Given a string, replace all the instances of XML entities with their corresponding XML special characters. - Java XML

Java examples for XML:XML String

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Description

Given a string, replace all the instances of XML entities with their corresponding XML special characters.

Demo Code

//package com.java2s;

public class Main {
    public static void main(String[] argv) {
        String string = "java2s.com";
        System.out.println(unescapeForXML(string));
    }/*from   w w w  .  j a  v  a 2s  .c o  m*/

    /** Given a string, replace all the instances of XML entities
     *  with their corresponding XML special characters.  This is necessary to
     *  allow arbitrary strings to be encoded within XML.
     *
     *  <p>In this method, we make the following translations:
     *  <pre>
     *  &amp;amp; becomes &amp
     *  &amp;quot; becomes "
     *  &amp;lt; becomes <
     *  &amp;gt; becomes >
     *  &amp;#10; becomes newline
     *  &amp;#13; becomes carriage return
     *  </pre>
     *  @see #escapeForXML(String)
     *
     *  @param string The string to escape.
     *  @return A new string with special characters replaced.
     */
    public static String unescapeForXML(String string) {
        string = substitute(string, "&amp;", "&");
        string = substitute(string, "&quot;", "\"");
        string = substitute(string, "&lt;", "<");
        string = substitute(string, "&gt;", ">");
        string = substitute(string, "&#10;", "\n");
        string = substitute(string, "&#13;", "\r");
        return string;
    }

    /** Replace all occurrences of <i>pattern</i> in the specified
     *  string with <i>replacement</i>.  Note that the pattern is NOT
     *  a regular expression, and that relative to the
     *  String.replaceAll() method in jdk1.4, this method is extremely
     *  slow.  This method does not work well with back slashes.
     *  @param string The string to edit.
     *  @param pattern The string to replace.
     *  @param replacement The string to replace it with.
     *  @return A new string with the specified replacements.
     */
    public static String substitute(String string, String pattern,
            String replacement) {
        int start = string.indexOf(pattern);

        while (start != -1) {
            StringBuffer buffer = new StringBuffer(string);
            buffer.delete(start, start + pattern.length());
            buffer.insert(start, replacement);
            string = new String(buffer);
            start = string.indexOf(pattern, start + replacement.length());
        }

        return string;
    }
}

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