Name.java：主键。

Student.java：实体Bean类。

StudentDAO.java：会话Bean的业务接口

StudentDAOBean.java：会话Bean的实现类

Client.java：测试EJB的客户端类。

jndi.properties：jndi属性文件，提供访问jdni的基本配置属性。

Build.xml：ant 配置文件，用以编译、发布、测试、清除EJB。

下面针对每个文件的内容做一个介绍。

Name.java

package com.kuaff.ejb3.composite;

import java.io.Serializable;

import javax.ejb.AccessType;

import javax.ejb.DependentObject;

@DependentObject(access = AccessType.PROPERTY)

public class Name implements java.io.Serializable

{

private String first;

private String last;

public Name()

{

}

public Name(String first, String last)

{

this.first = first;

this.last = last;

}

public String getFirst()

{

return first;

}

public void setFirst(String first)

{

this.first = first;

}

public String getLast()

{

return last;

}

public void setLast(String last)

{

this.last = last;

}

public int hashCode()

{

return (first+last).hashCode();

}

public boolean equals(Object object)

{

if (this == object) return true;

if (object == null) return false;

if (! (object instanceof Name)) return false;

Name name = (Name)object;

if ((name.first.equals(first)) && (name.last.equals(last)))

return true;

else

return false;

}

}

Student.java

package com.kuaff.ejb3.composite;

import javax.ejb.Dependent;

import javax.ejb.DependentAttribute;

import javax.ejb.Column;

import javax.ejb.Entity;

import javax.ejb.GeneratorType;

import javax.ejb.Id;

import javax.ejb.Table;

@Entity @Table(name = "STUDENT") public class Student implements java.io.Serializable

{

private Name name;

private String grade;

private String email;

public void setName(Name name)

{

this.name = name;

}

@Id(generate = GeneratorType.NONE)

@Dependent(

{ @DependentAttribute(name = "first", column ={ @Column(name = "FIRST") }),

@DependentAttribute(name = "last", column ={ @Column(name = "LAST") }) })

public Name getName()

{

return name;

}

public void setGrade(String grade)

{

this.grade = grade;

}

@Column(name = "GRADE")

public String getGrade()

{

return grade;

}

public void setEmail(String email)

{

this.email = email;

}

@Column(name = "EMAIL")

public String getEmail()

{

return email;

}

}

StudentDAO.java

package com.kuaff.ejb3.composite;

import javax.ejb.Remote;

import java.util.List;

@Remote

public interface StudentDAO

{

void create(String first, String last, String grade, String email);

Student find(Name name);

List findByFirstName(String name);

List findByLastName(String name);

List findByEmail(String email);

void merge(Student s);

}

StudentDAOBean.java

package com.kuaff.ejb3.composite;

import java.util.List;

import javax.ejb.EntityManager;

import javax.ejb.Inject;

import javax.ejb.Stateless;

@Stateless

public class StudentDAOBean implements StudentDAO

{

@Inject

private EntityManager manager;

public void create(String first, String last, String grade, String email)

{

Student student = new Student();

student.setName(new Name(first,last));

student.setGrade(grade);

student.setEmail(email);

manager.create(student);

}

public Student find(Name name)

{

return manager.find(Student.class, name);

}

public List findByFirstName(String name)

{

return manager.createQuery("from Student s where s.name.last = :name").
setParameter("name", name).listResults();

}

public List findByLastName(String name)

{

return manager.createQuery("from Student s where s.name.first = :name").
setParameter("name", name).listResults();

}

public List findByEmail(String email)

{

return manager.createQuery("from Student s where s.email = :email").
setParameter("email", email).listResults();

}

public void merge(Student s)

{

manager.merge(s);

}

}

Client.java

package com.kuaff.ejb3.composite;

import javax.naming.InitialContext;

import javax.naming.NamingException;

import java.util.List;

public class Client

{

public static void main(String[] args) throws NamingException

{

InitialContext ctx = new InitialContext();

StudentDAO dao = (StudentDAO) ctx.lookup(StudentDAO.class.getName());

dao.create("晁","岳攀","8","smallnest@kuaff.com");

dao.create("朱","立焕","6","zhuzhu@kuaff.com");

Name name = new Name("朱","立焕");

//List list = dao.findByEmail("zhuzhu@kuaff.com");

Student s = dao.find(name);

System.out.printf("%s %s的email:%s%n",s.getName().getFirst(),s.getName().getLast(),s.getEmail());

/*

for(Object o:list)

{

Student s = (Student)o;

System.out.printf("%s %s的email:%s%n",s.getName().getFirst(),s.getName().getLast(),s.getEmail());

}

*/

}

}