如何将一个用utf-8编码的文本用java程序转换成ANSI编码的文本

jdk有一个关于UTF-8的bug
所以加了一句 br.skip(1);

bugID：

http://bugs.java.com/view_bug.do?bug_id=4508058

public static void main(String[] args) {
    StringBuffer buffer=new StringBuffer();
    try {
        FileInputStream fis=new FileInputStream("test.txt");
        InputStreamReader isr=new InputStreamReader(fis,"UTF-8");
        BufferedReader br=new BufferedReader(isr);
        String line=null;
        br.skip(1);
        while ((line=br.readLine())!=null) {
            buffer.append(line);
            buffer.append("
");
        }
        buffer.delete(buffer.length()-2,buffer.length());
        br.close();
    } catch (Exception e) {
        e.printStackTrace();
    }
    System.out.println(buffer);
    try {
        FileOutputStream fos=new FileOutputStream("test1.txt");
        OutputStreamWriter osw=new OutputStreamWriter(fos);
        osw.write(buffer.toString());
        osw.flush();
        osw.close();
    } catch (Exception e) {
        e.printStackTrace();
    }
}