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();
     }
 }