POM文件配置<!-- http://mvnrepository.com/artifact/dom4j/dom4j -->        <dependency>            <groupId>dom4j</groupId>            <artifactId>dom4j</artifactId>            <version>1.6.1</version>        </dependency>下載成功了頭部報錯，更新項(xiàng)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