参数问题：nested exception is : For input string: “null“，已解决。

• 出现问题：nested exception is : For input string: “null“

: Failed to convert value of type '' to required type ''; nested exception is : For input string: "null"
	at (:133)
	at (:121)
	at (:167)
	at (:134)
	at (:105)
	at (:878)
	at (:792)
	at (:87)
	at (:1040)
	at (:943)
	at (:1006)
	at (:898)

• 出现原因：前端传值时把这个数据当成空值传 null
• 但是后端接受是String类型 将null当作“null”字符接收。
• 解决：前端当前值为空就不传，或者后端使用Integer接收该参数。