转载自 BufferedInputStream与ImageInputStream

BufferedInputStream读取图片文件（jpg格式）,但是图片大小在1M到200M之间都有，由于图片太大，不知道怎么处理好，谢谢各位大哥大姐教教小弟，现在只能读取1M以下读图片，但要求是需要读取1M到200M的大图片

下面是方法的代码：

 public String  changeImg2(String filename){       //ImgRotate ir = new ImgRotate();String result="";File file1 = new File(filename);BufferedImage image = null;  int  height =0;int  width =0;try {   // image = ImageIO.read(file1); //int width = image.getWidth();// int height = image.getHeight();//ImgRotate ir = new ImgRotate();Iterator   readers = null;if((filename.substring(filename.lastIndexOf(".")+1).equals("jpg"))){readers   =   ImageIO.getImageReadersByFormatName( "jpg"); }else if((filename.substring(filename.lastIndexOf(".")+1).equals("bmp"))){readers   =   ImageIO.getImageReadersByFormatName( "bmp"); }else if((filename.substring(filename.lastIndexOf(".")+1).equals("jpeg"))){readers   =   ImageIO.getImageReadersByFormatName( "jpeg"); }else if((filename.substring(filename.lastIndexOf(".")+1).equals("gif"))){readers   =   ImageIO.getImageReadersByFormatName( "gif"); }ImageReader   reader   =   (ImageReader)readers.next(); try   { // FileInputStream   source   =   new   FileInputStream(filename);//your   image   path //   FileReader source= new FileReader(filename);//InputStream source=new DataInputStream(new BufferedInputStream(new FileInputStream(filename)));BufferedInputStream  source = new BufferedInputStream(new FileInputStream(filename));ImageInputStream iis=   ImageIO.createImageInputStream(source); reader.setInput(iis,true); height   =   reader.getHeight(0); width   =   reader.getWidth(0); result=String.valueOf(width)+","+String.valueOf(height);reader.dispose(); iis.close(); source.close(); if(width>height){rotateImage(file1,90);}System.out.println("width="+width);System.out.println("height="+height);}   catch(Exception   e)   { e.printStackTrace();System.out.println(e.getMessage()); }} catch (Exception e) {   e.printStackTrace();   } return result;