java - How to parse XML file to retrieve certain values -


i have xml file bunch of data

example:

<?xml version="1.0" encoding="utf-8" standalone="no"?> <nodes topic="filingstatus">     <versions>         <version id="tke.calc.fileformat">4</version>         <version id="tke.calc.runtime">1</version>         <version id="tke.gist">12</version>         <version id="tke.mef">1</version>     </versions>     <!-- common -->     <node name="/temporary/filingstatus/singlemaritalstatus">         <inputs>             <input>/return/returndata/ppreturninformation/maritalstatuspp</input>             <input>/constants/irs1040/filingstatus/singlemaritalstatus</input>         </inputs>         <gist>             <equals>                 <inputroles>                     <value>/return/returndata/ppreturninformation/maritalstatuspp</value>                     <value>/constants/irs1040/filingstatus/singlemaritalstatus</value>                 </inputroles>             </equals>         </gist>     </node> <node name="/temporary/filingstatus/divorcedmaritalstatus">     <inputs>         <input>/return/returndata/ppreturninformation/maritalstatuspp</input>         <input>/constants/irs1040/filingstatus/divorcedmaritalstatus</input>     </inputs>     <gist>         <equals>             <inputroles>                 <value>/return/returndata/ppreturninformation/maritalstatuspp</value>                 <value>/constants/irs1040/filingstatus/divorcedmaritalstatus</value>             </inputroles>         </equals>     </gist> </node> </nodes>

i'd way in java parse file , retrieve me data node attribute "name" (like here node name="some text value") , tag value below "gist" tag name here:

    <gist>         <equals> <--------i want value here            ...         </equals>     </gist>

example: example xml posted above, i'd retrieve follow data:

[/temporary/filingstatus/singlemaritalstatus, equals] [/temporary/filingstatus/divorcedmaritalstatus, equals]

so i'd data returned me paired in linked hash map (so order kept in tact).

i prefer avoid dom or stax parsing, think there should nice way of doing via regex. or advisement appreciated.

when want search in xml document, want use xpath expressions:

static map<string, node> parseequalsbyname(string filename) throws ioexception,        xpathexception {      xpath xpath = xpathfactory.newinstance().newxpath();      map<string, node> equalsbyname = new linkedhashmap<>();      try (inputstream file = new bufferedinputstream(                 files.newinputstream(paths.get(filename)))) {          nodelist nodes = (nodelist)             xpath.evaluate("//node", new inputsource(file),                 xpathconstants.nodeset);          int nodecount = nodes.getlength();         (int = 0; < nodecount; i++) {             node node = nodes.item(i);             string name =                 node.getattributes().getnameditem("name").getnodevalue();              node equals = (node)                 xpath.evaluate("gist/equals", node,                     xpathconstants.node);              equalsbyname.put(name, equals);         }     }      return equalsbyname; }

regular expressions bad idea evaluating xml. it's unlikely can handle things comments, cdata sections , character entities.


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