在 mule ESB 中调用 Rest 服务

Question

我制作了一个 web 应用程序，它调用 mule 服务器，它正在 8081 处监听 http 入站点以访问数据库。我正在成功访问数据库并收到一条消息。但是我想在从数据库中获取对象并运行一些操作后访问其他的休息服务。 我不知道如何实现这一点。

请举个例子。我正在发布我的流程。

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

<mule xmlns:json="http://www.mulesoft.org/schema/mule/json" xmlns:jms="http://www.mulesoft.org/schema/mule/jms" xmlns:jersey="http://www.mulesoft.org/schema/mule/jersey" xmlns:db="http://www.mulesoft.org/schema/mule/db" xmlns:tracking="http://www.mulesoft.org/schema/mule/ee/tracking" xmlns:http="http://www.mulesoft.org/schema/mule/http" 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="EE-3.5.1"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="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
http://www.mulesoft.org/schema/mule/http http://www.mulesoft.org/schema/mule/http/current/mule-http.xsd
http://www.mulesoft.org/schema/mule/ee/tracking http://www.mulesoft.org/schema/mule/ee/tracking/current/mule-tracking-ee.xsd
http://www.mulesoft.org/schema/mule/db http://www.mulesoft.org/schema/mule/db/current/mule-db.xsd
http://www.mulesoft.org/schema/mule/jersey http://www.mulesoft.org/schema/mule/jersey/current/mule-jersey.xsd
http://www.mulesoft.org/schema/mule/jms http://www.mulesoft.org/schema/mule/jms/current/mule-jms.xsd
http://www.mulesoft.org/schema/mule/json http://www.mulesoft.org/schema/mule/json/current/mule-json.xsd">
    <http:endpoint exchange-pattern="request-response" host="localhost" port="8081" method="POST" name="HTTP" doc:name="HTTP"/>
    <db:mysql-config name="MySQL_Configuration" host="localhost" port="3306" user="root" password="123456" database="Customer" doc:name="MySQL Configuration"/>
    <flow name="muleesbintegrationFlow1" doc:name="muleesbintegrationFlow1">
        <http:inbound-endpoint exchange-pattern="request-response"   path="crud" doc:name="HTTP" ref="HTTP"/>
        <set-session-variable variableName="input" value="#[message.inboundProperties.'http.query.params'.input]" doc:name="input"/>
        <set-session-variable variableName="cid" value="#[message.inboundProperties.'http.query.params'.cid]" doc:name="cid"/>
        <set-session-variable variableName="fname" value="#[message.inboundProperties.'http.query.params'.fname]" doc:name="fname"/>
        <set-session-variable variableName="lname" value="#[message.inboundProperties.'http.query.params'.fname]" doc:name="lname"/>
        <choice doc:name="ChoicerOfCrud">
            <when expression="#[sessionVars['input']== &quot;insert&quot;]">
                <db:insert config-ref="MySQL_Configuration" doc:name="insert">
                    <db:parameterized-query><![CDATA[INSERT INTO `Customer`.`customer` (`customer_id`, `fname`, `lname`) VALUES (#[sessionVars['cid']], #[sessionVars['fname']],  #[sessionVars['lname']]);]]></db:parameterized-query>
                </db:insert>
            </when>
            <when expression="#[sessionVars['input']]==&quot;update&quot;]">
                <db:update config-ref="MySQL_Configuration" doc:name="update">
                    <db:parameterized-query><![CDATA[UPDATE `Customer`.`customer`  set 
fname =  #[sessionVars['fname']],
lname=  #[sessionVars['lname']]
where customer_id = #[sessionVars['cid']];]]></db:parameterized-query>
                </db:update>
            </when>
            <when expression="#[sessionVars['input']==&quot;select&quot;]">
                <db:select config-ref="MySQL_Configuration" doc:name="selected">
                    <db:parameterized-query><![CDATA[SELECT * FROM Customer.customer where customer_id =#[sessionVars['cid']];]]></db:parameterized-query>
                </db:select>
            </when>
            <otherwise>
                <db:delete config-ref="MySQL_Configuration" doc:name="delete">
                    <db:dynamic-query><![CDATA[DELETE FROM `Customer`.`customer` WHERE `customer_id`=#[sessionVars['cid']];]]></db:dynamic-query>
                </db:delete>
            </otherwise>
        </choice>
    </flow>
</mule>

Answer 1

我建议使用 http:outbound-endpoint 来使用 REST 服务（GET、POST、PUT 或 DELETE）。在此示例中，您可以看到调用服务 GET 的流程：

<flow name="invoke-ws" doc:name="invoke-ws">
    <vm:inbound-endpoint exchange-pattern="request-response" path="vm-ws" doc:name="VM"/>
    <logger message="payload is: #[payload]" level="INFO" doc:name="Logger"/>
    <http:outbound-endpoint exchange-pattern="request-response" method="GET" address="http://ip:port/service/#[payload]" doc:name="HTTP">
        <set-property propertyName="Accept" value="application/json"/>
    </http:outbound-endpoint>
    <byte-array-to-string-transformer doc:name="Byte Array to String"/>
    <logger message="payload is: #[payload]" level="INFO" doc:name="Logger"/>        
</flow> 

如果服务是 SOAP over HTTP，我建议使用 http://www.mulesoft.org/documentation/display/current/Web+Service+Consumer