Java tutorial
import java.io.ByteArrayOutputStream; import java.io.File; import java.io.FileInputStream; import java.io.FileOutputStream; import java.io.IOException; import java.io.OutputStreamWriter; import java.util.BitSet; import java.util.Iterator; import java.util.LinkedList; import java.util.Map; import java.util.StringTokenizer; /* Derby - Class org.apache.derby.iapi.util.PropertyUtil Licensed to the Apache Software Foundation (ASF) under one or more contributor license agreements. See the NOTICE file distributed with this work for additional information regarding copyright ownership. The ASF licenses this file to you under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0 Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License. */ public class Main { /** * Array containing the safe characters set as defined by RFC 1738 */ private static BitSet safeCharacters; private static final char[] hexadecimal = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F' }; static { safeCharacters = new BitSet(256); int i; // 'lowalpha' rule for (i = 'a'; i <= 'z'; i++) { safeCharacters.set(i); } // 'hialpha' rule for (i = 'A'; i <= 'Z'; i++) { safeCharacters.set(i); } // 'digit' rule for (i = '0'; i <= '9'; i++) { safeCharacters.set(i); } // 'safe' rule safeCharacters.set('$'); safeCharacters.set('-'); safeCharacters.set('_'); safeCharacters.set('.'); safeCharacters.set('+'); // 'extra' rule safeCharacters.set('!'); safeCharacters.set('*'); safeCharacters.set('\''); safeCharacters.set('('); safeCharacters.set(')'); safeCharacters.set(','); // special characters common to http: file: and ftp: URLs ('fsegment' and 'hsegment' rules) safeCharacters.set('/'); safeCharacters.set(':'); safeCharacters.set('@'); safeCharacters.set('&'); safeCharacters.set('='); } /** * Encode a path as required by the URL specification (<a href="http://www.ietf.org/rfc/rfc1738.txt"> * RFC 1738</a>). This differs from <code>java.net.URLEncoder.encode()</code> which encodes according * to the <code>x-www-form-urlencoded</code> MIME format. * * @param path the path to encode * @return the encoded path */ public static String encodePath(String path) { // stolen from org.apache.catalina.servlets.DefaultServlet ;) /** * Note: Here, ' ' should be encoded as "%20" * and '/' shouldn't be encoded. */ int maxBytesPerChar = 10; StringBuffer rewrittenPath = new StringBuffer(path.length()); ByteArrayOutputStream buf = new ByteArrayOutputStream(maxBytesPerChar); OutputStreamWriter writer; try { writer = new OutputStreamWriter(buf, "UTF8"); } catch (Exception e) { e.printStackTrace(); writer = new OutputStreamWriter(buf); } for (int i = 0; i < path.length(); i++) { int c = path.charAt(i); if (safeCharacters.get(c)) { rewrittenPath.append((char) c); } else { // convert to external encoding before hex conversion try { writer.write(c); writer.flush(); } catch (IOException e) { buf.reset(); continue; } byte[] ba = buf.toByteArray(); for (int j = 0; j < ba.length; j++) { // Converting each byte in the buffer byte toEncode = ba[j]; rewrittenPath.append('%'); int low = (toEncode & 0x0f); int high = ((toEncode & 0xf0) >> 4); rewrittenPath.append(hexadecimal[high]); rewrittenPath.append(hexadecimal[low]); } buf.reset(); } } return rewrittenPath.toString(); } }