JSF 新手求助

Question

我后台的一个方法需要传进去一个参数，请帮忙写下
 <%
                 UserLoginData ulData = (UserLoginData) request.getSession().getAttribute("UserLoginData");
                 String userLevel = ulData.getLUserLevel().toString;//我需要把userLevel传到customerBean的setBar3D方法去     %>
                 
   <div  style="position:absolute;top:12;left:400;">
 <h:commandButton action="#{customerBean.setBar3D}" value="柱状图" styleClass="btn">public class CustomerBean {
     public void setBar3D() throws Exception {
     }
}<managed-bean>
<managed-bean-name>customerBean</managed-bean-name>
<managed-bean-class>com.supermap.is.CustomerBean</managed-bean-class>
<managed-bean-scope>session</managed-bean-scope>
</managed-bean>
帮帮忙这怎么写啊

Answer 1

<h:commandLink action="#{customerBean.setBar3D}" value="柱状图" styleClass="btn">
   <f:param name="userLevel" value="zhang"></f:param> 
 </h:commandLink> 
 <h:commandLink action="#{customerBean.setThemeGraph}" value="饼状图"  styleClass="btn">
  <f:param name="userLevel" value="zhang"></f:param> 
 </h:commandLink> public void setThemeGraph() throws Exception {
HttpServletRequest request = (HttpServletRequest)FacesContext.getCurrentInstance().getExternalContext().getRequest();
userLevel = request.getParameter("userLevel");//这样拿userLevel是null
//userLevel = FacesContext.getCurrentInstance().getExternalContext().getRequestParameterMap().get( "username ").toString();//这样拿报错}请指点我下

Answer 2

<h:inputHidden value="#{customerBean.userLevel}"/>同时在托管bean中写下对应的setter方法就行了

Answer 3

faces-config.xml
<?xml version="1.0" encoding="UTF-8"?>
<faces-config>
  <managed-bean>
    <managed-bean-name>userBean</managed-bean-name>
    <managed-bean-class>com.supermap.is.demo.jsf.UserBean</managed-bean-class>
    <managed-bean-scope>session</managed-bean-scope>
  </managed-bean>
  <managed-bean>
<managed-bean-name>customerBean</managed-bean-name>
<managed-bean-class>com.supermap.is.CustomerBean</managed-bean-class>
<managed-bean-scope>session</managed-bean-scope>
</managed-bean>
  
 
 <component>
<component-type>UISMap</component-type>
<component-class>com.supermap.is.GetMapFields</component-class>
  </component>
</faces-config>map.jsp
<%
                 UserLoginData ulData = (UserLoginData) request.getSession().getAttribute("UserLoginData");
                 String show = "none";
                 session.setAttribute("userLevel",ulData.getLUserLevel().toString());
                 if("0".equals(ulData.getLUserLevel().toString()))
                  show = "block";
     %>
                 
   <div  style="position:absolute;top:12;left:400;">
    <h:inputHidden value="#{customerBean.userLevel}"></h:inputHidden>
 <h:commandLink action="#{customerBean.setBar3D}" value="柱状图" styleClass="btn">
 </h:commandLink> 
 <h:commandLink action="#{customerBean.setThemeGraph}" value="饼状图"  styleClass="btn">
 </h:commandLink> 
 <h:commandButton action="#{customerBean.returnParent}" value="返回上级"  styleClass="btn"/> 
public class CustomerBean{
private String userLevel;


public String getUserLevel() {
return userLevel;
}
public void setUserLevel(String userLevel) {
System.out.println("userLevel--->"+userLevel);
this.userLevel = userLevel;
}
        public void setThemeGraph() throws Exception {...}
        public void setBar3D() throws Exception {...}
}
帮忙看看这是哪的问题，谢谢了。。

Answer 4

都jsf了，别用这个了：<%
  UserLoginData ulData = (UserLoginData) request.getSession().getAttribute("UserLoginData");
  String show = "none";
  session.setAttribute("userLevel",ulData.getLUserLevel().toString());
  if("0".equals(ulData.getLUserLevel().toString()))
  show = "block";
  %>

Answer 5

用不这个，用什么办法拿到session

Answer 6

你这个userLevel是你传的参数，是根据session的serLoginData得到的？如果是，在backbean里，取session，然后根据这个再得到UserLevel就行了，干嘛这么麻烦，..........

Answer 7

backbean里得到session的方法：Map sessionMap = FacesContext.getCurrentInstance().getExternalContext().getSessionMap();
empno = sessionMap.get("userEmpno").toString();

Answer 8

如果前台页面需要用session的值，在backbean里定义一个变量，把session的值赋给变量，然后，在前台用变量来做，这样页面是页面，逻辑是逻辑，