当发生在如下错误的时候，有一个方案可行，
"java.lang.IllegalStateException: Cannot forward after response has been committed “
当你有多个跳转的页面的语句时候，好好检查一下，当 转发 或者 重定向的时候，需要在后加一个retrun 即可。
服务器中不允许多次跳转，否则会下面这个错误。
因为服务器端使用sendRedirect跳转到客户端的时候,不能在使用req.getRequestDispatcher("跳转的页面").forward(req, reqs);
跳转;
所以在跳转之后，return就不会往下执行。
严重: Servlet.service() for servlet [jsp] in context with path [/TomcatSecurityValidte] threw exception java.lang.IllegalStateException: Cannot forward after response has been committed at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:339) at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:329) at com.pack.security.filter.AuthorizationFilter.doFilter(AuthorizationFilter.java:39) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:224) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175) at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:582) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:164) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100) at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:929) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:405) at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:279) at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:515) at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:302) at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:885) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:907) at java.lang.Thread.run(Thread.java:619)