通过ByteArrayOutputStream将inputStream转变为outputStream(4)

 
                        int i=0;   
 
//                      ii.read(b, off, len)   
 
                        byte[] by = new byte[2048];   
 
                        while((ch=fis.read(by))!=-1){         
 
                                bos.write(by,0,ch);     
 
                                if(i++==bufferSize){   
 
                                    bos.flush();   
 
                                    i=0;   
 
                                }   
 
                        }       
 
                        bos.flush();    //提交文件流，很关键   
 
                        fis.close();      
 
//                      ZipUtil.getZipName().close();   
 
                        return baos;