PhaseListener
（请先看看源代码）
一开始，我不停地往同一个页面发送请求，发现那些监听器越来越多，我还以为虽然是RequestScope的，但是JSF中的bean还是不自己注销才而又不停的产生，才搞到监听器越来越多。后来才发现，每次关掉浏览器的时候，bean已经注销的了，只是监听器还在那里，结果每次产生bean的时候又注册监听器，搞到监听器越来越多。
后来经过多番“调查研究”，才知道，phaseListener是针对整个应用的lifeCycle的（ lifeCycle是不是整个应用只有一个的啊？？），所以，即使注册那个监听器的bean被销毁了，那个监听器还在那儿，所以每次重新构造一个那个bean的时候，又重新构造了监听器。。所以就搞得重复向页面发送请求的时候，阶段监听器（PhaseListener）会越来越多！
下面是页面代码，通过按state1按钮来：
一开始，我不停地往同一个页面发送请求，发现那些监听器越来越多，我还以为虽然是RequestScope的，但是JSF中的bean还是不自己注销才而又不停的产生，才搞到监听器越来越多。后来才发现，每次关掉浏览器的时候，bean已经注销的了，只是监听器还在那里，结果每次产生bean的时候又注册监听器，搞到监听器越来越多。
后来经过多番“调查研究”，才知道，phaseListener是针对整个应用的lifeCycle的（ lifeCycle是不是整个应用只有一个的啊？？），所以，即使注册那个监听器的bean被销毁了，那个监听器还在那儿，所以每次重新构造一个那个bean的时候，又重新构造了监听器。。所以就搞得重复向页面发送请求的时候，阶段监听器（PhaseListener）会越来越多！
下面是页面代码，通过按state1按钮来：
< %@page contentType ="text/html"% >
< %@page pageEncoding ="UTF-8"% >
< %@taglib prefix ="f" uri ="http://java.sun.com/jsf/core"% >
< %@taglib prefix ="h" uri ="http://java.sun.com/jsf/html"% >
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<%--
This file is an entry point for JavaServer Faces application.
--%>
< f:view >
< f:loadBundle basename ="lr.LR" var ="lr" />
< html >
< head >
< meta http-equiv ="Content-Type" content ="text/html; charset=UTF-8" >
< title >JSP Page </title>
</head>
< body >
< h:message for ="mboxs" />
< h:form id ="form1" >
< h:selectManyCheckbox id ="mboxs" required ="true" binding ="#{welcomeJSFbean.mboxs}" border ="1" layout ="pageDirection" >
< f:selectItem itemValue ="dogs" itemLabel ="#{lr.dogs}" />
< f:selectItem itemValue ="cats" itemLabel ="#{lr.cats}" />
< f:selectItem itemValue ="snakes" itemLabel ="#{lr.snakes}" />
< f:selectItem itemValue ="rabbits" itemLabel ="#{lr.rabbits}" />
< f:selectItem itemValue ="lions" itemLabel ="#{lr.lions}" />
< f:selectItem itemValue ="tigers" itemLabel ="#{lr.tigers}" />
</h:selectManyCheckbox>
< h:commandButton value ="next" action ="#{welcomeJSFbean.showSelection}" />
< h:commandButton value ="state1" actionListener ="#{stateBean.doState1}" />
</h:form>
</body>
</html>
</f:view>
下面是注册PhaseListener的那个bean的源代码
< %@page pageEncoding ="UTF-8"% >
< %@taglib prefix ="f" uri ="http://java.sun.com/jsf/core"% >
< %@taglib prefix ="h" uri ="http://java.sun.com/jsf/html"% >
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<%--
This file is an entry point for JavaServer Faces application.
--%>
< f:view >
< f:loadBundle basename ="lr.LR" var ="lr" />
< html >
< head >
< meta http-equiv ="Content-Type" content ="text/html; charset=UTF-8" >
< title >JSP Page </title>
</head>
< body >
< h:message for ="mboxs" />
< h:form id ="form1" >
< h:selectManyCheckbox id ="mboxs" required ="true" binding ="#{welcomeJSFbean.mboxs}" border ="1" layout ="pageDirection" >
< f:selectItem itemValue ="dogs" itemLabel ="#{lr.dogs}" />
< f:selectItem itemValue ="cats" itemLabel ="#{lr.cats}" />
< f:selectItem itemValue ="snakes" itemLabel ="#{lr.snakes}" />
< f:selectItem itemValue ="rabbits" itemLabel ="#{lr.rabbits}" />
< f:selectItem itemValue ="lions" itemLabel ="#{lr.lions}" />
< f:selectItem itemValue ="tigers" itemLabel ="#{lr.tigers}" />
</h:selectManyCheckbox>
< h:commandButton value ="next" action ="#{welcomeJSFbean.showSelection}" />
< h:commandButton value ="state1" actionListener ="#{stateBean.doState1}" />
</h:form>
</body>
</html>
</f:view>
下面是注册PhaseListener的那个bean的源代码
/*
* To change this template, choose Tools | Templates
* and open the template in the editor.
*/
package beans;
import javax.faces.FactoryFinder;
import javax.faces.event.ActionEvent;
import javax.faces.event.PhaseEvent;
import javax.faces.event.PhaseId;
import javax.faces.event.PhaseListener;
import javax.faces.lifecycle.Lifecycle;
import javax.faces.lifecycle.LifecycleFactory;
/**
*
* @author bache
*/
public class StateTestingBean {
public StateTestingBean() {
System.out.println( "执行构造方法StateTestingBean()");
Lifecycle lifecycle = ((LifecycleFactory) FactoryFinder.getFactory(FactoryFinder.LIFECYCLE_FACTORY)).getLifecycle(LifecycleFactory.DEFAULT_LIFECYCLE);
lifecycle.addPhaseListener( new PhaseListener() {
public void beforePhase(PhaseEvent event) {
System.out.println( "RESTORE_VIEW: beforePhase");
}
public void afterPhase(PhaseEvent event) {
System.out.println( "RESTORE_VIEW: afterPhase");
}
public PhaseId getPhaseId() {
return PhaseId.RESTORE_VIEW;
}
});
lifecycle.addPhaseListener( new PhaseListener() {
public void beforePhase(PhaseEvent event) {
System.out.println( "APPLY_REQUEST_VALUES: beforePhase");
}
public void afterPhase(PhaseEvent event) {
System.out.println( "APPLY_REQUEST_VALUES: afterPhase");
}
public PhaseId getPhaseId() {
return PhaseId.APPLY_REQUEST_VALUES;
}
});
lifecycle.addPhaseListener( new PhaseListener() {
public void beforePhase(PhaseEvent event) {
System.out.println( "PROCESS_VALIDATIONS: beforePhase");
}
public void afterPhase(PhaseEvent event) {
System.out.println( "PROCESS_VALIDATIONS: afterPhase");
}
public PhaseId getPhaseId() {
return PhaseId.PROCESS_VALIDATIONS;
}
});
lifecycle.addPhaseListener( new PhaseListener() {
public void beforePhase(PhaseEvent event) {
System.out.println( "UPDATE_MODEL_VALUES: beforePhase");
}
public void afterPhase(PhaseEvent event) {
System.out.println( "UPDATE_MODEL_VALUES: afterPhase");
}
public PhaseId getPhaseId() {
return PhaseId.UPDATE_MODEL_VALUES;
}
});
lifecycle.addPhaseListener( new PhaseListener() {
public void beforePhase(PhaseEvent event) {
System.out.println( "INVOKE_APPLICATION: beforePhase");
}
public void afterPhase(PhaseEvent event) {
System.out.println( "INVOKE_APPLICATION: afterPhase");
}
public PhaseId getPhaseId() {
return PhaseId.INVOKE_APPLICATION;
}
});
lifecycle.addPhaseListener( new PhaseListener() {
public void beforePhase(PhaseEvent event) {
System.out.println( "RENDER_RESPONSE: beforePhase");
}
public void afterPhase(PhaseEvent event) {
System.out.println( "RENDER_RESPONSE: afterPhase");
}
public PhaseId getPhaseId() {
return PhaseId.RENDER_RESPONSE;
}
});
}
public void doState1(ActionEvent e) {
}
}
* To change this template, choose Tools | Templates
* and open the template in the editor.
*/
package beans;
import javax.faces.FactoryFinder;
import javax.faces.event.ActionEvent;
import javax.faces.event.PhaseEvent;
import javax.faces.event.PhaseId;
import javax.faces.event.PhaseListener;
import javax.faces.lifecycle.Lifecycle;
import javax.faces.lifecycle.LifecycleFactory;
/**
*
* @author bache
*/
public class StateTestingBean {
public StateTestingBean() {
System.out.println( "执行构造方法StateTestingBean()");
Lifecycle lifecycle = ((LifecycleFactory) FactoryFinder.getFactory(FactoryFinder.LIFECYCLE_FACTORY)).getLifecycle(LifecycleFactory.DEFAULT_LIFECYCLE);
lifecycle.addPhaseListener( new PhaseListener() {
public void beforePhase(PhaseEvent event) {
System.out.println( "RESTORE_VIEW: beforePhase");
}
public void afterPhase(PhaseEvent event) {
System.out.println( "RESTORE_VIEW: afterPhase");
}
public PhaseId getPhaseId() {
return PhaseId.RESTORE_VIEW;
}
});
lifecycle.addPhaseListener( new PhaseListener() {
public void beforePhase(PhaseEvent event) {
System.out.println( "APPLY_REQUEST_VALUES: beforePhase");
}
public void afterPhase(PhaseEvent event) {
System.out.println( "APPLY_REQUEST_VALUES: afterPhase");
}
public PhaseId getPhaseId() {
return PhaseId.APPLY_REQUEST_VALUES;
}
});
lifecycle.addPhaseListener( new PhaseListener() {
public void beforePhase(PhaseEvent event) {
System.out.println( "PROCESS_VALIDATIONS: beforePhase");
}
public void afterPhase(PhaseEvent event) {
System.out.println( "PROCESS_VALIDATIONS: afterPhase");
}
public PhaseId getPhaseId() {
return PhaseId.PROCESS_VALIDATIONS;
}
});
lifecycle.addPhaseListener( new PhaseListener() {
public void beforePhase(PhaseEvent event) {
System.out.println( "UPDATE_MODEL_VALUES: beforePhase");
}
public void afterPhase(PhaseEvent event) {
System.out.println( "UPDATE_MODEL_VALUES: afterPhase");
}
public PhaseId getPhaseId() {
return PhaseId.UPDATE_MODEL_VALUES;
}
});
lifecycle.addPhaseListener( new PhaseListener() {
public void beforePhase(PhaseEvent event) {
System.out.println( "INVOKE_APPLICATION: beforePhase");
}
public void afterPhase(PhaseEvent event) {
System.out.println( "INVOKE_APPLICATION: afterPhase");
}
public PhaseId getPhaseId() {
return PhaseId.INVOKE_APPLICATION;
}
});
lifecycle.addPhaseListener( new PhaseListener() {
public void beforePhase(PhaseEvent event) {
System.out.println( "RENDER_RESPONSE: beforePhase");
}
public void afterPhase(PhaseEvent event) {
System.out.println( "RENDER_RESPONSE: afterPhase");
}
public PhaseId getPhaseId() {
return PhaseId.RENDER_RESPONSE;
}
});
}
public void doState1(ActionEvent e) {
}
}
本文出自 “辽源大火的奋斗历程” 博客，转载请与作者联系！