datatable doesnot呈现数据通过链接列表从数据库中的jsf

Question

这是我的jsf页面，其中我已经尝试了很好的满足对java bean对象的属性的要求。我已经检查了这个网站的所有问题，但似乎有所帮助。我不知道是什么问题，我的代码

<h:dataTable value="#{contact.getPeopleList()}" var="data"> 

     <h:column> 
      <f:facet name="header">ID</f:facet> 
      <h:outputText value="#{data.id}"/> 
     </h:column> 
     <h:column> 
      <f:facet name="header">Name</f:facet> 
      <h:outputText value="#{persons.name}"/> 
     </h:column> 
     <h:column> 
      <f:facet name="header">Mobile Number</f:facet> 
      #{persons.mobilenumber} 
     </h:column> 
     <h:column> 
      <f:facet name="header">Phone Number</f:facet> 
      #{persons.telephone} 
     </h:column> 
     <h:column> 
      <f:facet name="header">Address</f:facet> 
      #{persons.address} 
     </h:column> 

    </h:dataTable> 
</h:body> 

这一个是我的联系类在我所注入Person类

 @Named 
     @RequestScoped 
     public class Contact { 
      private Person person; 

      @PostConstruct 
      public void init(){ 
       this.person=new Person(); 

      } 

      public Person getPerson() { 
       return person; 
      } 

      public void setPerson(Person person) { 
       this.person = person; 
      } 



      public String onSubmit(){ 
       ContactDAO doaContact=new ContactDAO(); 
       doaContact.insertContact(person); 


       return "contactpage"; 
      } 
      public List<Person> getPeopleList(){ 
       ContactDAO doaContact=new ContactDAO(); 
       List<Person> personList =doaContact.getAll(); 
       return personList; 
      } 
     } 


      package np.com.drose.beans; 

      import java.util.List; 
      import np.com.drose.doa.ContactDAO; 



      public class Person { 
       private int id; 
       private String name; 
       private int mobilenumber; 
       private int telephone; 
       private String address; 


       public Person() { 

       } 

       public Person(int id, String name, int mobilenumber, int telephone, String address) { 
        this.id = id; 
        this.name = name; 
        this.mobilenumber = mobilenumber; 
        this.telephone = telephone; 
        this.address = address; 
       } 


       public Person(String name, int mobilenumber, int telephone, String address) { 
        this.name = name; 
        this.mobilenumber = mobilenumber; 
        this.telephone = telephone; 
        this.address = address; 

       } 

       public int getId() { 
        return id; 
       } 

       public void setId(int id) { 
        this.id = id; 
       } 

       public String getName() { 
        return name; 
       } 

       public void setName(String name) { 
        this.name = name; 
       } 

       public int getMobilenumber() { 
        return mobilenumber; 
       } 

       public void setMobilenumber(int mobilenumber) { 
        this.mobilenumber = mobilenumber; 
       } 

       public int getTelephone() { 
        return telephone; 
       } 

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

       public String getAddress() { 
        return address; 
       } 

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

在这里我得到得到Person类的属性数据访问对象类困惑，我似乎无法找到我做错了什么，为什么我的代码不是从数据库呈现数据

public List<Person> getAll(){ 
        List<Person> contactList= new LinkedList<>(); 
        String sql="Select * from contact"; 
        try{ 
         conn = DataConnection.getConnetion(); 
         ps=conn.prepareStatement(sql); 
         rs=ps.executeQuery(); 
         while(rs.next()){ 
          Person person=new Person(rs.getInt("id"),rs.getString("name"),rs.getInt("mobilenumber"),rs.getInt("telephone"),rs.getString("address")); 
          contactList.add(person); 
         } 

        }catch(Exception EX){ 
         EX.printStackTrace(); 
        } 
        return contactList; 
       } 

Answer 1

呈现在JSF的数据表，你需要有豆class.For例如listas属性：

  @Named 
     @RequestScoped 
     public class Contact { 
      private Person person; 
      private List<Person>personList; 


      @PostConstruct 
      public void init(){ 
       this.person=new Person(); 

      } 

      public Person getPerson() { 
       return person; 
      } 

      public void setPerson(Person person) { 
       this.person = person; 
      } 

      public List<Person> getPersonList() { 
     return personList; 
    } 



    public void setPersonList(List<Person> personList) { 
     this.personList = personList; 
    } 

      public String onSubmit(){ 
       ContactDAO doaContact=new ContactDAO(); 
       doaContact.insertContact(person); 


       return "contactpage"; 
      } 
      public List<Person> getPeopleList(){ 
       ContactDAO doaContact=new ContactDAO(); 
       personList =doaContact.getAll(); 
       return personList; 
      } 
} 

，并在HTML文件中 你应该这样写：

<h:dataTable value="#{contact.personList}" var="data"> 

请像那。