字节、字符流

字节流：

输入流：

int b;
FileInputStream in = new FileInputStream(String Filepath);
b = in.read();   //将读取到的一个字节存到b中 读取到文件末尾会返回-1
in.close;   //关闭流

输出流：

String s;
FileOutputStream out = new FileOutputStream(String Filepath);
//FileOutputStream out = new FileOutputStream(String Filepath, boolean append); 用于追加

byte[] b = s.getBytes();
for (int i = 0; i < b.length; i++) {
	out.write(b[i]);
}

out.close;   //关闭流

缓冲区：

FileInputStream in = new FileInputStream(String Filepath);
FileOutputStream out = new FileOutputStream(String Filepath);
	
int len;
byte[] buff = new byte[1024];

while (len = in.read(buff) != -1) {
	out.write(buff, 0, len);
}
in.close;
out.close;

这样可加快速度

	BufferedInputStream bis = new BufferedInputStream(new FileInputStream(String Filepath));
	BufferedOutputStream bos = new BufferedOutputStream(new BufferedOutputStream(String Filepath));
	int len;
	while ((len = bis.read()) != -1) {
		bos.write(len);
	}
	bis.close;
	bos.close;

字符流：

输入流：

FileReader reader = new FileReader(String Filepath);
	int ch;
	while ((ch = reader.read()) != -1) {
	}
reader.close();	

输出流：

	FileWriter writer = new FileWriter(String Filepath);
	String str;
	writer.write(str);
	writer.close;

缓冲流：

	BufferedReader in = new BufferedReader(new FileReader(String Filepath));
	BufferedWriter out = new BufferedWriter(new FileWriter(String Filepath));
	
	String line = null;
	
	While ( (line = in.readLine()) != null) {	//readLine为读一行内容
		out.write(line);
		out.newLine();		//换行
		out.flush();	//一次flush即将out缓冲区内的内容放到文件里
	}
	in.close();
	out.close();

转换流：

	FileInputStream in = new FileInputStream(String Filepath);
	InputStreamReader isr = new InputStreamReader(in);
	BufferedReader br = new BufferedReader(isr);