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The Java APIs for XML
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public SimpleJavaBean(String name) { setName(name); } // accessor public String getName() { return name; } // modifier public void setName(String name) { this.name = name; } }
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As you can see, this bean implements the JavaBeans contract of providing an accessor and modifier for its single property. We can save this bean to an XML file named simple.xml using the following code snippet:
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import java.beans.XMLEncoder; import java.io.*; ... XMLEncoder e = new XMLEncoder(new BufferedOutputStream( new FileOutputStream("simple.xml"))); e.writeObject(new SimpleJavaBean("Simpleton")); e.close();
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The code above creates an XMLEncoder on top of a java.io.BufferedOutputStream representing the file simple.xml. We then pass the SimpleJavaBean instance reference to the encoder s writeObject method and close the stream. The resulting file contents are as follows:
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< xml version="1.0" encoding="UTF-8" > <java version="1.0" class="java.beans.XMLDecoder"> <object class="SimpleJavaBean"> <void property="name"> <string>Simpleton</string> </void> </object> </java>
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We will not cover the XML syntax in detail, since you do not need to understand it to use this API. Detailed information about this syntax is available in the specification, should you need it.
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Restoring a JavaBean from XML Reading a previously saved JavaBean back into memory is equally simple. Using our SimpleJavaBean example, the bean can be reinstated using the following code:
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XML and Java
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XMLDecoder d = new XMLDecoder( new BufferedInputStream( new FileInputStream("simple.xml"))); SimpleJavaBean result = (SimpleJavaBean) d.readObject(); d.close();
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The XMLDecoder knows how to reconstitute any bean saved using the XMLEncoder component. This API can be a quick and painless way to export your beans to XML for use by other tools and applications. And remember, you can always transform the bean s XML to another format via XSLT to make it more suitable for import into another environment.
JAXM
The Java API for XML Messaging (JAXM) is an enterprise Java API providing a standard access method and transport mechanism for SOAP messaging in Java. It currently includes support for the SOAP 1.1 and SOAP with Attachments specifications. JAXM supports both synchronous and asynchronous messaging. The JAXM specification defines the various services that must be provided by a JAXM implementation provider. Using any compliant implementation, the developer is shielded from much of the complexity of the messaging system, but has full access to the services it provides. Figure 2.11 depicts the JAXM architecture.
J2EE Container
Application Code
Create and Send SOAP Message
Send Message Over HTTP
Receive and Process Message
JAXM Client
JAXM Provider
Receive SOAP Message
Application Code
JAXM architecture
The two main components of the JAXM architecture are the JAXM Client and Provider. The Client is part of the J2EE Web or EJB container that provides access to JAXM services from within your application. The Provider may be implemented in any number of ways and is responsible for sending and receiving SOAP messages. With the infrastructure in place, sending and receiving SOAP messages can be done exclusively through the JAXM API.
The Java APIs for XML
The JAXM API consists of two packages, as summarized in table 2.9. Your components access JAXM services via a ConnectionFactory and Connection interface, in the same way you would obtain a handle to a message queue in the Java Messaging Service (JMS) architecture. After obtaining a Connection, you can use it create a structured SOAP message and send it to a remote host via HTTP(S). JAXM also provides a base Java servlet for you to extend when you need to handle inbound SOAP messages.
Table 2.9 The JAXM API packages
Package name
javax.xml.messaging
Description
Contains the ConnectionFactory and Connection interfaces and supporting objects. Contains the interface to the SOAP protocol objects, including SOAPEnvelope, SOAPHeader, and SOAPBody
javax.xml.soap
At the time of this writing, JAXM 1.0.1 is available as part of the Java XML Pack and is clearly in the lead of all APIs under development in terms of standardizing the transmission of SOAP messages in Java. Since the creation and consumption of SOAP messages is a complex topic, we defer an example of using JAXM to chapter 4. There we use JAXM to create and access web services in J2EE. More information about JAXM can be found at http:/ /java.sun.com/xml/ jaxm/. Details about the Java XML Pack can be found at http:// java.sun.com/xml/javaxmlpack.html.
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