springmvc不能进入controller、后台也不报错解决思路

一：检查是否配置了处理器映射器、处理器适配器

  <mvc:annotation-driven />

二：是否配置了扫描 controller包

<context:component-scan base-package="cn.ssm.controller" />

三：controller类是否加上了@contaoller注解

@Controller
public class ItemController {

    @Autowired
    private ItemService itemService;
    @RequestMapping("/item/{itemId}")
    @ResponseBody
    public TbItem getItemById(@PathVariable Long itemId) {
        System.err.println(123);
        TbItem tbItem = itemService.getItemById(itemId);
        return tbItem;
    }
}

四：视图解析器是否配置正确

   <bean
        class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/WEB-INF/jsp/" />
        <property name="suffix" value=".jsp" />
    </bean>

五、web.xml文件是否配置了springmvc文件启动

<!-- springmvc的前端控制器 -->
    <servlet>
        <servlet-name>springmvc</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <!-- contextConfigLocation不是必须的， 如果不配置contextConfigLocation， springmvc的配置文件默认在：WEB-INF/servlet的name+"-servlet.xml" -->
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>classpath:spring/springmvc.xml</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>springmvc</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>