字节缓冲流和基本字节流读取文件（一个字节读取，一个字节数组读取）

package FourWaysToGetText;
import java.io.*;
public class FourWays {
    /**
     * 运用四种方式读写文件，按读取文件大小分为一次读取一个字节和一次读取一个字节数组，
     * 按读取方式可以分为基本字节流和字节缓冲流（其实在使用上区别不大，只是字节缓冲流需要用到基本字节流对象）
     * 自己缓冲的读取效率还是比基本字节流高的，大家可以读取大一些的文件，例如图片或大一点的文本，
     * 可以比较他们在内存中所需要的运行时间。
     */
    public static void main(String[] args) throws IOException {
        Long start1 = System.currentTimeMillis();
        method4();
        Long finish1 = System.currentTimeMillis();
        System.out.print("基本字节流复制文本所耗时间	(ms)");
        System.out.print(finish1 - start1);//获得运行所需时间
    }

    //字节缓冲流一次读写一个字节数组
    public static void method4() throws IOException {

        BufferedOutputStream bufferedOutputStream = new BufferedOutputStream(new FileOutputStream("E:\itcast\creat.txt"));
        BufferedInputStream bufferedInputStream = new BufferedInputStream(new FileInputStream("Gzy_BasicJava\out5.txt"));
        byte[] bytes = new byte[1024];
        int len;
        while ((len = bufferedInputStream.read(bytes)) != -1) {
            bufferedOutputStream.write(len);
        }
        bufferedInputStream.close();
        bufferedOutputStream.close();
    }

    //字节缓冲流一次写入一个字节
    public static void method3() throws IOException {
        BufferedInputStream b1 = new BufferedInputStream(new FileInputStream("E:\itcast\creat.txt"));
        BufferedOutputStream BO = new BufferedOutputStream(new FileOutputStream("Gzy_BasicJava\out5.txt"));
        int len;
        while ((len = b1.read()) != -1) {
            BO.write(len);
        }
        b1.close();
        BO.close();
    }
    //基本字节流一次读写一个字节
    public static void method1() throws IOException {
        FileInputStream in1 = new FileInputStream("E:\itcast\creat.txt");
        FileOutputStream out1 = new FileOutputStream("Gzy_BasicJava\out1.txt");
        int len;
        while ((len = in1.read()) != -1) {
            out1.write(len);
        }
        in1.close();
        out1.close();
    }
    //基本字节流一次读写一个字节数组
    public static void method2() throws IOException {
        FileInputStream in2 = new FileInputStream("E:\itcast\creat.txt");
        FileOutputStream out2 = new FileOutputStream("Gzy_BasicJava\out2.txt");
        int len;
        byte[] bytes = new byte[1024];
        while ((len = in2.read(bytes)) != -1) {
            out2.write(len);
        }
        out2.close();
        in2.close();
    }
}