各种坑啊

坑1：
Failed to execute goal org.apache.tomcat.maven:tomcat7-maven-plugin:2.1:run (default-cli) on project travel: Could not start Tomcat
原因:可能是某个servlet的例如这个@WebServlet(“category/*”)写错了
坑2
引入resource下的druid.properties的时候必要
InputStream is = JDBCUtils.class.getClassLoader().getResourceAsStream(“druid.properties”);