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：