以图片左上顶点为远点，剪成一张width和height的图片(仅限JPG的图)_切割height= sp[0] width = sp[1] print(图片的高为)-优快云博客

本文介绍了一个Java方法用于处理图像，通过调整尺寸并保持原始图像的比例来生成缩略图。该方法利用了ImageIO库来读取和写入图像文件，并通过复杂的尺寸计算确保缩略图既能适应指定宽度和高度又能保持原始比例。

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public   String   getJSpecialSmallJPG(String fullname,int width,int height,String type)   throws   Exception{
        File   _file   =   new   File(fullname);
        String newsrc = _file.getParent()+type+_file.getName();
        FileInputStream is = null ;

        ImageInputStream iis =null ;
        Iterator readers = ImageIO.getImageReadersByFormatName("jpg");
        is = new FileInputStream(fullname);
       ImageReader reader = (ImageReader)readers.next();
       iis = ImageIO.createImageInputStream(is);
       reader.setInput(iis,true);
       ImageReadParam param = reader.getDefaultReadParam();


       Image   src   =   javax.imageio.ImageIO.read(_file);                                           //构造Image对象
       int   x=src.getWidth(null);     //原图的宽                                                                     //得到源图宽
       int   y=src.getHeight(null);    //原图的高

       int tempheight=0;
       tempheight=(int) (height*x/width);
       int width1=0;
       int height1=0;
       if(tempheight>y){
           width1=(int)(width*y/height);
           height1=y;
       }else{
           height1=(int) (x*height/width);
           width1=x;
       }
       Rectangle rect = new Rectangle(0, 0, width1, height1);
       param.setSourceRegion(rect);

       BufferedImage bi = reader.read(0,param);
       ImageIO.write(bi, "jpg", new File(newsrc));
       return newsrc;
    }