常用java中I/O流

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1、字节流

/**     * 字节文件输入流     */    private static void fileInputStreamMethod2() {        try {            InputStream inputStream=new FileInputStream("E://TestDemoFolder//A.txt");            byte[] b=new byte[2];            int i2=0;            while ((i2=inputStream.read(b))!=-1){                System.out.println(new String(b,0,i2));            }            inputStream.close();        } catch (Exception e) {            e.printStackTrace();        }    }    /**     * 文件输入流     */    private static void fileInputStreamMethod() {        try {            InputStream inputStream=new FileInputStream("E://TestDemoFolder//A.txt");            int i=0;            while ((i=inputStream.read())!=-1){                System.out.println(i);            }            inputStream.close();        } catch (FileNotFoundException e) {            e.printStackTrace();        } catch (IOException e) {            e.printStackTrace();        }    }

 /**     * 字节文件输出流     */    private static void fileOutPutStreamMethod() {        try {            OutputStream outPutStream=new FileOutputStream("E://TestDemoFolder//A.txt");            outPutStream.write("\r\n".getBytes());            outPutStream.write("helloWorld".getBytes());            outPutStream.close();        } catch (Exception e) {            e.printStackTrace();        }    }

 /**     * 字节缓冲输入流     */    private static void bufferedInputStreamMethod() {        try {            InputStream in=new FileInputStream("E://TestDemoFolder//A.txt");            BufferedInputStream bis=new BufferedInputStream(in);            byte[] b=new byte[2];            int i=0;            while ((i=bis.read(b))!=-1){                System.out.println(new String(b,0,i));            }            bis.close();        } catch (Exception e) {            e.printStackTrace();        }    }

  /**     * 字节缓冲输出流     */    private static void bufferedOutputStreamMethod() {        try {            OutputStream os=new FileOutputStream("E://TestDemoFolder//A.txt",true);            BufferedOutputStream bos=new BufferedOutputStream(os);            bos.write("\r\n".getBytes());            bos.write("hello android".getBytes());            bos.close();        } catch (Exception e) {            e.printStackTrace();        }    }

 /**     * 缓冲高效输入输出流     */    private static void bufferedReaderAndWriterMethod() {        try {            InputStream in=new FileInputStream("E://TestDemoFolder//test.mp3");            BufferedInputStream bis=new BufferedInputStream(in);            OutputStream out=new FileOutputStream("E://TestDemoFolder//test2.mp3");            BufferedOutputStream bos=new BufferedOutputStream(out);            int i=0;            byte[] b=new byte[1024];            long begin=System.currentTimeMillis();            while ((i=bis.read(b))!=-1){                bos.write(b,0,i);            }            long end=System.currentTimeMillis();            System.out.println("cost:"+(end-begin));            bos.close();            bis.close();            out.close();            in.close();        }catch (Exception e){            e.printStackTrace();        }    }

2、字符流

 /**     * 字符转换输出流     */    private static void outPutStreamWriterMethod() {        try {            OutputStream o=new FileOutputStream("E://TestDemoFolder//A.txt");            OutputStreamWriter outputStreamWriter=new OutputStreamWriter(o);            outputStreamWriter.write("hello",0,5);            outputStreamWriter.close();            o.close();        }catch (Exception e){            e.printStackTrace();        }    }    /**     * 字符转换输入流     */    private static void inputStreamReaderMethod() {        try {            InputStream in=new FileInputStream("E://TestDemoFolder//A.txt");            InputStreamReader reader=new InputStreamReader(in);            int len=0;            byte[]b=new byte[2];            while ((reader.read())!=-1){                System.out.println(len);            }            reader.close();            in.close();        }catch (Exception e){            e.printStackTrace();        }    }

 /**     * 字符缓冲输入流     */    private static void bufferedReaderMethod() {        try {            InputStream is=new FileInputStream("E://TestDemoFolder//A.txt");            InputStreamReader isr=new InputStreamReader(is);            BufferedReader br=new BufferedReader(isr);            String str="";            while ((br.readLine())!=null){                System.out.println(str);            }            //关流            br.close();            isr.close();            is.close();        }catch (Exception e){            e.printStackTrace();        }    }

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