Primefaces 主题更改为用户特定

当我使用下面的代码时，它工作正常并更改主题，但问题是如果其中一个用户登录并将主题更改为系统中的每个用户.我想要的是只为特定用户而不是每个用户影响主题.

When I use the below code it's working fine and change the theme, but the problem is if one of the user logged and change the theme it effects to the every user in the system. what I want is to effect the theme only for the particular user but not for every one.

Web.xml

<context-param>
    <param-name>primefaces.THEME</param-name>
    <param-value>#{settingsController.userTheme}</param-value>
</context-param>

素面 (.xhtml)

primeface (.xhtml)

<h:outputLabel for="userTheme" value="Theme Name  *:" style="width: 300px"/> 
<p:selectOneMenu id="userTheme" value="#{settingsController.userTheme}"  style="width:200px" 
                     required="true" requiredMessage="Theme Name is Required" > 
       <f:selectItems value="#{settingsController.themeMap}"/> 
 </p:selectOneMenu>
                       

SettingsController.java 类

SettingsController.java class

@ManagedBean(name = "settingsController")
@SessionScoped
@Controller
public class SettingsController {

   private String userTheme = "start" ;  
   private Map<String , String>  themeMap ;

   @PostConstruct
   public void init (){
      setThemeMapInit(  );
   }

   public String getUserTheme() {
       return userTheme;
   }

   public void setUserTheme(String userTheme) {
       this.userTheme = userTheme;
   }

   public Map<String, String> getThemeMap() {
       return themeMap;
   }

   public void setThemeMapInit() {
       themeMap =  new LinkedHashMap<String, String>();
       themeMap.put("Aristo", "aristo");
       themeMap.put("After-noon", "afternoon");
       themeMap.put("After-Work", "afterwork");
       themeMap.put("Black-Tie", "black-tie");
       themeMap.put("Blitzer", "blitzer");
       themeMap.put("Bluesky", "bluesky");
       themeMap.put("Bootstrap", "bootstrap");
       themeMap.put("Casablanca", "casablanca");
       themeMap.put("Cupertino", "cupertino");
       themeMap.put("Dark-Hive", "dark-hive");
       themeMap.put("Delta", "delta");
       themeMap.put("Excite-Bike", "excite-bike");
       themeMap.put("Flick", "flick");
       themeMap.put("Glass-X", "glass-x");
       themeMap.put("Home", "home");
       themeMap.put("Hot-Sneaks", "hot-sneaks");
       themeMap.put("Humanity", "humanity");
       themeMap.put("Overcast", "overcast");
       themeMap.put("Pepper-Grinder", "pepper-grinder");
       themeMap.put("Redmond", "redmond");
       themeMap.put("Rocket", "rocket");
       themeMap.put("Sam", "sam");
       themeMap.put("Smoothness", "smoothness");
       themeMap.put("South-Street", "south-street");
       themeMap.put("Start", "start");
       themeMap.put("Sunny", "sunny");
       themeMap.put("Swanky-Purse", "swanky-purse");
       themeMap.put("UI-Lightness", "ui-lightness");
   }

   public void setThemeMap(Map<String, String> themeMap) {
       this.themeMap =themeMap;
   }


   public void  sumbitUserSettings (){
       ExternalContext ec = FacesContext.getCurrentInstance().getExternalContext();
       try {
           ec.redirect(((HttpServletRequest) ec.getRequest()).getRequestURI());
       } catch (IOException ex) {
           Logger.getLogger(SettingsController.class.getName()).log(Level.SEVERE, null, ex);
       }
   }

}