servlet中压缩数据和下载图片

//压缩数据，并传送给浏览器

         StringBuffer sb = new StringBuffer();

           for (int i =0; i <80000; i++) {

               sb.append("abcd");

           }

      

           ByteArrayOutputStreambout = new ByteArrayOutputStream();

           GZIPOutputStream gout= new GZIPOutputStream(bout);

           gout.write(sb.toString().getBytes());

           gout.close();

      

   response.getOutputStream().write(bout.toByteArray());

 

 

   //下载图片

response.setHeader("content-disposition", "attachment;filename=张三.jpg");

        InputStream inp = this.getServletContext().getResourceAsStream("1.jpg");

        OutputStream out = response.getOutputStream();

        byte[] buf = newbyte[1024];

        int len = -1;

        while( (len = inp.read(buf)) > -1) {

            out.write(buf,0,len);

        }

        out.close();

    inp.close();