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<String> baseNameLocal= new ThreadLocal<>();
private ClassLoader bundleClassLoader = Thread.currentThread().getContextClassLoader();
private String defaultParentView;
private Locale[] localesToInitialize;
private final Map<Locale, BeanFactory> localeCache = new HashMap();
private final Map<List<ResourceBundle>, 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<ResourceBundle> 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。
<bean
p:order="0">
<property name="basename" value="${cas.viewResolver.basename}" />
<property name="cache" value="false"></property>
</bean>
配置过滤器
<filter>
<filter-name>ViewSelectFilter</filter-name>
<filter-class>com.redxun.cas.ViewSelectFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>ViewSelectFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
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：
<bean ></bean>
