JSF参数传递方式之一：f:param标签

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

<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

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

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

(2)通过RequestParameterMap取值

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

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>

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

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

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

<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")%>