标签:|| encode warnings 扩展 druid lan oid stat enc
import java.awt.Graphics; import java.awt.Image; import java.awt.image.BufferedImage; import java.io.File; import java.io.FileOutputStream; import java.io.IOException; import javax.imageio.ImageIO; import com.alibaba.druid.util.StringUtils; import com.jfinal.kit.StrKit; import com.sun.image.codec.jpeg.JPEGCodec; import com.sun.image.codec.jpeg.JPEGEncodeParam; import com.sun.image.codec.jpeg.JPEGImageEncoder; import java.awt.image.BufferedImage; import java.rmi.registry.Registry; @SuppressWarnings("restriction") public class ImageKit { private final static String[] imgExts=new String[]{"jpg", "jpeg", "png", "bmp"}; public static String getExtName(String fileName){ if(StringUtils.isEmpty(fileName)) return null; int idx=fileName.lastIndexOf(‘.‘); if(idx!=-1&&(idx+1)<fileName.length()){ return fileName.substring(idx+1); }else{ return null; } } //通过文件扩展名,是否为支持的图片文件 public static boolean isImageExtName(String fileName){ if(StrKit.isBlank(fileName)){ return false; } fileName=fileName.trim().toLowerCase(); String ext=getExtName(fileName); if(StringUtils.isEmpty(ext)) return false; for (String str:imgExts){ if(str.equals(ext)){ return true; } } return false; } public static final boolean notImageExtName(String fileName){ return !isImageExtName(fileName); } public static BufferedImage loadImageFils(String sourceImageFileName){ if(notImageExtName(sourceImageFileName)){ throw new IllegalArgumentException("只支持如下几种类型的图像文件:jpg、jpeg、png、bmp"); } File sourceImageFile=new File(sourceImageFileName); if(!sourceImageFile.exists()||!sourceImageFile.isFile()){ throw new IllegalArgumentException("文件不存在"); } try { return ImageIO.read(sourceImageFile); }catch (Exception e){ throw new RuntimeException(e); } } public static void zoom(int maxWidth,File srcFile,String saveFile){ float quality=0.8f; try { BufferedImage srcImage = ImageIO.read(srcFile); int srcWidth = srcImage.getWidth(); int srcHeight = srcImage.getHeight(); if(srcWidth<=maxWidth){ saveWithQuality(srcImage, quality, saveFile); }else { float scalingRatio=(float) maxWidth/(float)srcWidth; float maxHeight = ((float)srcHeight * scalingRatio); BufferedImage ret=resize(srcImage,maxWidth,(int) maxHeight); saveWithQuality(ret, quality, saveFile); } }catch (Exception e) { throw new RuntimeException(e); } } public static BufferedImage crop(String sourceImageFile,int left, int top, int width, int height){ if (notImageExtName(sourceImageFile)) { throw new IllegalArgumentException("只支持如下几种类型的图像文件:jpg、jpeg、png、bmp"); } try { BufferedImage bi= ImageIO.read(new File(sourceImageFile)); width = Math.min(width, bi.getWidth()); height = Math.min(height, bi.getHeight()); if(width <= 0) width = bi.getWidth(); if(height <= 0) height = bi.getHeight(); left = Math.min(Math.max(0, left), bi.getWidth() - width); top = Math.min(Math.max(0, top), bi.getHeight() - height); return bi.getSubimage(left,top,width,height); }catch (Exception e){ throw new RuntimeException(e); } } public static void save(BufferedImage bi,String outputImageFile){ FileOutputStream newImage=null; try { ImageIO.write(bi,getExtName(outputImageFile),new File(outputImageFile)); } catch(Exception e){ throw new RuntimeException(e); } finally { if(newImage!=null){ try { newImage.close(); } catch (IOException e) { throw new RuntimeException(e); } } } } public static BufferedImage resize(BufferedImage bi, int toWidth, int toHeight) { Graphics g=null; try { Image scaledImage = bi.getScaledInstance(toWidth, toHeight, Image.SCALE_SMOOTH); BufferedImage ret = new BufferedImage(toWidth, toHeight, BufferedImage.TYPE_INT_RGB); g = ret.getGraphics(); g.drawImage(scaledImage, 0, 0, null); return ret; } catch (Exception e) { throw new RuntimeException(e); } finally { if (g != null) { g.dispose(); } } } public static void saveWithQuality(BufferedImage im, float quality, String outputImageFile){ FileOutputStream newImage = null; try { newImage = new FileOutputStream(outputImageFile); JPEGImageEncoder encoder=JPEGCodec.createJPEGEncoder(newImage); JPEGEncodeParam jep = JPEGCodec.getDefaultJPEGEncodeParam(im); jep.setQuality(quality, true); encoder.encode(im, jep); }catch (Exception e) { throw new RuntimeException(e); } finally { if (newImage != null) { try {newImage.close();} catch (IOException e) {throw new RuntimeException(e);} } } } }
标签:|| encode warnings 扩展 druid lan oid stat enc
原文地址:https://www.cnblogs.com/sunliyuan/p/10669630.html