【发布时间】：2016-07-12 06:31:28
【问题描述】：
我目前有一个 MoocJson.json 文件，如下所示：
[
{"body":"some text goes here",
"link":"a link is here",
"name":"name of product goes here",
"language":"language goes here",
"tags":["tag1","tag2","tag3","tag4"],
"initiative":"initiative content goes here",
"start_date":"start date goes here",
"categories":["cat1","cat2","cat3"]
},
{"body":"2 some text goes here",
"link":"2 a link is here",
"name":"2 name of product goes here",
"language":"2 language goes here",
"tags":["2 tag1","2 tag2","2 tag3","2 tag4"],
"initiative":"2 initiative content goes here",
"start_date":"2 start date goes here",
"categories":["2 cat1","2 cat2","2 cat3"]
},
{"body":"3 some text goes here",
"link":"3 a link is here",
"name":"3 name of product goes here",
"language":"3 language goes here",
"tags":["3 tag1","3 tag2"],
"initiative":"2 initiative content goes here",
"start_date":"2 start date goes here",
"categories":["3 cat1"]
}
]
// End of JSON file
我的CF代码如下：
<cffile action="read" file="#ExpandPath("./MoocJson.json")#" variable="myxml">
<cfset mydoc = deserializedJSON(myxml)>
<cfdump var="#mydoc#"> <!--- this dumps out the JSON in Array format --->
<cfoutput> My Doc Length = #arraylen(mydoc)#</cfoutput>
<!--- Loop through Array of mydoc and out put content --->
<cfoutput>
<cfloop from="1" to="#arrayLen(mydoc)#" index="i">
<cfset Course = mydoc[i]>
#Course.Name# <br>
#Course.body# <br>
#Course.language# <br>
#Course.link# <br>
#Course.initiative# <br>
#Course.start_date# <br>
#Course.tags# <br>
#Course.categories# <br>
</cfloop>
</cfoutput>
<!--- End of Code --->
当我运行它时，除了 TAGS 和 CATEGORIES 之外的所有内容都会显示。对于这两个我得到一个错误
复杂对象类型不能转换为简单值
如何读取主数组中的 TAGS 和 CATEGORIES 数组？
【问题讨论】：
-
CFOutput 只能处理简单的值（字符串、数字等）。正如错误信息所说，一些变量，即
tags和categories包含复杂的值，例如数组、结构等，不能用cfoutput 显示。您要么需要将这些数组转换为简单值，as suggested below 要么遍历复杂对象，即数组并输出每个元素（假设数组元素是简单字符串）。 -
顺便说一句，在 CF11 中您可以使用数组循环，即
<cfloop array=".." ....>而不是 from/to 循环。
标签： json multidimensional-array coldfusion coldfusion-11