基于maven的问题

最近创建了一个Maven 的web项目，导入eclipse中后，pom.xml文件一直报如下错误

Failure to transfer org.codehaus.plexus:plexus-archiver:pom:1.0 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 org.codehaus.plexus:plexus- archiver:pom:1.0 from/to central (http://repo.maven.apache.org/maven2): connection timed out to http://repo.maven.apache.org/maven2/org/codehaus/plexus/ plexus-archiver/1.0/plexus-archiver-1.0.pom
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后来查看网上资料，好多都说用如下方法解决

1. 先去掉Maven工程的maven特性，选中工程 鼠标右键–>Maven–>Disable Maven Nature
2. 为工程增加Maven特性,选中工程 鼠标右键–>Configure–>Convert to Maven Project

亲测没有解决问题，后来无奈就去maven仓库下载了plexus-archiver-1.0.jar放在本地maven仓库中，本想应该可以了结果又报

Failure to transfer org.codehaus.plexus:plexus-archiver:jar:1.2 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 org.codehaus.plexus:plexus- archiver:jar:1.2 from/to central (http://repo.maven.apache.org/maven2): No response received after 60000
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同样又把plexus-archiver-1.2.jar下载放在本地maven仓库中，结果又报

Failure to transfer org.codehaus.plexus:plexus-io:jar:1.0.1 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 org.codehaus.plexus:plexus-io:jar: 1.0.1 from/to central (http://repo.maven.apache.org/maven2): No response received after 60000
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我也是醉了，然后又把plexus-io-1.0.1.jar下载了放在本地maven仓库中，然后alt+F5刷新项目终于好了。本问题中所用到的maven仓库地址为http://search.maven.org/#browse%7C-1852552255，三个jar包快捷下载地址为http://download.csdn.net/detail/gao36951/8804939

在maven 的setting.xml文件中找到<mirrors>添加如下内容

<mirror><id>alimaven</id><mirrorOf>central</mirrorOf><name>aliyun maven</name><url>http://maven.aliyun.com/nexus/content/repositories/central/</url></mirror><!-- 阿里云仓库 -->
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Maven设置添加阿里云仓库， 然后重启ecplise，更新项目，问题解决

新建jsp页面老提示：

Multiple annotations found at this line:

  - The superclass "javax.servlet.http.HttpServlet" was not found on the Java   Build Path

解决步骤：

1、右键项目-build path

2、选择configure build path...

3、选择 Java build path

4、Add Library –> server Runtime -> Click Next

5、选择  Server runtime (我的是 Tomcat 7.0) –>完成