JSF将对象添加到arrayList

Question

I have been trying to add an Student object to an arrayList using Java Server Faces, but I can figure it out how to do it, here is hat i got so far. what method I need to use, and where do i put it?

Index

<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>

Student 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;
}

}

List 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

I am not sure that I understood you. But if your intention is just to save name and age in an object and add it to a list, the following should serve the purpose:

1. The managed bean in SessionScope so that you can access it in the next page (`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. Define just a simple Sundent class as 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 } 

   If you still have a question leave me a comment.

Answer 2

You could try to do something like this:

<p:commandButton value="Add" action="#{list.addStudent()}"></p:commandButton>  

and in addStudent :

public String addStudent()
{
    StudentBean student = new StudentBean();
    studentList.add(student);
    return "show";
}