比如我们要把微信昵称存入数据库，就需要把表情给过滤掉。

package com.zjr.common.utils;

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);

}

}

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();

}

}

}

}

原文：http://blog.csdn.net/kollyqaq/article/details/51355923