Use ActiveMQ to transfer files and use Jetty to build an embedded file server

Use Active to send files

 

ActiveMq provides support for file transfer.

1. directly transfer files: use the form of connection. createOutputStream. This method is suitable for small files. You cannot transmit large files.

2. BlobMessage: (Binary Large OBjects) This method can transmit Large files. In essence, when a BlobMessage is sent, the file is first transmitted to the file server, and then received from the file server. In this way, what we transmit in mq is actually a file ID.

 

This article introduces the second method. MQ itself comes with the jetty startup method.

        ActiveMQConnectionFactory fac = new ActiveMQConnectionFactory(ActiveMQConnectionFactory.DEFAULT_USER, ActiveMQConnectionFactory.DEFAULT_PASSWORD, "tcp://localhost:61616?jms.blobTransferPolicy.defaultUploadUrl=http://localhost:8161/fileserver/");

        Connection createConnection = fac.createConnection();

        createConnection.start();

        ActiveMQSession activeMQSession = (ActiveMQSession) createConnection.createSession(false, Session.AUTO_ACKNOWLEDGE);

        File file = new File("D:\\1.html");

        BlobMessage createBlobMessage = activeMQSession.createBlobMessage(file);

        Queue createQueue = activeMQSession.createQueue("test.blobmessage");

        MessageProducer createProducer = activeMQSession.createProducer(createQueue);

        createProducer.send(createBlobMessage);

        createConnection.close();

 

In this way, a BlobMessage message can be sent, and the receiving process of the receiver is similar. I will not repeat it.

However, when I use the server that comes with ActiveMQ as a file server, the following error occurs during file upload: PUT was not successful: 401 Unauthorized. So I decided to build my own jetty-based file server.

 

Build a jetty Server

1. First add jetty dependencies or introduce the jetty jar package:

    <dependency>

      <groupId>org.eclipse.jetty.aggregate</groupId>

      <artifactId>jetty-all-server</artifactId>

      <version>7.6.4.v20120524</version>

    </dependency>

2. svn from the http://svn.apache.org/repos/asf/activemq/trunk/activemq-fileserver/ gets the three classes that MQ provides file services. Introduce your own project

3. Create your own Server class and add the following code:

 

        Server server = new Server(8080);  

        ServletContextHandler  handler = new ServletContextHandler ();  

        handler.setResourceBase(".");    

        handler.setContextPath("/fileserver");  

        System.out.println(handler.getServletContext().getRealPath("/"));   

        handler.addFilter(org.apache.activemq.util.FilenameGuardFilter.class, "/*", DispatcherType.FORWARD.ordinal() );  

        handler.addFilter(org.apache.activemq.util.RestFilter.class, "/*", DispatcherType.FORWARD.ordinal() );  

        ServletHolder defaultServlet = new ServletHolder();  

        defaultServlet.setName("DefaultServlet");  

        defaultServlet.setClassName("org.eclipse.jetty.servlet.DefaultServlet");  

        handler.addServlet(defaultServlet, "/*");  

        server.setHandler( handler );  

        server.start();  

4. Start the Server class. Note: Modify the URL setting port when ConnectionFactory is created. The above server is set to 8080, so the link address should be:

Tcp: // localhost: 61616? Jms. blobTransferPolicy. defaultUploadUrl = http: // localhost: 8080/fileserver/

5. This completes the process of building an MQ file server. Resend the file and accept the file!

 

Jetty Embedded Server references: http://wiki.eclipse.org/Jetty/Tutorial/Embedding_Jetty

This article MQ content reference http://blog.csdn.net/kimmking/article/details/9421343