java - 如何使用 ejb3 和注释在数据源中注入(inject)依赖项

Question

@Override
protected ActionForward unspecified(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response) throws Exception {

    DataSource dataSource = (DataSource) new InitialContext().lookup("java:jboss/STRUTS-DS");

    dataSource.getConnection();

    SessionBean sessionBean = new SessionBean();
    sessionBean.testConnection();
    return mapping.findForward("list");
}

在Action中，使用lookup，问题发生在SessionBean

@Stateless
    public class SessionBean {

        @PersistenceContext(???)
        EntityManager entityManager;

        @Resource(???)
        DataSource dataSource;

        public void testConnection() {
                PreparedStatement preparedStatement = null;
                Connection connection = null;

                try {
                        connection = dataSource.getConnection();
                        preparedStatement = connection.prepareStatement("drop table test");
                        preparedStatement.execute();

                        preparedStatement = connection.prepareStatement("CREATE TABLE example (id INT,data VARCHAR(100));");
                        preparedStatement.execute();

                        System.out.println("Done");

                } catch (SQLException sqlE) {
                        throw new EJBException(sqlE);
                } finally {
                        try {
                                if (preparedStatement != null) {
                                        preparedStatement.close();
                                }
                        } catch (Exception e) {}
                        try {
                                if (connection != null) {
                                        connection.close();
                                }
                        } catch (Exception e) {}
                }

        }

    }

我正在尝试注入(inject)这个。在我从未注入(inject)的数据源中，我在 Resource 中放了什么？

Answer 1

尝试在无状态 bean 中注入(inject) DataSource 并使用它的 JNDI 名称

@Resource(lookup = "java:jboss/STRUTS-DS")
private DataSource dataSource;

您还需要使用 @EJB 或 @Inject 注释或 JNDI 查找将此无状态注入(inject)客户端，这些是您如何确定的唯一方法该容器将正确地将所有依赖项(在您的情况下为 DataSource )注入(inject)到 bean 中。