Java inputStream学习

public class FileInputStreamDemo {
    public static void main(String[] args) {

    }

    /**
     * 单个字节读取，效率低
     */
    @Test
    public void readFile01() {
        String filePath = "D:\\test\\inputStream\\hello.txt";
        int readData = 0;
        try (FileInputStream inputStream = new FileInputStream(filePath)) { //字节流，读中文会乱码
            while ((readData = inputStream.read()) != -1) { //-1代表读入结束
                System.out.print((char) readData);
            }
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }

    /**
     * read(byte[])字节读取，效率高
     */
    @Test
    public void readFile02() {
        String filePath = "D:\\test\\inputStream\\hello.txt";
        int readData = 0;
        int bufLen;
        byte[] buf = new byte[8]; // 字节数组
        try (FileInputStream inputStream = new FileInputStream(filePath)) { //字节流，读中文会乱码
            while ((bufLen = inputStream.read(buf)) != -1) { //将数据读入到buf中去
                //最后一次读入的有效数据长度，不一定等于buf.length，所以得用bufLen响应式控制
                System.out.print(new String(buf, 0, bufLen)); 
            }
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }
}