字节流

范例：
public class ByteDemo {
    public static void main(String[] args) {
        OutputStream os = null;
        InputStream is = null;
        FileOutputStream os1 = null;
        try {
            //1.创建文本文件
            os = new FileOutputStream("E:\Java实训课总结\2016.3.26\我的青春谁做主.txt");
            String str = "我的青春我做主，燃烧吧，少年！";
            String str2 = "yimifkaskfdajiofjaeiomvm我是几的司法计算女";
            byte[] b = str.getBytes();
            byte[] b2 = str2.getBytes();
            os.write(b);
            os.write(b2);
            os.flush();
            
            //2.读取文本内容
            is = new FileInputStream("E:\Java实训课总结\2016.3.26\我的青春谁做主.txt");
            byte[] data = new byte[1024];
            int len = -1;
            //★len = is.read(data,0,data.length)★ 或者 ★i = is.read(copyData)★ // os1.write(copyData,0,copyData.length);
            while ((len = is.read(data,0,data.length)) != -1) {
                System.out.println(new String(data));
            }
            
            //3.文件内容复制到另一个文本文件中
            os1 = new FileOutputStream("E:\Java实训课总结\2016.3.26\我的青春谁做主copy.txt");
            byte[] copyData = new byte[1024];
            int i = -1;
            /**
             * 1.字符流，如何读出的中文不是乱码,★打印的是new String(data)/new String(copyData)★
             * 2.怎么读取中英文本。同上              
             */
            while(((i = is.read(copyData)) != -1)) {
                os1.write(copyData,0,copyData.length);
                System.out.println(new String(copyData));
            }
            //显示文本内容
            os1.flush();
            System.out.println("复制完成");
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
//                os1.close();
                os.close();
                is.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
}

-------------------二进制文件读写---------------------    
DataInputStream
    FileInputStream的子类
    与其父类一起使用，读取二进制文件

DataOutputStream
    FileOutputStream的子类
    与其父类一起使用，写出二进制文件
范例：
public class DataStreamDemo {
    public static void main(String[] args) {
        DataInputStream dis = null;
        DataOutputStream dos = null;
        try {
            //构建二进制数据的输入流
            dis = new DataInputStream(new FileInputStream("D:\Documents\My Pictures\DSCF7863 (1).jpg"));
            //构建二进制数据的输出流
            dos = new DataOutputStream(new FileOutputStream("E:\Java实训课总结\2016.3.26" + File.separator + "picture.jpg"));
            //读写文件
            int len;
            while ((len = dis.read()) != -1) {
                dos.write(len);
            }
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            //关闭流
            try {
                dos.close();
                dis.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
}