javax.servlet.ServletException: java.lang.IllegalStateException: No WebEnvironment found: no Environ

在使用shiro的时候报异常

严重: Exception starting filter ShiroFilter
javax.servlet.ServletException: java.lang.IllegalStateException: No WebEnvironment found: no EnvironmentLoaderListener registered?
	at org.apache.shiro.web.servlet.AbstractFilter.init(AbstractFilter.java:105)
	at org.apache.catalina.core.ApplicationFilterConfig.getFilter(ApplicationFilterConfig.java:298)
	at org.apache.catalina.core.ApplicationFilterConfig.(ApplicationFilterConfig.java:119)
	at org.apache.catalina.core.StandardContext.filterStart(StandardContext.java:4142)
	at org.apache.catalina.core.StandardContext.start(StandardContext.java:4800)
	at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1061)
	at org.apache.catalina.core.StandardHost.start(StandardHost.java:822)
	at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1061)
	at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:463)
	at org.apache.catalina.core.StandardService.start(StandardService.java:525)
	at org.apache.catalina.core.StandardServer.start(StandardServer.java:761)
	at org.apache.catalina.startup.Catalina.start(Catalina.java:595)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
	at java.lang.reflect.Method.invoke(Unknown Source)
	at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:289)
	at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:414)
Caused by: java.lang.IllegalStateException: No WebEnvironment found: no EnvironmentLoaderListener registered?
	at org.apache.shiro.web.util.WebUtils.getRequiredWebEnvironment(WebUtils.java:277)
	at org.apache.shiro.web.servlet.ShiroFilter.init(ShiroFilter.java:73)
	at org.apache.shiro.web.servlet.AbstractShiroFilter.onFilterConfigSet(AbstractShiroFilter.java:152)
	at org.apache.shiro.web.servlet.AbstractFilter.init(AbstractFilter.java:97)
	... 17 more

是因为在web.xml中没有加入shiro的监听

解决办法：在web.xml中加入

  org.apache.shiro.web.env.EnvironmentLoaderListener