java _io_字節(jié)緩沖流(裝飾器)輸入、輸出

*裝飾模式

• 字節(jié)緩沖流
• BufferedInputStream bis=new BufferedInputStream(inputStream is)
• BufferedOutputStream bos=new BufferedOutputStream(OutputStream os)
• 最底層一定是節(jié)點(diǎn)流
• 只需要釋放最外層的處理流,若要手動(dòng)關(guān)閉遵循從里到外的順序關(guān)閉(從字節(jié)流到處理流)
• 默認(rèn)為8k，可以改變
  //參數(shù)是字節(jié)輸入流對(duì)象
  InputStream is =new BufferedInputStream(new InputStream(f));
  OutputStream os=new BufferedOutputStream(new OutputStream(f));

處理流裝飾字節(jié)流輸入:

    File f =new File("C:\\Users\\10853\\eclipse-workspace\\hell\\src\\hell\\abc");

    InputStream is =null;
    try {
        **is=new BufferedInputStream(new FileInputStream(f));**

        byte[] flush =new byte[1024];
        int len=-1;
        while((len=is.read(flush))!=-1)
        {
            is.read(flush,0,len);
        }
    }catch(FileNotFoundException e)
    {
        e.printStackTrace();
    }catch(IOException e)
    {
        e.printStackTrace();
    }finally {

        try {

            if(null!=is)
            {
                i**s.close();**  //關(guān)閉處理流，會(huì)自動(dòng)關(guān)閉字節(jié)流
            }
        }catch(IOException e)
        {
            e.printStackTrace();
        }

    }

處理流裝飾字節(jié)流輸出:

    File f=new File("D:d/c.txt");

    OutputStream os =null;
    try
    {
    **  os=new BufferedOutputStream(new FileOutputStream(f));**
        String s="addaa";
        byte[] datas=s.getBytes();
        os.write(datas,0,datas.length);
        os.flush();

    }catch(FileNotFoundException e)
    {
        e.printStackTrace();
    }catch(IOException e)
    {
        e.printStackTrace();
    }finally {
        try {
            if(**null!=os**)  //關(guān)閉處理流會(huì)自動(dòng)關(guān)閉字節(jié)流
            {
                os.close();
            }
        }catch(IOException e)
        {
            e.printStackTrace();
        }   
    }