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                            添加功能時, 需要上傳文件, 前端用表單 發送的post請求
后臺java post        @ModelAttribute 注解進行實體類接收
~~~
@ModelAttribute 類 obj, MultipartFile file
~~~

需要注意 前端表單里只能放字符串和文件流, 如果不是這兩類前端會自動轉成字符串, 所以編輯時后臺返回的null, 前端或者后臺需要處理一遍, 不然就會變成"null" 提交了
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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