老師想問一下，我用main函數測試DBAccess類時沒問題，但是發(fā)布之后總是讀取不到文件這是DBAccess類

package?com.lichunting.db;

import?java.io.IOException;
import?java.io.Reader;

import?org.apache.ibatis.io.Resources;
import?org.apache.ibatis.session.SqlSession;
import?org.apache.ibatis.session.SqlSessionFactory;
import?org.apache.ibatis.session.SqlSessionFactoryBuilder;


/**
?*?訪問數據庫
?*?@author?LiChunting
?*
?*/
public?class?DBAccess?{
	public??SqlSession?getSqlSession()?throws?IOException{
		//通過配置文件獲取數據庫連接信息
		Reader?reader?=?Resources.getResourceAsReader("com/lichunting/config/Configuration.xml");
		//通過配置信息構建一個SqlSessionFactory
		SqlSessionFactory?sqlSessionFactory?=?new?SqlSessionFactoryBuilder().build(reader);
		//通過sqlSessionFactory打開一個數據庫會話
		SqlSession?sqlSession?=?sqlSessionFactory.openSession();
		return?sqlSession;
	}
	
	
}

這是錯誤

Servlet.service()?for?servlet?[ListServlet]?in?context?with?path?[/WeChat]?threw?exception?[Servlet?execution?threw?an?exception]?with?root?cause
java.lang.ClassNotFoundException:?org.apache.ibatis.io.Resources
	at?org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1714)
	at?org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1559)
	at?com.lichunting.db.DBAccess.getSqlSession(DBAccess.java:20)
	at?com.lichunting.dao.MessageDao.queryMessageList(MessageDao.java:31)
	at?com.lichunting.service.ListService.queryMessageList(ListService.java:12)
	at?com.lichunting.servlet.ListServlet.doGet(ListServlet.java:33)
	at?javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
	at?javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
	at?org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
	at?org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
	at?org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)
	at?org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
	at?org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
	at?org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:168)
	at?org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)
	at?org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
	at?org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407)
	at?org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1002)
	at?org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:585)
	at?org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:310)
	at?java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:895)
	at?java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:918)
	at?java.lang.Thread.run(Thread.java:662)