项目第二天

@Service
public class UserService {
    @Autowired
    UserMapper userMapper;

    
    public List doLogin(User user){
        return userMapper.selectByAccount(user);
    }
}

@Controller
@SessionAttributes(value = {"hasUser"},types = {User.class})
public class UserController {
    @Autowired
    UserService userService;

    
    @RequestMapping(value = "/login",method = RequestMethod.POST)
    public String doLogin(User user, Model model){
        List users = userService.doLogin(user);
        if (!users.isEmpty() && users.size()<2){
            for (User user1 : users) {
                System.out.println(user1);
                if (user1.getUserPassword().equals(user.getUserPassword())){
                    model.addAttribute("hasUser","true");
                    return "index";
                }
            }
        }
        return "fail";
    }
    @RequestMapping(value = "toLogin")
    public String toLoginPage(Model model){
        model.addAttribute("hasUser","false");
        return "login";
    }
}

问题：ioc找不到Controller，因为没有service可以注入
进行测试

  @Test
    public void  test02(){
        ApplicationContext ioc = new ClassPathXmlApplicationContext("applicationContext.xml");

        UserMapper mapper = ioc.getBean(UserMapper.class);

        User user1 = new User(null,"",123456,"123456","男","");
        List users = mapper.selectByAccount(user1);

        for (User user : users) {
            System.out.println(user.toString());
        }

        UserService bean = ioc.getBean(UserService.class);
        System.out.println(bean);
        UserController bean1 = ioc.getBean(UserController.class);

        System.out.println(bean1);
    }

发现service已经注册到容器中，而controller没有注册
检查配置文件，applicationContext文件扫描了除controller以外所有包，springmvc-servlet.xml只扫描了controller包，而且两个配置文件都加载了
修改：将applicationContext.xml包扫描改为全部，发现测试可以输出controller，进行项目部署
问题：依旧报controller没有的错
解决：在web.xml文件的启动ioc容器下方加入

 
        org.springframework.web.context.ContextLoaderListener
    

不配置ContextLoaderListener的话，spring默认去这个目录加载/WEB-INF/applicationContext.xml，这也可能是导致之前没有注册controller的错，因为我们的controller是写在springmvc-servlet.xml中的，没加载springmvc-servlet.xml当然没有了，一个下午吃了一个教训。