Java HTML Encode htmlEncode(final String source, StringBuffer target)

Description

Html encode, with StringBuffer as target (faster)

License

Open Source License

Parameter

Parameter	Description
source	a parameter
target	a parameter

Declaration

public static void htmlEncode(final String source, StringBuffer target) 

Method Source Code

//package com.java2s;
/*//from   ww  w  .j a va2  s.co m
 * Utility.java
 *
 * HomePage :  http://www.codeproject.com/csharp/TraceTool.asp
 * Download :  http://sourceforge.net/projects/tracetool/
 * See License.txt for license information
 *
 * Author : Thierry Parent
 * Version : 12.3
 *
 * Provide some utility functions
 */

public class Main {
    /**
     * Html encode, with StringBuffer as target (faster)
      * @param source
      * @param target
     */
    public static void htmlEncode(final String source, StringBuffer target) {
        if (source == null || source.length() == 0)
            return;

        int length = source.length();

        char[] charArray = new char[length];
        source.getChars(0, length, charArray, 0);

        int startIndex = 0;
        int currentIndex = 0;
        while (currentIndex < length) {

            char ch = charArray[currentIndex];
            int oneInt = ch;
            switch (ch) {
            case '<':
                if (startIndex < currentIndex)
                    target.append(charArray, startIndex, currentIndex - startIndex);
                target.append("&lt;"); //$NON-NLS-1$
                startIndex = currentIndex + 1;
                break;

            case '>':
                if (startIndex < currentIndex)
                    target.append(charArray, startIndex, currentIndex - startIndex);
                target.append("&gt;"); //$NON-NLS-1$
                startIndex = currentIndex + 1;
                break;

            case '"':
                if (startIndex < currentIndex)
                    target.append(charArray, startIndex, currentIndex - startIndex);
                target.append("&quot;"); //$NON-NLS-1$
                startIndex = currentIndex + 1;
                break;

            case '&':
                if (startIndex < currentIndex)
                    target.append(charArray, startIndex, currentIndex - startIndex);
                target.append("&amp;"); //$NON-NLS-1$
                startIndex = currentIndex + 1;
                break;

            default:
                if (oneInt > 65533) // char > 65533 cannot be converted to &#nnn; Use a formal text ?nnnn 
                    target.append("?").append(intToString(ch)); //$NON-NLS-1$
                else if ((ch < ' ') || ((oneInt >= 160))) // 0 to 31 and 160 to 256   // && (ch < 'A')
                {
                    if (startIndex < currentIndex)
                        target.append(charArray, startIndex, currentIndex - startIndex);
                    target.append("&#"); //$NON-NLS-1$
                    target.append(intToString(ch));
                    target.append(';');
                    startIndex = currentIndex + 1;
                } // else no encoding
                break;
            } // switch
            currentIndex++;
        }
        target.append(charArray, startIndex, length - startIndex);
    }

    /**
     * convert an integer to a string.
     * @param param An integer to convert
     * @return a string representation
     * @see #intToString(int, int) for formatted string
     */
    public static String intToString(final int param) {
        return Integer.toString(param);
    }

    /**
     * convert an integer to a string (left padding).
     * @param param  An integer to convert
     * @param len The string length
     * @return a string representation
     */
    public static String intToString(final int param, final int len) {
        return intToStringBuffer(param, len).toString();
    }

    /**
     * convert an integer to a StringBuffer (left padding).
     * @param param  An integer to convert
     * @param len The string length
     * @return a string representation
     */
    public static StringBuffer intToStringBuffer(final int param, final int len) {
        StringBuffer temp = new StringBuffer(Integer.toString(param));
        leftPadding(temp, len, ' ');
        return temp;
    }

    /**
     * Left Pad Stringbuffer with special char
     * @param strBuf Target buffer
     * @param bufLen Buffer length
     * @param fill Char to fill
     * @return a padded StringBuffer
     */
    public static StringBuffer leftPadding(final StringBuffer strBuf, final int bufLen, final char fill) {
        while (strBuf.length() < bufLen)
            strBuf.insert(0, fill);
        return strBuf;
    }
}

Related

1. forHTMLTag(String aTagFragment)
2. html(String text)
3. html(String text)
4. html_encode(String input_string)
5. HTMLBREncode(String str)
6. htmlEncode(Object input)
7. htmlEncode(String html)
8. htmlEncode(String html)
9. htmlEncode(String input)