换行符

windows：\r\n

linux：\n

mac：\r

字节流写数据的三种方式

1
2
3

void write(int b);							//以此写一个字节数据
void write(byte[]b);						// 一次写一个字节数组数据
void write(byte[]b,int off,int len);		//一次写一个字节数组的部分数据

读取文件案例

/**
 * 简单的读取文件流程
 * @throws IOException
 */
private static void readFile() throws IOException {
    // 读取文件
    FileInputStream fis = new FileInputStream("p:/test/a.txt");
    int cha; // 定义每次读取的内容存放介质
    while ((cha = fis.read())!=-1){
        //输出内容
        System.out.println((char)cha);
    }
    //释放资源
    fis.close();
}

复制文件

简单复制

private static void copyFile() throws IOException {

        FileOutputStream fileOutputStream = new FileOutputStream("./a.txt");
        FileInputStream fileInputStream = new FileInputStream("v:/study/a.txt");

        int b ;
        while ((b = fileInputStream.read())!=-1){
            fileOutputStream.write(b);
        }
        fileInputStream.close();
        fileOutputStream.close();
}

使用byte[]提高复制效率

/**
 * 利用字节数组提高复制效率
 * @throws IOException
 */
private static void copymedia() throws IOException {
    FileOutputStream fos = new FileOutputStream("./a.mp4");
    FileInputStream fis = new FileInputStream("P:\\Study\\self-study\\Java\\2阶段二：JavaSE进阶\\第二章 2-Stream & IO\\0-1 Stream\\01-Stream流-初体验.mp4");
    byte [] bytes = new byte[1024];
    int len;
    while((len = fis.read(bytes))!=-1){
        fos.write(bytes,0,len);
    }
    fis.close();
    fos.close();
}

使用字节缓冲byte[]

private static void copyBufferArr() throws IOException {
    BufferedInputStream bis = new BufferedInputStream(new BufferedInputStream(new FileInputStream("P:\\Study\\self-study\\Java\\2阶段二：JavaSE进阶\\第二章 2-Stream & IO\\0-1 Stream\\01-Stream流-初体验.mp4")));
    BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream("./copy.mp4"));

    byte [] bytes= new byte[1024];
    int len;
    while ((len = bis.read(bytes))!=-1){
        bos.write(bytes,0,len);
    }
    bis.close();
    bos.close();
}