基于spring boot+mybatis的个人博客（前端+后台管理系统）.zip

package com.eumji.zblog.util; import javax.imageio.ImageIO; import java.awt.*; import java.awt.color.ColorSpace; import java.awt.image.*; import java.io.File; import java.io.IOException; import java.io.InputStream; /** * Created by eumji on 17-5-31. */ public class ImageCutUtil { /** * 图像切割（改） * * * @param srcImageFile 源图像地址 * @param dirImageFile 新图像地址 * @param x 目标切片起点x坐标 * @param y 目标切片起点y坐标 * @param destWidth 目标切片宽度 * @param destHeight 目标切片高度 */ public static void abscut(String srcImageFile, String dirImageFile, int x, int y, int destWidth, int destHeight) { try { Image img; ImageFilter cropFilter; // 读取源图像 BufferedImage bi = ImageIO.read(new File(srcImageFile)); int srcWidth = bi.getWidth(); // 源图宽度 int srcHeight = bi.getHeight(); // 源图高度 if (srcWidth >= destWidth && srcHeight >= destHeight) { Image image = bi.getScaledInstance(srcWidth, srcHeight, Image.SCALE_DEFAULT); // 改进的想法:是否可用多线程加快切割速度 // 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(x, y, 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(dirImageFile)); } } catch (Exception e) { e.printStackTrace(); } } public static void cut(InputStream is, File dirImageFile, int x, int y, int destWidth, int destHeight) throws IOException { cut(ImageIO.read(is), dirImageFile, x, y, destWidth, destHeight); } public static void cut(BufferedImage bi, File dirImageFile, int x, int y, int destWidth, int destHeight) { try { Image img; ImageFilter cropFilter; // 读取源图像 int srcWidth = bi.getWidth(); // 源图宽度 int srcHeight = bi.getHeight(); // 源图高度 if (srcWidth >= destWidth && srcHeight >= destHeight) { Image image = bi.getScaledInstance(srcWidth, srcHeight, Image.SCALE_DEFAULT); // 改进的想法:是否可用多线程加快切割速度 // 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(x, y, 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", dirImageFile); } } catch (Exception e) { e.printStackTrace(); } } /** * 缩放图像 * * @param srcImageFile 源图像文件地址 * @param result 缩放后的图像地址 * @param scale 缩放比例 * @param flag 缩放选择:true 放大; false 缩小; */ public static void scale(String srcImageFile, String result, int scale, boolean flag) { try { BufferedImage src = ImageIO.read(new File(srcImageFile)); // 读入文件 int width = src.getWidth(); // 得到源图宽 int height = src.getHeight(); // 得到源图长 if (flag) { // 放大 width = width * scale; height = height * scale; } else { // 缩小 width = width / scale; height = height / scale; } Image image = src.getScaledInstance(width, height, Image.SCALE_DEFAULT); BufferedImage tag = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB); Graphics g = tag.getGraphics(); g.drawImage(image, 0, 0, null); // 绘制缩小后的图 g.dispose(); ImageIO.write(tag, "JPEG", new File(result));// 输出到文件流 } catch (IOException e) { e.printStackTrace(); } } /** * 重新生成按指定宽度和高度的图像 * * @param srcImageFile 源图像文件地址 * @param result 新的图像地址 * @param _width 设置新的图像宽度 * @param _height 设置新的图像高度 */ public static void scale(String srcImageFile, String result, int _width, int _height) { scale(srcImageFile, result, _width, _height, 0, 0); } public static void scale(String srcImageFile, String result, int _width, int _height, int x, int y) { try { BufferedImage src = ImageIO.read(new File(srcImageFile)); // 读入文件 int width = src.getWidth(); // 得到源图宽 int height = src.getHeight(); // 得到源图长 if (width > _width) { width = _width; } if (height > _height) { height = _height; } Image image = src.getScaledInstance(width, height, Image.SCALE_DEFAULT); BufferedImage tag = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB); Graphics g = tag.getGraphics(); g.drawImage(image, x, y, null); // 绘制缩小后的图 g.dispose(); ImageIO.write(tag, "JPEG", new File(result));// 输出到文件流 } catch (IOException e) { e.printStackTrace(); } } /** * 图像类型转换 GIF->JPG GIF->PNG PNG->JPG PNG->GIF(X) */ public static void convert(String source, String result) { try { File f = new File(source); f.canRead(); f.canWrite(); BufferedImage src = ImageIO.read(f); ImageIO.write(src, "JPG", new File(result)); } catch (Exception e) { e.printStackTrace(); } } /** * 彩色转为黑白 * * @param source * @param result */ public static void gray(String source, String result) { try { BufferedImage src = ImageIO.read(new File(source)); ColorSpace cs = ColorSpace.getInstance(ColorSpace.CS_GRAY); ColorConvertOp op = new ColorConvertOp(cs, null); src = op.filter(src, null); ImageIO.write(src, "JPEG", new File(result)); } catch (IOException e) { e.printStackTrace(); } } }