项目总结31：Java字符串过滤特殊字符和表情符号

 

直接上源码

package com.hs.common.util.emojifilter;import org.apache.commons.lang3.StringUtils;public class EmojiFilter {    /**     * 检测是否有emoji字符     * @param source     * @return 一旦含有就抛出     */    public static boolean containsEmoji(String source) {        if (StringUtils.isBlank(source)) {            return false;        }        int len = source.length();        for (int i = 0; i < len; i++) {            char codePoint = source.charAt(i);            if (isEmojiCharacter(codePoint)) {                //do nothing，判断到了这里表明，确认有表情字符                return true;            }        }        return false;    }    private static boolean isEmojiCharacter(char codePoint) {        return (codePoint == 0x0) ||                (codePoint == 0x9) ||                (codePoint == 0xA) ||                (codePoint == 0xD) ||                ((codePoint >= 0x20) && (codePoint <= 0xD7FF)) ||                ((codePoint >= 0xE000) && (codePoint <= 0xFFFD)) ||                ((codePoint >= 0x10000) && (codePoint <= 0x10FFFF));    }/**     * 过滤emoji 或者 其他非文字类型的字符     * @param source     * @return     */    public static String filterEmoji(String source) {        if (!containsEmoji(source)) {            return source;//如果不包含，直接返回        }        //到这里铁定包含        StringBuilder buf = null;        int len = source.length();        for (int i = 0; i < len; i++) {            char codePoint = source.charAt(i);            if (isEmojiCharacter(codePoint)) {                if (buf == null) {                    buf = new StringBuilder(source.length());                }                buf.append(codePoint);            } else {            }        }        if (buf == null) {            return source;//如果没有找到 emoji表情，则返回源字符串        } else {            if (buf.length() == len) {
   //这里的意义在于尽可能少的toString，因为会重新生成字符串                buf = null;                return source;            } else {                return buf.toString();            }        }    }}