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。我已经设置了一个代理服务，其中包含 out 序列中的 foreach 中介器和有效负载工厂以及日志语句，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，但是在循环结束时，各个元素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，我看到的大多数例子不仅有一个带有数组的元素，而且只有一个数组。有人知道这是否可能吗？
原始终结点返回如下内容：
[
{"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所示：
[
{"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...
]
代理的实际回报如下：
{"name": "first record",
"bounds":"[[-0.256,51.531],[-0.102,51.656]]"}
代理的配置如下：
<?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>
您可以尝试将其作为解决方法吗：
<?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]]"}]}
为每个中介器会将拆分的表达式添加到根元素中，所以我这样做了，
<api context="/foreach" name="foreach" xmlns="http://ws.apache.org/ns/synapse">
<resource methods="GET">
<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">
</log>
<foreach expression="//jsonArray/jsonElement">
<sequence>
<payloadFactory media-type="xml">
<format>
<result xmlns="">
<name>$1</name>
<bounds>$2</bounds>
</result>
</format>
<args>
<arg evaluator="json" expression="$.displayName"/>
<arg evaluator="json" expression="$.bounds"/>
</args>
</payloadFactory>
</sequence>
</foreach>
<property name="messageType" scope="axis2" type="STRING" value="application/json"/>
<log level="full"/>
<respond/>
</inSequence>
<outSequence>
<send/>
</outSequence>
<faultSequence/>
</resource>
</api>
我得到了这样的回应
{ "result": [{"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]]}]}