java字节流

/*字节流InputStreamOutputStream 字节流缓冲区BufferedInputStreamBufferedOutputStreamSystem.out:对应的是标准输出设备，控制台System.in:对应的标准输入设备，键盘InputStreamReader:字符流转换为字节流，字节流及其缓冲没有readLine方法，先变为字符流缓冲区*/package pack;import java.io.BufferedInputStream;import java.io.BufferedOutputStream;import java.io.BufferedReader;import java.io.FileInputStream;import java.io.FileOutputStream;import java.io.IOException;import java.io.InputStream;import java.io.InputStreamReader;public class Main {    public static void sys(Object obj) {        System.out.println(obj);    }    public static void main(String[] args) throws IOException {        //method1();        //method2();        //method3();        //method4();        method5();    }    public static void method1() throws IOException {        FileOutputStream fos = new FileOutputStream("E:\\1.txt");        fos.write("abc".getBytes());//write方法里没有字符串参数，转换为字节数组        //字节流不需要刷新        fos.close();    }    public static void method2() throws IOException {        FileInputStream fis = new FileInputStream("E:\\1.txt");        /*int ch = 0;        while((ch=fis.read())!=-1) //一次读一个            sys((char)ch);             fis.close();*/        byte[] buf = new byte[fis.available()];//fis.available是个数        int len = 0;        while((len=fis.read(buf))!=-1)            sys(new String(buf,0,len));        fis.close();        }    /*拷贝图片，字节流*/    public static void method3() throws IOException {        FileOutputStream fos = new FileOutputStream("E:\\2.jpg");        FileInputStream fis = new FileInputStream("E:\\1.jpg");        int ch = 0;        while((ch=fis.read())!=-1)            fos.write(ch);        fos.close();        fis.close();    }    /*拷贝mp3,通过缓冲区*/    public static void method4() throws IOException {        BufferedOutputStream bufos=new BufferedOutputStream(new FileOutputStream("E:\\2.mp3"));        BufferedInputStream bufis=new BufferedInputStream(new FileInputStream("E:\\1.mp3"));        int ch = 0;        while((ch=bufis.read())!=-1)            bufos.write(ch);        bufis.close();        bufos.close();    }    public static void method5() throws IOException {        //字节流及其缓冲没有readLine方法，先变为字符流缓冲区        InputStream in = System.in; //获取键盘输入对象        InputStreamReader isr = new InputStreamReader(in);//字节流转换为字符流        BufferedReader bufr = new BufferedReader(isr); //字符流缓冲区        String line = null;        while((line=bufr.readLine())!=null) {            if(line.equals("over"))                break;            sys(line);        }        bufr.close();    }}