golang json序列和反序列化 omitempty

╰+哭是因爲堅強的太久メ 2023-05-29 15:28 16阅读 0赞

golang json 使用了`omitempty`注解应该使用指针定义数据，否则序列化 int的0值，string的"" 会和理解的有偏差，注意下面两图输出结果的区别

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3gzNTY5ODI2MTE_size_16_color_FFFFFF_t_70]  
id和order输出正常  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3gzNTY5ODI2MTE_size_16_color_FFFFFF_t_70 1]

id为0 order为""没有json字符串中没有输出

package main
    
    import (
    	"encoding/json"
    	"fmt"
    )
    
    var jsonBlob = []byte(`[ {"Name": "c++", "Order": "1","id":0}, {"Name": "lua", "Order": ""}, {"Name": "golang"} ]`)
    
    type Book struct { 
    	Name  string `json:"name"`
    	Order string `json:"order,omitempty"`
    	ID    int    `json:"id,omitempty"`
    }
    
    func main() { 
    
    	var books []Book
    	err := json.Unmarshal(jsonBlob, &books)
    	if err != nil { 
    		fmt.Println("error:", err)
    	}
    	fmt.Printf("%+v \n", books)
    
    	data, err := json.Marshal(books)
    	if err != nil { 
    		fmt.Printf(err.Error())
    		return
    	}
    
    	fmt.Printf("data:%v \n", string(data))
    
    }

\#\#\#参考

> https://blog.csdn.net/xk18791196562/article/details/85328749  
> http://static.markbest.site/blog/71.html

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3gzNTY5ODI2MTE_size_16_color_FFFFFF_t_70]: https://img-blog.csdnimg.cn/20191106213203918.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3gzNTY5ODI2MTE=,size_16,color_FFFFFF,t_70
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3gzNTY5ODI2MTE_size_16_color_FFFFFF_t_70 1]: https://img-blog.csdnimg.cn/20191106213217480.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3gzNTY5ODI2MTE=,size_16,color_FFFFFF,t_70