后台返回前台为字符串乱码问题

    /**
     * 根据商品分类的Id查询名称
     * @ResponseBody进行数据解析时,如果解析的是对象(pojo/vo/List/Map..)
     * 默认格式都采用utf-8格式解析.
     * 如果解析的数据是String类型,则按照iso-8859-1格式进行解析.
     * public class StringHttpMessageConverter extends AbstractHttpMessageConverter<String> {
       public static final Charset DEFAULT_CHARSET = Charset.forName("ISO-8859-1");
    
       public abstract class AbstractJackson2HttpMessageConverter extends AbstractHttpMessageConverter<Object>
       public static final Charset DEFAULT_CHARSET = Charset.forName("UTF-8");
     * @param itemId
     * @return
     */
    @RequestMapping(value="/cat/queryItemName",produces="text/html;charset=utf-8")
    @ResponseBody
    public String findItemCatNameById(String itemId,HttpServletResponse response){
        
        //response.setContentType("text/html;charset=utf-8");
        return itemService.findItemCatNameById(itemId);
    }