I find the error.My config is error. Use this is OK!
<build>
<plugins>
<plugin>
<groupId>org.mortbay.jetty</groupId>
<artifactId>jetty-maven-plugin</artifactId>
<version>8.1.0.v20120127</version>
<configuration>
<scanIntervalSeconds>10</scanIntervalSeconds>
<webApp>
<contextPath>/mideaAdmin</contextPath>
</webApp>
<connectors>
<connector implementation="org.eclipse.jetty.server.nio.SelectChannelConnector">
<port>9999</port>
<maxIdleTime>60000</maxIdleTime>
</connector>
</connectors>
<stopPort>8191</stopPort>
<stopKey>ts</stopKey>
</configuration>
<executions>
<execution>
<id>start-jetty</id>
<phase>install</phase>
<goals>
<goal>run</goal>
</goals>
</execution>
</executions>
</plugin>
</plugins>
<finalName>mideaAdmin</finalName>
</build>