JSF缓存

JSF缓存【转】

在用JSF 做系统view层时，有两个必须要解决的问题，就是缓存的控制和页面权限的判断，尤其是缓存问题，经常搞的我改了东西看不到效果，然后再找问题在哪，最后没招的时候，清空缓存，一切就ok，真tnnd。所以实现了JSF的PhaseListener接口，所有页面都设为no-cache，牺牲点速度，换取调整的时间，也算值了，反正客户都是在局域网中。

package com.ame.util;

import java.util.Map;

import javax.faces.application.NavigationHandler;
import javax.faces.context.FacesContext;
import javax.faces.event.PhaseEvent;
import javax.faces.event.PhaseId;
import javax.faces.event.PhaseListener;
import javax.servlet.http.HttpServletResponse;

import com.ame.login.bean.LoginBean;
/**
* @author LinRuijun
* @function JSF login capability judgment and cache-control
*/
@SuppressWarnings("serial")
public class LoginCheck implements PhaseListener {

public PhaseId getPhaseId() {
return PhaseId.RESTORE_VIEW;
}

public void beforePhase(PhaseEvent phaseEvent) {
FacesContext facesContext = phaseEvent.getFacesContext();
HttpServletResponse response = (HttpServletResponse)facesContext.getExternalContext().getResponse();
response.addHeader("Pragma", "no-cache");
response.addHeader("Cache-Control", "no-cache");
response.addHeader("Cache-Control", "no-store");
response.addHeader("Cache-Control", "must-revalidate");
}

public void afterPhase(PhaseEvent event) {
FacesContext fc = event.getFacesContext();
try{
String pageName = fc.getViewRoot().getViewId();
boolean loginPage = false;
if(pageName.lastIndexOf("login")>-1){
loginPage = true;
}
if (!loginPage && !loggedIn()) {
NavigationHandler nh = fc.getApplication().getNavigationHandler();
nh.handleNavigation(fc, null, "logout");
}

}catch(Exception e){
e.printStackTrace(System.out);
}

}
private boolean loggedIn() {
Map<String, Object> session = FacesContext.getCurrentInstance().getExternalContext().getSessionMap();
if (session.get("loginBean") != null) {
LoginBean login = (LoginBean)(session.get("loginBean"));
return login.isLoginFlag();
}else{
return false;
}
}
}

然后在JSF的Faces-config.xml 里配置一下

<faces-config xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-facesconfig_1_2.xsd"
version="1.2">
<lifecycle>
<phase-listener id="showPhaseListener">
com.ame.util.LoginCheck
</phase-listener>
</lifecycle>

<navigation-rule>
<from-view-id>*</from-view-id>
<navigation-case>
<from-outcome>logout</from-outcome>
<to-view-id>/login.jsp</to-view-id>
<redirect/>
</navigation-case>
</navigation-rule>
</faces-config>

okay ，一切搞定。