通过ByteArrayOutputStream将inputStream转变为outputStream(3)

 
                        bos.flush();    //提交文件流，很关键   
 
                        bis.close();      
 
                        return baos;   
 
                    }catch(ClassCastException e){   
 
//                      logger.info("Stream object not a ByteArrayOutputStream or a FileInputStream:",e);   
 
                        return null;   
 
                    }catch(Exception e){   
 
//                      logger.info("baos is null:",e);   
 
                        return null;   
 
                    }   
 
                }catch(ClassCastException e){   
 
                    fis=(InflaterInputStream)obj;   
 
                    try{   
 
                        baos=new ByteArrayOutputStream();       
 
                        BufferedOutputStream bos=new BufferedOutputStream(baos);     
 
                        int ch;