Hello How to use List of POJO's with JSF h:selectOneMenu or Primefaces p:selectOneMenu?
I know that there are lot of related questions which suggest to use Converter but no clear build from scratch example.
I want a generic converter code for the above Purpose.
Please suggest any alternatives/point me to the right question if its a duplicate.
here is a complete example of using a POJO with Primefaces p:selectOneMenu.the primfaces select one menu display a list of students.If you press details button after select any student, a primfaces dialog will appear with the full name of this student.
com.model package:
Student class
package com.model; import java.io.Serializable; public class Student implements Serializable{ private static final long serialVersionUID = 1L; private int Id; public int getId() { return Id; } public void setId(int id) { Id = id; } private String lastName; private String firstName; public String getLastName() { return lastName; } public void setLastName(String lastName) { this.lastName = lastName; } public String getFirstName() { return firstName; } public void setFirstName(String firstName) { this.firstName = firstName; } public Student() { super(); } public Student(String lastName, String firstName,int Id) { super(); this.lastName = lastName; this.firstName = firstName; this.Id = Id; }} The converter
package com.model; import java.util.ArrayList; import java.util.List; import javax.faces.application.FacesMessage; import javax.faces.component.UIComponent; import javax.faces.context.FacesContext; import javax.faces.convert.Converter; import javax.faces.convert.ConverterException; import javax.faces.convert.FacesConverter; @FacesConverter(forClass = com.model.Student.class,value="student") public class StudentConverter implements Converter{ public static List studentDB; static { studentDB = new ArrayList(); studentDB.add(new Student("William", "Wong", 1)); studentDB.add(new Student("John", "Smith", 2)); studentDB.add(new Student("Mari", "Beckley", 3)); studentDB.add(new Student("Messi", "Leonardo",4)); studentDB.add(new Student("William", "Astrid", 5)); studentDB.add(new Student("William", "Banana", 6)); } public Object getAsObject(FacesContext facesContext, UIComponent component, String submittedValue) { if (submittedValue.trim().equals("")) { return null; } else { try { int number = Integer.parseInt(submittedValue); for (Student s : studentDB) { if (s.getId() == number) { return s; } } } catch(NumberFormatException exception) { throw new ConverterException(new FacesMessage(FacesMessage.SEVERITY_ERROR, "Conversion Error", "Not a valid player")); } } return null; } public String getAsString(FacesContext facesContext, UIComponent component, Object value) { if (value == null || value.equals("")) { return ""; } else { return String.valueOf(((Student) value).getId()); } } } com.managedbean package
package com.managedbean; import java.util.List; import javax.annotation.PostConstruct; import javax.faces.bean.ManagedBean; import javax.faces.bean.ViewScoped; import com.model.Student; import com.model.StudentConverter; @ManagedBean @ViewScoped public class StudentMB { private Student selectedStudent; public Student getSelectedStudent() { return selectedStudent; } public void setSelectedStudent(Student selectedStudent) { this.selectedStudent = selectedStudent; } public List getStudents() { return students; } public void setStudents(List students) { this.students = students; } private List students; @PostConstruct public void init(){ students=StudentConverter.studentDB; } } selectMenu.xhtml
get the source code
you can download the complete example built using eclipse and deployed to glassfish from here
In h:selectOneMenu it's possible, but yours POJO must implements a interface with a identifier atrribute.
Interface:
public inteface IConvertible { public Integer getId(); } Pojo:
public class POJO implements IConvertible { .... .... } And generic converter:
@SuppressWarnings("unchecked") public class GenericConverter implements Converter { @Override public Object getAsObject(FacesContext arg0, UIComponent arg1, String arg2) { Entidade ret = null; UIComponent src = arg1; if (src != null) { List childs = src.getChildren(); UISelectItems itens = null; if (childs != null) { for (UIComponent ui : childs) { if (ui instanceof UISelectItems) { itens = (UISelectItems) ui; break; } else if (ui instanceof UISelectItem) { UISelectItem item = (UISelectItem) ui; try { IConvertible val = (IConvertible) item.getItemValue(); if (arg2.equals("" + val.getId())) { ret = val; break; } } catch (Exception e) { } } } } if (itens != null) { List values = (List) itens.getValue(); if (values != null) { for (Entidade val : values) { if (arg2.equals("" + val.getId())) { ret = val; break; } } } } } return ret; } @Override public String getAsString(FacesContext arg0, UIComponent arg1, Object arg2) { String ret = ""; if (arg2 != null && arg2 instanceof Entidade) { Entidade m = (Entidade) arg2; if (m != null) { Long id = m.getId(); if (id != null) { ret = id.toString(); } } } return ret; } } JSF page: