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，与查找一起使用，SessionBean

中出现问题

@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) {}
                }

        }

    }

我正在尝试注入此内容。在我的数据源中从未注入过，我在Resource中放了什么？

抱歉：Lorem ipsum dolor sit amet，consectetuer adipiscing elit，sed diam nonummy nibh euismod tincidunt ut laoreet dolore magna aliquam erat volutpat。

Answer 1

尝试在无状态bean中注入DataSource，并使用它的JNDI名称，如

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

您还需要使用@EJB或@Inject注释或使用JNDI查找将此无状态注入客户端，这些是您如何确保容器正确注入所有依赖项的唯一方法（在您的情况下为DataSource）到bean中。

如何使用ejb3和注释在数据源中注入依赖项

1 个答案: