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[TOC]

# 自定義Bean對象

要想序列化傳輸,必須實現序列化接口,需要注意以下7點

1. 必須實現Writable接口
2. 反序列化時,需要反射調用空參構造函數,所以必須有空參構造
3. 重寫序列化方法
4. 重寫反序列化方法
5. 注意反序列化的順序和序列化的順序完全一致
6. 要想把結果顯示在文件中,需要重寫toString()
7. 如果需要將自定義的bean放在key中傳輸,則還需要實現comparable接口,因為mapreduce框中的shuffle過程一定會對key進行排序
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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