java 图片image工具类，ImageUtil.java

1.java 图片image工具类，ImageUtil.java

package com.broadway.numpeople.utils;import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.Toolkit;
import java.awt.Transparency;
import java.awt.geom.AffineTransform;
import java.awt.image.AffineTransformOp;
import java.awt.image.BufferedImage;
import java.awt.image.CropImageFilter;
import java.awt.image.FilteredImageSource;
import java.awt.image.ImageFilter;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.util.Date;
import javax.imageio.ImageIO;public class ImageUtil {/*** 裁剪PNG图片工具类* * @param fromFile*            源文件* @param toFile*            裁剪后的文件* @param outputWidth*            裁剪宽度* @param outputHeight*            裁剪高度* @param proportion*            是否是等比缩放*/public static void resizePng(File fromFile, File toFile, int outputWidth, int outputHeight,boolean proportion) {try {BufferedImage bi2 = ImageIO.read(fromFile);int newWidth;int newHeight;// 判断是否是等比缩放if (proportion) {// 为等比缩放计算输出的图片宽度及高度double rate1 = ((double) bi2.getWidth(null)) / (double) outputWidth + 0.1;double rate2 = ((double) bi2.getHeight(null)) / (double) outputHeight + 0.1;// 根据缩放比率大的进行缩放控制double rate = rate1 < rate2 ? rate1 : rate2;newWidth = (int) (((double) bi2.getWidth(null)) / rate);newHeight = (int) (((double) bi2.getHeight(null)) / rate);} else {newWidth = outputWidth; // 输出的图片宽度newHeight = outputHeight; // 输出的图片高度}BufferedImage to = new BufferedImage(newWidth, newHeight, BufferedImage.TYPE_INT_RGB);Graphics2D g2d = to.createGraphics();to = g2d.getDeviceConfiguration().createCompatibleImage(newWidth, newHeight,Transparency.TRANSLUCENT);g2d.dispose();g2d = to.createGraphics();@SuppressWarnings("static-access")Image from = bi2.getScaledInstance(newWidth, newHeight, bi2.SCALE_AREA_AVERAGING);g2d.drawImage(from, 0, 0, null);g2d.dispose();ImageIO.write(to, "png", toFile);} catch (Exception e) {e.printStackTrace();}}//图片切割  四个参数分别为图像起点坐标和宽高public static BufferedImage cutImage(BufferedImage bi, int start_width,int start_height,int outputWidth, int outputHeight){try{// 源图宽度int srcWidth = bi.getWidth();// 源图高度int srcHeight = bi.getHeight();int destHeight = outputHeight;int destWidth = outputWidth;Image image = bi.getScaledInstance(srcWidth, srcHeight, Image.SCALE_DEFAULT);Image img;ImageFilter cropFilter;// 四个参数分别为图像起点坐标和宽高cropFilter = new CropImageFilter(start_width, start_height,destWidth, destHeight);img = Toolkit.getDefaultToolkit().createImage(new FilteredImageSource(image.getSource(), cropFilter));BufferedImage tag = new BufferedImage(destWidth, destHeight,BufferedImage.TYPE_INT_RGB);Graphics2D g2d = tag.createGraphics();tag = g2d.getDeviceConfiguration().createCompatibleImage(destWidth, destHeight,Transparency.TRANSLUCENT);g2d.dispose();g2d = tag.createGraphics();
//          @SuppressWarnings("static-access")
//          Image from = bi.getScaledInstance(destWidth, destHeight, bi.SCALE_AREA_AVERAGING);g2d.drawImage(img, 0, 0, null);g2d.dispose();//          Graphics g = tag.getGraphics();
//          g.drawImage(img, 0, 0, null); // 绘制缩小后的图
//          g.dispose();return tag;}catch (Exception e){e.printStackTrace();}return null;}/**按照参数的宽高，拉伸图片* * fromFile:源图片* saveFile:保存的新图片* * */public static void ratioByWidthHeightImage(File fromFile, File saveFile, int width_bg, int height_bg) {try {BufferedImage image = ImageIO.read(fromFile);BufferedImage imageNew = new BufferedImage(width_bg,height_bg,BufferedImage.TYPE_INT_RGB);imageNew.getGraphics().drawImage(image.getScaledInstance(width_bg, height_bg, Image.SCALE_SMOOTH), 0, 0, null); // 绘制缩小后的图ImageIO.write(imageNew, "PNG", saveFile);} catch (Exception e) {e.printStackTrace();}}/*** 旋转图片* @param image* @param degree:旋转角度* @param bgcolor：背景颜色 可为null* @return*/public static BufferedImage rotateImg(BufferedImage image, int degree, Color bgcolor) {BufferedImage return_bi = null;try {int iw = image.getWidth();//原始图象的宽度int ih = image.getHeight();//原始图象的高度int w = 0;int h = 0;int x = 0;int y = 0;degree = degree % 360;if (degree < 0)degree = 360 + degree;//将角度转换到0-360度之间double ang = Math.toRadians(degree);//将角度转为弧度/***确定旋转后的图象的高度和宽度*/if (degree == 180 || degree == 0 || degree == 360) {w = iw;h = ih;} else if (degree == 90 || degree == 270) {w = ih;h = iw;} else {int d = iw + ih;w = (int) (d * Math.abs(Math.cos(ang)));h = (int) (d * Math.abs(Math.sin(ang)));}x = (w / 2) - (iw / 2);//确定原点坐标y = (h / 2) - (ih / 2);BufferedImage rotatedImage = new BufferedImage(w, h, image.getType());Graphics2D gs = (Graphics2D) rotatedImage.getGraphics();if (bgcolor == null) {rotatedImage = gs.getDeviceConfiguration().createCompatibleImage(w, h, Transparency.TRANSLUCENT);} else {gs.setColor(bgcolor);gs.fillRect(0, 0, w, h);//以给定颜色绘制旋转后图片的背景}AffineTransform at = new AffineTransform();at.rotate(ang, w / 2, h / 2);//旋转图象at.translate(x, y);AffineTransformOp op = new AffineTransformOp(at, AffineTransformOp.TYPE_BICUBIC);op.filter(image, rotatedImage);return_bi = rotatedImage;
//          image = rotatedImage;
//
//          ByteArrayOutputStream byteOut = new ByteArrayOutputStream();
//          ImageOutputStream imageOut = ImageIO.createImageOutputStream(byteOut);
//          ImageIO.write(image, "png", imageOut);
//          return new ByteArrayInputStream(byteOut.toByteArray());} catch (Exception e) {e.printStackTrace();}   return return_bi;}/*** 设置背景色* @param image* @param color：背景颜色 可为null* @return*/public static BufferedImage setBgColor(BufferedImage srcImage, Color color) {BufferedImage return_bi = null;try {int w = srcImage.getWidth();//原始图象的宽度int h = srcImage.getHeight();//原始图象的高度return_bi = new BufferedImage(w, h, BufferedImage.TYPE_INT_RGB);Graphics2D gs = (Graphics2D) return_bi.getGraphics();// 设置背景颜色
//          gs.setBackground(Color.WHITE);gs.setBackground(color);gs.clearRect(0, 0, w, h);// 设置图片居中显示gs.drawImage(srcImage, 0, 0, null);gs.dispose();} catch (Exception e) {e.printStackTrace();}   return return_bi;}/**合并图片 - 水平合并* 注意：水平合并时，需要注意两张图片的高度要一致* bi:源图片* bi2:源图片2* */public static BufferedImage mergeImage_x(BufferedImage bi, BufferedImage bi2) {try {// 源图宽/高int w1 = bi.getWidth();int h1 = bi.getHeight();// 源2图宽/高int w2 = bi2.getWidth();
//          int h2 = bi2.getHeight();int destWidth = w1 + w2;int destHeight = h1;// 生成新图片BufferedImage destImage = new BufferedImage(w1 + w2, h1, BufferedImage.TYPE_INT_RGB);Graphics2D g2d = destImage.createGraphics();destImage = g2d.getDeviceConfiguration().createCompatibleImage(destWidth, destHeight,Transparency.TRANSLUCENT);g2d.dispose();g2d = destImage.createGraphics();g2d.drawImage(bi, 0, 0, w1, h1, null);g2d.drawImage(bi2, w1, 0, w2, h1, null);g2d.dispose();return destImage;  } catch (Exception e) {e.printStackTrace();}return bi;}/**合并图片 * * bi:源图片* bi2:源图片2* bi2图片压bi的图片* */public static BufferedImage mergeImage(BufferedImage bi, BufferedImage bi2) {try {// 源图宽度int w = bi.getWidth();// 源图高度int h = bi.getHeight();Graphics g = bi.getGraphics();g.drawImage(bi2, 0, 0, w, h, null);  g.dispose();  } catch (Exception e) {e.printStackTrace();}return bi;}//文件的复制public static void imageCopy(String srcFile,String destFile){try {//创建文件输入流对象读取指定目录下的文件FileInputStream in=new FileInputStream(srcFile);//创建文件输出流对象读取指定目录下的文件FileOutputStream out=new FileOutputStream(destFile);byte[] buffer = new byte[1024]; //定义一个int类型的变量lengthint length=0;//获取文件拷贝的时间
//              long beginTime=System.currentTimeMillis();//通过循环将读取到的文件字节信息写入到新文件while((length=in.read(buffer)) > 0) {out.write(buffer,0,length);}
//              //获取拷贝后的时间
//              long endTime=System.currentTimeMillis();
//              //输出拷贝花费的时间
//              System.out.println("花费时间为："+(endTime-beginTime)+"毫秒");//关闭流in.close();out.close();} catch (Exception e) {e.printStackTrace();}}/*** 测试*/public static void main(String[] args) throws Exception {Date date = new Date();
//      File fromFile = new File("c:/1.png");
//      File toFile = new File("c:/2.png");
//      resizePng(fromFile, toFile, 100, 100, false);//旋转图片
//      File srcImage = new File("D:/2023/2023-03/test.png");
//      BufferedImage image = ImageIO.read(srcImage);
//      int degree = 90;//旋转角度
//      BufferedImage rotateImg = rotateImg(image,degree, null);
//      String result_file_name = "D:/2023/2023-03/test_2.png";
//      // 输出为文件
//      ImageIO.write(rotateImg, "png", new File(result_file_name));//合并图片
//      File srcImage = new File("D:/2023/2023-03/test_merge1.png");
//      BufferedImage bi1 = ImageIO.read(srcImage);
//      File srcImage2 = new File("D:/2023/2023-03/test_merge2.png");
//      BufferedImage bi2 = ImageIO.read(srcImage2);
//      BufferedImage result_bi = mergeImage( bi1, bi2);
//      String result_file_name = "D:/2023/2023-03/test_merge_result.png";
//      // 输出为文件
//      ImageIO.write(result_bi, "png", new File(result_file_name));//文件的复制//imageCopy("D:/2023/2023-03/test_merge1.png","D:/2023/2023-03/test_merge1_copy.png");//设置背景色File srcImage = new File("D:/2023/2023-03/test.png");BufferedImage bi1 = ImageIO.read(srcImage);BufferedImage result_bi = setBgColor(bi1, Color.green);String result_file_name = "D:/2023/2023-03/test_bg_result.png";// 输出为文件ImageIO.write(result_bi, "png", new File(result_file_name));System.out.println("花费："+(new Date().getTime() - date.getTime()));}
}

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