maven 仓库地址：
共有的仓库
http://repo1.maven.org/maven2/
http://repository.jboss.com/maven2/
http://repository.sonatype.org/content/groups/public/
http://mirrors.ibiblio.org/pub/mirrors/maven2/org/acegisecurity/
私有的仓库
http://repository.codehaus.org/
http://snapshots.repository.codehaus.org/
http://people.apache.org/repo/m2-snapshot-repository
http://people.apache.org/repo/m2-incubating-repository/