JSF参数传递形式说明

JSF参数传递方式说明
先说明一种：
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<h:commandLink value="整理材料 " action="#{documentPressBackingBean.cleanDatum}" target="HideFrame"> <f:param name="documentArchiveId" value="#{pre.documentArchiveId}"></f:param></h:commandLink><h:outputLabel styleid="show"></h:outputLabel><h:commandButton value="整理材料" action="#{documentPressBackingBean.cleanDatum}" onclick="this.form.target='HideFrame';" style="display:none"><x:updateActionListener property="#{documentPressBackingBean.documentArchiveId}" value="#{pre.documentArchiveId}" /></h:commandButton>

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以下是其他方式：

JSF参数传递方式之一：f:param标签

页面到Bean的参数传递
页面中设置参数：

<h:form>                <h:commandLink value="Test2" action="#{paramBean.test}">                    <f:param name="name" value="zhang"></f:param>                    <f:param name="id" value="123456"></f:param>                </h:commandLink>    </h:form>   

注意:这里只能使用h:commandLink标签，而不能使用h:commandButton标签!
后台取参数：
(1) 通过Request对象取值

HttpServletRequest request = (HttpServletRequest)FacesContext.getCurrentInstance().getExternalContext().getRequest();            request.getParameter("name");   

(2)通过RequestParameterMap取值

Map varMap = FacesContext.getCurrentInstance().getExternalContext().getRequestParameterMap();            varMap.get("id");   

(3)通过配置文件进行Bean的属性值注入，在Bean的方法中直接使用属性

<managed-bean>      <managed-bean-name>paramBean</managed-bean-name>      <managed-bean-class>com.spg.bean.ParamBean</managed-bean-class>      <managed-bean-scope>request</managed-bean-scope>      <managed-property>       <property-name>id</property-name>       <property-class>java.lang.String</property-class>       <value>#{param.id} </value>      </managed-property>    </managed-bean>   

页面到页面的参数传递
页面中设置参数：
(1)

<h:outputLink value="param2.jsf">                    <h:outputText value="Test4"></h:outputText>                    <f:param name="name" value="chen"></f:param>                    <f:param name="id" value="123456"></f:param>        </h:outputLink>   

(2)

<h:outputLink value="param2.jsf?name=chen&id=123456">                    <h:outputText value="Test4"></h:outputText>        </h:outputLink>   

注意：以上两种方法，不能同时使用!
页面中取参数：
(1) 使用JSF的值表达式

<h:outputText value="#{param.name}"></h:outputText>         <h:outputText value="#{param.id}"></h:outputText>   

(2) 使用JSP的表达式

<%=request.getParameter("name")%>        <%=request.getParameter("id")%>  

JSF参数传递方式之二：Backing Bean 与 h:inputHidden标签

Backing Beanimport javax.faces.component.UIInput;    import javax.faces.component.UIOutput;       public class BackingBean    {           private UIOutput idComponent;         public UIOutput getIdComponent()        {            return idComponent;        }           public void setIdComponent(UIOutput idComponent)        {            this.idComponent = idComponent;        }     } 

页面到Bean的参数传递
页面中设置参数：

<h:form>                <h:inputHidden value="123456" binding="#{backingBean.idComponent}"></h:inputHidden>                <h:commandButton value="登录" action="#{paramBean.login}"></h:commandButton>    </h:form>   

后台取参数：

FacesContext context = FacesContext.getCurrentInstance();            BackingBean backBean =(BackingBean)context.getApplication().getVariableResolver().resolveVariable(context,"backingBean");//该方法已经过时            BackingBean bean =(BackingBean)context.getApplication().getELResolver().getValue(context.getELContext(), null, "backingBean");            backBean.getIdComponent().getValue();            bean.getIdComponent().getValue();   FacesContext context = FacesContext.getCurrentInstance();

2.2页面到页面的参数传递
页面中设置参数：

<h:form>            <h:inputHidden value="123456"            binding="#{backingBean.idComponent}"></h:inputHidden>            <h:commandButton value="Test5"   action="param"></h:commandButton>            <h:commandLink value="Test6" action="param"></h:commandLink>        </h:form> 

注意：h:outputLink 标签不能使用该方式传递参数！
页面中取参数：

<h:outputText value="#{backingBean.idComponent.value}"></h:outputText>  

JSF参数传递方式之三：通过session(application)对象传递

页面到Bean的参数传递
页面中设置参数：

<h:form>                <%session.setAttribute("name","hujilie"); %>                <%application.setAttribute("id","123456"); %>                <h:commandButton value="Test8" action="#{paramBean.test2}"></h:commandButton>                <h:commandLink  value="Test8" action="#{paramBean.test2}"></h:commandLink>        </h:form> 

 
后台取参数：

FacesContext context = FacesContext.getCurrentInstance();            Map sessionMap =context.getExternalContext().getSessionMap();            Map applicationMap = context.getExternalContext().getApplicationMap();    HttpSession session =(HttpSession) context.getExternalContext().getSession(true);    ServletContext application = (ServletContext)context.getExternalContext().getContext();            sessionMap.get("name");            applicationMap.get("id");            session.getAttribute("name");            application.getAttribute("id"); 

页面到页面的参数传递
页面中设置参数：

<h:form>                <%session.setAttribute("name","hujilie"); %>                <%application.setAttribute("id","123456"); %>                <h:outputLink value="param2.jsf">Test10</h:outputLink>        </h:form> 

页面中取参数：

<h:outputText value="#{sessionScope.name}"></h:outputText><br>        <h:outputText value="#{applicationScope.id}"></h:outputText>   

JSF参数传递方式之四：f:attribute标签传递

页面到Bean的参数传递
页面中设置参数：

<h:form>                <h:commandButton action="#{paramBean.test3}" value="Test11" actionListener="#{paramBean.changeName}">                    <f:attribute name="name" value="hujilie"/>                </h:commandButton>                <h:commandLink action="#{paramBean.test3}" value="Test12" actionListener="#{paramBean.changeName}">                    <f:attribute name="name" value="hujilie"/>                </h:commandLink>        </h:form> 

后台取参数：

public void changeName(ActionEvent e)        {            UIComponent component = e.getComponent();            Map<String, Object> map = component.getAttributes();            setName((String)map.get("name"));        }  

JSF参数传递方式之五：f:setPropertyActionListener 标签传递

页面到Bean的参数传递
页面中设置参数：

<h:form>                <h:commandButton action="#{paramBean.test3}" value="Test14">                   <f:setPropertyActionListener value="hujilie" target="#{paramBean.name}"/>                </h:commandButton>                <h:commandLink action="#{paramBean.test3}" value="Test15">                    <f:setPropertyActionListener value="hujilie" target="#{paramBean.name}"/>                </h:commandLink>        </h:form>   

后台取参数：直接使用属性的值。
本文来自CSDN博客http://blog.csdn.net/linwei_1029/archive/2010/03/17/5384745.aspx

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