WmlUtils.java

package com.jrails.commons.utils;

/**
 * Created by arden
 * User: <a href="mailto:arden.emily@gmail.com">arden</a>
 * Date: 2009-4-10 14:38:37
 */
public class WmlUtils {
    /**
     * 使用d替代非法字符.
     * @param text
     * @param replacement
     * @return
     */
    public static String replaceInvaldateCharacter(String text, char replacement) {
        if (text != null) {
            char[] data = text.toCharArray();
            for (int i = 0; i < data.length; i++) {
                if(!isXMLCharacter(data[i]))
                    data[i] = replacement;
            }
            return new String(data);
        }
        return "";
    }

    /**
     * 使用空格替代非法字符.
     * @param text
     * @return
     */
    public static String replaceInvaldateCharacter(String text) {
        return replaceInvaldateCharacter(text, (char)0x20);
    }

    /**
     * 检查字符是否为合法的xml字符
     * XML规范中规定了允许的字符范围(http://www.w3.org/TR/REC-xml#dt-character):
     * Char ::= #x9 | #xA | #xD | [#x20-#xD7FF] | [#xE000-#xFFFD] | [#x10000-#x10FFFF]
     * @param c
     * @return
     */
    private static boolean isXMLCharacter(int c) {
        if (c <= 0xD7FF) {
            if (c >= 0x20)
                return true;
            else
                return c == '\n' ||  c == '\r' || c == '\t';
        }
        return (c>=0xE000 && c<= 0xFFFD) || (c>=0x10000 && c<= 0x10FFFF);
    }
}