package com.quanshi.ums.gate.view.rest; import java.awt.Color; import java.awt.Graphics; import java.awt.Graphics2D; import java.awt.Image; import java.awt.Toolkit; 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.IOException; import java.text.SimpleDateFormat; import java.util.Date; import javax.imageio.ImageIO; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpSession; import org.springframework.security.core.context.SecurityContextHolder; import org.springframework.web.multipart.MultipartFile; public class ImgEditor { /** * 改变图片尺寸 * @param srcFileName 源图片路径 * @param tagFileName 目的图片路径 * @param width 修改后的宽度 * @param height 修改后的高度 */ public void zoomImage(String srcFileName,String tagFileName,int width,int height){ try { BufferedImage bi = ImageIO.read(new File(srcFileName)); BufferedImage tag=new BufferedImage(width,height, BufferedImage.TYPE_INT_RGB); tag.getGraphics().drawImage(bi, 0, 0, width, height, null); ImageIO.write(tag, "jpg", new File(tagFileName));//画图 } catch (IOException e) { e.printStackTrace(); } } /** * 缩放图像（按高度和宽度缩放） * @param srcImageFile 源图像文件地址 * @param result 缩放后的图像地址 * @param height 缩放后的高度 * @param width 缩放后的宽度 * @param bb 比例不对时是否需要补白：true为补白; false为不补白; */ public void scale(String srcImageFile, String result, int height, int width, boolean bb) { try { double ratio = 0.0; // 缩放比例 File f = new File(srcImageFile); BufferedImage bi = ImageIO.read(f); Image itemp = bi.getScaledInstance(width, height, bi.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 (bb) {//补白 BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB); Graphics2D g = image.createGraphics(); g.setColor(Color.white); 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), Color.white, null); else g.drawImage(itemp, (width - itemp.getWidth(null)) / 2, 0, itemp.getWidth(null), itemp.getHeight(null), Color.white, null); g.dispose(); itemp = image; } ImageIO.write((BufferedImage) itemp, "JPEG", new File(result)); } catch (IOException e) { e.printStackTrace(); } } /** * 图像切割(按指定起点坐标和宽高切割) * @param srcImageFile 源图像地址 * @param result 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 void cut(String srcImageFile, String result, int x, int y, int width, int height) { try { // 读取源图像 BufferedImage bi = ImageIO.read(new File(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, "JPEG", new File(result)); } } catch (Exception e) { e.printStackTrace(); } } //获得文件名字 public String getFileName(MultipartFile file, HttpServletRequest request,HttpSession session){ String FILE_PATH = session.getServletContext().getRealPath("https://www.jb51.net/") + "upload"; String fileName = file.getOriginalFilename(); String[] suffixNameArr = fileName.split("\\."); String suffixName = suffixNameArr[suffixNameArr.length-1]; String userName = SecurityContextHolder.getContext().getAuthentication().getName(); return getTime() + userName+"."+suffixName; } //文件上传,返回文件路径 public String uploadFile(MultipartFile file, HttpServletRequest request,HttpSession session) throws IOException { String FILE_PATH = session.getServletContext().getRealPath("https://www.jb51.net/") + "upload"; String fileName = getFileName(file,request,session); File tempFile = new File(FILE_PATH, fileName); if (!tempFile.getParentFile().exists()) { tempFile.getParentFile().mkdir(); } if (!tempFile.exists()) { tempFile.createNewFile(); } file.transferTo(tempFile); //将上传文件写到服务器上指定的文件。 return FILE_PATH + "\\" + tempFile.getName(); } /* public static File getFile(String fileName) { return new File(FILE_PATH, fileName); } */ public String getTime(){ Date date = new Date(); SimpleDateFormat df = new SimpleDateFormat("yyyyMMddHHmmss");//设置日期格式 String nowTime = df.format(date).toString(); return nowTime; } }
这样就将图片要裁剪的图片路径返回页面展示