Question

我有控制器类LoginData.java

@Controller
@ManagedBean(name = "login")
@SessionScoped
public class LoginData implements Serializable{

@Autowired
private LoginDAO loginDao;

private String username;
private String password;

public String getUsername() {
    return username;
}

public void setUsername(String username) {
    this.username = username;
}

public String getPassword() {
    return password;
}

public void setPassword(String password) {
    this.password = password;
}

public void validateUser(){
    try{
        loginDao.login(username, password);
    }catch(BusinessException e){
    }
}

}

我正在尝试自动启动这个Dao及其实现：

LoginDAO

public interface LoginDAO {

    public boolean login(String username, String password)throws BusinessException;

    public boolean register(String username, String password, UserType type)throws BusinessException;

}

LoginDAOImpl

public class LoginDAOImpl implements LoginDAO{

private String username;
private String password;

private SessionFactory sessionFactory;

public void setSessionFactory(SessionFactory sessionFactory) {
    this.sessionFactory = sessionFactory;
}

@Override
public boolean login(String username, String password) throws BusinessException{
    Query query = sessionFactory.getCurrentSession().createQuery(
            "SELECT u FROM User u WHERE u.username=:un");
    query.setParameter("un", username);
    if(query.list().size()==0)throw new BusinessException("No user in database!");
    User user = (User)(query.list().get(0));
    return getHashMD5(password).equals(user.getPassword());
}

@Override
public boolean register(String username, String password, UserType type) throws BusinessException{
    throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
}

public static String getHashMD5(String string) throws BusinessException{
    try {
        MessageDigest md = MessageDigest.getInstance("MD5");
        BigInteger bi = new BigInteger(1, md.digest(string.getBytes()));
        return bi.toString(16);
    } catch (Exception ex) {
        throw new BusinessException(ex.getMessage());
    }
}

}

我也在尝试在DAO实现中注入sessionFactory，我不知道这段代码是否可行。我的配置xml：

调度-servlet.xml中

<bean class="org.springframework.web.servlet.mvc.support.ControllerClassNameHandlerMapping"/>

<bean id="urlMapping" class="org.springframework.web.servlet.handler.SimpleUrlHandlerMapping">
    <property name="mappings">
        <props>
            <prop key="index.htm">indexController</prop>
        </props>
    </property>
</bean>

<bean id="viewResolver"
      class="org.springframework.web.servlet.view.InternalResourceViewResolver"
      p:prefix="/WEB-INF/jsp/"
      p:suffix=".jsp" />

<!--
The index controller.
-->
<bean name="indexController"
      class="org.springframework.web.servlet.mvc.ParameterizableViewController"
      p:viewName="index" />

<bean id="loginDAO" class="rs.ac.bg.etf.services.LoginDAOImpl"/>

的web.xml

<context-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>/WEB-INF/applicationContext.xml</param-value>
</context-param>
<context-param>
    <param-name>javax.faces.PROJECT_STAGE</param-name>
    <param-value>Development</param-value>
</context-param>
<listener>
    <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
<servlet>
    <servlet-name>dispatcher</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    <load-on-startup>2</load-on-startup>
</servlet>
<servlet>
    <servlet-name>Faces Servlet</servlet-name>
    <servlet-class>javax.faces.webapp.FacesServlet</servlet-class>
    <load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
    <servlet-name>dispatcher</servlet-name>
    <url-pattern>*.htm</url-pattern>
</servlet-mapping>
<servlet-mapping>
    <servlet-name>Faces Servlet</servlet-name>
    <url-pattern>/faces/*</url-pattern>
</servlet-mapping>
<session-config>
    <session-timeout>
        30
    </session-timeout>
</session-config>
<welcome-file-list>
    <welcome-file>faces/index.xhtml</welcome-file>
</welcome-file-list>

当从JSF表单在控制器中调用dao方法时，我得到空指针异常。谁知道可能是什么问题？ PS：xml文件主要由Netbeans IDE生成。

Answer 1

您缺少自动装配的@Repository注释。

试试这个：

@Repository("LoginDAO")
public class LoginDAOImpl implements LoginDAO

Netbeans中的Spring + Hibernate DAO注入失败

1 个答案: