http://jakarta.apache.org/httpcomponents/httpclient-3.x/: The HttpClient component supports the client-side of RFC 1945 (HTTP/1.0) and RFC 2616 (HTTP/1.1) , several related specifications (RFC 2109 (Cookies) , RFC 2617 (HTTP Authentication) , etc.), and provides a framework by which new request types (methods) or HTTP extensions can be created easily. (Apache Software Foundation)
  • Armando Anton
  • Sebastian Bazley
  • Ola Berg
  • Sam Berlin
  • Mike Bowler
  • Samit Jain
  • Eric Johnson
  • Christian Kohlschuetter
  • Ryan Lubke
  • Sam Maloney
  • Rob Di Marco
  • Juergen Pill
  • Mohammad Rezaei
  • Roland Weber
  • Laura Werner
  • Mikael Wilstrom
  • Michael Becke ()
  • Jeff Dever (Independent consultant)
  • dIon Gillard (Multitask Consulting)
  • Ortwin Glueck ()
  • Sung-Gu ()
  • Oleg Kalnichevski
  • Sean C. Sullivan (Independent consultant)
  • Adrian Sutton (Intencha)
  • Rodney Waldhoff (Britannica) 
/*
 * $Header: /home/jerenkrantz/tmp/commons/commons-convert/cvs/home/cvs/jakarta-commons//httpclient/src/java/org/apache/commons/httpclient/util/URIUtil.java,v 1.27 2004/05/05 20:34:01 olegk Exp $
 * $Revision: 507321 $
 * $Date: 2007-02-14 01:10:51 +0100 (Wed, 14 Feb 2007) $
 *
 * ====================================================================
 *
 *  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.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 *
 */

package org.apache.commons.httpclient.util;

import java.util.BitSet;

import org.apache.commons.codec.DecoderException;
import org.apache.commons.codec.net.URLCodec;
import org.apache.commons.httpclient.URI;
import org.apache.commons.httpclient.URIException;


The URI escape and character encoding and decoding utility. It's compatible with HttpURL rather than URI. 
Author:Sung-Gu
Version:$Revision: 507321 $ $Date: 2002/03/14 15:14:01
/**
 * The URI escape and character encoding and decoding utility.
 * It's compatible with {@link org.apache.commons.httpclient.HttpURL} rather
 * than {@link org.apache.commons.httpclient.URI}.
 *
 * @author <a href="mailto:jericho@apache.org">Sung-Gu</a>
 * @version $Revision: 507321 $ $Date: 2002/03/14 15:14:01 
 */
public class URIUtil {

    // ----------------------------------------------------- Instance variables

    protected static final BitSet empty = new BitSet(1);

    // ---------------------------------------------------------- URI utilities

    
Get the basename of an URI.   It's possibly an empty string.

Params:
  • uri – a string regarded an URI
Returns:the basename string; an empty string if the path ends with slash
/**
     * Get the basename of an URI.   It's possibly an empty string.
     *
     * @param uri a string regarded an URI
     * @return the basename string; an empty string if the path ends with slash
     */
    public static String getName(String uri) {
        if (uri == null || uri.length() == 0) { return uri; } 
        String path = URIUtil.getPath(uri);
        int at = path.lastIndexOf("/");
        int to = path.length();
        return (at >= 0) ? path.substring(at + 1, to) : path;
    }


    
Get the query of an URI.

Params:
  • uri – a string regarded an URI
Returns:the query string; null if empty or undefined
/**
     * Get the query of an URI.
     *
     * @param uri a string regarded an URI
     * @return the query string; <code>null</code> if empty or undefined
     */
    public static String getQuery(String uri) {
        if (uri == null || uri.length() == 0) { return null; } 
        // consider of net_path
        int at = uri.indexOf("//");
        int from = uri.indexOf(
            "/", 
            at >= 0 ? (uri.lastIndexOf("/", at - 1) >= 0 ? 0 : at + 2) : 0
        );
        // the authority part of URI ignored
        int to = uri.length();
        // reuse the at and from variables to consider the query
        at = uri.indexOf("?", from);
        if (at >= 0) {
            from = at + 1;
        } else {
            return null;
        }
        // check the fragment
        if (uri.lastIndexOf("#") > from) {
            to = uri.lastIndexOf("#");
        }
        // get the path and query.
        return (from < 0 || from == to) ? null : uri.substring(from, to);
    }


    
Get the path of an URI.

Params:
  • uri – a string regarded an URI
Returns:the path string
/**
     * Get the path of an URI.
     *
     * @param uri a string regarded an URI
     * @return the path string
     */
    public static String getPath(String uri) {
        if (uri == null) {
            return null;
        } 
        // consider of net_path
        int at = uri.indexOf("//");
        int from = uri.indexOf(
            "/", 
            at >= 0 ? (uri.lastIndexOf("/", at - 1) >= 0 ? 0 : at + 2) : 0
        );
        // the authority part of URI ignored 
        int to = uri.length();
        // check the query
        if (uri.indexOf('?', from) != -1) {
            to = uri.indexOf('?', from);
        }
        // check the fragment
        if (uri.lastIndexOf("#") > from && uri.lastIndexOf("#") < to) {
            to = uri.lastIndexOf("#");
        }
        // get only the path.
        return (from < 0) ? (at >= 0 ? "/" : uri) : uri.substring(from, to);
    }


    
Get the path and query of an URI.

Params:
  • uri – a string regarded an URI
Returns:the path and query string
/**
     * Get the path and query of an URI.
     *
     * @param uri a string regarded an URI
     * @return the path and query string
     */
    public static String getPathQuery(String uri) {
        if (uri == null) {
            return null;
        } 
        // consider of net_path
        int at = uri.indexOf("//");
        int from = uri.indexOf(
            "/", 
            at >= 0 ? (uri.lastIndexOf("/", at - 1) >= 0 ? 0 : at + 2) : 0
        );
        // the authority part of URI ignored
        int to = uri.length();
        // Ignore the '?' mark so to ignore the query.
        // check the fragment
        if (uri.lastIndexOf("#") > from) {
            to = uri.lastIndexOf("#");
        }
        // get the path and query.
        return (from < 0) ? (at >= 0 ? "/" : uri) : uri.substring(from, to);
    }


    
Get the path of an URI and its rest part.

Params:
  • uri – a string regarded an URI
Returns:the string from the path part
/**
     * Get the path of an URI and its rest part.
     *
     * @param uri a string regarded an URI
     * @return the string from the path part
     */
    public static String getFromPath(String uri) {
        if (uri == null) {
            return null;
        } 
        // consider of net_path
        int at = uri.indexOf("//");
        int from = uri.indexOf(
            "/", 
            at >= 0 ? (uri.lastIndexOf("/", at - 1) >= 0 ? 0 : at + 2) : 0
        );
        // get the path and its rest.
        return (from < 0) ? (at >= 0 ? "/" : uri) : uri.substring(from);
    }

    // ----------------------------------------------------- Encoding utilities

    
Get the all escaped and encoded string with the default protocl charset.
It's the same function to use encode(String unescaped, Bitset
empty, URI.getDefaultProtocolCharset()).

Params:
  • unescaped – an unescaped string
Throws:
  • URIException – if the default protocol charset is not supported
See Also:
Returns:the escaped string
/**
     * Get the all escaped and encoded string with the default protocl charset.
     * It's the same function to use <code>encode(String unescaped, Bitset
     * empty, URI.getDefaultProtocolCharset())</code>.
     *
     * @param unescaped an unescaped string
     * @return the escaped string
     * 
     * @throws URIException if the default protocol charset is not supported
     *
     * @see URI#getDefaultProtocolCharset
     * @see #encode
     */
    public static String encodeAll(String unescaped) throws URIException {
        return encodeAll(unescaped, URI.getDefaultProtocolCharset());
    }
 

    
Get the all escaped and encoded string with a given charset.
It's the same function to use encode(String unescaped, Bitset
empty, String charset).

Params:
  • unescaped – an unescaped string
  • charset – the charset
Throws:
See Also:
Returns:the escaped string
/**
     * Get the all escaped and encoded string with a given charset.
     * It's the same function to use <code>encode(String unescaped, Bitset
     * empty, String charset)</code>.
     *
     * @param unescaped an unescaped string
     * @param charset the charset
     * @return the escaped string
     * 
     * @throws URIException if the charset is not supported
     * 
     * @see #encode
     */
    public static String encodeAll(String unescaped, String charset)
        throws URIException {

        return encode(unescaped, empty, charset);
    }
  

    
Escape and encode a string regarded as within the authority component of
an URI with the default protocol charset.
Within the authority component, the characters ";", ":", "@", "?", and
"/" are reserved.

Params:
  • unescaped – an unescaped string
Throws:
  • URIException – if the default protocol charset is not supported
See Also:
Returns:the escaped string
/**
     * Escape and encode a string regarded as within the authority component of
     * an URI with the default protocol charset.
     * Within the authority component, the characters ";", ":", "@", "?", and
     * "/" are reserved.
     *
     * @param unescaped an unescaped string
     * @return the escaped string
     * 
     * @throws URIException if the default protocol charset is not supported
     * 
     * @see URI#getDefaultProtocolCharset
     * @see #encode
     */
    public static String encodeWithinAuthority(String unescaped)
        throws URIException {

        return encodeWithinAuthority(unescaped, URI.getDefaultProtocolCharset());
    }


    
Escape and encode a string regarded as within the authority component of
an URI with a given charset.
Within the authority component, the characters ";", ":", "@", "?", and
"/" are reserved.

Params:
  • unescaped – an unescaped string
  • charset – the charset
Throws:
See Also:
Returns:the escaped string
/**
     * Escape and encode a string regarded as within the authority component of
     * an URI with a given charset.
     * Within the authority component, the characters ";", ":", "@", "?", and
     * "/" are reserved.
     *
     * @param unescaped an unescaped string
     * @param charset the charset
     * @return the escaped string
     * 
     * @throws URIException if the charset is not supported
     * 
     * @see #encode
     */
    public static String encodeWithinAuthority(String unescaped, String charset)
        throws URIException {

        return encode(unescaped, URI.allowed_within_authority, charset);
    }


    
Escape and encode a string regarded as the path and query components of
an URI with the default protocol charset.

Params:
  • unescaped – an unescaped string
Throws:
  • URIException – if the default protocol charset is not supported
See Also:
Returns:the escaped string
/**
     * Escape and encode a string regarded as the path and query components of
     * an URI with the default protocol charset.
     *
     * @param unescaped an unescaped string
     * @return the escaped string
     * 
     * @throws URIException if the default protocol charset is not supported
     * 
     * @see URI#getDefaultProtocolCharset
     * @see #encode
     */
    public static String encodePathQuery(String unescaped) throws URIException {
        return encodePathQuery(unescaped, URI.getDefaultProtocolCharset());
    }


    
Escape and encode a string regarded as the path and query components of
an URI with a given charset.

Params:
  • unescaped – an unescaped string
  • charset – the charset
Throws:
See Also:
Returns:the escaped string
/**
     * Escape and encode a string regarded as the path and query components of
     * an URI with a given charset.
     *
     * @param unescaped an unescaped string
     * @param charset the charset
     * @return the escaped string
     * 
     * @throws URIException if the charset is not supported
     * 
     * @see #encode
     */
    public static String encodePathQuery(String unescaped, String charset)
        throws URIException {

        int at = unescaped.indexOf('?');
        if (at < 0) {
            return encode(unescaped, URI.allowed_abs_path, charset);
        }
        // else
        return  encode(unescaped.substring(0, at), URI.allowed_abs_path, charset)
            + '?' + encode(unescaped.substring(at + 1), URI.allowed_query, charset);
    }


    
Escape and encode a string regarded as within the path component of an
URI with the default protocol charset.
The path may consist of a sequence of path segments separated by a
single slash "/" character.  Within a path segment, the characters
"/", ";", "=", and "?" are reserved.

Params:
  • unescaped – an unescaped string
Throws:
  • URIException – if the default protocol charset is not supported
See Also:
Returns:the escaped string
/**
     * Escape and encode a string regarded as within the path component of an
     * URI with the default protocol charset.
     * The path may consist of a sequence of path segments separated by a
     * single slash "/" character.  Within a path segment, the characters
     * "/", ";", "=", and "?" are reserved.
     *
     * @param unescaped an unescaped string
     * @return the escaped string
     * 
     * @throws URIException if the default protocol charset is not supported
     * 
     * @see URI#getDefaultProtocolCharset
     * @see #encode
     */
    public static String encodeWithinPath(String unescaped)
        throws URIException {

        return encodeWithinPath(unescaped, URI.getDefaultProtocolCharset());
    }


    
Escape and encode a string regarded as within the path component of an
URI with a given charset.
The path may consist of a sequence of path segments separated by a
single slash "/" character.  Within a path segment, the characters
"/", ";", "=", and "?" are reserved.

Params:
  • unescaped – an unescaped string
  • charset – the charset
Throws:
See Also:
Returns:the escaped string
/**
     * Escape and encode a string regarded as within the path component of an
     * URI with a given charset.
     * The path may consist of a sequence of path segments separated by a
     * single slash "/" character.  Within a path segment, the characters
     * "/", ";", "=", and "?" are reserved.
     *
     * @param unescaped an unescaped string
     * @param charset the charset
     * @return the escaped string
     * 
     * @throws URIException if the charset is not supported
     * 
     * @see #encode
     */
    public static String encodeWithinPath(String unescaped, String charset)
        throws URIException {

        return encode(unescaped, URI.allowed_within_path, charset);
    }


    
Escape and encode a string regarded as the path component of an URI with
the default protocol charset.

Params:
  • unescaped – an unescaped string
Throws:
  • URIException – if the default protocol charset is not supported
See Also:
Returns:the escaped string
/**
     * Escape and encode a string regarded as the path component of an URI with
     * the default protocol charset.
     *
     * @param unescaped an unescaped string
     * @return the escaped string
     * 
     * @throws URIException if the default protocol charset is not supported
     * 
     * @see URI#getDefaultProtocolCharset
     * @see #encode
     */
    public static String encodePath(String unescaped) throws URIException {
        return encodePath(unescaped, URI.getDefaultProtocolCharset());
    }


    
Escape and encode a string regarded as the path component of an URI with
a given charset.

Params:
  • unescaped – an unescaped string
  • charset – the charset
Throws:
See Also:
Returns:the escaped string
/**
     * Escape and encode a string regarded as the path component of an URI with
     * a given charset.
     *
     * @param unescaped an unescaped string
     * @param charset the charset
     * @return the escaped string
     * 
     * @throws URIException if the charset is not supported
     * 
     * @see #encode
     */
    public static String encodePath(String unescaped, String charset)
        throws URIException {

        return encode(unescaped, URI.allowed_abs_path, charset);
    }


    
Escape and encode a string regarded as within the query component of an
URI with the default protocol charset.
When a query comprise the name and value pairs, it is used in order
to encode each name and value string.  The reserved special characters
within a query component are being included in encoding the query.

Params:
  • unescaped – an unescaped string
Throws:
  • URIException – if the default protocol charset is not supported
See Also:
Returns:the escaped string
/**
     * Escape and encode a string regarded as within the query component of an
     * URI with the default protocol charset.
     * When a query comprise the name and value pairs, it is used in order
     * to encode each name and value string.  The reserved special characters
     * within a query component are being included in encoding the query.
     *
     * @param unescaped an unescaped string
     * @return the escaped string
     * 
     * @throws URIException if the default protocol charset is not supported
     * 
     * @see URI#getDefaultProtocolCharset
     * @see #encode
     */
    public static String encodeWithinQuery(String unescaped)
        throws URIException {

        return encodeWithinQuery(unescaped, URI.getDefaultProtocolCharset());
    }


    
Escape and encode a string regarded as within the query component of an
URI with a given charset.
When a query comprise the name and value pairs, it is used in order
to encode each name and value string.  The reserved special characters
within a query component are being included in encoding the query.

Params:
  • unescaped – an unescaped string
  • charset – the charset
Throws:
See Also:
Returns:the escaped string
/**
     * Escape and encode a string regarded as within the query component of an
     * URI with a given charset.
     * When a query comprise the name and value pairs, it is used in order
     * to encode each name and value string.  The reserved special characters
     * within a query component are being included in encoding the query.
     *
     * @param unescaped an unescaped string
     * @param charset the charset
     * @return the escaped string
     * 
     * @throws URIException if the charset is not supported
     * 
     * @see #encode
     */
    public static String encodeWithinQuery(String unescaped, String charset)
        throws URIException {

        return encode(unescaped, URI.allowed_within_query, charset);
    }


    
Escape and encode a string regarded as the query component of an URI with
the default protocol charset.
When a query string is not misunderstood the reserved special characters
("&", "=", "+", ",", and "$") within a query component, this method
is recommended to use in encoding the whole query.

Params:
  • unescaped – an unescaped string
Throws:
  • URIException – if the default protocol charset is not supported
See Also:
Returns:the escaped string
/**
     * Escape and encode a string regarded as the query component of an URI with
     * the default protocol charset.
     * When a query string is not misunderstood the reserved special characters
     * ("&amp;", "=", "+", ",", and "$") within a query component, this method
     * is recommended to use in encoding the whole query.
     *
     * @param unescaped an unescaped string
     * @return the escaped string
     * 
     * @throws URIException if the default protocol charset is not supported
     * 
     * @see URI#getDefaultProtocolCharset
     * @see #encode
     */
    public static String encodeQuery(String unescaped) throws URIException {
        return encodeQuery(unescaped, URI.getDefaultProtocolCharset());
    }


    
Escape and encode a string regarded as the query component of an URI with
a given charset.
When a query string is not misunderstood the reserved special characters
("&", "=", "+", ",", and "$") within a query component, this method
is recommended to use in encoding the whole query.

Params:
  • unescaped – an unescaped string
  • charset – the charset
Throws:
See Also:
Returns:the escaped string
/**
     * Escape and encode a string regarded as the query component of an URI with
     * a given charset.
     * When a query string is not misunderstood the reserved special characters
     * ("&amp;", "=", "+", ",", and "$") within a query component, this method
     * is recommended to use in encoding the whole query.
     *
     * @param unescaped an unescaped string
     * @param charset the charset
     * @return the escaped string
     * 
     * @throws URIException if the charset is not supported
     * 
     * @see #encode
     */
    public static String encodeQuery(String unescaped, String charset)
        throws URIException {

        return encode(unescaped, URI.allowed_query, charset);
    }


    
Escape and encode a given string with allowed characters not to be
escaped and the default protocol charset.

Params:
  • unescaped – a string
  • allowed – allowed characters not to be escaped
Throws:
  • URIException – if the default protocol charset is not supported
See Also:
Returns:the escaped string
/**
     * Escape and encode a given string with allowed characters not to be
     * escaped and the default protocol charset.
     *
     * @param unescaped a string
     * @param allowed allowed characters not to be escaped
     * @return the escaped string
     * 
     * @throws URIException if the default protocol charset is not supported
     * 
     * @see URI#getDefaultProtocolCharset
     */
    public static String encode(String unescaped, BitSet allowed)
        throws URIException {

        return encode(unescaped, allowed, URI.getDefaultProtocolCharset());
    }


    
Escape and encode a given string with allowed characters not to be
escaped and a given charset.

Params:
  • unescaped – a string
  • allowed – allowed characters not to be escaped
  • charset – the charset
Returns:the escaped string
/**
     * Escape and encode a given string with allowed characters not to be
     * escaped and a given charset.
     *
     * @param unescaped a string
     * @param allowed allowed characters not to be escaped
     * @param charset the charset
     * @return the escaped string
     */
    public static String encode(String unescaped, BitSet allowed,
            String charset) throws URIException {
        byte[] rawdata = URLCodec.encodeUrl(allowed, 
            EncodingUtil.getBytes(unescaped, charset));
        return EncodingUtil.getAsciiString(rawdata);
    }


    
Unescape and decode a given string regarded as an escaped string with the
default protocol charset.

Params:
  • escaped – a string
Throws:
See Also:
Returns:the unescaped string
/**
     * Unescape and decode a given string regarded as an escaped string with the
     * default protocol charset.
     *
     * @param escaped a string
     * @return the unescaped string
     * 
     * @throws URIException if the string cannot be decoded (invalid)
     * 
     * @see URI#getDefaultProtocolCharset
     */
    public static String decode(String escaped) throws URIException {
        try {
            byte[] rawdata = URLCodec.decodeUrl(EncodingUtil.getAsciiBytes(escaped));
            return EncodingUtil.getString(rawdata, URI.getDefaultProtocolCharset());
        } catch (DecoderException e) {
            throw new URIException(e.getMessage());
        }
    }

    
Unescape and decode a given string regarded as an escaped string.

Params:
  • escaped – a string
  • charset – the charset
Throws:
See Also:
Returns:the unescaped string
/**
     * Unescape and decode a given string regarded as an escaped string.
     *
     * @param escaped a string
     * @param charset the charset
     * @return the unescaped string
     * 
     * @throws URIException if the charset is not supported
     * 
     * @see Coder#decode
     */
    public static String decode(String escaped, String charset)
        throws URIException {

        return Coder.decode(escaped.toCharArray(), charset);
    }

    // ---------------------------------------------------------- Inner classes

    
The basic and internal utility for URI escape and character encoding and
decoding.

Deprecated:use org.apache.commons.codec.net.URLCodec
/**
     * The basic and internal utility for URI escape and character encoding and
     * decoding.
     * 
     * @deprecated use org.apache.commons.codec.net.URLCodec
     */
    protected static class Coder extends URI {

        
Escape and encode a given string with allowed characters not to be
escaped.

Params:
  • unescapedComponent – an unescaped component
  • allowed – allowed characters not to be escaped
  • charset – the charset to encode
Throws:
Returns:the escaped and encoded string
Deprecated:use org.apache.commons.codec.net.URLCodec
/**
         * Escape and encode a given string with allowed characters not to be
         * escaped.
         *
         * @param unescapedComponent an unescaped component
         * @param allowed allowed characters not to be escaped
         * @param charset the charset to encode
         * @return the escaped and encoded string
         * 
         * @throws URIException if the charset is not supported
         * 
         * @deprecated use org.apache.commons.codec.net.URLCodec
         */
        public static char[] encode(String unescapedComponent, BitSet allowed, String charset) 
            throws URIException {

            return URI.encode(unescapedComponent, allowed, charset);
        }


        
Unescape and decode a given string.

Params:
  • escapedComponent – an being-unescaped component
  • charset – the charset to decode
Throws:
Returns:the escaped and encoded string
Deprecated:use org.apache.commons.codec.net.URLCodec
/**
         * Unescape and decode a given string.
         *
         * @param escapedComponent an being-unescaped component
         * @param charset the charset to decode
         * @return the escaped and encoded string
         * 
         * @throws URIException if the charset is not supported
         * 
         * @deprecated use org.apache.commons.codec.net.URLCodec
         */
        public static String decode(char[] escapedComponent, String charset)
            throws URIException {

            return URI.decode(escapedComponent, charset);
        }


        
Verify whether a given string is escaped or not

Params:
  • original – given characters
Returns:true if the given character array is 7 bit ASCII-compatible.
/**
         * Verify whether a given string is escaped or not
         *
         * @param original given characters
         * @return true if the given character array is 7 bit ASCII-compatible.
         */
        public static boolean verifyEscaped(char[] original) {
            for (int i = 0; i < original.length; i++) {
                int c = original[i];
                if (c > 128) {
                    return false;
                } else if (c == '%') {
                    if (Character.digit(original[++i], 16) == -1 
                        || Character.digit(original[++i], 16) == -1) {
                        return false;
                    }
                }
            }
            return true;
        }


        
Replace from a given character to given character in an array order
for a given string.

Params:
  • original – a given string
  • from – a replacing character array
  • to – a replaced character array
Returns:the replaced string
/**
         * Replace from a given character to given character in an array order
         * for a given string.
         *
         * @param original a given string
         * @param from a replacing character array
         * @param to a replaced character array
         * @return the replaced string
         */
        public static String replace(String original, char[] from, char[] to) {
            for (int i = from.length; i > 0; --i) {
                original = replace(original, from[i], to[i]);
            }
            return original;
        }


        
Replace from a given character to given character for a given string.

Params:
  • original – a given string
  • from – a replacing character array
  • to – a replaced character array
Returns:the replaced string
/**
         * Replace from a given character to given character for a given string.
         *
         * @param original a given string
         * @param from a replacing character array
         * @param to a replaced character array
         * @return the replaced string
         */
        public static String replace(String original, char from, char to) {
            StringBuffer result = new StringBuffer(original.length());
            int at, saved = 0;
            do {
                at = original.indexOf(from);
                if (at >= 0) {
                    result.append(original.substring(0, at));
                    result.append(to);
                } else {
                    result.append(original.substring(saved));
                }
                saved = at;
            } while (at >= 0);
            return result.toString();
        }
    }

}