Mule ESB从URL字符串下载文件

时间:2012-10-17 23:38:12

标签: esb mule

所以,使用Mule ESB,我正在Bing搜索某些PDF文件。然后我正在解析JSON响应以捕获文件位置的URL。现在我需要检索文件并在本地保存。以下是我到目前为止的情况,但我有一种感觉,我认为这一切都错了。我该如何完成用例?

我遇到两个问题:

1)无法弄清楚如何从#[message.payload.Url]中删除“http”(因为HTTP端点将http添加到我传入的URL中。

2)无法弄清楚如何检索文件。我甚至不知道HTTP端点是否是正确的选择。 HTTP?文件?

<?xml version="1.0" encoding="UTF-8"?>

<mule xmlns:file="http://www.mulesoft.org/schema/mule/file" xmlns:http="http://www.mulesoft.org/schema/mule/http" xmlns:json="http://www.mulesoft.org/schema/mule/json" xmlns:https="http://www.mulesoft.org/schema/mule/https" xmlns="http://www.mulesoft.org/schema/mule/core" xmlns:doc="http://www.mulesoft.org/schema/mule/documentation" xmlns:spring="http://www.springframework.org/schema/beans" version="CE-3.3.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="
http://www.mulesoft.org/schema/mule/json http://www.mulesoft.org/schema/mule/json/current/mule-json.xsd 
http://www.mulesoft.org/schema/mule/http http://www.mulesoft.org/schema/mule/http/current/mule-http.xsd 
http://www.mulesoft.org/schema/mule/https http://www.mulesoft.org/schema/mule/https/current/mule-https.xsd 
http://www.mulesoft.org/schema/mule/file http://www.mulesoft.org/schema/mule/file/current/mule-file.xsd 
http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-current.xsd 
http://www.mulesoft.org/schema/mule/core http://www.mulesoft.org/schema/mule/core/current/mule.xsd ">
    <flow name="BingFlow1" doc:name="BingFlow1">
        <http:inbound-endpoint exchange-pattern="request-response" host="localhost" port="8081" doc:name="HTTP"/>
        <https:outbound-endpoint exchange-pattern="request-response" host="api.datamarket.azure.com" port="443" path="Data.ashx/Bing/Search/v1/Web?Query=%27contract%20california%27&amp;WebFileType=%27PDF%27&amp;$top=50&amp;$format=Json" user="********" password="*****" doc:name="Bing"/>
        <json:json-to-object-transformer returnClass="java.util.Map" doc:name="JSON to Object"/>
        <expression-transformer expression="#[message.payload.d.results]" doc:name="Expression"/>
        <collection-splitter doc:name="Collection Splitter"/>
        <http:outbound-endpoint exchange-pattern="request-response" host="#[message.payload.Url]" port="80" method="GET" doc:name="HTTP"/>
        <file:outbound-endpoint path="/home/user/Documents/output" outputPattern="#[message.payload.ID].pdf" responseTimeout="10000" doc:name="File"/>
        <echo-component doc:name="Echo"/>
    </flow>
</mule>

1 个答案:

答案 0 :(得分:3)

我无法测试流量,因为需要一些凭据,但以下内容可以帮助您:

  • 使用expression-transformer删除HTTP,
  • 使用http:outbound-endpoint后跟file:outbound-endpoint的方法可以正常使用
  • http:inbound-endpoint更改为one-way:由于执行流程被拆分,无法返回任何合理的内容。

例如,假设message.payload.Url解析为java.lang.String,您可以使用:

<expression-transformer expression="#[org.mule.util.StringUtils.substringAfter(message.payload.Url, 'http://')]" doc:name="Expression"/>