java - Iterate XML input stream with System.out.println() -


i importing xml file inputstream , trying unmarshalling using jaxb. want read out in input stream can better diagnose subsequent steps. how iterate through xml content in inputstream?

here method needs iterate inputstream: 

public static <t> t unmarshal( class<t> docclass, inputstream inputstream )throws jaxbexception {     string packagename = docclass.getpackage().getname();     jaxbcontext jc = jaxbcontext.newinstance( packagename );     unmarshaller u = jc.createunmarshaller();     int r;     try {         while ((r = inputstream.read()) > 0) {         //how iterate inputstream?         //system.out.println() each line in xml file         }     } catch (ioexception e) {e.printstacktrace();}     object object = u.unmarshal( inputstream );//this throws error.  want see inside     system.out.println(object.getclass());     system.out.println(jaxbintrospector.getvalue(object).getclass());     jaxbelement<t> doc = (jaxbelement<t>)object;//u.unmarshal( inputstream );     return doc.getvalue(); }

just kicks, code calls above method is: 

public static void main( string[] args ) {     string filename = "c:\\temp\\jaxb\\apps\\create-marshal\\po.xml";     inputstream = getinputstream(filename);     try { unmarshal(businessdocument.class, is);}      catch (jaxbexception e) {e.printstacktrace();} }  public static inputstream getinputstream(string filename){     inputstream = null;     try {         = new fileinputstream(filename);     }     catch (filenotfoundexception e) {e.printstacktrace();}     catch (ioexception e) {e.printstacktrace();}     return is; }

edit:

the output in console running @rp- 's code following: 

<?xml version="1.0"?> <businessdocument>     <typeid root="docroot1" extension="docext1"/>     <documenttitle>first document</documenttitle>     <entity1>         <typeid root="innerroot1" extension="innerext1"/>         <entitytitle>inner title</entitytitle>     </entity1> </businessdocument> javax.xml.bind.unmarshalexception  - linked exception: [org.xml.sax.saxparseexception: premature end of file.]     @ javax.xml.bind.helpers.abstractunmarshallerimpl.createunmarshalexception(abstractunmarshallerimpl.java:315)     @ com.sun.xml.internal.bind.v2.runtime.unmarshaller.unmarshallerimpl.createunmarshalexception(unmarshallerimpl.java:505)     @ com.sun.xml.internal.bind.v2.runtime.unmarshaller.unmarshallerimpl.unmarshal0(unmarshallerimpl.java:206)     @ com.sun.xml.internal.bind.v2.runtime.unmarshaller.unmarshallerimpl.unmarshal(unmarshallerimpl.java:173)     @ javax.xml.bind.helpers.abstractunmarshallerimpl.unmarshal(abstractunmarshallerimpl.java:137)     @ javax.xml.bind.helpers.abstractunmarshallerimpl.unmarshal(abstractunmarshallerimpl.java:184)     @ mainpackage.main.unmarshal(main.java:44)     @ mainpackage.main.main(main.java:18) caused by: org.xml.sax.saxparseexception: premature end of file.     @ com.sun.org.apache.xerces.internal.util.errorhandlerwrapper.createsaxparseexception(errorhandlerwrapper.java:195)     @ com.sun.org.apache.xerces.internal.util.errorhandlerwrapper.fatalerror(errorhandlerwrapper.java:174)     @ com.sun.org.apache.xerces.internal.impl.xmlerrorreporter.reporterror(xmlerrorreporter.java:388)     @ com.sun.org.apache.xerces.internal.impl.xmlscanner.reportfatalerror(xmlscanner.java:1414)     @ com.sun.org.apache.xerces.internal.impl.xmldocumentscannerimpl$prologdriver.next(xmldocumentscannerimpl.java:1059)     @ com.sun.org.apache.xerces.internal.impl.xmldocumentscannerimpl.next(xmldocumentscannerimpl.java:648)     @ com.sun.org.apache.xerces.internal.impl.xmlnsdocumentscannerimpl.next(xmlnsdocumentscannerimpl.java:140)     @ com.sun.org.apache.xerces.internal.impl.xmldocumentfragmentscannerimpl.scandocument(xmldocumentfragmentscannerimpl.java:511)     @ com.sun.org.apache.xerces.internal.parsers.xml11configuration.parse(xml11configuration.java:808)     @ com.sun.org.apache.xerces.internal.parsers.xml11configuration.parse(xml11configuration.java:737)     @ com.sun.org.apache.xerces.internal.parsers.xmlparser.parse(xmlparser.java:119)     @ com.sun.org.apache.xerces.internal.parsers.abstractsaxparser.parse(abstractsaxparser.java:1205)     @ com.sun.org.apache.xerces.internal.jaxp.saxparserimpl$jaxpsaxparser.parse(saxparserimpl.java:522)     @ com.sun.xml.internal.bind.v2.runtime.unmarshaller.unmarshallerimpl.unmarshal0(unmarshallerimpl.java:200)     ... 5 more

in general can use bufferedreader read streams. 

bufferedreader in = new bufferedreader(new inputstreamreader(inputstream)); string line = null; while ((line = in.readline()) != null) {     system.out.println(line); }

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