• 不加载,手动实例化Service


    //调用方法
    private static IEntityService entityService=(IEntityService) BeanService.getBean("entityService");

     

    //BeanService里面的方法
    private static Map<String, Object> beans;
    static {
      beans = new HashMap<String, Object>();
    }
    public static Object getBean(String beanName) {
      if (beans.containsKey(beanName) && beans.get(beanName) != null) {
        return beans.get(beanName);
      }
      Object bean = BeanUtil.getBean(beanName);
      if (bean != null) {
        beans.put(beanName, bean);
      }
      return bean;
    }

     


     //BeanUtil里面的方法 

    import org.springframework.context.ApplicationContext;
    import org.springframework.context.support.ClassPathXmlApplicationContext;
    import org.springframework.util.StringUtils;
    public class BeanUtil {
      private static ClassPathXmlApplicationContext context;
      private static String flagInit = "0";
      /**
      * 获取spring上下文
      * 
      * @return 上下文容器
      */
      private static ApplicationContext getContext() {
      synchronized (flagInit) {
        if ("0".equals(flagInit)) {
          if (context == null) {
            ClassPathXmlApplicationContext context1 = new ClassPathXmlApplicationContext("spring-config.xml", "spring-mvc.xml");//分别是Spring和MVC的配置文件
            context = context1;
            context.start();
          }
          flagInit = "1";
        }
      }
      return context;
    
    }
    
    static {
    getContext();
    }



    /**
    * 获取bean
    * 
    * @param beanName
    * @return
    */
    public static Object getBean(String beanName) {
      if (StringUtils.isEmpty(beanName)) {
        return null;
      }
      if (getContext() == null) {
        return null;
      }
      return getContext().getBean(beanName);
      }
    }
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  • 原文地址:https://www.cnblogs.com/IceBlueBrother/p/8422852.html
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