A small problem with Java Properties and its simple use

Because of a small program to optimize, so specifically to learn the properties, but encountered a problem is almost crazy ...

* * 1. Functional Description

**
Generate and Read property XML file 2. Source Code

The initial source code is as follows:

Package test;
Import java.util.*;

Import java.io.*; public class Propertiesfiletest {public static void main (string[] args) {//propertiestofile (Properties pro,st
          Ring FilePath) Properties Pro = new properties ();     
          Pro.setproperty ("width", "15");

        Pro.setproperty ("width", "15");


        Propertiesfiletest.propertiestofile (Pro, "D://config2.xml");
        * Properties Pro2 = Propertiesfiletest.propertiesfromfile (Pro, "D://config2.xml");
    System.out.println (Pro2.getproperty ("from")); */} public static void Propertiestofile (Properties pro,string filePath) {try{File t
                Arget_file = new file (FilePath);
                if (target_file.exists () ==false) target_file.createnewfile ();
                FileOutputStream fos = new FileOutputStream (FilePath);
                OS = new OutputStream (target_file);
                Pro.storetoxml (FOS, null); Fos.write (prO.size ());
            Fos.flush ();
            catch (IOException ex) {ex.printstacktrace ();
    } System.out.println ("Properties have been written to" + FilePath); public static Properties Propertiesfromfile (Properties pro,string filePath) {try{File tar
                Get_file = new file (FilePath);
                    if (target_file.exists () ==true) {FileInputStream fis =new fileinputstream (FilePath);
                    OS = new OutputStream (target_file); Fis.read (); One more read causes file problems, no longer XML pro.loadfromxml (FIS);
                    Seemingly does not support UTF-8//pro.load (FIS);
                    Pro.list (System.out);    
                System.out.println ("File have been read to Properties"); 
                else {System.out.println ("config file doesn ' t exists!");
          }

            }  catch (IOException ex) {ex.printstacktrace ();   
            System.out.println ("There is a exception, please check it!");
        return pro;
 }

}

3. Error

As follows:

Properties have been written to D://config2.xml Java.util.InvalidPropertiesFormatException:
    Org.xml.sax.SAXParseException:Content is isn't allowed in Prolog. At Java.util.XMLUtils.load (xmlutils.java:59) at Java.util.Properties.loadFromXML (properties.java:852) at Test. Propertiesfiletest.propertiesfromfile (propertiesfiletest.java:60) at Test. Propertiesfiletest.main (propertiesfiletest.java:28) caused by:org.xml.sax.SAXParseException:Content is not allowed
    In Prolog. At Com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.createSAXParseException (Errorhandlerwrapper.java : 195) at Com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.fatalError (errorhandlerwrapper.java:174) at C Om.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError (xmlerrorreporter.java:388) at Com.sun.org.apache.xerces.internal.impl.XMLScanner.reportFatalError (xmlscanner.java:1411) at Com.sun.org.apache.xerces.internal.impl.xmldocumentscannerimpl$prologdriver.nexT (xmldocumentscannerimpl.java:1038) at Com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next ( xmldocumentscannerimpl.java:648) at Com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument ( xmldocumentfragmentscannerimpl.java:510) at Com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse ( xml11configuration.java:807) at Com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse (  xml11configuration.java:737) at Com.sun.org.apache.xerces.internal.parsers.XMLParser.parse (xmlparser.java:107) at Com.sun.org.apache.xerces.internal.parsers.DOMParser.parse (domparser.java:225) at Com.sun.org.apache.xerces.internal.jaxp.DocumentBuilderImpl.parse (documentbuilderimpl.java:283) at Java.util.XMLUtils.getLoadingDoc (xmlutils.java:85) at Java.util.XMLUtils.load (xmlutils.java:57) ...
3 More There are a exception, please check it!
 Null

4. Problem positioning Solution

Functions read from XML file Propertiesfromfile
Wrote one more.
Fis.read ();

Causes the XML file to be less than one byte of data, so it always appears
Invalidpropertiesformatexception exception. 5. For reference

Http://www.yiibai.com/java/util/properties_loadfromxml.html