HTTP GET to download ZIP file

[mborra]

I have a question,

I can to configure spring-integration (or Spring Batch) to get a ZIP file and write the payload to a ZIP file?

I want to use HTTP Client 4.1 to provide credentials (username and password)

Thanks
--Marino

[Gary Russell]

Write a custom Service (invoked by a <service-activator/>) that writes to a ZipOutputStream. There's also a ZipInputStream for reading zips.

I am not sure what relevance HTTP authentication has to this discussion.

[mborra]

Thank you for your relpy Gary,

Write a custom Service (invoked by a <service-activator/>) that writes to a ZipOutputStream. There's also a ZipInputStream for reading zips.

As I wrote in the subject, in fact my first problem is to configure Spring Integration to execute HTTP GET to download a ZIP file and only after this, write the payload (zip file) to a file.

With <service-activator/> i can get input-stream (payload) from <int-http:*inbound*/>

I am not sure what relevance HTTP authentication has to this discussion.

The authentication is required to perform the download.

[Gary Russell]

You have to run the Spring Integration HTTP inbound gateway in a Web Container (e.g. Tomcat); the container handles the authentication and it has nothing to do with Spring Integration.

If the zip file already exists, why do you need Spring Integration? Just return it as a static web resource.

If you need to create the file dynamically based on the request, do as I said, and write a service to get the request from the gateway, process it, create the zip file and return it.

[Cleric]

Hi!

As I understand you need to invoke external service who returns you a ZIP.
So, I recommend something like this:

<bean id="messageSender" class="org.springframework.ws.transport.http.HttpComponentsMessageSender">
		<property name="credentials">
			<bean class="org.apache.commons.httpclient.UsernamePasswordCredentials"
				  c:userName="username" c:password="password"/>
		</property>
    </bean>

    <bean id="clientHttpRequestFactory" class="org.springframework.http.client.HttpComponentsClientHttpRequestFactory"
		  depends-on="messageSender"
          p:httpClient="#{messageSender.httpClient}"/>

<http:outbound-gateway request-channel="getZipChannel" http-method="GET"
						   expected-response-type="byte[]"
						   url="http://host/ext-service?zipName={zipName}"
						   request-factory="clientHttpRequestFactory">
    <http:uri-variable name="zipName" expression="payload"/>
</http:outbound-gateway>

Take care,
Artem

[mborra]

Hi,

Hi!

As I understand you need to invoke external service who returns you a ZIP.

Yes! This is my problem.

So, I recommend something like this:

<bean id="messageSender" class="org.springframework.ws.transport.http.HttpComponentsMessageSender">
		<property name="credentials">
			<bean class="org.apache.commons.httpclient.UsernamePasswordCredentials"
				  c:userName="username" c:password="password"/>
		</property>
    </bean>

    <bean id="clientHttpRequestFactory" class="org.springframework.http.client.HttpComponentsClientHttpRequestFactory"
		  depends-on="messageSender"
          p:httpClient="#{messageSender.httpClient}"/>

<http:outbound-gateway request-channel="getZipChannel" http-method="GET"
						   expected-response-type="byte[]"
						   url="http://host/ext-service?zipName={zipName}"
						   request-factory="clientHttpRequestFactory">
    <http:uri-variable name="zipName" expression="payload"/>
</http:outbound-gateway>

Thank you Cleric, this is a good starting point, I imagined a similar solution, but i don't know how I can schedule outbound-gateway at fixed (cron) time, and then I've discarded my solution.

--Marino

[Mark Fisher]

Have a look at this section of the reference manual:
http://static.springsource.org/sprin...espace-inbound

You can define an inbound-channel-adapter with a cron-based poller that is upstream (e.g. its "channel" could be the "request-channel" of an outbound-gateway), and it can even include just an expression rather than ref+method if sufficient.

[mborra]

You have to run the Spring Integration HTTP inbound gateway in a Web Container (e.g. Tomcat); the container handles the authentication and it has nothing to do with Spring Integration.

If the zip file already exists, why do you need Spring Integration? Just return it as a static web resource.

My application is a stand-alone, I can not run it in a Web Container.

I need Spring Integration for many other operations. Download the ZIP is just the first.

[Gary Russell]

Sorry, your question was not clear to me; I thought you were talking about serving up a zip file to a client - as Mark and Cleric have pointed out, if your app is the client then you can use an http outbound adapter.

[mborra]

Sorry, your question was not clear to me;

No problem! Sometimes it is not easy to be clear.

I thought you were talking about serving up a zip file to a client - as Mark and Cleric have pointed out, if your app is the client then you can use an http outbound adapter.

Thank you very much anyway.