Maven运行web项目无法加载resource目录中配置文件：报错

Maven项目tomcat:run的方式运行取不到resource目录下配置文件

<build>
    <finalName>pointexchange</finalName>
	<plugins>
		<plugin>
			<groupId>org.codehaus.mojo</groupId>
			<artifactId>tomcat-maven-plugin</artifactId>
			<version>1.0-beta-1</version>
			<configuration>
				<url>http://localhost:8080/manager/html</url>
				<server>tomcat6</server>
			</configuration>
		</plugin>
		<plugin>
			<groupId>org.apache.maven.plugins</groupId>
			<artifactId>maven-compiler-plugin</artifactId>
			<version>2.1</version>
			<configuration>
				<source>1.6</source>
				<target>1.6</target>
			</configuration>
		</plugin>

String filePath = "/config.propites";
InputStream in = PropertiesUtil.class.getClassLoader().getResourceAsStream(filePath);