package xml;import java.io.File;import org.dom4j.DocumentException;import org.dom4j.io.SAXReader;public class XmlReader_Dom4j {    public static void main(String[] args)  {        String path = "D:\\test\\中文文件夹名\\namespaces.xml";        readXml(path);//will throw exception        File xmlFile=new File(path);        readXml(xmlFile);        path = "D:\\test\\path withWhiteSpace\\namespaces.xml";        readXml(path);                path = "D:\\test\\normal\\namespaces.xml";        readXml(path);    }    private static void readXml(String path) {        SAXReader saxReader=new SAXReader();        try {            saxReader.read(path);            System.out.println("success");        } catch (DocumentException e) {            e.printStackTrace();        }    }        private static void readXml(File xmlFile) {        SAXReader saxReader=new SAXReader();        try {            saxReader.read(xmlFile);            System.out.println("success");        } catch (DocumentException e) {            e.printStackTrace();        }    }            }

org.dom4j.DocumentException: unknown protocol: d Nested exception: unknown protocol: d    at org.dom4j.io.SAXReader.read(SAXReader.java:484)    at org.dom4j.io.SAXReader.read(SAXReader.java:321)    at xml.XmlReader_Dom4j.readXml(XmlReader_Dom4j.java:24)    at xml.XmlReader_Dom4j.main(XmlReader_Dom4j.java:11)Nested exception: java.net.MalformedURLException: unknown protocol: d    at java.net.URL.<init>(Unknown Source)    at java.net.URL.<init>(Unknown Source)    at java.net.URL.<init>(Unknown Source)    at com.sun.org.apache.xerces.internal.impl.XMLEntityManager.setupCurrentEntity(Unknown Source)    at com.sun.org.apache.xerces.internal.impl.XMLVersionDetector.determineDocVersion(Unknown Source)    at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(Unknown Source)    at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(Unknown Source)    at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(Unknown Source)    at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(Unknown Source)    at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.parse(Unknown Source)    at org.dom4j.io.SAXReader.read(SAXReader.java:465)    at org.dom4j.io.SAXReader.read(SAXReader.java:321)    at xml.XmlReader_Dom4j.readXml(XmlReader_Dom4j.java:24)    at xml.XmlReader_Dom4j.main(XmlReader_Dom4j.java:11)Nested exception: java.net.MalformedURLException: unknown protocol: d    at java.net.URL.<init>(Unknown Source)    at java.net.URL.<init>(Unknown Source)    at java.net.URL.<init>(Unknown Source)    at com.sun.org.apache.xerces.internal.impl.XMLEntityManager.setupCurrentEntity(Unknown Source)    at com.sun.org.apache.xerces.internal.impl.XMLVersionDetector.determineDocVersion(Unknown Source)    at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(Unknown Source)    at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(Unknown Source)    at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(Unknown Source)    at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(Unknown Source)    at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.parse(Unknown Source)    at org.dom4j.io.SAXReader.read(SAXReader.java:465)    at org.dom4j.io.SAXReader.read(SAXReader.java:321)    at xml.XmlReader_Dom4j.readXml(XmlReader_Dom4j.java:24)    at xml.XmlReader_Dom4j.main(XmlReader_Dom4j.java:11)successsuccesssuccess

    /**     * <p>     * Reads a Document from the given URL or filename using SAX.     * </p>     *      * <p>     * If the systemId contains a <code>‘:‘</code> character then it is     * assumed to be a URL otherwise its assumed to be a file name. If you want     * finer grained control over this mechansim then please explicitly pass in     * either a {@link URL}or a {@link File}instance instead of a {@link     * String} to denote the source of the document.     * </p>     *      * @param systemId     *            is a URL for a document or a file name.     *      * @return the newly created Document instance     *      * @throws DocumentException     *             if an error occurs during parsing.     */    public Document read(String systemId) throws DocumentException {        InputSource source = new InputSource(systemId);        if (this.encoding != null) {            source.setEncoding(this.encoding);        }        return read(source);    }

    private static void testWithUrl() throws MalformedURLException {        System.out.println("=============testWithUrlBegin=============");                String path = "file:///D:\\test\\中文文件夹名\\namespaces.xml";        newUrl(path);        readXml(path);                path = "D:\\test\\中文文件夹名\\namespaces.xml";        newUrl(path);                System.out.println("=============testWithUrlEnd=============");    }    private static void newUrl(String path) throws MalformedURLException {        try {            new URL(path);        } catch (Exception e) {            e.printStackTrace();        }    }    private static void readXml(String path) {        SAXReader saxReader=new SAXReader();        try {            Document document=saxReader.read(path);            System.out.println("document.hasContent():"+document.hasContent());            System.out.println("success");        } catch (DocumentException e) {            e.printStackTrace();        }    }

=============testWithUrlBegin=============document.hasContent():truesuccessjava.net.MalformedURLException: unknown protocol: d    at java.net.URL.<init>(Unknown Source)    at java.net.URL.<init>(Unknown Source)    at java.net.URL.<init>(Unknown Source)    at xml.XmlReader_Dom4j.newUrl(XmlReader_Dom4j.java:50)    at xml.XmlReader_Dom4j.testWithUrl(XmlReader_Dom4j.java:43)    at xml.XmlReader_Dom4j.main(XmlReader_Dom4j.java:13)=============testWithUrlEnd=============

    /**     * <p>     * Reads a Document from the given <code>File</code>     * </p>     *      * @param file     *            is the <code>File</code> to read from.     *      * @return the newly created Document instance     *      * @throws DocumentException     *             if an error occurs during parsing.     */    public Document read(File file) throws DocumentException {        try {            /*             * We cannot convert the file to an URL because if the filename             * contains ‘#‘ characters, there will be problems with the URL in             * the InputSource (because a URL like             * http://myhost.com/index#anchor is treated the same as             * http://myhost.com/index) Thanks to Christian Oetterli             */            InputSource source = new InputSource(new FileInputStream(file));            if (this.encoding != null) {                source.setEncoding(this.encoding);            }            String path = file.getAbsolutePath();            if (path != null) {                // Code taken from Ant FileUtils                StringBuffer sb = new StringBuffer("file://");                // add an extra slash for filesystems with drive-specifiers                if (!path.startsWith(File.separator)) {                    sb.append("/");                }                path = path.replace(‘\\‘, ‘/‘);                sb.append(path);                source.setSystemId(sb.toString());            }            return read(source);        } catch (FileNotFoundException e) {            throw new DocumentException(e.getMessage(), e);        }    }

    /**     * Creates a <code>URL</code> object from the specified     * <code>protocol</code>, <code>host</code>, <code>port</code>     * number, <code>file</code>, and <code>handler</code>. Specifying     * a <code>port</code> number of <code>-1</code> indicates that     * the URL should use the default port for the protocol. Specifying     * a <code>handler</code> of <code>null</code> indicates that the URL     * should use a default stream handler for the protocol, as outlined     * for:     *     java.net.URL#URL(java.lang.String, java.lang.String, int,     *                      java.lang.String)     *     * <p>If the handler is not null and there is a security manager,     * the security manager‘s <code>checkPermission</code>     * method is called with a     * <code>NetPermission("specifyStreamHandler")</code> permission.     * This may result in a SecurityException.     *     * No validation of the inputs is performed by this constructor.     *     * @param      protocol   the name of the protocol to use.     * @param      host       the name of the host.     * @param      port       the port number on the host.     * @param      file       the file on the host     * @param       handler    the stream handler for the URL.     * @exception  MalformedURLException  if an unknown protocol is specified.     * @exception  SecurityException     *        if a security manager exists and its     *        <code>checkPermission</code> method doesn‘t allow     *        specifying a stream handler explicitly.     * @see        java.lang.System#getProperty(java.lang.String)     * @see        java.net.URL#setURLStreamHandlerFactory(     *            java.net.URLStreamHandlerFactory)     * @see        java.net.URLStreamHandler     * @see        java.net.URLStreamHandlerFactory#createURLStreamHandler(     *            java.lang.String)     * @see        SecurityManager#checkPermission     * @see        java.net.NetPermission     */    public URL(String protocol, String host, int port, String file,           URLStreamHandler handler) throws MalformedURLException {    if (handler != null) {            SecurityManager sm = System.getSecurityManager();            if (sm != null) {                // check for permission to specify a handler                checkSpecifyHandler(sm);            }        }    protocol = protocol.toLowerCase();        this.protocol = protocol;     if (host != null) {            /**         * if host is a literal IPv6 address,             * we will make it conform to RFC 2732         */            if (host != null && host.indexOf(‘:‘) >= 0                    && !host.startsWith("[")) {                host = "["+host+"]";            }            this.host = host;        if (port < -1) {        throw new MalformedURLException("Invalid port number :" +                                                    port);        }            this.port = port;        authority = (port == -1) ? host : host + ":" + port;    }    Parts parts = new Parts(file);        path = parts.getPath();        query = parts.getQuery();        if (query != null) {            this.file = path + "?" + query;        } else {            this.file = path;        }    ref = parts.getRef();        // Note: we don‘t do validation of the URL here. Too risky to change        // right now, but worth considering for future reference. -br        if (handler == null &&            (handler = getURLStreamHandler(protocol)) == null) {            throw new MalformedURLException("unknown protocol: " + protocol);        }        this.handler = handler;    }