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  /*
   * 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.
  */
 package org.apache.catalina.util;
 
This class is very similar to the java.net.URLEncoder class. Unfortunately, with java.net.URLEncoder there is no way to specify to the java.net.URLEncoder which characters should NOT be encoded. This code was moved from DefaultServlet.java

Author(s):
Craig R. McClanahan
Remy Maucherat
 
 public class URLEncoder {
     protected static final char[] hexadecimal =
     {'0''1''2''3''4''5''6''7''8''9',
      'A''B''C''D''E''F'};
 
     //Array containing the safe characters set.
     protected BitSet safeCharacters = new BitSet(256);
 
     public URLEncoder() {
         for (char i = 'a'i <= 'z'i++) {
             addSafeCharacter(i);
         }
         for (char i = 'A'i <= 'Z'i++) {
             addSafeCharacter(i);
         }
         for (char i = '0'i <= '9'i++) {
             addSafeCharacter(i);
         }
     }
 
     public void addSafeCharacterchar c ) {
     }
 
     public String encodeString path ) {
         int maxBytesPerChar = 10;
         int caseDiff = ('a' - 'A');
         StringBuilder rewrittenPath = new StringBuilder(path.length());
         ByteArrayOutputStream buf = new ByteArrayOutputStream(maxBytesPerChar);
         OutputStreamWriter writer = null;
         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 = (intpath.charAt(i);
             if (.get(c)) {
                 rewrittenPath.append((char)c);
             } else {
                 // convert to external encoding before hex conversion
                 try {
                     writer.write((char)c);
                     writer.flush();
                 } catch(IOException e) {
                     buf.reset();
                     continue;
                 }
                 byte[] ba = buf.toByteArray();
                 for (int j = 0; j < ba.lengthj++) {
                     // Converting each byte in the buffer
                     byte toEncode = ba[j];
                     rewrittenPath.append('%');
                     int low = (int) (toEncode & 0x0f);
                     int high = (int) ((toEncode & 0xf0) >> 4);
                     rewrittenPath.append([high]);
                     rewrittenPath.append([low]);
                 }
                 buf.reset();
             }
         }
         return rewrittenPath.toString();
    }
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