FileStream

/*
字符流：
FileReader
FileWriter。

BufferedReader
BufferedWriter

字节流：
InputStream OutputStream

需求，想要操作图片数据。这时就要用到字节流。
复制一个图片.

/
import java.io.;
class FileStream
{
public static void main(String[] args) throws IOException
{
readFile_3();
}

public static void readFile_3()throws IOException
{
	FileInputStream fis = new FileInputStream("fos.txt");

// int num = fis.available();
byte[] buf = new byte[fis.available()];//定义一个刚刚好的缓冲区。不用在循环了。

	fis.read(buf);

	System.out.println(new String(buf));

	fis.close();
}


public static void readFile_2()throws IOException
{
	FileInputStream fis = new FileInputStream("fos.txt");

	byte[] buf = new byte[1024];
	int len = 0;
	while((len=fis.read(buf))!=-1)
	{
		System.out.println(new String(buf,0,len));
	}

	fis.close();
	
}



public static void readFile_1()throws IOException
{
	FileInputStream fis = new FileInputStream("fos.txt");

	int ch = 0;

	while((ch=fis.read())!=-1)
	{
		System.out.println((char)ch);
	}

	fis.close();
}

public static void writeFile()throws IOException
{
	FileOutputStream fos = new FileOutputStream("fos.txt");
	

	fos.write("abcde".getBytes());

	fos.close();

	
}

}