How to read XML using XPath in Java -


i want read xml data using xpath in java, information have gathered not able parse xml according requirement.

here want do:

get xml file online via url, use xpath parse it, want create 2 methods in it. 1 in enter specific node attribute id, , child nodes result, , second suppose want specific child node value only

<?xml version="1.0"?> <howto>   <topic name="java">       <url>http://www.rgagnonjavahowto.htm</url>   <car>taxi</car>   </topic>   <topic name="powerbuilder">        <url>http://www.rgagnon/pbhowto.htm</url>        <url>http://www.rgagnon/pbhowtonew.htm</url>   </topic>   <topic name="javascript">         <url>http://www.rgagnon/jshowto.htm</url>   </topic>  <topic name="vbscript">        <url>http://www.rgagnon/vbshowto.htm</url>  </topic>  </howto>

in above example want read elements if search via @name , 1 function in want url @name 'javascript' return 1 node element.

i hope cleared question :)

thanks.

kai

you need along lines of this:

documentbuilderfactory factory = documentbuilderfactory.newinstance(); documentbuilder builder = factory.newdocumentbuilder(); document doc = builder.parse(<uri_as_string>); xpathfactory xpathfactory = xpathfactory.newinstance(); xpath xpath = xpathfactory.newxpath(); xpathexpression expr = xpath.compile(<xpath_expression>);

then call expr.evaluate() passing in document defined in code , return type expecting, , cast result object type of result.

if need specific xpath expressions, should ask separate questions (unless question in first place here - understood question how use api in java).

edit: (response comment): xpath expression text of first url element under powerbuilder:

/howto/topic[@name='powerbuilder']/url/text()

this second:

/howto/topic[@name='powerbuilder']/url[2]/text()

you code:

expr.evaluate(doc, xpathconstants.string);

if don't know how many urls in given node, should rather this:

xpathexpression expr = xpath.compile("/howto/topic[@name='powerbuilder']/url"); nodelist nl = (nodelist) expr.evaluate(doc, xpathconstants.nodeset);

and loop on nodelist.


Comments

Post a Comment

Popular posts from this blog

What is happening when Matlab is starting a "parallel pool"? -

running parallel cpu processes in matlab starts command parpool() according documentation , function: [creates] special job on pool of workers, , [connects] matlab client parallel pool. this function takes bit of time execute, on order of 30 seconds. in other multi-cpu paradigms openmp, parallel execution seems totally transparent -- i've never noticed behavior analogous matlab (granted i'm not experienced parallel programming). so, happening between time parpool() called , when finishes executing? takes long? parallel computing toolbox enables run matlab code in parallel using several different paradigms (e.g. jobs , tasks, parfor , spmd , parfeval , batch processing), , run either locally (parallelised across cores in local machine) or remotely (parallelised across machines in cluster - either 1 own, or 1 in cloud). in of these cases, code run on matlab workers , copies of matlab without interactive desktop. if you're intending run on remo...
Read more

angular - DownloadURL return null in below code -

when change file updated in firebase storage when try downloadurl show null. filechange(event: any) { const imagefolder: string = this.employee.id; const filelist: filelist = event.target.files; const file: file = filelist[0]; const storageref = firebase.storage().ref().child(`${imagefolder}/profile.jpg`).put(file); console.log(storageref.snapshot.downloadurl); } the put() asynchronous. if want url after file uploaded have this: firebase.storage().ref().child(`${imagefolder}/profile.jpg`).put(file).then((snapshot) => { storageref = snapshot.downloadurl: console.log(snapshot.downloadurl); });
Read more

php - Cannot override Laravel Spark authentication with own implementation -

during login process of laravel spark need request token of remote api. api stores exact same users , passwords laravel spark application. therefore need username , non hashed password of user during authentication process. i thought overriding authenticated method solution problem. in routes/web.php override post /login endpoint , pointing endpoint own logincontroller: <?php namespace app\http\controllers\auth; use illuminate\support\facades\log; use illuminate\http\request; use laravel\spark\http\controllers\auth\logincontroller sparklogincontroller; class logincontroller extends sparklogincontroller { /** * create new login controller instance. * * @return void */ public function __construct() { parent::__construct(); } /** * handle successful authentication attempt. * * @param request $request * @param \illuminate\contracts\auth\authenticatable $user * @return response */ public fu...
Read more