implementato esercizio studenti con collegamento da client via interfaccia remota

exercise1/EJB.java

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+package exercise1;
+
+import javax.ejb.Local;
+import javax.ejb.LocalBean;
+import javax.ejb.Stateless;
+import javax.inject.Inject;
+import javax.persistence.EntityManager;
+import javax.persistence.PersistenceContext;
+import javax.persistence.Query;
+import javax.validation.constraints.NotNull;
+import java.util.List;
+
+/**
+ * Created by Giovanni on 24/05/2015.
+ */
+@Stateless
+@LocalBean
+public class EJB implements RemoteInterface {
+
+    @PersistenceContext(unitName = "exercise1")
+    EntityManager em ;
+
+
+    public void create_student (@NotNull Student s) {
+        em.persist(s);
+    }
+    public void update_student (@NotNull Student s) {
+        em.merge(s);
+        em.persist(s);
+    }
+    public void delete_student (@NotNull Student s) {
+        em.merge(s);
+        em.remove(s);
+    }
+
+    public @NotNull List<Student> findname (@NotNull String name) {
+        Query Q = em.createNamedQuery("findname");
+        Q.setParameter(1, name);
+        return (List<Student>)Q.getResultList();
+    }
+
+    public @NotNull List<Student> findsurname (@NotNull String name) {
+        Query Q = em.createNamedQuery("findsurname");
+        Q.setParameter(1,name);
+        return (List<Student>)Q.getResultList();
+    }
+
+    public @NotNull List<Student> findyear (@NotNull String name) {
+        Query Q = em.createNamedQuery("findyear");
+        Q.setParameter(1,name);
+        return (List<Student>)Q.getResultList();
+    }
+
+
+}

exercise1/InitializeDB.java

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+package exercise1;
+
+import javax.annotation.PostConstruct;
+import javax.annotation.PreDestroy;
+import javax.ejb.*;
+import javax.inject.Inject;
+
+/**
+ * Created by Giovanni on 24/05/2015.
+ */
+
+@Singleton
+@Startup
+public class InitializeDB {
+
+    private Student s1,s2;
+
+    @Inject
+    private EJB e;
+
+    @PostConstruct
+    void pupulate (){
+            s1 = new Student("mario","marra","1");
+            s2 = new Student("mario","maria","2");
+            e.create_student(s1);
+            e.create_student(s2);
+    }
+
+    @PreDestroy
+    void delete () {
+        e.delete_student(s1);
+        e.delete_student(s2);
+    }
+
+
+
+
+
+
+}

exercise1/RemoteInterface.java

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+package exercise1;
+
+import javax.ejb.Remote;
+import javax.persistence.Query;
+import javax.validation.constraints.NotNull;
+import java.util.List;
+
+/**
+ * Created by Giovanni on 24/05/2015.
+ */
+@Remote
+public interface RemoteInterface {
+
+    @NotNull List<Student> findname (@NotNull String name);
+    @NotNull List<Student> findsurname (@NotNull String name) ;
+    @NotNull List<Student> findyear (@NotNull String name) ;
+
+}

exercise1/Student.java

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+package exercise1;
+
+import javax.ejb.Local;
+import javax.persistence.*;
+import javax.validation.constraints.NotNull;
+import java.io.Serializable;
+
+/**
+ * Created by Giovanni on 24/05/2015.
+ */
+@Entity
+@NamedQueries({
+        @NamedQuery(name = "findname", query = "SELECT s FROM Student s WHERE s.name =?1"),
+        @NamedQuery(name = "findsurname", query = "SELECT s FROM Student s WHERE s.surname =?1"),
+        @NamedQuery(name = "findyear", query = "SELECT s FROM Student s WHERE s.years =?1")
+})
+public class Student implements Serializable {
+
+    @Id
+    @GeneratedValue
+    private Long id;
+
+    @NotNull
+    private String name;
+    @NotNull
+    private String surname;
+    @NotNull
+    private String years;
+
+
+    public Student(){}
+
+    public Student (@NotNull String in_name, @NotNull String in_surname, @NotNull String in_year){
+
+        name = in_name;
+        surname = in_surname;
+        years = in_year;
+
+    }
+
+    public @NotNull String getName() {
+        return name;
+    }
+
+    public @NotNull String getSurname() {
+        return surname;
+    }
+
+    public @NotNull String getYears() {
+        return years;
+    }
+}