Sending And Receiving Xml In Java Application
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Sending and receiving XML in a Java application Sean C. Sullivan sean seansullivan <dot> com September 2003
Agenda • XML • XML via HTTP • XML via JMS • XML via JavaMail • XML via FTP
Agenda • XML • XML via HTTP • XML via JMS • XML via JavaMail • XML via FTP
XML XML is a syntax for describing and structuring data Sun Microsystems <stocksymbol>SUNW
Application integration “[If you look at] where XML is really, truly being used right now, it's [for] lightweight, quick and dirty enterprise application integration. […] you could achieve remarkably acceptable results in enterprise application integration simply by binding a set of XML messages to ship back and forth.” Tim Bray, 9/23/2003, news.com interview
Data exchange
Application A
Application B
XML request 97210 <destination>12208 <weight>35 <service>OVERNIGHT
XML response 68.00
Agenda • XML • XML via HTTP • XML via JMS • XML via JavaMail • XML via FTP
HTTP protocol
request HTTP client
HTTP server
HTTP protocol
request HTTP client
HTTP server response
HTTP protocol methods • GET • POST • HEAD • …
HTTP headers • Content-Type • Accept
MIME types for XML • text/xml • application/xml • text/xml-external-parsed-entity • application/xml-external-parsed-entity • application/xml-dtd • application/soap+xml
Jakarta Commons HTTPClient
Example: HTTP POST import org.apache.commons.httpclient.*; import org.apache.commons.httpclient.methods*; PostMethod post = new PostMethod( “http://www.foo.com/bar”); post.setRequestBody(strXML); post.setRequestHeader( “Content-type”, “application/xml”);
Example: HTTP POST post.setRequestHeader( “Accept”, “application/xml”); HttpClient client = new HttpClient(); int result = client.executeMethod(post); // … String strXMLResponse = post.getResponseBodyAsString(); post.releaseConnection();
Receiving XML using a Servlet public class XMLServlet extends javax.servlet.http.HttpServlet { protected void doPost( HttpServletRequest req, HttpServletResponse resp) { // … method implementation … } }
doPost method // … String type = req.getContentType(); int contentLength = req.getContentLength(); char[] xmlData = new char[contentLength]; BufferedReader reader = httpRequest.getReader(); // …
doPost (continued) do { n = reader.read(xmlData, bytesRead, xmlData.length - bytesRead); if (n > 0) { bytesRead += n; } } while ( (n != -1) && (bytesRead < contentLength) )
Agenda • XML • XML via HTTP • XML via JMS • XML via JavaMail • XML via FTP
Java Message Service • messaging API for J2EE platform • Point-to-point – JMS Queue
• Publish-Subscribe – JMS Topic
• “at most once” delivery mode • transactional
JMS message queue
Message Producer
Message Queue 3 2 1
Message Consumer
Sending XML using JMS import javax.jms.*; import javax.naming.*; Queue queue; ConnectionFactory cf; queue = /* lookup via JNDI */; cf = /* lookup via JNDI */; Connection conn = cf.createConnection(); Session session = conn.createSession(…);
Sending XML using JMS MessageProducer producer; producer = session.createProducer(queue); TextMessage msg; msg = session.createTextMessage(); msg.setText(strXML); producer.send(msg); session.commit();
Receiving XML via JMS Choose one: •
javax.jms.MessageConsumer
•
Message Driven Bean (MDB)
Example: Message Driven Bean public void onMessage(Message msg) { // … if (msg instanceof TextMessage) { TextMessage tm = (Message) msg; String strXML = tm.getText(); } // … }
Agenda • XML • XML via HTTP • XML via JMS • XML via JavaMail • XML via FTP
JavaMail
Example: XML via JavaMail import javax.mail.*; import javax.mail.internet.*; Session sess = /* JNDI lookup */; MimeMessage msg = new MimeMessage(sess); msg.setFrom(from); // …
Example: XML via JavaMail // … msg.setRecipients( Message.RecipientType.TO, recipients); msg.setSubject(“Hello XML”); // …
Example: XML via JavaMail // … MimeBodyPart mbp = new MimeBodyPart(); mbp.setContent(strXML, “application/xml”); Multipart mp = new MimeMultipart(); mp.addBodyPart(mbp); msg.setContent(mp); Transport.send(msg); // …
Agenda • XML • XML via HTTP • XML via JMS • XML via JavaMail • XML via FTP
FTP with Jakarta Commons Net
Example: XML via FTP import org.apache.commons.net.ftp.*; FTPClient ftp = new FTPClient(); ftp.connect(“ftp.example.com”); ftp.login(username, password);
Example: XML via FTP
ftp.setFileType(FTP.BINARY_FILE_TYPE); ftp.enterLocalPassiveMode(); ftp.storeFile(“foo.xml”, xmlInputStream); ftp.logout(); ftp.disconnect();
Additional topics… • Sockets • SOAP • XML-RPC • Binary encodings for XML
Additional resources • http://www.w3.org/XML/ • http://www.xml.com/ • http://java.sun.com/xml/ • http://xml.apache.org/ • http://ws.apache.org/axis/ • http://jakarta.apache.org/
Summary Use XML for data exchange between heterogeneous applications. Sending and receiving XML is easy.
Agenda • XML • XML via HTTP • XML via JMS • XML via JavaMail • XML via FTP
Agenda • XML • XML via HTTP • XML via JMS • XML via JavaMail • XML via FTP
XML XML is a syntax for describing and structuring data
Application integration “[If you look at] where XML is really, truly being used right now, it's [for] lightweight, quick and dirty enterprise application integration. […] you could achieve remarkably acceptable results in enterprise application integration simply by binding a set of XML messages to ship back and forth.” Tim Bray, 9/23/2003, news.com interview
Data exchange
Application A
Application B
XML request
XML response
Agenda • XML • XML via HTTP • XML via JMS • XML via JavaMail • XML via FTP
HTTP protocol
request HTTP client
HTTP server
HTTP protocol
request HTTP client
HTTP server response
HTTP protocol methods • GET • POST • HEAD • …
HTTP headers • Content-Type • Accept
MIME types for XML • text/xml • application/xml • text/xml-external-parsed-entity • application/xml-external-parsed-entity • application/xml-dtd • application/soap+xml
Jakarta Commons HTTPClient
Example: HTTP POST import org.apache.commons.httpclient.*; import org.apache.commons.httpclient.methods*; PostMethod post = new PostMethod( “http://www.foo.com/bar”); post.setRequestBody(strXML); post.setRequestHeader( “Content-type”, “application/xml”);
Example: HTTP POST post.setRequestHeader( “Accept”, “application/xml”); HttpClient client = new HttpClient(); int result = client.executeMethod(post); // … String strXMLResponse = post.getResponseBodyAsString(); post.releaseConnection();
Receiving XML using a Servlet public class XMLServlet extends javax.servlet.http.HttpServlet { protected void doPost( HttpServletRequest req, HttpServletResponse resp) { // … method implementation … } }
doPost method // … String type = req.getContentType(); int contentLength = req.getContentLength(); char[] xmlData = new char[contentLength]; BufferedReader reader = httpRequest.getReader(); // …
doPost (continued) do { n = reader.read(xmlData, bytesRead, xmlData.length - bytesRead); if (n > 0) { bytesRead += n; } } while ( (n != -1) && (bytesRead < contentLength) )
Agenda • XML • XML via HTTP • XML via JMS • XML via JavaMail • XML via FTP
Java Message Service • messaging API for J2EE platform • Point-to-point – JMS Queue
• Publish-Subscribe – JMS Topic
• “at most once” delivery mode • transactional
JMS message queue
Message Producer
Message Queue 3 2 1
Message Consumer
Sending XML using JMS import javax.jms.*; import javax.naming.*; Queue queue; ConnectionFactory cf; queue = /* lookup via JNDI */; cf = /* lookup via JNDI */; Connection conn = cf.createConnection(); Session session = conn.createSession(…);
Sending XML using JMS MessageProducer producer; producer = session.createProducer(queue); TextMessage msg; msg = session.createTextMessage(); msg.setText(strXML); producer.send(msg); session.commit();
Receiving XML via JMS Choose one: •
javax.jms.MessageConsumer
•
Message Driven Bean (MDB)
Example: Message Driven Bean public void onMessage(Message msg) { // … if (msg instanceof TextMessage) { TextMessage tm = (Message) msg; String strXML = tm.getText(); } // … }
Agenda • XML • XML via HTTP • XML via JMS • XML via JavaMail • XML via FTP
JavaMail
Example: XML via JavaMail import javax.mail.*; import javax.mail.internet.*; Session sess = /* JNDI lookup */; MimeMessage msg = new MimeMessage(sess); msg.setFrom(from); // …
Example: XML via JavaMail // … msg.setRecipients( Message.RecipientType.TO, recipients); msg.setSubject(“Hello XML”); // …
Example: XML via JavaMail // … MimeBodyPart mbp = new MimeBodyPart(); mbp.setContent(strXML, “application/xml”); Multipart mp = new MimeMultipart(); mp.addBodyPart(mbp); msg.setContent(mp); Transport.send(msg); // …
Agenda • XML • XML via HTTP • XML via JMS • XML via JavaMail • XML via FTP
FTP with Jakarta Commons Net
Example: XML via FTP import org.apache.commons.net.ftp.*; FTPClient ftp = new FTPClient(); ftp.connect(“ftp.example.com”); ftp.login(username, password);
Example: XML via FTP
ftp.setFileType(FTP.BINARY_FILE_TYPE); ftp.enterLocalPassiveMode(); ftp.storeFile(“foo.xml”, xmlInputStream); ftp.logout(); ftp.disconnect();
Additional topics… • Sockets • SOAP • XML-RPC • Binary encodings for XML
Additional resources • http://www.w3.org/XML/ • http://www.xml.com/ • http://java.sun.com/xml/ • http://xml.apache.org/ • http://ws.apache.org/axis/ • http://jakarta.apache.org/
Summary Use XML for data exchange between heterogeneous applications. Sending and receiving XML is easy.
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