maven项目在tomcat7/8上的热部署

    <role rolename="manager-gui" />
    <role rolename="manager-script" />
    <user username="tomcat7" password="tomcat7" roles="manager-gui, manager-script" />

<plugin>
        <groupId>org.apache.tomcat.maven</groupId>
        <artifactId>tomcat7-maven-plugin</artifactId>
        <version>2.2</version>
        <configuration>
            <url>http://localhost:8080/manager/text</url>
               <path>/</path>
              <server>tomcat8</server>
              <username>tomcat</username>
              <password>tomcat</password>
        </configuration>
      </plugin>

    <dependency>
            <groupId>org.apache.tomcat</groupId>
            <artifactId>tomcat-servlet-api</artifactId>
            <version>8.5.4</version>
    </dependency>