Server Tomcat v7.0 Server at localhost was unable to start within 45 seconds. If the server requires more time, try increasing the timeout in the server editor.

在部署的时候出现Server Tomcat v7.0 Server at localhost was unable to start within 45 seconds. If the server requires more time, try increasing the timeout in the server editor.
也就是我们限定了部署的时间导致的错误，经过在网上的查找，找到了以下的解决方案：

我们找到当前工程的workplace目录，然后按下面的操作：
找到workspace\.metadata\.plugins\org.eclipse.wst.server.core\servers.xml文件。
<servers>
<server auto-publish-setting="2" auto-publish-time="1" configuration-id="/Servers/Tomcat v7.0 Server at localhost-config" deployDir="wtpwebapps" hostname="localhost" id="Tomcat v6.0 Server at localhost" name="Tomcat v7.0 Server at localhost" runtime-id="Apache Tomcat v7.0" server-type="org.eclipse.jst.server.tomcat.60" server-type-id="org.eclipse.jst.server.tomcat.70" start-timeout="45" stop-timeout="15" testEnvironment="true" timestamp="3"/>
</servers>

把 其中的start-timeout="45" 改为  start-timeout="100" 或者更长，根据不同同学的工程大小来设置。
最后重启eclipse就可以了。