Question

我需要一个可访问服务和数据访问层的会话bean，但我不想在每个对象中注入它。

我不想要这个：

 <!-- a HTTP Session-scoped bean exposed as a proxy -->
    <bean id="userPreferences" class="com.foo.UserPreferences" scope="session">

          <!-- this next element effects the proxying of the surrounding bean -->
          <aop:scoped-proxy/>
    </bean>

    <!-- a singleton-scoped bean injected with a proxy to the above bean -->
    <bean id="userService" class="com.foo.SimpleUserService">

        <!-- a reference to the proxied 'userPreferences' bean -->
        <property name="userPreferences" ref="userPreferences"/>

    </bean>

是否可以创建一个静态类来检索当前请求的会话bean？

这样的事情：

 <!-- a HTTP Session-scoped bean exposed as a proxy -->
        <bean id="userPreferences" class="com.foo.UserPreferences" scope="session">

              <!-- this next element effects the proxying of the surrounding bean -->
              <aop:scoped-proxy/>
        </bean>

Public Class sessionResolver{

  public static UserPreferences getUserPreferences(){

  //Not real code!!!
  return (UserPreferences)WebApplicationContex.getBean("userPreferences")
  }

}

Answer 1

我不确定这是否有效，我现在没有办法尝试，但是这个怎么样：

public static UserPreferences getUserPreferences(){

    return (UserPreferences) ContextLoader.getCurrentWebapplicationContext()
                                            .getBean("userPreferences");
}

Answer 2

定义一个辅助类，如UserPrefHelper.java

public class UserPrefHelper {
  private static com.foo.UserPreferences userPrefs;
  private void setUserPrefs(com.foo.UserPreferences userPrefs) {
     this.userPrefs = userPrefs;
  }
  private static UserPreferences getUserPrefs() {
     return userPrefs;
  }
}



 <!-- a HTTP Session-scoped bean exposed as a proxy -->
<bean id="userPreferences" class="com.foo.UserPreferences" scope="session">

      <!-- this next element effects the proxying of the surrounding bean -->
      <aop:scoped-proxy/>
</bean>

<!-- a singleton-scoped bean injected with a proxy to the above bean -->
<bean id="userPrefHelper" class="com.foo.UserPrefHelper">

    <!-- a reference to the proxied 'userPreferences' bean -->
    <property name="userPreferences" ref="userPreferences"/>

</bean>

然后直接在您的类中使用该助手类，这就是全部。它每次都会转换为一个代理的UserPreferences对象，方法执行将委托给会话范围的bean。

public void test() {
     UserPreferences userPrefs = UserPrefHelper.getUserPrefs();
    //That's all. Don't worry about static access and thread safety. Spring is clever enough.                      
}

Spring和JSF中检索会话bean的静态类

2 个答案: