来自Java-EE bean文件的列表数据没有显示在JSF XHTML DataTable元素中

下面是显示当前有多少应用程序在工作的步骤:

1。用户使用表单注册为投票人。

2。当用户提交表单时，数据被保存到bean中:

import java.io.Serializable;
import javax.enterprise.context.SessionScoped;
import javax.inject.Named;
@Named
@SessionScoped
public class VoterBean implements Serializable{
    private String firstName;
    private String lastName;
    private String address;
 private String city;
 private String state;
 private String zip;
    private String phone;
    private String affil;
    public VoterBean(){
    }
    public String getFirstName(){
        return firstName;
    }
    public String getLastName(){
        return lastName;
    }
    public String getAddress(){
        return address;
    }
 public String getCity(){
        return city;
    }
 public String getState(){
        return state;
    }
 public String getZip(){
        return zip;
    }

    public String getPhone(){
        return phone;
    }
    public String getAffil(){
        return affil;
    }
    public void setFirstName(String firstName){
        this.firstName = firstName;
    }
    public void setLastName(String lastName){
        this.lastName = lastName;
    }
    public void setAddress(String address){
        this.address = address;
    }

  public void setCity(String city){
        this.city = city;
    }
  public void setState(String state){
        this.state = state;
    }
  public void setZip(String zip){
        this.zip = zip;
    }   
    public void setPhone(String phone){
        this.phone = phone;
    }
    public void setAffil(String affil){
        this.affil = affil;
    }

}

3。此外，在提交表单时，上述bean中的信息保存到List变量中的另一个bean中:

import java.io.Serializable;
import javax.enterprise.context.SessionScoped;
import javax.inject.Named;
import java.util.*;
@Named
@SessionScoped
public class VoterData implements Serializable{
 private VoterBean voter = new VoterBean();
     private List<VoterBean> voterList = new ArrayList<VoterBean>();
     public VoterData(){
     }
     public List<VoterBean> getVoterList() {
          return voterList;
     }
     public String saveRegistration(){
         voterList.add(voter);
         return "VoterList";  
     }

}

上面的类的方法是通过表单页面上的Submit按钮调用的:

<h:commandButton id = "Yes" value = "Yes" action = "#{voterData.saveRegistration}"/><br/>

4。在第一个bean中的信息保存到第二个bean中的List Variable之后，用户将被带到一个JSF XHTML页面，该页面显示了在DataTable中注册的所有当前用户:

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE html  
     PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xml:lang="en" lang="en"
  xmlns="http://www.w3.org/1999/xhtml" 
  xmlns:f="http://java.sun.com/jsf/core"
  xmlns:h="http://java.sun.com/jsf/html"
  xmlns:ui="http://java.sun.com/jsf/facelets">
    <h:head>
        <title>Voter Summary</title>
    </h:head>
    <h:body>

      <h:form id = "form" >
      <h:outputLabel value = "First Name:"/> 
     <h:outputLabel value = "#{voterBean.firstName}"    /> 
<br/>
 <h:outputLabel value = "Last Name:"/> 
       <h:outputLabel value = "#{voterBean.lastName}"/>
<br/>

 <h:outputLabel value = "Address:"/> 
      <h:outputLabel value = "#{voterBean.address}"/>
<br/>
 <h:outputLabel value = "City:"/> 
     <h:outputLabel value = "#{voterBean.city}"/>
<br/>

 <h:outputLabel value = "State"/> 
      <h:outputLabel value = "#{voterBean.state}"/>
<br/>

 <h:outputLabel value = "Zip:"/> 
      <h:outputLabel value = "#{voterBean.zip}"/>
<br/>

 <h:outputLabel value = "Phone:"/> 
      <h:outputLabel value = "#{voterBean.phone}"/>
<br/>
 <h:outputLabel value = "Affiliation:"/> 
      <h:outputLabel value = "#{voterBean.affil}"/>
<br/>
Is the following information correct?
<br/>
       <h:commandButton id = "Yes" value = "Yes" action = "#{voterData.saveRegistration}"/><br/>
      <h:commandButton id = "No" value = "No" action = "Register"/><br/>
      </h:form>
    </h:body>
</html>

然而问题来了:

即使在我注册了一个选民之后，列表中的数据也没有显示在HTML页面上。它只显示列名而不显示数据。

我不知道我做错了什么…我添加的信息正确吗?我读错信息了吗?

我想你应该这样做:

<h:outputLabel value = "Address:"/> 
      <h:outputLabel value = "#{voterData.voter.address}"/>
<br/>
 <h:outputLabel value = "City:"/> 
     <h:outputLabel value = "#{voterData.voter.city}"/>
<br/>

 <h:outputLabel value = "State"/> 
      <h:outputLabel value = "#{voterData.voter.state}"/>
<br/>

 <h:outputLabel value = "Zip:"/> 
      <h:outputLabel value = "#{voterData.voter.zip}"/>
<br/>

 <h:outputLabel value = "Phone:"/> 
      <h:outputLabel value = "#{voterData.voter.phone}"/>
<br/>
 <h:outputLabel value = "Affiliation:"/> 
      <h:outputLabel value = "#{voterData.voter.affil}"/>

您正在尝试对原始对象进行更改。您想要访问您的voterData属性voter，它是voterBean的类型。

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