Servlet3.0动态配置过滤器、监听器、Servlet

Servlet 3.0 作为 Java EE 6 规范体系中一员，随着 Java EE 6 规范一起发布。该版本在前一版本（Servlet 2.5）的基础上提供了若干新特性用于简化 Web 应用的开发和部署。然后本博客就其中的一个特征，动态配置过滤器、监听器、Servlet，进行介绍

<dependency>
	<groupId>javax.servlet</groupId>
	<artifactId>javax.servlet-api</artifactId>
	<scope>provided</scope>
	<version>3.1.0</version>
</dependency>

  
 

  
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实现AbstractAnnotationConfigDispatcherServletInitializer类：

package com.extra.login.core.servlet;

import com.extra.login.cas.client.filter.authentication.AuthenticationFilter;
import com.extra.login.cas.client.filter.session.SingleSignOutFilter;
import com.extra.login.cas.client.util.AssertionThreadLocalFilter;
import com.extra.login.cas.client.util.CasParamKeyEnum;
import com.extra.login.cas.client.util.CasPropertiesLoader;
import com.extra.login.cas.client.util.HttpServletRequestWrapperFilter;
import org.jasig.cas.client.session.SingleSignOutHttpSessionListener;
import org.jasig.cas.client.validation.Cas30ProxyReceivingTicketValidationFilter;
import org.springframework.stereotype.Component;
import org.springframework.web.servlet.support.AbstractAnnotationConfigDispatcherServletInitializer;

import javax.servlet.*;
import java.util.EnumSet;
/**
 * <pre>
 * 基于Servlet3.0实现动态配置过滤器、监听器、Servlet
 * </pre>
 *
 * <pre>
 * @author mazq
 * 修改记录
 * 修改后版本: 修改人：  修改日期: 2020/08/27 14:33  修改内容:
 * </pre>
 */
@Component
public class WebServletInitializer extends AbstractAnnotationConfigDispatcherServletInitializer  { @Override protected Class<?>[] getRootConfigClasses() { return new Class[0]; } @Override protected Class<?>[] getServletConfigClasses() { return new Class[0]; } @Override protected String[] getServletMappings() { return new String[0]; } @Override public void onStartup(ServletContext servletContext) throws ServletException { this.registerCasFilter(servletContext); this.registerCasListener(servletContext); super.onStartup(servletContext); } /** *  动态注册CAS过滤器 * @Author mazq * @Date 2020/08/27 16:41 * @Param [servletContext] * @return void */ protected void registerCasFilter(ServletContext servletContext) { /* CAS单点登录校验过滤器 */ FilterRegistration casFilter = servletContext.addFilter("casFilter", AuthenticationFilter.class); casFilter.setInitParameter("casServerLoginUrl" , CasPropertiesLoader.getValue(CasParamKeyEnum.CAS_SERVER_HOST_LOGIN_URL.getCasParamKey())); casFilter.setInitParameter("serverName" , CasPropertiesLoader.getValue(CasParamKeyEnum.APP_SERVER_HOST_URL.getCasParamKey())); casFilter.setInitParameter("ignorePattern" , "/static/*"); casFilter.addMappingForUrlPatterns(EnumSet.allOf(DispatcherType.class) , true, "/*"); /* CAS单点登录ticket校验过滤器 */ FilterRegistration casValidationFilter = servletContext.addFilter("casValidationFilter", Cas30ProxyReceivingTicketValidationFilter.class); casValidationFilter.setInitParameter("casServerUrlPrefix" , CasPropertiesLoader.getValue(CasParamKeyEnum.CAS_SERVER_HOST_URL.getCasParamKey())); casValidationFilter.setInitParameter("serverName" , CasPropertiesLoader.getValue(CasParamKeyEnum.APP_SERVER_HOST_URL.getCasParamKey())); casValidationFilter.setInitParameter("redirectAfterValidation" , "true"); casValidationFilter.setInitParameter("useSession" , "true"); casValidationFilter.setInitParameter("encoding" , "UTF-8"); casValidationFilter.addMappingForUrlPatterns(EnumSet.allOf(DispatcherType.class) , true, "/*"); /* CAS单点登出过滤器 */ FilterRegistration singleSignOutFilter = servletContext.addFilter("singleSignOutFilter", SingleSignOutFilter.class); singleSignOutFilter.setInitParameter("casServerUrlPrefix" , CasPropertiesLoader.getValue(CasParamKeyEnum.CAS_SERVER_HOST_URL.getCasParamKey())); singleSignOutFilter.addMappingForUrlPatterns(EnumSet.allOf(DispatcherType.class) , true, "/*"); /* HttpServletRequestWrapper过滤器 */ FilterRegistration httpServletRequestWrapperFilter = servletContext.addFilter("httpServletRequestWrapperFilter", HttpServletRequestWrapperFilter.class); httpServletRequestWrapperFilter.addMappingForUrlPatterns(EnumSet.allOf(DispatcherType.class) , true, "/*"); /* AssertionThreadLocal过滤器 */ FilterRegistration assertionThreadLocalFilter = servletContext.addFilter("assertionThreadLocalFilter", AssertionThreadLocalFilter.class); assertionThreadLocalFilter.addMappingForUrlPatterns(EnumSet.allOf(DispatcherType.class) , true, "/*"); } /** * 注册CAS监听器 * @Author mazq * @Date 2020/08/27 16:43 * @Param [servletContext] * @return void */ protected void registerCasListener(ServletContext servletContext){ //注册监听器 servletContext.addListener(SingleSignOutHttpSessionListener.class); } @Override protected FilterRegistration.Dynamic registerServletFilter(ServletContext servletContext, Filter filter) { return super.registerServletFilter(servletContext, filter); } @Override protected void registerContextLoaderListener(ServletContext servletContext) { super.registerContextLoaderListener(servletContext); }
}
  
 

  
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文章来源: smilenicky.blog.csdn.net，作者：smileNicky，版权归原作者所有，如需转载，请联系作者。

原文链接：smilenicky.blog.csdn.net/article/details/108263579