写一个字符编码函数（09-03-27）

/**
*该函数用于字符串编码转换
*@param str
*@param fromEncoding
*@param toEncoding
*@return
*/
private static String getFromToEncoding(String str, String fromEncoding, String toEncoding){
       String rString = "";

       try{
          byte[] bt = str.getBytes(fromEncoding);
          rString = new String(bt, toEncoding);
       }catch(UmsupportedEncodingException ex){
          System.out.println("编码过程中出现错误");
          ex.printStackTrace();
       }
}