springmvc搭建环境时报No mapping found for HTTP request with URI [/exam3/welcome] in DispatcherServlet with _dispatcher

当筵意气临九霄，星离雨散不终朝。这篇文章主要讲述springmvc搭建环境时报No mapping found for HTTP request with URI [/exam3/welcome] in DispatcherServlet with相关的知识，希望能为你提供帮助。
项目是使用spring MVC
（1）在浏览器中访问，后台总报错：
java代码

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No mapping found for HTTP request with URI [/exam3/welcome] in DispatcherServlet with name ‘spring2‘

查了好半天，才发现是controller 没有扫描到。
我是使用的注解。
spring mvc配置文件如下：
Xml代码

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< ?xml version="1.0" encoding="UTF-8"?>
< beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context"
xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.2.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-3.2.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop-3.2.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx-3.2.xsd
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd"
>
< !-- HandlerMapping -->
< bean
class="org.springframework.web.servlet.handler.BeanNameUrlHandlerMapping" />
< !-- HandlerAdapter -->
< bean
class="org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter" />
< !-- ViewResolver -->
< bean
class="org.springframework.web.servlet.view.InternalResourceViewResolver">
< property name="viewClass"
value="https://www.songbingjia.com/android/org.springframework.web.servlet.view.JstlView" />
< property name="prefix" value="https://www.songbingjia.com/WEB-INF/jsp/" />
< property name="suffix" value="https://www.songbingjia.com/android/.jsp" />
< /bean>
< mvc:annotation-driven />
< !-- 处理器 -->
< !-- < bean name="/hello" class="com.mvc.jn.controller.HelloWorldController"/> -->
< context:component-scan base-package="com"/>
< /beans>

controller 的目录结构如下：

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（2）这个问题解决之后，又报错：
No mapping found for HTTP request with URI [/exam3/WEB-INF/jsp/welcome.jsp] in DispatcherServlet with name ‘spring2‘
结果发现是web.xml配置得有问题，下面是有问题的：
Xml代码

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< servlet>
< servlet-name> spring2< /servlet-name>
< servlet-class> org.springframework.web.servlet.DispatcherServlet< /servlet-class>
< load-on-startup> 1< /load-on-startup>
< /servlet>
< servlet-mapping>
< servlet-name> spring2< /servlet-name>
< url-pattern> /*< /url-pattern>
< /servlet-mapping>