概要
在实际需求中，客户想通过不同的域名显示不同的登录界面，比如输入 manage.aps.cn 显示运维管理登录，business.aps.cn 显示业务管理登录。
实现方法
1.准备两套登录UI
在cas目录 WEB-INF/view/jsp目录下整两份UI。
增加两个属性文件，这些属性文件和UI有关系。
查看一下 business.properties
cas 默认显示界面是在cas.properties 文件中配置，配置完成后，不能再变更了，因此需要能够实现切换UI。
2.代码实现
我的思路是通过根据域名动态改变 这个basename。在过滤器中获取域名，并动态改变basename。
实现方式在过滤器中，判断当前的访问域名，判定需要访问哪个UI并进行切换。
修改源码：
org.springframework.web.servlet.view.ResourceBundleViewResolver，
这个代码原本是不能实现UI切换的。
package org.springframework.web.servlet.view;import java.util.HashMap;import java.util.LinkedList;import java.util.List;import java.util.Locale;import java.util.Map;import java.util.MissingResourceException;import java.util.ResourceBundle;import org.springframework.beans.BeansException;import org.springframework.beans.factory.BeanFactory;import org.springframework.beans.factory.DisposableBean;import org.springframework.beans.factory.InitializingBean;import org.springframework.beans.factory.NoSuchBeanDefinitionException;import org.springframework.beans.factory.support.PropertiesBeanDefinitionReader;import org.springframework.context.ConfigurableApplicationContext;import org.springframework.core.Ordered;import org.springframework.web.context.support.GenericWebApplicationContext;import org.springframework.web.servlet.View;public class ResourceBundleViewResolver extends AbstractCachingViewResolver implements Ordered, InitializingBean, DisposableBean{ public static final String DEFAULT_BASENAME = "views"; private int order = 2147483647; private ThreadLocal baseNameLocal= new ThreadLocal<>(); private ClassLoader bundleClassLoader = Thread.currentThread().getContextClassLoader(); private String defaultParentView; private Locale[] localesToInitialize; private final Map localeCache = new HashMap(); private final Map , ConfigurableApplicationContext> bundleCache = new HashMap(); public void setOrder(int order) { this.order = order; } public int getOrder() { return this.order; } public void setBasename(String basename) { this.baseNameLocal.set(basename); } public void setBundleClassLoader(ClassLoader classLoader) { this.bundleClassLoader = classLoader; } protected ClassLoader getBundleClassLoader() { return this.bundleClassLoader; } public void setDefaultParentView(String defaultParentView) { this.defaultParentView = defaultParentView; } public void setLocalesToInitialize(Locale[] localesToInitialize) { this.localesToInitialize = localesToInitialize; } public void afterPropertiesSet() throws BeansException { if (this.localesToInitialize != null) for (Locale locale : this.localesToInitialize) initFactory(locale); } protected View loadView(String viewName, Locale locale) throws Exception { BeanFactory factory = initFactory(locale); try { return (View)factory.getBean(viewName, View.class); } catch (NoSuchBeanDefinitionException ex) { } return null; } protected synchronized BeanFactory initFactory(Locale locale) throws BeansException { List bundles = new LinkedList(); String baseName="manage"; if(this.baseNameLocal.get()!=null){ baseName=this.baseNameLocal.get(); } ResourceBundle bundle = getBundle(baseName, locale); bundles.add(bundle); GenericWebApplicationContext factory = new GenericWebApplicationContext(); factory.setParent(getApplicationContext()); factory.setServletContext(getServletContext()); PropertiesBeanDefinitionReader reader = new PropertiesBeanDefinitionReader(factory); reader.setDefaultParentBean(this.defaultParentView); reader.registerBeanDefinitions(bundle); factory.refresh(); return factory; } protected ResourceBundle getBundle(String basename, Locale locale) throws MissingResourceException { return ResourceBundle.getBundle(basename, locale, getBundleClassLoader()); } public void destroy() throws BeansException { for (ConfigurableApplicationContext factory : this.bundleCache.values()) { factory.close(); } this.localeCache.clear(); this.bundleCache.clear(); }}
增加一个过滤器，根据域名修改 页面视图目录。
package com.redxun.cas;import java.io.IOException;import javax.servlet.Filter;import javax.servlet.FilterChain;import javax.servlet.FilterConfig;import javax.servlet.ServletException;import javax.servlet.ServletRequest;import javax.servlet.ServletResponse;import javax.servlet.http.HttpServletRequest;import org.springframework.web.servlet.view.ResourceBundleViewResolver;public class ViewSelectFilter implements Filter{ @Override public void destroy() { } @Override public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain) throws IOException, ServletException { HttpServletRequest request=(HttpServletRequest)req; ResourceBundleViewResolver resolver=(ResourceBundleViewResolver) SpringContextHolder.getBean("viewResolver"); String serverName=request.getServerName(); String pre=serverName.substring(0,serverName.indexOf(".")); resolver.setBasename(pre); chain.doFilter(req, res); } @Override public void init(FilterConfig arg0) throws ServletException { }} 修改 cas-servlet.xml配置。
配置过滤器
ViewSelectFilter com.redxun.cas.ViewSelectFilter ViewSelectFilter /*
测试效果
在host添加域名映射
192.168.1.77 manage.aps.cn
192.168.1.77 business.aps.cn测试效果如下：
访问：manage.aps.cn
business.aps.cn
另外一个知识点，我们在过滤器中需要获取，spring mvc的上下文。
我们需要实现一个获取上下文的类。实现接口：ApplicationContextAware
package com.redxun.cas;import org.springframework.beans.BeansException;import org.springframework.context.ApplicationContext;import org.springframework.context.ApplicationContextAware;public class SpringContextHolder implements ApplicationContextAware { private static ApplicationContext _ctx; @Override public void setApplicationContext(ApplicationContext ctx) throws BeansException { _ctx=ctx; } public static Object getBean(String beanId){ return _ctx.getBean(beanId); } public static Object getBean(Class cls){ return _ctx.getBean(cls); }} 这里配置也是有要求的需要配置 cas-servlet.xml配置文件中。
配置如下：