转换流

  • 初始化变量

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    private static final String FILENAME = "E:" + File.separator + "hello.txt";

字节输出流转换为字符输出流

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private static void testWriter() {
    File file = new File(FILENAME);
    try {
        Writer writer = new OutputStreamWriter(new FileOutputStream(file));
        writer.write("Today is sunday.");
        writer.close();
    } catch (IOException e) {
        e.printStackTrace();
    }
}

字节输入流转换为字符输入流

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private static void testReader() {
    File file = new File(FILENAME);
    try {
        Reader reader = new InputStreamReader(new FileInputStream(file));
        char[] chars = new char[100];
        int length = reader.read(chars);
        reader.close();
        System.out.println("读取长度：" + length);
        System.out.println("读取内容：" + new String(chars));
    } catch (IOException e) {
        e.printStackTrace();
    }
}