tomcat启动java web项目为什么抛出异常：java.lang.ClassNotFoundException: org.springframework.web.filter.CharacterEncodingFilter?

严重: Exception starting filter encoding

java.lang.ClassNotFoundException: org.springframework.web.filter.CharacterEncodingFilter

tomcat可以启动

我的web.xml

01<?xml version="1.0" encoding="UTF-8"?>
02<web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee"
03 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
04 xsi:schemaLocation="http://java.sun.com/xml/ns/javaee   http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
05 
06 <servlet>
07  <servlet-name>springMvc</servlet-name>
08  <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
09  <init-param>
10      <param-name>contextConfigLocation</param-name>
11      <param-value>classpath:springMvc.xml</param-value>
12  </init-param>
13 </servlet>
14 <servlet-mapping>
15  <servlet-name>springMvc</servlet-name>
16  <url-pattern>*.do</url-pattern>
17 </servlet-mapping>
18   <filter>
19   <filter-name>encoding</filter-name>
20   <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
21   <init-param>
22     <param-name>encoding</param-name>
23     <param-value>UTF-8</param-value>
24   </init-param>
25 </filter> 
26 <filter-mapping>
27   <filter-name>encoding</filter-name>
28   <url-pattern>/*</url-pattern>
29 </filter-mapping>
30 <welcome-file-list>
31  <welcome-file>login.jsp</welcome-file>
32 </welcome-file-list>
33 <login-config>
34  <auth-method>BASIC</auth-method>
35 </login-config>
36</web-app>