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("\r\n");

         }

         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();

     }

 }