转换流 ------ OutputStreamWriter 类与 InputStreamReader 类

OutputStreamWriter：是 Writer 的子类，将输出的字节变为字符流，即将一个字符流的输出对象变为字节流的输出对象
InputStreamReader：是 Reader 的子类，将输入的字节变为字符流，即将一个字节流的输入对象变为字符流的输入对象

1 、将字节输出流变为字符输出流

public class OutputStreamWriterDemo01 {
    public static void main(String[] args) {
    File file = new File("e:" + File.separator + "test.txt");try {
    Writer out = new OutputStreamWriter(new FileOutputStream(file));out.write("hello world");out.close();} catch (Exception e) {
    e.printStackTrace();}}
}

2 、将字节输入流变为字符输入流

public class InputStreamReaderDemo {
    public static void main(String[] args) {
    File file = new File("e:" + File.separator + "test.txt");try {
    Reader input = new InputStreamReader(new FileInputStream(file));char[] c = new char[(int) file.length()];input.read(c);input.close();System.out.println("内容为：" + new String(c));} catch (Exception e) {
    e.printStackTrace();}}
}