Maven实现项目构建直接部署Web项目到Tomcat配置如下：
1.Tomcat的用户及权限配置：在conf目录下，找到tomcat-users.xml，添加manager权限的用户。
<role rolename="admin-gui"/>
<role rolename="admin-script"/>
<role rolename="manager-gui"/>
<role rolename="manager-script"/>
<role rolename="manager-jmx"/>
<role rolename="manager-status"/>
<user username="admin" password="admin" roles="manager-gui,manager-script,manager-jmx,manager-status,admin-script,admin-gui"/>
<server>
<id>tomcat</id>
<username>admin</username>
<password>admin</password>
</server>
<plugin>
<groupId>org.apache.tomcat.maven</groupId>
<artifactId>tomcat7-maven-plugin</artifactId>
<version>2.2</version>
<configuration>
<!-- 注意tomcat7此处的url -->
<url>http://localhost:8080/manager/text</url>
<!-- 此处的名字必须和setting.xml中配置的ID一致-->
<server>tomcat</server>
<!-- 此处的名字是项目发布的工程名-->
<path>/ui</path>
</configuration>
</plugin>
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>tomcat-maven-plugin</artifactId>
<version>1.1</version>
<configuration>
<!-- 注意tomcat此处的url -->
<url>http://localhost:8080/manager/html</url>
<!-- 此处的名字必须和setting.xml中配置的ID一致-->
<server>tomcat</server>
<!-- 此处的名字是项目发布的工程名-->
<path>/ui</path>
</configuration>
</plugin>
4.最后，进入项目pom.xml文件所在的目录执行maven命令：mvn tomcat7:deploy就可以了（必须事先启动tomcat服务器）；在eclipse下maven项目构建自动部署web项目到tomcat如图：
初次部署用的是tomcat7:deploy命令，重新部署可以用tomcat7:redeploy命令（推荐统一用这个），Tomcat Maven插件支持的命令包括：run、shutdown、run-war-only、exec-war、standalone-war-only、deploy、standalone-war、undeploy、run-war、redeploy等。
注意：如果是tomcat6则命令如下：mvn tomcat:deploy；如果是tomcat7或者tomcat8命令：mvn tomcat7:deploy
5.最后日志如下表示部署成功：[INFO] --- tomcat7-maven-plugin:2.2:redeploy (default-cli) @ ui ---
[INFO] Deploying war to http://172.16.100.177:9098/ui
Uploading: http://172.16.100.177:9098/manager/text/deploy?path=%2Fui&update=true
Uploaded: http://172.16.100.177:9098/manager/text/deploy?path=%2Fui&update=true (48931 KB at 11801.8 KB/sec)
[INFO] tomcatManager status code:200, ReasonPhrase:OK
[INFO] OK - Deployed application at context path /ui
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 01:02 min
[INFO] Finished at: 2016-12-10T14:37:43+08:00
[INFO] Final Memory: 16M/98M
[INFO] ------------------------------------------------------------------------