个回答

• Kirshry

  2015-10-02 13:01:18

  已采纳

  变还是不变得看对应的那个对象的Scope。估计你是对scope有点疑惑，spring中每个scope类都实现了org.springframework.beans.factory.config.Scope接口，然后注册到org.springframework.beans.factory.config.CustomScopeConfigurer中。每次获取bean的时候底层都是访问Scope来获取的，你也可以定义自己的Scope。比如
  

  public class ThreadScope implements org.springframework.beans.factory.config.Scope {
      private final ThreadLocal<Map<String, Object>> SCOPE_THREAD = new ThreadLocal() {
          @Override
          protected Object initialValue() {
              return new HashMap<String, Object>();
          }
      };
  
      @Override
      public Object get(String name, ObjectFactory<?> objectFactory) {
          if (SCOPE_THREAD.get().containsKey(name)) {
              return SCOPE_THREAD.get().get(name);
          }
          SCOPE_THREAD.get().put(name, objectFactory.getObject());
          return SCOPE_THREAD.get().get(name);
      }
  
      @Override
      public Object remove(String name) {
          return SCOPE_THREAD.get().remove(name);
      }
  
      //空实现代表不让spring容器管理bean
      @Override
      public void registerDestructionCallback(String s, Runnable runnable) {
  
      }
  
      @Override
      public Object resolveContextualObject(String s) {
          return null;
      }
  
      @Override
      public String getConversationId() {
          return null;
      }
  }

  然后注册：

  <bean class="org.springframework.beans.factory.config.CustomScopeConfigurer">
      <property name="scopes">
          <map>
              <entry key="thread">
                  <bean class="xx.xx.xx.ThreadScope"></bean>
              </entry>
          </map>
      </property>
  </bean>

  这样就OK了，这个Scope就是每个线程的bean都是同一个

  0