public static void main(String[] args) throws IOException {
字节流（图片）
FileInputStream fis=new FileInputStream("F:\test.rar");
//FileInputStream fis = System.in; //控制台键盘录入InputStream
FileOutputStream fos = new FileOutputStream("F:\Copy.rar");
//FileOutputStream fos = System.out; //目的地：控制台PrintStream
//BufferedInputStream bis = new BufferedInputStream(fis);
//BufferedOutputStream bos = new BufferedOutputStream(fos);
字符流（文本，只能是gbk格式）
FileReader fr = new FileReader("Demo.java"); //输入
FileWriter fw = new FileWriter("Copy.java"); //输出
//BufferedReader br = new BufferedReader(fr); //缓冲流
//BufferedWriter bw = new BufferedWriter(fw); //高效
转换流（字节流 指定编码转 字符流）
FileInputStream fis = new FileInputStream("F:\utf-8.txt");
//FileInputStream fis = System.in; //控制台键盘录入
InputStreamReader isr = new InputStreamReader(fis,"utf-8");//默认gbk
//FileReader fr = new InputStreamReader(fis,"utf-8"); //多态
FileOutputStream fos = new FileOutputStream("F:\utf-8.txt",true);
OutputStreamWriter osw=new OutputStreamWriter(fos,"utf-8");//转换流
//FileWriter fw =new OutputStreamWriter(fos,"utf-8"); //多态
//一次读写一个字节 //字符
int ch;
while((ch=br.read())!=-1) {
bw.write(ch); //fw.flush();
//System.out.print((char)ch); // 转字符
}
//一次读写一个字符数组 // 字节数组
char[] chs = new char[1024]; //byte[] bytes=new byte[1024];
int len;
while((len=br.read(chs))!=-1) { //(bytes)
bw.write(chs,0,len);
//System.out.print(new String(chs,0,len));//字节数组转字符串
}
//一次读写一行（字符串）字符缓冲流特有
String line;
while((line=br.readLine())!=null){ //br.readLine()一次读一行
bw.write(line);//System.out.println(line);
bw.newLine();//写入系统换行符
bw.flush();//刷新
}
//释放资源 用什么读写 用什么关
bw.close(); //bw>fw bos>fos osw>fos
br.close();
}