java byte大数组按大小拆分小数组

直接上代码：  

/**

     * splitAry方法<br>
     * @param ary 要分割的数组
     * @param subSize 分割的块大小
     * @return
     *
     */  
    public static Object[] splitAry(byte[] ary, int subSize) {  
          int count = ary.length % subSize == 0 ? ary.length / subSize: ary.length / subSize + 1;  
 
          List<List<Byte>> subAryList = new ArrayList<List<Byte>>();  
 
          for (int i = 0; i < count; i++) {  
           int index = i * subSize;  
           List<Byte> list = new ArrayList<Byte>();  
           int j = 0;  
               while (j < subSize && index < ary.length) {  
                    list.add(ary[index++]);  
                    j++;  
               }  
           subAryList.add(list);  
          }  
            
          Object[] subAry = new Object[subAryList.size()];  
            
          for(int i = 0; i < subAryList.size(); i++){  
               List<Byte> subList = subAryList.get(i);  
               byte[] subAryItem = new byte[subList.size()];  
               for(int j = 0; j < subList.size(); j++){  
                   subAryItem[j] = subList.get(j);  
               }  
               subAry[i] = subAryItem;  
          }  
            
          return subAry;  

         }

/**
     * 从网络Url中下载文件
     * @param urlStr
     * @param fileName
     * @param savePath
     * @throws IOException
     */
    public static void  downLoadFromUrl(String urlStr,String fileName,String savePath) throws IOException{  
        URL url = new URL(urlStr);    
        HttpURLConnection conn = (HttpURLConnection)url.openConnection();    
                //设置超时间为3秒  
        conn.setConnectTimeout(3*1000);  
        //防止屏蔽程序抓取而返回403错误  
        conn.setRequestProperty("User-Agent", "Mozilla/4.0 (compatible; MSIE 5.0; Windows NT; DigExt)");  
 
        //得到输入流  
        InputStream inputStream = conn.getInputStream();    
        //获取自己数组  
        byte[] getData = readInputStream(inputStream);      
 
        //文件保存位置  
        File saveDir = new File(savePath);  
        if(!saveDir.exists()){  
            saveDir.mkdir();  
        }  
        File file = new File(saveDir+File.separator+fileName);      
        FileOutputStream fos = new FileOutputStream(file);       
        fos.write(getData);   
        if(fos!=null){  
            fos.close();    
        }  
        if(inputStream!=null){  
            inputStream.close();  
        }  
        if(fileName.indexOf("amr") > 0){
            try {
                FileSizeUtil.amrToMp3(saveDir+File.separator+fileName);
            } catch (EncoderException e) {
            }
        }
 
 
        System.out.println("info:"+url+" download success");   
 
    }
    /**
     * 从输入流中获取字节数组
     * @param inputStream
     * @return
     * @throws IOException
     */  
    public static  byte[] readInputStream(InputStream inputStream) throws IOException {    
        byte[] buffer = new byte[1024];    
        int len = 0;    
        ByteArrayOutputStream bos = new ByteArrayOutputStream();    
        while((len = inputStream.read(buffer)) != -1) {    
            bos.write(buffer, 0, len);    
        }    
        bos.close();    
        return bos.toByteArray();    
    }  

测试：

public static void main(String[] args) throws EncoderException {

       //通过图片url生成二进制数组

        byte [] data = FileSizeUtil.getImageBinaryByUrl("http://localhost:8080/DSTAXI/upload/servicelicense/201511061406553284.png");
        System.out.println(data.length);
        System.out.println(FileSizeUtil.byte2hex(data));
        Object[] objdata = FileSizeUtil.splitAry(data, 512);
        int count = 0;
        for(Object obj : objdata){
            byte [] bytedata = (byte [])obj;
            System.out.println(bytedata.length);
            System.out.println(FileSizeUtil.byte2hex(bytedata));
            count = count + 1;
        }
        System.out.println(count);
    }