extract string from xml java -

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i receive xml string client 

<?xml version="1.0" encoding="utf-8"?> <esp:interface version="1.0" xmlns:esp="http://***confidential****/"> <esp:transaction actioncode="approve" cardnumber="474849********28" expirydate="0824"      responsecode="00" terminalid="03563001" track2="474849********28=08241261234"      transactionamount="300" transactionid="00051" type="purchase" localdate="0823"      localtime="152006" posoperatorid="1234" authorizationnumber="123456" messagetype="referal"> </esp:transaction> </esp:interface>

i want extract each string like

actioncode="approve"  cardnumber="474849********28"  expirydate="0824"  responsecode="00"  terminalid="03563001"  track2="474849********28=08241261234"  transactionamount="300"  transactionid="00051"  type="purchase"  localdate="0823"  localtime="152006"  posoperatorid="1234"  authorizationnumber="123456"  messagetype="referal"

i used xpath read xml string gives me error

inputsource source = new inputsource(new stringreader(sxmldata));//sxmldata contains xml string       documentbuilderfactory dbf = documentbuilderfactory.newinstance(); documentbuilder db = dbf.newdocumentbuilder(); document document = db.parse(source);  xpathfactory xpathfactory = xpathfactory.newinstance(); xpath xpath = xpathfactory.newxpath();  string msg = xpath.evaluate("/esp:interface/esp:transaction", document);  system.out.println("msg= " + msg);

error :

msg : /* coming blank */

i referred these 2 links didnt parse xml simple string using java xpath , simplest way query xml in java

how can these individual strings xml ... using build in xml or old substring method (inefficient)

that sounds have forbidden characters before <?xml ...?>. make sure file correctly saved utf-8 , no whitespace before declaration.

to parse attributes, in simple case, i'd recommend sax parser:

public class mysaxhandler extends defaulthandler {     public static void main(string[] args) throws throwable {         string sxmldata = "<?xml version=\"1.0\" encoding=\"utf-8\"?>\r\n"                 + "<esp:interface version=\"1.0\" xmlns:esp=\"http://***confidential****/\">\r\n"                 + "<esp:transaction actioncode=\"approve\" cardnumber=\"474849********28\" expirydate=\"0824\" \r\n"                 + "    responsecode=\"00\" terminalid=\"03563001\" track2=\"474849********28=08241261234\" \r\n"                 + "    transactionamount=\"300\" transactionid=\"00051\" type=\"purchase\" localdate=\"0823\" \r\n"                 + "    localtime=\"152006\" posoperatorid=\"1234\" authorizationnumber=\"123456\" messagetype=\"referal\">\r\n"                 + "</esp:transaction>\r\n" + "</esp:interface>";         inputsource source = new inputsource(new stringreader(sxmldata));         xmlreader reader = xmlreaderfactory.createxmlreader();         reader.setcontenthandler(new mysaxhandler());         reader.parse(source);     }      @override     public void startelement(string uri, string localname, string qname,               attributes atts) throws saxexception {         if (qname.equals("esp:transaction")) {             (int = 0; < atts.getlength(); i++) {                 system.out.println(atts.getqname(i) + "=\"" + atts.getvalue(i) + "\"");             }         }     } }

gives output:

actioncode="approve" cardnumber="474849********28" expirydate="0824" responsecode="00" terminalid="03563001" track2="474849********28=08241261234" transactionamount="300" transactionid="00051" type="purchase" localdate="0823" localtime="152006" posoperatorid="1234" authorizationnumber="123456" messagetype="referal"

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