最近在做一个项目练习  遇到No mapping found for HTTP request with URI [/] in DispatcherServlet with name 'taotao-manager
'问题  报404错误 项目主要结构配置文件 application-dao.xml
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:context="http://www.springframework.org/schema/context" xmlns:p="http://www.springframework.org/schema/p"
xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.0.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd
http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.0.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.0.xsd
http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-4.0.xsd">
<!-- 加载配置文件 -->
<context:property-placeholder location="classpath:resource/*.properties"/>
<!-- 数据库连接池 -->
<bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource" destroy-method="close">
     <property name="url" value="${jdbc.url}"></property>
      <property name="username" value="${jdbc.username}"></property>
      <property name="password" value="${jdbc.password}"></property>
      <property name="driverClassName" value="${jdbc.driver}"></property>
      <property name="maxActive" value="10"></property>
       <property name="minIdle" value="5"></property>
</bean>
<!-- 配置SqlSessionFactory -->
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
    <!-- 加载mybatis的配置文件 -->
        <property name="configLocation" value="classpath:mybatis/SqlMapConfig.xml"></property>
        <property name="dataSource" ref="dataSource"></property></bean><!-- 配置包扫描器 扫描mapper接口生成代理对象放到spring容器中 -->
  <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
  <property name="basePackage" value="com.taotao.mapper"></property>
  
  </bean>
</beans>
application-service.xml
<!-- 配置包扫描器,扫描@Service主键的类 -->
<context:component-scan base-package="com.taotao.service*"/>
application-trans.xml
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:context="http://www.springframework.org/schema/context" xmlns:p="http://www.springframework.org/schema/p"
xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.0.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd
http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.0.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.0.xsd
http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-4.0.xsd">
<!-- 事务管理 -->
   <!-- 事务管理器 -->
      <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <!-- 数据源 -->
        <property name="dataSource" ref="dataSource"></property>
        </bean>
   <!-- 通知 -->
       <tx:advice id="txAdvice" transaction-manager="transactionManager">
          <tx:attributes>
       <!-- 传播行为 -->
           <tx:method name="save*" propagation="REQUIRED"/>
           <tx:method name="insert*" propagation="REQUIRED"/>
            <tx:method name="add*" propagation="REQUIRED"/>
             <tx:method name="create*" propagation="REQUIRED"/>
              <tx:method name="delete*" propagation="REQUIRED"/>
               <tx:method name="update*" propagation="REQUIRED"/>
                <tx:method name="find*" propagation="SUPPORTS" read-only="true"/>
                 <tx:method name="select*" propagation="SUPPORTS" read-only="true"/>
                  <tx:method name="get*" propagation="SUPPORTS" read-only="true"/>
         </tx:attributes>
       
       </tx:advice>
        
   <!-- 切面 -->
   <aop:config>
      <aop:advisor advice-ref="txAdvice" pointcut="execution(*com.taotao.service.*.*(..))"/>
   
   </aop:config>
</beans>web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
id="taotao" version="2.5">
<display-name>taotao-manager</display-name>
<welcome-file-list>
<welcome-file>index.html</welcome-file>
<welcome-file>index.htm</welcome-file>
<welcome-file>index.jsp</welcome-file>
<welcome-file>default.html</welcome-file>
<welcome-file>default.htm</welcome-file>
<welcome-file>default.jsp</welcome-file>
</welcome-file-list>
<!-- 加载spring容器 -->
<context-param>
   <param-name>contextConfigLocation</param-name>
   <param-value>classpath:spring/application-*.xml</param-value>
</context-param>
<listener>
    <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
<!-- 解决乱码 -->
<filter>
   <filter-name>CharacterEncodingFilter</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>CharacterEncodingFilter</filter-name>
   <url-pattern>/*</url-pattern>
</filter-mapping>
<!-- 配置前端控制器 -->
<servlet>
   <servlet-name>taotao-manager</servlet-name>
   <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<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>taotao-manager</servlet-name>
   <url-pattern>/*</url-pattern>
</servlet-mapping>
</web-app>package com.taotao.contoller;import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;import com.taotao.pojo.TbItem;
import com.taotao.service.ItemService;
/**
 * 商品管理Controller
 * @author jingyang
 *
 */
@Controller
public class ItemController { @Autowired
private ItemService itemService;
@RequestMapping("/item/{itemId}")
@ResponseBody
public TbItem getItemById(@PathVariable Long itemId){
TbItem tbItem = itemService.getItemById(itemId);
return tbItem;
}
}
在线等大神。