通过ByteArrayOutputStream将inputStream转变为outputStream

通过ByteArrayOutputStream将inputStream转变为outputStream

1.首先，先编写一个获取文件输入流的方法 ops()。
2. 之后在调用此方法获得输入流，并通过 castToBAOStream(Object obj,int bufferSize)进行转化。
3.最后，写出转化成功的输出流。

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Java代码
public class Stream {



    public static final int StreamFlushBufferSzie=100;//buffer size= 1K



      public static ByteArrayOutputStream castToBAOStream(Object obj,int bufferSize){



//          Log logger = LogFactory.getLog(CommonUtil.class);



            ByteArrayOutputStream baos=new ByteArrayOutputStream();



            if(obj.getClass().isInstance(baos)){

                return (ByteArrayOutputStream)obj;

            }else{

                InputStream fis;

                try{

                    fis=(FileInputStream)obj;

                    try{

                        BufferedInputStream bis=new BufferedInputStream(fis);

                        baos=new ByteArrayOutputStream();

                        BufferedOutputStream bos=new BufferedOutputStream(baos);

                        int ch;

                        int i=0;

                        while((ch=bis.read())!=-1){

                                bos.write(ch);

                                if(i++==bufferSize){

                                    bos.flush();

                                    i=0;

                                }

                        }

                        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);

补充：移动开发 , Android ,