java自动识别乱码转换

String keyword = pd.getString("keyWord");

if( keyword != null && !"".equals(keyword)){
if(null != keyword && !(java.nio.charset.Charset.forName("GBK").newEncoder().canEncode(keyword))){
   try {
    keyword = new String(keyword.getBytes("ISO-8859-1"),"UTF-8");
   } catch (UnsupportedEncodingException e) {
    e.printStackTrace();
 }    
} 

sql += " and (lx.qjlxmc like '"+keyword+"%' or  sqxx.qjsy like '%"+keyword+"%')";
}