@Test

public void test1(){

    File file = new File("hello.txt");

    FileReader fr = null;

    try {

        fr = new FileReader(file);

        //返回读取的内容

        int data;

        while ((data = fr.read()) != -1){

            System.out.print((char)data);

        }

    } catch (FileNotFoundException e) {

        e.printStackTrace();

    } catch (IOException e) {

        e.printStackTrace();

    }finally {

        if (fr != null){

            try {

                fr.close();

            } catch (IOException e) {

                e.printStackTrace();

            }

        }

    }

}