Coldfusion Lucee 4.5.2.018 (Linux) - REST 服务（无法转换字符串）JSON

Question

从事 REST web 服务，我没有太多经验 coldfusion web-services.It 是非常基础的 web-service.Please 如果你们能指出我，我做错了什么。会有很大的帮助。

应用服务器：Lucee 4.5.2.018 (Linux)

请在下面找到我的代码。

组件功能/网络服务。

<cfcomponent rest="true" restpath="/hello">

    <cffunction name="formPost" access="remote" returnType="struct" httpMethod="POST" restPath="/name" hint="POST Method" produces="application/json">
           <cfargument name="firstname" type="String" restArgSource="Form">
           <cfargument name="lastname" type="String" restArgSource="Form">
         <cfset myStruct =  structnew()>  
           <cfset myStruct.FirstName = firstname>
           <cfset myStruct.LastName  = lastname>

            <cfquery name="Qry" datasource="myDSN">
                select col1,col2 from myTableData
            </cfquery>
           <cfset myJsonVar = serializeJSON(Qry) />
           <cfreturn myJsonVar>
    </cffunction>
</cfcomponent>

正在调用网络服务

<cfhttp url="http://mydev:8888/rest/Example/hello/name" method="POST"  result="res"  port="8888" >
        <cfhttpparam type="header" name="Accept" value="application/json">
        <cfhttpparam type="formfield" name="firstname" value="Dan">
        <cfhttpparam type="formfield" name="lastname" value="Gates">
</cfhttp>
<cfdump var="#res#">

问题：定义returnType="struct"时报错string can't cast String [{"COLUMNS":["COL1","COL2"],"DATA":[["0","7777777"],["0","888888"]]}] to a value of type [struct]

定义时returnType="string"没有报错"{\"COLUMNS\":[\"COL1\",\"COL2\"],\"DATA\":[[\"0\",\"7777777\"],[\"0\",\"888888\"]]}"

尝试在循环中获取 [DATA] 值

<cfloop from="1" to="#ArrayLen(d.DATA)#" index="i"> <cfloop from="1" to=#ArrayLen(d.DATA[i])# index="j"> <cfset resultSrt =d.COLUMNS[j]&" = " &d.DATA[i][j]> #resultSrt#<br> </cfloop> </cfloop>

消息：No matching property [DATA] found in [string] 堆栈跟踪：The Error Occurred in /opt/lucee/tomcat/webapps/ROOT/calling.cfm: line 52 50: 51: 52: <cfloop from="1" to="#ArrayLen(d.DATA)#" index="i"> 53: <cfloop from="1" to=#ArrayLen(d.DATA[i])# index="j"> 54: <cfset resultSrt =d.COLUMNS[j]&" = " &d.DATA[i][j]>

Answer 1

首先，由于您要返回查询，因此应将 returnType 设置为 Query。

如果您已将 cffunction 的 produces 属性设置为 application/json，在这种情况下，您不需要在返回数据时执行显式 JSON 序列化。 ColdFusion 会自动为您完成。你可以只写：

<cfreturn Qry />

要读取服务返回的结果，您需要反序列化数据。像这样：

<cfdump var="#deserializeJson(res.filecontent)#">

Coldfusion Lucee 4.5.2.018 (Linux) - REST 服务（无法转换字符串）JSON

Coldfusion Lucee 4.5.2.018 (Linux) - REST service (can't cast String) JSON

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