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                            ## 概念
監聽器其實就是一個實現特定剪口的普通java程序,這個程序專門用于監聽另一個java對象的方法調用或屬性改編,當被監聽對象發生上述事件后,監聽器某個方法立即被執行.

## 作用
監聽javaweb的三個對象,ServletContext,ServletReuqest,HttpSession.


## 編寫步驟
1. 編寫一個類實現監聽器接口.重寫方法.
2. 編寫配置文件(大部分需要),注冊listener.









                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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