DispatcherServlet - Completed 404 NOT_FOUND

求大佬帮解决一下！！！

最近老是碰到这个问题，配置都是照着视频敲的，但有时候访问就是404错误，定位不到问题。

web.xml配置

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
         version="3.1">
    <servlet>
        <servlet-name>springmvc</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>classpath:applicationContext*.xml</param-value>
        </init-param>
        <load-on-startup>0</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>springmvc</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>

    <!--    4.解决post请求中文乱码-->
    <filter>
        <filter-name>characterFilter</filter-name>
        <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
        <init-param>
            <param-name>encoding</param-name>
            <param-value>UTF-8</param-value>
        </init-param>
    </filter>
    <filter-mapping>
        <filter-name>characterFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>
</web-app>

applicationContext.xml配置

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:mvc="http://www.springframework.org/schema/mvc"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:task="http://www.springframework.org/schema/task"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
            http://www.springframework.org/schema/beans/spring-beans.xsd
            http://www.springframework.org/schema/context
            http://www.springframework.org/schema/context/spring-context.xsd
            http://www.springframework.org/schema/task
            http://www.springframework.org/schema/task/spring-task.xsd
            http://www.springframework.org/schema/mvc
            http://www.springframework.org/schema/mvc/spring-mvc.xsd">
    <!--    3.开启springMVC框架开启注解模式-->
    <context:component-scan base-package="com.imooc"/>
    <mvc:annotation-driven>
        <mvc:message-converters>
            <bean class="org.springframework.http.converter.StringHttpMessageConverter">
                <property name="supportedMediaTypes">
                    <list>
                        <value>text/html;charset=utf-8</value>
                        <value>application/json;charset=utf-8</value>
                    </list>
                </property>
            </bean>
        </mvc:message-converters>
    </mvc:annotation-driven>
    <mvc:default-servlet-handler/>

    <!--    5.配置Freemarker模板引擎-->
     <bean id="freemarkerConfig" class="org.springframework.web.servlet.view.freemarker.FreeMarkerConfigurer">
         <property name="templateLoaderPath" value="/WEB-INF/ftl"/>
         <property name="freemarkerSettings">
             <props>
                 <prop key="defaultEncoding">UTF-8</prop>
             </props>
         </property>
     </bean>
    <bean id="ViewResolver" class="org.springframework.web.servlet.view.freemarker.FreeMarkerViewResolver">
        <property name="contentType" value="text/html;charset=utf-8"/>
        <property name="suffix" value=".ftl"/>
    </bean>
</beans>

TestController.java

package com.imooc.reader.controller;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.servlet.ModelAndView;

import java.util.HashMap;
import java.util.Map;

@Controller
public class TestController {
    @GetMapping("/t")
    @ResponseBody
    public String test3() {
        return "HelloWorld";
    }

    @GetMapping("/test/t1")
    public ModelAndView test1() {
        return new ModelAndView("/test");
    }

    @GetMapping("/test/t2")
    @ResponseBody
    public Map test2() {
        Map result = new HashMap();
        result.put("test", "测试文本");
        return result;
    }
}

tomcat配置

运行效果

404是请求无法解析
你仔细看看你的路径映射配置

DispatcherServlet里面打个断点看看

看tomcat配置的deployment选项卡中，有没有默认项目名称

楼主还能记起是哪出现了问题吗？我现在碰到一样的问题但是不知道哪错了。
更奇葩的是我上午运行出来了，晚上又错了！
人都麻了