go gin 动态解析post的JSON数据

Posted 2022-03-18 lishuangquan1987

传统方式

在使用gin框架时，每次解析复杂一点的JSON数据，都需要提前写好struct,然后用ShouldBind方法:
post的JSON数据如下：

    "trayCode":"123",
    "batCodes":[
        
            "position":1,
            "batCode":"test1"
        ,
        
            "position":2,
            "batCode":"test2"
        
    ]

提前写好Struct:

type Parameter struct 
	TrayCode string            `json:trayCode`
	BatCodes []BatPositionInfo `json:batCodes`

type BatPositionInfo struct 
	BatCode  string `json:batCode`
	Position int    `json:position`

使用：

func main() 
	r := gin.Default()
	
	r.POST("/post", func(c *gin.Context) 
		p := &ParameterBatCodes: make([]BatPositionInfo, 0)
		err := c.ShouldBind(p)
		if err != nil 
			fmt.Println(err)
		 else 
			fmt.Println(p)
		
		c.JSON(200, gin.H
			"msg": "this is a post msg",
		)
	)

	panic(r.Run(":2500"))

动态方式

动态的方式，不需要提前声明struct,解析的时候，将json解析为map,
然后解析map中的数据

func main() 
	r.POST("/post", func(c *gin.Context) 
		json := make(map[string]interface)
		err := c.BindJSON(&json)
		if err != nil 
			fmt.Printf("bind error:%v\\n", err)
		 else 
			traycode := json["trayCode"]
			fmt.Printf("traycode:%v\\n", traycode)

			obj := json["batCodes"]

			batCodes := make([]BatPositionInfo, 0)
			for _, val := range obj.([]interface) 
				dic, _ := val.(map[string]interface)
				pos := BatPositionInfo
					BatCode:  dic["batCode"].(string),
					Position: int(dic["position"].(float64)),
				
				batCodes = append(batCodes, pos)
			
			fmt.Printf("batCodes:%v\\n", batCodes)
		
		c.JSON(200, gin.H
			"msg": "this is a post msg",
		)
	)
	panic(r.Run(":2500"))