java - Using Xpath to add a new value to attributes -


i need use xpath navigate analysis/analysis parameter attributes add in new value:

as first step have tried retrieving value analysis tag cannot work (no sample value being retrieved, no output in console). can see going wrong here , further show how can add new value.

import java.io.file; import java.io.fileinputstream; import java.io.filenotfoundexception; import java.io.ioexception;  import javax.xml.parsers.documentbuilder; import javax.xml.parsers.documentbuilderfactory; import javax.xml.parsers.parserconfigurationexception; import javax.xml.xpath.xpath; import javax.xml.xpath.xpathconstants; import javax.xml.xpath.xpathexpression; import javax.xml.xpath.xpathexpressionexception; import javax.xml.xpath.xpathfactory;  import org.w3c.dom.document; import org.w3c.dom.node; import org.w3c.dom.nodelist; import org.xml.sax.saxexception;  public class xpathtestreports {     public static void main(string[] args) {           try {                    string xpath = "/userdocument/report-plan-catalog/collection/collection/collection/report-config/report-plan/settings[@analysis]";                   fileinputstream file = new fileinputstream(new file("c:/workspace/savedreportscatalog.xml"));                   documentbuilderfactory builderfactory = documentbuilderfactory.newinstance();                   documentbuilder builder = builderfactory.newdocumentbuilder();                   document xmldocument = builder.parse(file);                   xpath xpath = xpathfactory.newinstance().newxpath();                  xpathexpression xpathexpression = xpath.compile(xpath);                  string attributevalue = "" + xpathexpression.evaluate(xmldocument, xpathconstants.string);                  system.out.println(attributevalue);           } catch (filenotfoundexception e) {             e.printstacktrace();         } catch (saxexception e) {             e.printstacktrace();         } catch (ioexception e) {             e.printstacktrace();         } catch (parserconfigurationexception e) {             e.printstacktrace();         } catch (xpathexpressionexception e) {             e.printstacktrace();         }               }  }

xml sample

<?xml version="1.0" encoding="utf-8" standalone="yes"?> <userdocument>   <report-plan-catalog>     <collection timestamp="" title="report plans" uid="">       <collection container-id="" timestamp="2015-04-29" title="*" uid="">         <collection container-id="94533" timestamp="2015-04-29" title="*" uid="5cfc">           <report-config container-id="5cfc" timestamp="2015-04-29" title="asset" type="risk" uid="4718">             <configuration>               <reporttype>live</reporttype>             </configuration>             <report-plan name="asset">               <columns>                 <column name="nom" subtotal-function="sum" total-function="sum"/>                 <column name="id"/>                 <column name="ref"/>               </columns>               <settings analysis="somevalue" analysisparameters="" filtering-enabled="true" object-actions="false" show-object-actions="true" sorting-enabled="true"/>               <viewpoint kind="simple">                 <slices/>          </report-plan>       </report-config>     </collection>   </collection> </collection> </report-plan-catalog> </userdocument>

it's still not clear end goal is, but

/userdocument/report-plan-catalog/collection/collection/collection/report-config/report-plan/settings[@analysis]

selects settings element, given has attribute @analysis, that's predicate (inside angle brackets) means. if not want, use

/userdocument/report-plan-catalog/collection/collection/collection/report-config/report-plan/settings/@analysis

to select @analysis attribute of settings element.

not familiar java, i'll make 2 further guesses:

  • is there perhaps namespace in input document have not shown?

  • perhaps not right way deal attribute nodes. try

    string(/userdocument/report-plan-catalog/collection/collection/collection/report-config/report-plan/settings/@analysis)

edit: tested java code, and

string xpath = "/userdocument/report-plan-catalog/collection/collection/collection/report-config/report-plan/settings/@analysis";

definitely works, after correcting input xml, not well-formed - viewpoint element not closed.

i output:

$ java xpathtestreports somevalue

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