配置的事务管理器，只有在controller中调用含事务的方法，才起作用
如：
@Controller
@RequestMapping("xxx/xxx")
public class xxxAction
@RequestMapping("test")
@ResponseBody
public Result test(HttpServletRequest request) {
Result result = new Result();
try {
result = productService.testTransactional()
} catch (Exception e) {
} return result;}
