Parse xml to initialize the database, parse xml to initialize

Parse xml to initialize the database, parse xml to initialize

To facilitate the development or launch of the project, you may need to initialize the database, including users, permissions, or some other basic data. I use the parsing Xml file to initialize the database.

 

(1) The Xml file format is as follows:

 

 

(2) configure the Servlet for initialization data

Configure in web. xml

<Servlet>

<Servlet-name> PersistenceTest </servlet-name>

<Servlet-class> com. saving. ecm. servlet. PersistenceInitialize </servlet-class>

<Load-on-startup> 2 </load-on-startup>

</Servlet>

 

(3) load the Servlet when the Tomcat server is started

Public class PersistenceInitialize extends HttpServlet {

Private static final long serialVersionUID = 1L;

Private static final String FILEPATH = "initDataBase. xml ";

 

@ Override

Public void init () throws ServletException {

Super. init ();

Try {

// If the user data count = 0

Document document = new

SAXReader (). read (Thread. currentThread (). getContextClassLoader ()

. GetResourceAsStream (FILEPATH ));

InitUser (document); // initialize the user

} Catch (Throwable e ){

E. printStackTrace ();

}

}

 

@ SuppressWarnings ("unchecked ")

Private void initUser (Document document ){

List <Node> childNodes = document. selectNodes ("// users/user ");

CommonAction <User> action = new CommonAction <User> (User. class );

For (Node node: childNodes ){

User user;

Try {

User = action. findById (Long. parseLong (node. valueOf ("@ id ")));

If (user = null ){

User = new User ();

 

}

User. setAccount (node. valueOf ("@ account "));

User. setName (node. valueOf ("@ name "));

User. setPassword (MD5Util. md5 (node. valueOf ("@ password ")));

User. setEmail (node. valueOf ("@ email "));

User. setRoleCode (node. valueOf ("@ roleCode "));

User. setStatus (node. valueOf ("@ status "));

User. setCreationTime (System. currentTimeMillis ());

Action. saveEntity (user );

 

} Catch (Throwable e ){

E. printStackTrace ();

}

 

}

}

 

}