wso2 - 使用 foreach 中介器通过 WSO2 ESB 转换 JSON 数组

Question

我正在使用 WSO2 ESB V4.9.0 为需要返回转换后的 JSON 数组的指定端点创建代理服务。我已经在输出序列中设置了一个带有 foreach 中介器和有效负载工厂的代理服务以及日志语句，以查看发生了什么。结果是每个单独的数组元素都按预期进行转换，但是各个元素在循环结束时不会合并回单个数组正如文档似乎暗示的那样。结果是只返回最后一个元素。

我唯一能看到的是，我见过的大多数示例不仅仅是一个带有数组的元素，而不仅仅是一个数组。有人知道这是否可能吗？

原始端点返回如下内容:

[
{"id": "1",
"type": "object",
"name": "first",
"bounds":"[[-0.256,51.531],[-0.102,51.656]]",
"displayName": "first record"},

{"id": "2",
"type": "object",
"name": "second",
"bounds":"[[-0.256,51.531],[-0.102,51.656]]",
"displayName": "second record"},
..etc...
]

代理服务所需的返回如下:

[
{"name": "first record",
"bounds":"[[-0.256,51.531],[-0.102,51.656]]"},
{"name": "second record",
"bounds":"[[-0.256,51.531],[-0.102,51.656]]"},
..etc...
]

代理的实际返回如下:

{"name": "first record",
"bounds":"[[-0.256,51.531],[-0.102,51.656]]"}

代理的配置在这里:

<?xml version="1.0" encoding="UTF-8"?>
<proxy xmlns="http://ws.apache.org/ns/synapse"
       name="newfeed_v2"
       transports="https,http"
       statistics="disable"
       trace="disable"
       startOnLoad="true">
   <target>
      <inSequence>
         <log/>
      </inSequence>
      <outSequence>
         <log level="full">
            <property name="MESSAGE" value="FIRST"/>
         </log>
         <foreach id="foreach_1" expression="//jsonArray/jsonElement">
            <sequence>
               <payloadFactory media-type="json">
                  <format>{ 
   "name" : "$1", 
   "bounds" : "$2"  
}</format>
                  <args>
                     <arg evaluator="json" expression="$.displayName"/>
                     <arg evaluator="json" expression="$.bounds"/>
                  </args>
               </payloadFactory>
                <log level="full">
                  <property name="MESSAGE" value="ENDLOOP"/>
               </log>
            </sequence>
         </foreach>
         <log level="full">
            <property name="MESSAGE" value="LAST"/>
         </log>
         <log/>
         <send/>
      </outSequence>
      <endpoint>
         <address uri="https://api.backend.com"/>
      </endpoint>
   </target>
   <description/>
</proxy>

Answer 1

您可以尝试以下解决方法吗:

<?xml version="1.0" encoding="UTF-8"?>
<proxy xmlns="http://ws.apache.org/ns/synapse"
       name="newfeed_v2"
       transports="https,http"
       statistics="disable"
       trace="disable"
       startOnLoad="true">
   <target>
      <inSequence>
         <payloadFactory media-type="json">
            <format>[
            {"id": "1",
            "type": "object",
            "name": "first",
            "bounds":"[[-0.256,51.531],[-0.102,51.656]]",
            "displayName": "first record"},

            {"id": "2",
            "type": "object",
            "name": "second",
            "bounds":"[[-0.256,51.531],[-0.102,51.656]]",
            "displayName": "second record"},

            {"id": "4",
            "type": "object",
            "name": "tercero",
            "bounds":"[[-0.256,51.531],[-0.102,51.656]]",
            "displayName": "tercer record"}
            ]

            </format>
            <args/>
         </payloadFactory>
         <log level="full"/>
         <loopback/>
      </inSequence>
      <outSequence>
         <log level="full">
            <property name="MESSAGE" value="FIRST"/>
         </log>
         <property name="Person" scope="default">
            <value xmlns=""/>
         </property>
         <foreach id="foreach_1" expression="//jsonArray/jsonElement">
            <sequence>
               <payloadFactory media-type="json">
                  <format>{
                            "name" : "$1",
                            "bounds" : "$2"
                            }
                  </format>
                  <args>
                     <arg evaluator="json" expression="$.displayName"/>
                     <arg evaluator="json" expression="$.bounds"/>
                  </args>
               </payloadFactory>
               <enrich>
                  <source clone="true" xpath="$body//jsonObject"/>
                  <target action="child" xpath="$ctx:Person"/>
               </enrich>
               <log level="full">
                  <property name="MESSAGE1" value="ENDLOOP"/>
               </log>
            </sequence>
         </foreach>
         <enrich>
            <source clone="true" xpath="$ctx:Person"/>
            <target type="body"/>
         </enrich>
         <log level="full">
            <property name="MESSAGE" value="ENDLOOP"/>
         </log>
         <!--property name="messageType" value="text/xml" scope="axis2" type="STRING"/--><log level="full">
            <property name="TRANSFORMED MESSAGE" value="LAST"/>
         </log>
         <send/>
      </outSequence>
      <faultSequence/>
   </target>
   <description/>
</proxy>

我的回应:

{"value":[{"name":"first record","bounds":"[[-0.256,51.531],[-0.102,51.656]]"},{"name":"second record","bounds":"[[-0.256,51.531],[-0.102,51.656]]"},{"name":"tercer record","bounds":"[[-0.256,51.531],[-0.102,51.656]]"}]}