如何在JSF页面中显示ArrayList

Question

我想创建可编辑的h:panelGrid 。 我创建了这个ArrayList：

public ArrayList<userdata> dataList = new ArrayList<>();

    public class userdata
    {

        int userid;
        int groupid;
        String specialnumber;
        String username;
        String passwd;
        Date datetochangepasswd;
        String address;
        String stateregion;
        String country;
        String userstatus;
        String telephone;
        Date dateuseradded;
        Date userexpiredate;
        Date dateuserlocked;
        String city;
        String email;
        String description;

        public userdata(int userid, int groupid, String specialnumber, String username, String passwd, Date datetochangepasswd,
                String address, String stateregion, String country, String userstatus, String telephone, Date dateuseradded,
                Date userexpiredate, Date dateuserlocked, String city, String email, String description)
        {

            this.userid = userid;
            this.groupid = groupid;
            this.specialnumber = specialnumber;
            this.username = username;
            this.passwd = passwd;
            this.datetochangepasswd = datetochangepasswd;
            this.address = address;
            this.stateregion = stateregion;
            this.country = country;
            this.userstatus = userstatus;
            this.telephone = telephone;
            this.dateuseradded = dateuseradded;
            this.userexpiredate = userexpiredate;
            this.dateuserlocked = dateuserlocked;
            this.city = city;
            this.email = email;
            this.description = description;
        }

        public String getAddress()
        {
            return address;
        }

        public void setAddress(String address)
        {
            this.address = address;
        }

        public String getCity()
        {
            return city;
        }

        public void setCity(String city)
        {
            this.city = city;
        }

        public String getCountry()
        {
            return country;
        }

        public void setCountry(String country)
        {
            this.country = country;
        }

        public Date getDatetochangepasswd()
        {
            return datetochangepasswd;
        }

        public void setDatetochangepasswd(Date datetochangepasswd)
        {
            this.datetochangepasswd = datetochangepasswd;
        }

        public Date getDateuseradded()
        {
            return dateuseradded;
        }

        public void setDateuseradded(Date dateuseradded)
        {
            this.dateuseradded = dateuseradded;
        }

        public Date getDateuserlocked()
        {
            return dateuserlocked;
        }

        public void setDateuserlocked(Date dateuserlocked)
        {
            this.dateuserlocked = dateuserlocked;
        }

        public String getDescription()
        {
            return description;
        }

        public void setDescription(String description)
        {
            this.description = description;
        }

        public String getEmail()
        {
            return email;
        }

        public void setEmail(String email)
        {
            this.email = email;
        }

        public int getGroupid()
        {
            return groupid;
        }

        public void setGroupid(int groupid)
        {
            this.groupid = groupid;
        }

        public String getPasswd()
        {
            return passwd;
        }

        public void setPasswd(String passwd)
        {
            this.passwd = passwd;
        }

        public String getSpecialnumber()
        {
            return specialnumber;
        }

        public void setSpecialnumber(String specialnumber)
        {
            this.specialnumber = specialnumber;
        }

        public String getStateregion()
        {
            return stateregion;
        }

        public void setStateregion(String stateregion)
        {
            this.stateregion = stateregion;
        }

        public String getTelephone()
        {
            return telephone;
        }

        public void setTelephone(String telephone)
        {
            this.telephone = telephone;
        }

        public Date getUserexpiredate()
        {
            return userexpiredate;
        }

        public void setUserexpiredate(Date userexpiredate)
        {
            this.userexpiredate = userexpiredate;
        }

        public int getUserid()
        {
            return userid;
        }

        public void setUserid(int userid)
        {
            this.userid = userid;
        }

        public String getUsername()
        {
            return username;
        }

        public void setUsername(String username)
        {
            this.username = username;
        }

        public String getUserstatus()
        {
            return userstatus;
        }

        public void setUserstatus(String userstatus)
        {
            this.userstatus = userstatus;
        }
    }


    // Getter for the data list
    public ArrayList<userdata> getuserdata(){

        return dataList;
    }

我想将数据显示到h:panelGrid 。 你能告诉我我该怎么做吗？

我想使用h:panelGrid创建此可编辑表。 我想可以使用h:panelGrid代替h:dataTable吗？

最好的祝愿

Answer 1

尽管实际上可能可以使用h:panelGrid来破解某些东西，但您可能不得不在MB中摆弄许多不必要的代码，仅用于创建和绑定组件。

如果您想为HTML表提供更细粒度的控件，则可能需要使用ui:repeat ，如下所示：

<table>
    <ui:repeat var="elem" value="#{yourMB.yourDataList}">
        <tr>
            <td>#{elem.userid}</td>
            <td>
               <h:outputText value="#{elem.name}" 
                    rendered="#{not elem.editable}" />
               <h:inputText value="#{elem.name}" rendered="#{elem.editable}" />
            </td>
            <td>
               <h:outputText value="#{elem.telephone}" 
                    rendered="#{not elem.editable}" />
               <h:inputText value="#{elem.telephone}"
                            rendered="#{elem.editable}" />
            </td>
            <td>
              <h:commandLink value="Edit" rendered="#{not elem.editable}"
                 action="#{yourMB.editAction(elem)}" />
            </td>
        </tr>
    </ui:repeat>
</table>
<h:commandButton value="Save Changes" action="#{yourMB.saveAction}" />

为此，您应该有一个如下所示的支持bean：

@ManagedBean
@ViewScoped
public class YourMB {
    private List<Elem> dataList;

    @PostConstruct
    public void init() {
        // initialize dataList here
    }
    public void editAction(Elem e) {
        e.setEditable(true);
    }
    public void saveAction() {
        // do your thing here to update in the database,
        // and then reset the editable property for all items:
        for (Elem e : dataList) {
            e.setEditable(false);
        }
    }
    // getters and setters...
}

查阅此处可用的教程 ， 该教程教导了如何使用ui:repeat ，还提供了JSF中循环的其他选项。