TomcatSpringmvc-404错误。出现哪些错误？

1. 确认web.xml文件中已经配置了DispatcherServlet，并且servlet-mapping路径设置正确，如下所示：

<servlet>
    <servlet-name>dispatcher</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    <init-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>/WEB-INF/dispatcher-servlet.xml</param-value>
    </init-param>
    <load-on-startup>1</load-on-startup>
</servlet>

<servlet-mapping>
    <servlet-name>dispatcher</servlet-name>
    <url-pattern>/</url-pattern>
</servlet-mapping>

2. 确认dispatcher-servlet.xml已经配置了扫描Controller的包路径，并且Controller类上使用了@Controller注解，方法上使用@RequestMapping注解，如下所示：

<context:component-scan base-package="com.example.controller" />

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

@Controller
@RequestMapping("/hello")
public class HelloController {
    @RequestMapping(method = RequestMethod.GET)
    public String hello(ModelMap model) {
        model.addAttribute("message", "Hello Spring MVC Framework!");
        return "hello";
    }
}

3. 如果以上两个步骤都正确，但还是出现404错误，则需要检查是否需要在项目部署路径前加上项目名称。例如，项目名为myproject，则应该访问的URL为：http://localhost:8080/myproject/hello

<servlet-mapping>
    <servlet-name>dispatcher</servlet-name>
    <url-pattern>/myproject/*</url-pattern>
</servlet-mapping>

@Controller
@RequestMapping("/myproject/hello")
public class HelloController {
    @RequestMapping(method = RequestMethod.GET)
    public String hello(ModelMap model) {
        model.addAttribute("message", "Hello Spring MVC Framework!");
        return