（1）在浏覽器中通路，背景總報錯：
no mapping found for http request with uri [/exam3/welcome] in dispatcherservlet with name 'spring2'
查了好半天，才發現是controller 沒有掃描到。
我是使用的注解。
spring mvc配置檔案如下：
<?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 -->
class="org.springframework.web.servlet.mvc.simplecontrollerhandleradapter" />
<!-- viewresolver -->
class="org.springframework.web.servlet.view.internalresourceviewresolver">
<property name="viewclass"
value="org.springframework.web.servlet.view.jstlview" />
<property name="prefix" value="/web-inf/jsp/" />
<property name="suffix" value=".jsp" />
</bean>
<mvc:annotation-driven />
<!-- 處理器 -->
<!-- <bean name="/hello" class="com.mvc.jn.controller.helloworldcontroller"/> -->
<context:component-scan base-package="com"/>
</beans>
controller 的目錄結構如下：
（2）這個問題解決之後，又報錯：
no mapping found for http request with uri [/exam3/web-inf/jsp/welcome.jsp] in dispatcherservlet with name 'spring2'
結果發現是web.xml配置得有問題，下面是有問題的：
<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>
<url-pattern>/*</url-pattern>
</servlet-mapping>
解決方法：把url-pattern 由/* 改為/