Incorrect column count: expected 1, actual 2

        String sql="SELECT t.industry_code AS item, COUNT (1) AS intValue FROM company_info t GROUP BY industry_code";
        List<LineChartShowBean> pollutionCityBeans = trJdbcTemplate.queryForList(sql, LineChartShowBean.class);

queryForList的第二个参数Class<T> elementType仅仅是Integer,String之类的数据类型，使用如下方法可以获得自己想要的结果：

String sql="SELECT t.industry_code AS item, COUNT (1) AS intValue FROM company_info t GROUP BY industry_code";

List<LineChartShowBean> list = trJdbcTemplate.query(sql,
        new BeanPropertyRowMapper<>(LineChartShowBean.class));