springmvc mybatis mysql blob中文乱码问题处理

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<select id="queryContentById"  resultType = "java.lang.String"  parameterType="String"  >

        select text from News where id=#{o} 

</select>

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byte[] b = (byte[]) map.get("text");

String s = new String(b,"utf-8");

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@RequestMapping(value = "/queryContentById", method = RequestMethod.GET,produces = "text/plain;charset=UTF-8")

public @ResponseBody String queryContentById(@RequestParam("id") String id) throws SQLException, UnsupportedEncodingException {

    Map map = (Map) ndrService.queryContentById(id);

    byte[] b = (byte[]) map.get("text");

    String s = new String(b,"utf-8");

    return s;

}