转换流的案例：

1，将GBK转换为UTF-8

public class Text01 {
    public static void main(String[] args) throws IOException {
        InputStreamReader isr = new InputStreamReader(new FileInputStream("G:\\xxx\\GBK.txt"),"GBK");
        OutputStreamWriter osw = new OutputStreamWriter(new FileOutputStream("G:\\xxx\\UTF-8.txt"),"UTF-8");
        char[] chars = new char[1024 * 8];
        int length;
        while ((length = isr.read(chars)) != -1){
            osw.write(chars,0,length);
        }
        osw.close();
        isr.close();
    }
}