JAXB example

2012-12-13

JAXB example

You should get a point of how to use JAXB after reading through this code.

XML content to read

<jawabotConfig>

   <settings
      verbose = "true"
      unsecuredShutdown = "false"
      acceptInvitation = "true"
      messageDelay = "1000"
      leaveOnAsk = "true"
      adminUser = "ozizka"
      smtpHost = "smtp.somewhere.com"
      announceEmailTo = "announce@somewhere.com"
      announceEmailFrom = "jawabot-no-reply@somewhere.com"
      announceDefaultChannel = "#jboss"
      debugChannel = "#some"
   />

   <irc>
      <defaultNick>JawaBot-beta</defaultNick>
      <defaultNick2>JawaBot-beta_</defaultNick2>
      <server host="irc.freenode.net">
         <autoJoinChannels>
            #richfaces
            #jboss
         </autoJoinChannels>
      </server>
   </irc>

   <resources>
      <resource name="jawa01" note="EAP"/>
      <resource name="jawa02" note="EAP"/>
   </resources>

   <resourceGroups>
      <group name="brno" channel="#brno" mail="jboss@somewhere.com"> jawa01 jawa02 ...</group>
      <group name="openjdk">jawa16 jawa28 jawa29</group>
   </resourceGroups>

   <userGroups>
      <group name="eap">ozizka rhusar pslavice istudens</group>
      <group name="openjdk">ptisnovs</group>
   </userGroups>

</jawabotConfig>

Root JAXB bean

@XmlRootElement(name="jawabotConfig")
public class ConfigBean {

   @XmlElement
   public SettingsBean settings;

   @XmlElement
   public IrcBean irc;

   @XmlElementWrapper(name="resources")
   @XmlElement(name="resource")
   public List<Resource> resources;
   public List<Resource> getResources() {      return resources;   }


   @XmlElement
   public ResourceGroupsBean resourceGroups;

   @XmlElement
   public UserGroupsBean userGroups;

}// class

Sub-beans for <settings>, <irc>, <resourceGroups>

public class SettingsBean {

   @XmlAttribute public boolean verbose = true;
   @XmlAttribute public boolean acceptInvitation = true;
   @XmlAttribute public int messageDelay = 666;
   @XmlAttribute public boolean leaveOnAsk = true;
   @XmlAttribute public String adminUser = "ozizka";
   @XmlAttribute public String smtpHost = "...";
   @XmlAttribute public String announceEmailTo = "...";
   @XmlAttribute public String announceEmailFrom = "...";
   @XmlAttribute public String announceDefaultChannel = "#jboss";
   @XmlAttribute public String debugChannel = "#some";
   @XmlAttribute public boolean unsecuredShutdown = false;

}// class
public class IrcBean implements Serializable {

   @XmlElement public String defaultNick;

   @XmlElement(name="server") public List<ServerBean> servers;

}// class
public class ServerBean {

   @XmlAttribute public String host;
   @XmlAttribute public Integer port;

   @XmlElement
   @XmlList public List<String> autoJoinChannels;

}// class
public class ResourceGroupsBean implements Serializable {

   /*
   <resourceGroups>
      <group name="soa">jawa01 jawa02 jawa03</group>
      <group name="embjopr">jawa18</group>
   </resourceGroups>
   */

   @XmlElement(name="group")
   List<ResourceGroupBean> groups;

}// class

Code which reads the XML into the bean

String filePath = "myFile.xml"
InputStream is = JawaBot.class.getClassLoader().getResourceAsStream(filePath);
InputStreamReader reader = new InputStreamReader( is );

JAXBContext jc = JAXBContext.newInstance( ConfigBean.class );
Unmarshaller mc = jc.createUnmarshaller();
ConfigBean config = (ConfigBean) mc.unmarshal(reader);
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