (srcWidth > 0 && srcHeight > 0) {
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Image img;
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ImageFilter cropFilter;
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Image image = src.getScaledInstance(srcWidth, srcHeight, Image.SCALE_DEFAULT);
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// 每张切片的宽度
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int destWidth = (srcWidth % cols == 0) ? (srcWidth / cols) : (srcWidth / cols + 1);
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// 每张切片的高度
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int destHeight = (srcHeight % rows == 0) ? (srcHeight / rows) : (srcHeight / rows + 1);
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// 循环建立切片
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// 改进的想法:是否可用多线程加快切割速度
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for (int i = 0; i < rows; i++) {
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for (int j = 0; j < cols; j++) {
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// 四个参数分别为图像起点坐标和宽高
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cropFilter = new CropImageFilter(j * destWidth, i * destHeight, destWidth, destHeight);
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img = Toolkit.getDefaultToolkit().createImage(new FilteredImageSource(image.getSource(), cropFilter));
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BufferedImage tag = new BufferedImage(destWidth, destHeight, BufferedImage.TYPE_INT_RGB);
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Graphics g = tag.getGraphics();
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// 绘制缩小后的图
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g.drawImage(img, 0, 0, null);
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g.dispose();
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// 输出为文件
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ImageIO.write(tag, defaultString(type, DEFAULT_IMG_TYPE), mos.buildOutputStream(i, j));
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}
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}
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}
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} catch (Exception e) {
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LOGGER.error("Error in slice image", e);
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}
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}
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/**
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* 图像切割（指定切片的宽度和高度）
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*
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* @param src 源图像地址
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* @param mos 切片目标文件夹
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* @param type 类型
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* @param pdestWidth 目标切片宽度。默认200
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* @param pdestHeight 目标切片高度。默认150
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*/
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public final static void sliceWithSize(BufferedImage src, IMultiOutputStream mos, String type, int pdestWidth, int pdestHeight) {
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try {
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int destWidth = pdestWidth <= 0 ? 200 : pdestWidth;
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int destHeight = pdestHeight <= 0 ? 150 : pdestHeight;
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// 源图宽度
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int srcWidth = src.getWidth();
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// 源图高度
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int srcHeight = src.getHeight();
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if (srcWidth > destWidth && srcHeight > destHeight) {
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Image img;
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ImageFilter cropFilter;
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Image image = src.getScaledInstance(srcWidth, srcHeight, Image.SCALE_DEFAULT);
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// 切片横向数量
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int cols = (srcWidth % destWidth == 0) ? (srcWidth / destWidth) : (srcWidth / destWidth + 1);
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// 切片纵向数量
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int rows = (srcHeight % destHeight == 0) ? (srcHeight / destHeight) : (srcHeight / destHeight + 1);
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// 循环建立切片
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// 改进的想法:是否可用多线程加快切割速度
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for (int i = 0; i < rows; i++) {
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for (int j = 0; j < cols; j++) {
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// 四个参数分别为图像起点坐标和宽高
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cropFilter = new CropImageFilter(j * destWidth, i * destHeight, destWidth, destHeight);
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img = Toolkit.getDefaultToolkit().createImage(new FilteredImageSource(image.getSource(), cropFilter));
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BufferedImage tag = new BufferedImage(destWidth, destHeight, BufferedImage.TYPE_INT_RGB);
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Graphics g = tag.getGraphics();
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// 绘制缩小后的图
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g.drawImage(img, 0, 0, null);
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g.dispose();
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// 输出为文件
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ImageIO.write(tag, defaultString(type, DEFAULT_IMG_TYPE), mos.buildOutputStream(i, j));
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}
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}
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}
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} catch (Exception e) {
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LOGGER.error("Error in slice image", e);
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}
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}
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/**
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* 图像类型转换：GIF-JPG、GIF-PNG、PNG-JPG、PNG-GIF(X)、BMP-PNG
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*
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* @param src 源图像地址
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* @param formatName 包含格式非正式名称的 String：如JPG、JPEG、GIF等
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* @param output 目标图像地址
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*/
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public final static void convert(BufferedImage src, OutputStream output, String formatName) {
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try {
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// 输出为文件
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ImageIO.write(src, formatName, output);
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// 关闭流
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output.close();
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} catch (Exception e) {
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LOGGER.error("Error in convert image", e);
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}
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}
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/**
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* 彩色转为黑白
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*
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* @param src 源图像地址
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* @param output 目标图像地址
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* @param type 类型
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*/
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public final static void gray(BufferedImage src, OutputStream output, String type) {
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try {
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ColorSpace cs = ColorSpace.getInstance(ColorSpace.CS_GRAY);
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ColorConvertOp op = new ColorConvertOp(cs, null);
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src = op.filter(src, null);
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// 输出为文件
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ImageIO.write(src, defaultString(type, DEFAULT_IMG_TYPE), output);
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// 关闭流
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output.close();
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} catch (IOException e) {
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LOGGER.error("Error in gray image", e);
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}
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}
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/**
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* 给图片添加文字水印
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*
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* @param src 源图像
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* @param output 输出流
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* @param type 类型
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* @param text 水印文字
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* @param font 水印的字体
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* @param color 水印的字体颜色
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* @param position 水印位置 {@link ImagePosition}
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* @param x 修正值
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* @param y 修正值
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* @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
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*/
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public final static void textStamp(BufferedImage src, OutputStream output, String type, String text, Font font, Color color
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, int position, int x, int y, float alpha) {
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try {
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int width = src.getWidth(null);
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int height = src.getHeight(null);
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BufferedImage image = new BufferedImage(width, height,
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BufferedImage.TYPE_INT_RGB);
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Graphics2D g = image.createGraphics();
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g.drawImage(src, 0, 0, width, height, null);
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g.setColor(color);
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g.setFont(font);
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g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_ATOP, alpha));
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// 在指定坐标绘制水印文字
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ImagePosition boxPos = new ImagePosition(width, height, calcTextWidth(text) * font.getSize(), font.getSize(), position);
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g.drawString(text, boxPos.getX(x), boxPos.getY(y));
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g.dispose();
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// 输出为文件
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ImageIO.write((BufferedImage) image, defaultString(type, DEFAULT_IMG_TYPE), output);
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// 关闭流
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output.close();
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} catch (Exception e) {
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LOGGER.error("Error in textStamp image", e);
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}
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}
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/**
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* 给图片添加图片水印
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*
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* @param src 源图像
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* @param output 输出流
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* @param type 类型
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* @param stamp 水印图片
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* @param position 水印位置 {@link ImagePosition}
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* @param x 修正值
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* @param y 修正值
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* @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
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*/
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public final static void imageStamp(BufferedImage src, OutputStream output, String type, BufferedImage stamp
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, int position, int x, int y, float alpha) {
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try {
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int width = src.getWidth();
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int height = src.getHeight();
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BufferedImage image = new BufferedImage(width, height,
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BufferedImage.TYPE_INT_RGB);
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Graphics2D g = image.createGraphics();
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g.drawImage(src, 0, 0, width, height, null);
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// 水印文件
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int stampWidth = stamp.getWidth();
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int stampHeight = stamp.getHeight();
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g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_ATOP, alpha));
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ImagePosition boxPos = new ImagePosition(width, height, stampWidth, stampHeight, position);
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g.drawImage(stamp, boxPos.getX(x), boxPos.getY(y), stampWidth, stampHeight, null);
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// 水印文件结束
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g.dispose();
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// 输出为文件
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ImageIO.write((BufferedImage) image, defaultString(type, DEFAULT_IMG_TYPE), output);
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// 关闭流
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output.close();
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} catch (Exception e) {
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LOGGER.error("Error imageStamp", e);
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}
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}
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/**
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* 计算text的长度（一个中文算两个字符）
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*
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* @param text text
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* @return int
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*/
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public final static int calcTextWidth(String text) {
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int length = 0;
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for (int i = 0; i < text.length(); i++) {
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if (new String(text.charAt(i) + "").getBytes().length > 1) {
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length += 2;
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} else {
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length += 1;
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}
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}
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return length / 2;
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}
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/**
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* 默认字符串
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* @param str 字符串
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* @param defaultStr 默认值
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* @return
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*/
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public static String defaultString(String str, String defaultStr) {
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return ((str == null) ? defaultStr : str);
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}
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}
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