JAVA实现图片裁剪

 1 /** 2      * 裁剪图片 3      * @param src 源图片 4      * @param dest 裁剪后的图片 5      * @param x    裁剪范围的X坐标 6      * @param y 裁剪范围的Y坐标 7      * @param w 裁剪范围的高度 8      * @param h 裁剪范围的宽度 9      * @param destW 裁剪后图片的宽度10      * @param destH 裁剪后图片的高度11      * @throws IOException12      */13     public static void cutImage(String src, String dest, int x, int y, int w,14             int h,int destW,int destH) throws IOException {15         try{16             17             //未知问题，不知道为啥路径的最后会有/r/n18             19             src = src.replace("/r/n", "");20             dest = dest.replace("/r/n", "");21             System.out.PRintln("CutImage:src=" + src + ";dest=" + dest + ";x=" + x + ";y=" + y);22             File file = new File(src);23             if(file.exists()){24                 Iterator<ImageReader> iterator = ImageIO.getImageReadersByFormatName("jpg");25                 ImageReader reader = (ImageReader) iterator.next();26                 InputStream in = new FileInputStream(src);27                 ImageInputStream iis = ImageIO.createImageInputStream(in);28                 reader.setInput(iis, true);29                 ImageReadParam param = reader.getDefaultReadParam();30                 Rectangle rect = new Rectangle(x, y, w, h);31                 param.setSourceRegion(rect);32                 BufferedImage bi = reader.read(0, param);33                 if(w != destW){ //被拉伸或者缩小过34                     bi.flush();35                     BufferedImage newImage = new BufferedImage(destW,destH,bi.getType());36                     Graphics g = newImage.getGraphics();37                     g.drawImage(bi,0,0,destW,destH,null,null);38                     g.dispose();39                     ImageIO.write(newImage, "jpg", new File(dest));40                 }else{41                     ImageIO.write(bi, "jpg", new File(dest));42                 }43                 iis.close();44                 in.close();45                 //最后删除临时文件46                 file.delete();47             }else{48                 System.out.println("找不到要裁剪的文件：FileName=" + src);49             }50         }catch(Exception ex){51             ex.printStackTrace();52         }53     }