部署Java在服务器端的EJB组件的方法

create database student; //创建数据库 student

create table student( //创建表student 和 数据库同名
`id` integer(11) not null, 
`name` varchar2(20) default null,
primary key (`id`)
)ENGINE=InnoDB DEFAULT CHARSET=latin1

insert into student values(1,'easynoder');
commit;

grant all privileges on *.* to root@localhost indentified by "1234"

@Entity //表明这是一个实体Bean
@Table (name = "student" ) //和数据库表student 建立映射
public class StudentEntity implements Serializable {
  private static final long serialVersionUID = 4002145187978562529L;

  @Id // 表明是该实体的id
  @GeneratedValue(strategy = GenerationType. AUTO ) //id生成策略
  @Column(name = "id" )//对应student表id字段
  private int id ; 

  @Column(name = "name" ) // 对应student表name字段
  private String name;

  public int getId() {
    return id ;
  }

  public String getName() {
    return name ;
  }

  public void setId(int id) {
    this .id = id;
  }

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

}

 public interface BaseOperation {
 
   public List<?> findAll();
 }

@Stateless //这是一个无状态Bean
@Remote (BaseOperation. class) //指明Bean的remote接口
public class StudentDaoBean implements BaseOperation {
   
   // EntityManager是由EJB容器自动配置和管理的，unitName属性的值对应
persistence.xml 中< persistence-unit name = "MyEJBProject" transaction-type = "JTA" ></ persistence-unit > name的配置
  @PersistenceContext(unitName = "MyEJBProject" )
  private EntityManager em;

  @SuppressWarnings( "unchecked" )
  public List<?> findAll() {
    System. out .println("查询开始..." );
    List<StudentEntity> list = em.createQuery( " from StudentEntity ").getResultList();
    if (list != null) {
      Iterator<StudentEntity> it = list.iterator();
      while (it.hasNext()) {
        StudentEntity student = it.next();
        System. out .println("学生id:" + student.getId());
        System. out .println("学生名称：" + student.getName());
      }
    }
    System. out .println("查询完毕...." );
    return list;
  }

}

<?xml version="1.0" encoding="UTF-8"?>
<module xmlns="urn:jboss:module:1.1" name="com.mysqldatabase.mysql">
   <resources>
     <resource-root path="mysql-connector-java-5.**-bin.jar"/>
   </resources>
   <dependencies>
     <module name="javax.api"/>
     <module name="javax.transaction.api"/>
     <module name="javax.servlet.api" optional="true"/>
   </dependencies>
</module>

<datasources>
        <datasource jndi-name="java:jboss/KouMySQLDS" pool-name="MySQLDS" enabled="true" use-java-context="true">
          <connection-url>jdbc:mysql://localhost:3306/student</connection-url>
          <driver>mysql</driver>
          <security>
            <user-name>root</user-name>
            <password>1234</password>
          </security>
        </datasource>
        <drivers>
          <driver name="mysql" module="com.mysqldatabase.mysql">
            <driver-class>com.mysql.jdbc.Driver</driver-class>
            <xa-datasource-class>com.mysql.jdbc.jdbc2.optional.MysqlXADataSource</xa-datasource-class>
          </driver>
        </drivers>
      </datasources>

< jta-data-source> java:jboss/KouMySQLDS </jta-data-source >
      < properties>
        < property name= "hibernate.hbm2ddl.auto" value ="validate" />
        < property name= "hibernate.jdbc.fetch_size" value ="15" />
        < property name= "hibernate.jdbc.batch_size" value ="10" />
        < property name= "hibernate.show_sql" value ="true" />
        < property name= "hibernate.format_sql" value ="true" ></ property>
      </ properties>

endpoint.name= client-endpoint
remote.connectionprovider.create.options.org.xnio.Options.SSL_ENABLED= false
remote.connections= default
remote.connection.default.host= localhost
remote.connection.default.port= 4447
remote.connection.default.connect.options.org.xnio.Options.SASL_POLICY_NOANONYMOUS= false
remote.connection.default.username= yourUsername
remote.connection.default.password= yourPassword

public static void main(String[] args) {

    Properties props = new Properties();
    props.setProperty(Context. URL_PKG_PREFIXES,"org.jboss.ejb.client.naming" );
    try {
      Context context = new InitialContext(props);
      // 这里需要注意字符串的写法：ejbservice 表示ejb的包名，StudentDaoBean表示咱们实际调用的会话Bean，org.easynoder.ejb2.dao.BaseOperation表示 对应的接口
      BaseOperation op = (BaseOperation) context
          .lookup("ejb:/ejbservice//StudentDaoBean!org.easynoder.ejb2.dao.BaseOperation" );
      op.findAll();
    } catch (NamingException e) {
      e.printStackTrace();
    }
  }