是不是需要用con创建个Statement或PreparedStatement对象,再用这个对象执行executeQuery? Statement stat = con.createStatement(); ResultSet rs = stat.executeQuery(sql); 记得即使没取到数据rs也不是空来着.你的con如果是Connection的话就创建个Statement或PreparedStatement对象.最好把封装的代码也发下. 把ResultSet rs=con.executeQuery(sql);改成上面两句试过了没啊?
if rs.nextorg.apache.jasper.JasperException:An exception occ
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