Java HTML Encode textToHTML(String message)

Description

Scans a text, generating HTML that respects leading/consecutive spaces and newlines, while escaping actual HTML constructs.

License

Open Source License

Declaration

public static String textToHTML(String message) 

Method Source Code

//package com.java2s;
//License from project: Open Source License 

public class Main {
    /**/*  w w w .  j a v  a  2  s  .  c  o m*/
     * Scans a text, generating HTML that respects leading/consecutive spaces and newlines, while
     * escaping actual HTML constructs.
     */
    public static String textToHTML(String message) {
        StringBuffer html = new StringBuffer();
        boolean collectSpaces = true;
        for (int i = 0; i < message.length(); i++) {
            String bit;
            char c = message.charAt(i);
            switch (c) {
            case '\r':
                // completely ignore
                continue;
            case '<':
                // escape HTML
                bit = "&lt;";
                collectSpaces = false;
                break;
            case '>':
                // escape HTML
                bit = "&gt;";
                collectSpaces = false;
                break;
            case '&':
                // escape HTML
                bit = "&amp;";
                collectSpaces = false;
                break;
            case '\n':
                // a newline is replaced by a HTML break
                bit = "<br>\n";
                collectSpaces = true;
                break;
            case ' ':
            case '\t':
                // a single space is left alone, unless it leads a line
                if (!collectSpaces) {
                    collectSpaces = true;
                    bit = null;
                    break;
                }
                // but a leading space or consecutive spaces are replaced by these
                bit = "&nbsp;";
                break;
            default:
                collectSpaces = false;
                bit = null;
                break;
            }
            if (bit != null) {
                html.append(bit);
            } else {
                html.append(c);
            }
        }
        return html.toString();
    }
}

Related

1. htmlspecialchars(String input)
2. htmlspecialchars(String s)
3. htmlspecialchars(String str)
4. textToHtml(final String s)
5. textToHtml(String html)
6. textToHtml(String s)
7. textToHTML(String text)
8. textToHtml(String text)
9. textToHtml(String text)