调用imagick做图片等比例压缩5M到100kb

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import java.io.File; import java.io.FileInputStream; import java.io.IOException;   import org.im4java.core.ConvertCmd; import org.im4java.core.IM4JavaException; import org.im4java.core.IMOperation;   public class IMagickUtils {           public static File IMCompress(String IMPath,File file){         if(file.length()<1024*516L){ // 比0.5M大的图片压缩处理，否则直接使用             return file;         }         int width = 800;         int height = 600;         try {             SimpleImageInfo imageInfo = new SimpleImageInfo(new FileInputStream(file));             width = imageInfo.getWidth();             height = imageInfo.getHeight();         } catch (IOException e1) {             System.out.println("获取图片宽高失败,Imagickutils.java");         }         if(width>800){ // 按比例压缩图片大小,宽度最大为800              height = (int) (800.0*height/width);              width = 800;         }         String size = width+"x"+height+"!";         String filePath = file.getAbsolutePath();                   IMOperation operation = new IMOperation();         operation.addImage(filePath);         operation.addRawArgs("-thumbnail", size);         operation.addRawArgs("-quality", "80%");         operation.addRawArgs("-units", "pixelsperinch");         operation.addRawArgs("-density", "96");         operation.addRawArgs("-colorspace","RGB"); // 转成RGB系 避免CMYK模式下的imageIO水印异常         operation.addRawArgs("-strip");         operation.addImage(filePath);           ConvertCmd cmd = new ConvertCmd();         cmd.setSearchPath(IMPath);  //Windows需要设置，Linux不需要         try {             cmd.run(operation);         } catch (Exception e) {             e.printStackTrace();         }         return file;     }       public static void main(String[] args) throws IOException, InterruptedException, IM4JavaException {         String impath = "D:\\Program Files\\ImageMagick-7.0.7-Q16";         File file = new File("C:\\Users\\lenovo\\Downloads\\33.jpg");         file = IMCompress(impath, file);     }   }