POM文件配置

<!-- http://mvnrepository.com/artifact/dom4j/dom4j -->
        <dependency>
            <groupId>dom4j</groupId>
            <artifactId>dom4j</artifactId>
            <version>1.6.1</version>
        </dependency>

下载成功了
头部报错，更新项目也不行

ArtifactTransferException: Failure to transfer xml-apis:xml-apis:jar:1.0.b2 from 
http://repo.maven.apache.org/maven2 was cached in the local repository, 
resolution will not be reattempted until the update 
 interval of central has elapsed or updates are forced. Original error: Could not transfer artifact 
xml-apis:xml-apis:jar:1.0.b2 from/to central (http://repo.maven.apache.org/maven2): connection timed out to 
 http://repo.maven.apache.org/maven2/xml-apis/xml-apis/1.0.b2/xml-apis-1.0.b2.jar