springfacesutil.java

在JSF的faces-config.xml中及Spring的配置文件中查找bean

package cn.yuma.houseinfo.util;

import javax.faces.FactoryFinder;
import javax.faces.application.Application;
import javax.faces.application.ApplicationFactory;
import javax.faces.context.FacesContext;
import javax.faces.el.ValueBinding;
import javax.servlet.ServletContext;

import org.springframework.context.ApplicationContext;
import org.springframework.web.context.support.WebApplicationContextUtils;

/**
 * Spring与JSF BEAN查找工具
 * 
 * @author liyong
 *
 */
public final class SpringFacesUtil {
	public SpringFacesUtil() {
	  }
	  /**
	   * 从Spring中查找bean.
	   * @param beanname String
	   * @return Object
	   */
	  public static Object findBean(String beanname) {
	    ServletContext context = (ServletContext) FacesContext.getCurrentInstance().
	        getExternalContext().getContext();
	    ApplicationContext appctx = WebApplicationContextUtils.
	        getRequiredWebApplicationContext(context);
	    return appctx.getBean(beanname);
	  }
	  /**
	   * 从JSF中查找bean.
	   * @param beanname String
	   * @return Object
	   */
	  public static Object lookupBean(String beanname) {
	    Object obj = getValueBinding(getJsfEl(beanname)).getValue(FacesContext.
	        getCurrentInstance());
	    return obj;
	  }
	 
	  private static ValueBinding getValueBinding(String el) {
	    return getApplication().createValueBinding(el);
	  }
	 
	  private static Application getApplication() {
	    ApplicationFactory appFactory = (ApplicationFactory) FactoryFinder.
	        getFactory(FactoryFinder.APPLICATION_FACTORY);
	    //FactoryFinder.FACES_CONTEXT_FACTORY
	    //FactoryFinder.RENDER_KIT_FACTORY
	    return appFactory.getApplication();
	  }
	 
	  private static String getJsfEl(String value) {
	    return "#{" + value + "}";
	  }
}