java - JSF 将对象添加到 arrayList

Question

我一直在尝试使用 Java Server Faces 将 Student 对象添加到 arrayList，但我可以弄清楚如何做到这一点，这是我到目前为止所得到的。我需要使用什么方法，我把它放在哪里？

索引

<h:body>
    <h:form >
        <h:panelGrid columns="2" >
            <h:outputText value="Name"/>
            <p:inputText value="#{student.name}" required="true">
            <h:outputText value="Age"/>
            <p:inputText value="#{student.age}" required="true">
                <p:commandButton value="Add" action="#{student.showGo()}"><!--go to another JSF page-->
                   <!-- ActionListener needed-->
                </p:commandButton>  
        </h:panelGrid>  
    </h:form>
</h:body>

学生 bean

@Named(value = "student")
@RequestScoped
public class StudentBean {


private String name;
private int age;

public StudentBean(String name, int age) {
    this.name = name;
    this.age = age;
}


public StudentBean() {
}

public String showGo(){
    return "show";
}

public int getAge() {
    return age;
}

public void setAge(int age) {
    this.age = age;
}

public String getName() {
    return name;
}

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

}

列表bean

@Named(value = "list")
@RequestScoped
public class List {

private ArrayList<StudentBean> studentList = new ArrayList<>();
public List() {
}

 public void addStudent()
{
    StudentBean student = new StudentBean();
    studentList.add(student);
}

Answer 1

我不确定我是否理解你的意思。但是，如果您的目的只是将 name 和 age 保存在对象中并将其添加到列表中，则以下内容应该可以达到目的:

1. SessionScope 中的托管 bean，以便您可以在下一页中访问它(`show.xhtml??):

   @Named(value = "student")
   @SessionScoped
   public class StudentBean {
   
    private ArrayList<Student> studentList = new ArrayList<>();
   
        private String name;
        private int age;
   
        public StudentBean(String name, int age) {
           this.name = name;
           this.age = age;
        }
   
   
         public StudentBean() {
         }
   
         public String showGo(){
            Stundent student = new Student(name, age);
            studentList.add(student);
   
            return "show";
        }
   
       public int getAge() {
           return age;
       }
   
       public void setAge(int age) {
           this.age = age;
       }
   
       public String getName() {
           return name;
       }
   
       public void setName(String name) {
           this.name = name;
       }
   
       public List<Student> getStundentList() {
           return studentList;
       }
   }
   

2. 仅定义一个简单的 Sundent 类作为 JavaBean:

   public class Stundent {
       private String name;
       private int age;
   
       public Stundent() { }
   
       public Stundent(String name, int age) {
            this.name = name;
            this.age = age;
       }
   
       // getters and setters
   }
   

   如果您还有疑问，请给我留言。