最經在做專案的時候，呼叫某個介面的時候為了呼叫地圖，而不希望因為呼叫超時影響到主執行緒，使用了spring的時間監聽機制。

Spring中提供一些Aware相關的介面，BeanFactoryAware、 ApplicationContextAware、ResourceLoaderAware、ServletContextAware等等，其中最常用到的是ApplicationContextAware。實現ApplicationContextAware的Bean，在Bean被初始後，將會被注入ApplicationContext的例項。ApplicationContextAware提供了publishEvent()方法，實現Observer(觀察者)設計模式的事件傳播機，提供了針對Bean的事件傳播功能。通過Application.publishEvent方法，我們可以將事件通知系統內所有的ApplicationListener。

Spring事件處理一般過程：

◆定義Event類，繼承org.springframework.context.ApplicationEvent。
◆編寫釋出事件類Publisher，實現org.springframework.context.ApplicationContextAware介面。
◆覆蓋方法setApplicationContext(ApplicationContext applicationContext)和釋出方法publish(Object obj)。
◆定義時間監聽類EventListener，實現ApplicationListener介面，實現方法onApplicationEvent(ApplicationEvent event)。

專案中的虛擬碼

1. 定義Event類，繼承org.springframework.context.ApplicationEvent。

  public class Gis0002SuccessEvent extends ApplicationEvent
{

    /**
      * <B>Summary:</B> <Br> 
      * serialVersionUID:TODO（用一句話描述這個變量表示什麼） <Br> 
      *
      * @since Ver @version
      */    
    private
 
 static final long   serialVersionUID    = 1L;

    public Gis0002SuccessEvent ( GiS0002 source )
    {

          super ( source );
    }

}

2.編寫釋出事件類Publisher，實現org.springframework.context.ApplicationContextAware介面。
3.覆蓋方法setApplicationContext(ApplicationContext applicationContext)和釋出方法publish(Object obj)。

public class AgA01003ServiceImpl implements AgA01003Service,ApplicationContextAware{
    //把救援人的資訊傳給地圖  2015.07.21
    public void dealMapMoniter(AgA01003Entity aga01003Entity){
        GiS0002 giS0002 = new GiS0002();
        log.info("--救援監控救援人資訊資料---"+JsonUtil.toJSONString ( aga01003Entity ));
        /******************以下是處理工單服務人員資訊資料  begin*****************************/
        giS0002.setTicketID  ( aga01003Entity.getTicketID ( ) );//工單編號
        giS0002.setRescueName  ( aga01003Entity.getRescueName ( ) );//救援人員名稱
        giS0002.setRescuePhone  ( aga01003Entity.getRescuePhone ( ) );//救援人員電話
        //giS0002.setRealServiceType( aga01003Entity.getServiceCode ( ) );//服務專案程式碼
        //設定服務中文名稱 edit by zhaolei 2015-08-03
        String serviceName = sendMessageService.getSpTypeMateDataNameByCode(aga01003Entity.getServiceCode ( ));
        giS0002.setRealServiceType( serviceName );//服務專案程式碼
        giS0002.setRescueLatitude  ( aga01003Entity.getCaseLatitude ( ) );
        giS0002.setRescueLongitude ( aga01003Entity.getCaseLongitude ( ) );
        giS0002.setRescueVehicleNo  ( aga01003Entity.getRescueVehicleNo ( ) );//車牌號

        //因呼叫地圖時，如超時，會影響到主流程，所以改為監聽 2015.08.10
        this.ac.publishEvent ( new Gis0002SuccessEvent ( giS0002 ) );
    }
}

定義時間監聽類EventListener，實現ApplicationListener介面，實現方法onApplicationEvent(ApplicationEvent event)。

public class Gis0002Listener implements SmartApplicationListener
{

    Logger log = LoggerFactory.getLogger ( Gis0002Listener.class );
    @Resource( name = "dictionaryService" )
    private DictionaryService           dictionaryService;
    @Resource(name="logManagerSerivce")
    private LogManagerSerivceImpl logManageService;
    @Override
    @Async //配置成非同步處理資料
    public void onApplicationEvent ( ApplicationEvent arg0 )
    {
        GiS0002  giS0002 = (GiS0002)arg0.getSource ( );

        Enum enums = dictionaryService.searchByCode (   InitSpring.getMessage ( "RUNTIMEENUM" ) ,
                "monitorRescue" );
            //從配置庫中取得介面url
        String urlName = enums.getName ( );
        log.info("救援監控救援人資訊介面="+urlName);

        JacksonJsonSimpleMarshaller sm = new JacksonJsonSimpleMarshaller ( );
        String resJson = sm.marshaller ( giS0002 ,new ByteArrayOutputStream ( ) );
        log.info("救援監控救援人資訊請求引數="+resJson);
        List<NameValuePair> json =  new ArrayList<NameValuePair> ( );
        json.add ( new BasicNameValuePair ( "RequestBodyJson" , resJson ) );
        try
        {
            //呼叫救援緘口地圖
            String returnData = HttpUtils.httpPost (urlName , json );
            log.info("救援監控救援人資訊介面返回="+JsonUtil.toJSONString ( returnData ));

            if( returnData.matches ( ".*404.*" ) ){
                logManageService.saveLog ( giS0002 , returnData ,"" , 
                                             "", giS0002.getTicketID ( ) , 
                                               "1" , Contants.GiS0002 );
            }

        }
        catch ( HttpHostConnectException e )
        {
              log.error ( e.getMessage ( ) );
              logManageService.saveLog ( giS0002 , "" ,e.getMessage ( ) , 
                                         "", giS0002.getTicketID ( ) , 
                                           "1" , Contants.GiS0002 );
        }

    }

    @Override
    public int getOrder ( )
    {
          return 1;
    }

    @Override
    public boolean supportsEventType ( Class<? extends ApplicationEvent> eventType )
    {
          return eventType == Gis0002SuccessEvent.class;
    }

    @Override
    public boolean supportsSourceType ( Class<?> sourceType )
    {
          return sourceType ==GiS0002.class;
    }

}