最近工作时，测试再框里面添加了表情包，导致数据包添加信息报错。

有时候,保存文本时会输入一些表情符号，这些符号分为两种，一是由常见字符拼接成的，比如(^▽^)，o(╥﹏╥)o，还有一种就是直接的表情，比如?。

两者传递到后端都能正确显示出来，如下：

但是在保存入库时，后者就会导致数据库操作发生错误：

Error updating database. Cause: java.sql.SQLException: Incorrect string value: ‘\xF0\x9F\x91\x87’ for column ‘content’ at row 1
The error may involve com.eknown.model.dao.mybatis.CommentDAO.save-Inline The error occurred while setting parameters SQL: INSERT INTO comment ( title, content, intervals, createTime, startTime, createUserId, eventsId ) VALUES ( ?, ?, ?, ?, ?, ?, ? ) Cause: java.sql.SQLException: Incorrect string value: ‘\xF0\x9F\x91\x87’ for column ‘content’ at row 1 ; uncategorized SQLException; SQL state [HY000]; error code [1366]; Incorrect string value: ‘\xF0\x9F\x91\x87’ for column ‘content’ at row 1; nested exception is java.sql.SQLException: Incorrect string value: ‘\xF0\x9F\x91\x87’ for column ‘content’ at row 1] with root cause

为什么呢？

根据上面的报错可以看出，是?这个符号在转码后，与SQL语句发生了冲突。

所以，我们需要对文本中的这类表情符号进行过滤。

下面的代码通过对String中的每一个字符进行遍历，判定是否是正常字符，如果是，则添加到结果集中：

 /*** 过滤评论中所包含的表情符号* @param str* @return*/public static String emojiFilter(String str) {try {Pattern pattern = Pattern.compile(unicodeReg);StringBuilder reBuffer = new StringBuilder();for (int i = 0; i < str.length(); i++) {char c = str.charAt(i);String temp = String.valueOf(c);Matcher matcher = pattern.matcher(temp);if (matcher.find()) {reBuffer.append(temp);}}return reBuffer.toString();} catch (Exception e) {e.printStackTrace();return str; // 转换出错就放弃转换}}public final static String unicodeReg= "["+"\u4E00-\u9FBF"+//：CJK 统一表意符号 (CJK Unified Ideographs)"\u4DC0-\u4DFF"+//：易经六十四卦符号 (Yijing Hexagrams Symbols)"\u0000-\u007F"+//：C0控制符及基本拉丁文 (C0 Control and Basic Latin)"\u0080-\u00FF"+//：C1控制符及拉丁：补充-1 (C1 Control and Latin 1 Supplement)"\u0100-\u017F"+//：拉丁文扩展-A (Latin Extended-A)"\u0180-\u024F"+//：拉丁文扩展-B (Latin Extended-B)"\u0250-\u02AF"+//：国际音标扩展 (IPA Extensions)"\u02B0-\u02FF"+//：空白修饰字母 (Spacing Modifiers)"\u0300-\u036F"+//：结合用读音符号 (Combining Diacritics Marks)"\u0370-\u03FF"+//：希腊文及科普特文 (Greek and Coptic)"\u0400-\u04FF"+//：西里尔字母 (Cyrillic)"\u0500-\u052F"+//：西里尔字母补充 (Cyrillic Supplement)"\u0530-\u058F"+//：亚美尼亚语 (Armenian)"\u0590-\u05FF"+//：希伯来文 (Hebrew)"\u0600-\u06FF"+//：阿拉伯文 (Arabic)"\u0700-\u074F"+//：叙利亚文 (Syriac)"\u0750-\u077F"+//：阿拉伯文补充 (Arabic Supplement)"\u0780-\u07BF"+//：马尔代夫语 (Thaana)//"\u07C0-\u077F"+//：西非书面语言 (N'Ko)"\u0800-\u085F"+//：阿维斯塔语及巴列维语 (Avestan and Pahlavi)"\u0860-\u087F"+//：Mandaic"\u0880-\u08AF"+//：撒马利亚语 (Samaritan)"\u0900-\u097F"+//：天城文书 (Devanagari)"\u0980-\u09FF"+//：孟加拉语 (Bengali)"\u0A00-\u0A7F"+//：锡克教文 (Gurmukhi)"\u0A80-\u0AFF"+//：古吉拉特文 (Gujarati)"\u0B00-\u0B7F"+//：奥里亚文 (Oriya)"\u0B80-\u0BFF"+//：泰米尔文 (Tamil)"\u0C00-\u0C7F"+//：泰卢固文 (Telugu)"\u0C80-\u0CFF"+//：卡纳达文 (Kannada)"\u0D00-\u0D7F"+//：德拉维族语 (Malayalam)"\u0D80-\u0DFF"+//：僧伽罗语 (Sinhala)"\u0E00-\u0E7F"+//：泰文 (Thai)"\u0E80-\u0EFF"+//：老挝文 (Lao)"\u0F00-\u0FFF"+//：藏文 (Tibetan)"\u1000-\u109F"+//：缅甸语 (Myanmar)"\u10A0-\u10FF"+//：格鲁吉亚语 (Georgian)"\u1100-\u11FF"+//：朝鲜文 (Hangul Jamo)"\u1200-\u137F"+//：埃塞俄比亚语 (Ethiopic)"\u1380-\u139F"+//：埃塞俄比亚语补充 (Ethiopic Supplement)"\u13A0-\u13FF"+//：切罗基语 (Cherokee)"\u1400-\u167F"+//：统一加拿大土著语音节 (Unified Canadian Aboriginal Syllabics)"\u1680-\u169F"+//：欧甘字母 (Ogham)"\u16A0-\u16FF"+//：如尼文 (Runic)"\u1700-\u171F"+//：塔加拉语 (Tagalog)"\u1720-\u173F"+//：Hanunóo"\u1740-\u175F"+//：Buhid"\u1760-\u177F"+//：Tagbanwa"\u1780-\u17FF"+//：高棉语 (Khmer)"\u1800-\u18AF"+//：蒙古文 (Mongolian)"\u18B0-\u18FF"+//：Cham"\u1900-\u194F"+//：Limbu"\u1950-\u197F"+//：德宏泰语 (Tai Le)"\u1980-\u19DF"+//：新傣仂语 (New Tai Lue)"\u19E0-\u19FF"+//：高棉语记号 (Kmer Symbols)"\u1A00-\u1A1F"+//：Buginese"\u1A20-\u1A5F"+//：Batak"\u1A80-\u1AEF"+//：Lanna"\u1B00-\u1B7F"+//：巴厘语 (Balinese)"\u1B80-\u1BB0"+//：巽他语 (Sundanese)"\u1BC0-\u1BFF"+//：Pahawh Hmong"\u1C00-\u1C4F"+//：雷布查语(Lepcha)"\u1C50-\u1C7F"+//：Ol Chiki"\u1C80-\u1CDF"+//：曼尼普尔语 (Meithei/Manipuri)"\u1D00-\u1D7F"+//：语音学扩展 (Phone tic Extensions)"\u1D80-\u1DBF"+//：语音学扩展补充 (Phonetic Extensions Supplement)"\u1DC0-\u1DFF"+//结合用读音符号补充 (Combining Diacritics Marks Supplement)"\u1E00-\u1EFF"+//：拉丁文扩充附加 (Latin Extended Additional)"\u1F00-\u1FFF"+//：希腊语扩充 (Greek Extended)"\u2000-\u206F"+//：常用标点 (General Punctuation)"\u2070-\u209F"+//：上标及下标 (Superscripts and Subscripts)"\u20A0-\u20CF"+//：货币符号 (Currency Symbols)"\u20D0-\u20FF"+//：组合用记号 (Combining Diacritics Marks for Symbols)"\u2100-\u214F"+//：字母式符号 (Letterlike Symbols)"\u2150-\u218F"+//：数字形式 (Number Form)"\u2190-\u21FF"+//：箭头 (Arrows)"\u2200-\u22FF"+//：数学运算符 (Mathematical Operator)"\u2300-\u23FF"+//：杂项工业符号 (Miscellaneous Technical)"\u2400-\u243F"+//：控制图片 (Control Pictures)"\u2440-\u245F"+//：光学识别符 (Optical Character Recognition)"\u2460-\u24FF"+//：封闭式字母数字 (Enclosed Alphanumerics)"\u2500-\u257F"+//：制表符 (Box Drawing)"\u2580-\u259F"+//：方块元素 (Block Element)"\u25A0-\u25FF"+//：几何图形 (Geometric Shapes)"\u2600-\u26FF"+//：杂项符号 (Miscellaneous Symbols)"\u2700-\u27BF"+//：印刷符号 (Dingbats)"\u27C0-\u27EF"+//：杂项数学符号-A (Miscellaneous Mathematical Symbols-A)"\u27F0-\u27FF"+//：追加箭头-A (Supplemental Arrows-A)"\u2800-\u28FF"+//：盲文点字模型 (Braille Patterns)"\u2900-\u297F"+//：追加箭头-B (Supplemental Arrows-B)"\u2980-\u29FF"+//：杂项数学符号-B (Miscellaneous Mathematical Symbols-B)"\u2A00-\u2AFF"+//：追加数学运算符 (Supplemental Mathematical Operator)"\u2B00-\u2BFF"+//：杂项符号和箭头 (Miscellaneous Symbols and Arrows)"\u2C00-\u2C5F"+//：格拉哥里字母 (Glagolitic)"\u2C60-\u2C7F"+//：拉丁文扩展-C (Latin Extended-C)"\u2C80-\u2CFF"+//：古埃及语 (Coptic)"\u2D00-\u2D2F"+//：格鲁吉亚语补充 (Georgian Supplement)"\u2D30-\u2D7F"+//：提非纳文 (Tifinagh)"\u2D80-\u2DDF"+//：埃塞俄比亚语扩展 (Ethiopic Extended)"\u2E00-\u2E7F"+//：追加标点 (Supplemental Punctuation)"\u2E80-\u2EFF"+//：CJK 部首补充 (CJK Radicals Supplement)"\u2F00-\u2FDF"+//：康熙字典部首 (Kangxi Radicals)"\u2FF0-\u2FFF"+//：表意文字描述符 (Ideographic Description Characters)"\u3000-\u303F"+//：CJK 符号和标点 (CJK Symbols and Punctuation)"\u3040-\u309F"+//：日文平假名 (Hiragana)"\u30A0-\u30FF"+//：日文片假名 (Katakana)"\u3100-\u312F"+//：注音字母 (Bopomofo)"\u3130-\u318F"+//：朝鲜文兼容字母 (Hangul Compatibility Jamo)"\u3190-\u319F"+//：象形字注释标志 (Kanbun)"\u31A0-\u31BF"+//：注音字母扩展 (Bopomofo Extended)"\u31C0-\u31EF"+//：CJK 笔画 (CJK Strokes)"\u31F0-\u31FF"+//：日文片假名语音扩展 (Katakana Phonetic Extensions)"\u3200-\u32FF"+//：封闭式 CJK 文字和月份 (Enclosed CJK Letters and Months)"\u3300-\u33FF"+//：CJK 兼容 (CJK Compatibility)"\u3400-\u4DBF"+//：CJK 统一表意符号扩展 A (CJK Unified Ideographs Extension A)"\u4DC0-\u4DFF"+//：易经六十四卦符号 (Yijing Hexagrams Symbols)"\u4E00-\u9FBF"+//：CJK 统一表意符号 (CJK Unified Ideographs)"\uA000-\uA48F"+//：彝文音节 (Yi Syllables)"\uA490-\uA4CF"+//：彝文字根 (Yi Radicals)"\uA500-\uA61F"+//：Vai"\uA660-\uA6FF"+//：统一加拿大土著语音节补充 (Unified Canadian Aboriginal Syllabics Supplement)"\uA700-\uA71F"+//：声调修饰字母 (Modifier Tone Letters)"\uA720-\uA7FF"+//：拉丁文扩展-D (Latin Extended-D)"\uA800-\uA82F"+//：Syloti Nagri"\uA840-\uA87F"+//：八思巴字 (Phags-pa)"\uA880-\uA8DF"+//：Saurashtra"\uA900-\uA97F"+//：爪哇语 (Javanese)"\uA980-\uA9DF"+//：Chakma"\uAA00-\uAA3F"+//：Varang Kshiti"\uAA40-\uAA6F"+//：Sorang Sompeng"\uAA80-\uAADF"+//：Newari"\uAB00-\uAB5F"+//：越南傣语 (Vi?t Thái)"\uAB80-\uABA0"+//：Kayah Li"\uAC00-\uD7AF"+//：朝鲜文音节 (Hangul Syllables)//"\uD800-\uDBFF"+//：High-half zone of UTF-16//"\uDC00-\uDFFF"+//：Low-half zone of UTF-16"\uE000-\uF8FF"+//：自行使用区域 (Private Use Zone)"\uF900-\uFAFF"+//：CJK 兼容象形文字 (CJK Compatibility Ideographs)"\uFB00-\uFB4F"+//：字母表达形式 (Alphabetic Presentation Form)"\uFB50-\uFDFF"+//：阿拉伯表达形式A (Arabic Presentation Form-A)"\uFE00-\uFE0F"+//：变量选择符 (Variation Selector)"\uFE10-\uFE1F"+//：竖排形式 (Vertical Forms)"\uFE20-\uFE2F"+//：组合用半符号 (Combining Half Marks)"\uFE30-\uFE4F"+//：CJK 兼容形式 (CJK Compatibility Forms)"\uFE50-\uFE6F"+//：小型变体形式 (Small Form Variants)"\uFE70-\uFEFF"+//：阿拉伯表达形式B (Arabic Presentation Form-B)"\uFF00-\uFFEF"+//：半型及全型形式 (Halfwidth and Fullwidth Form)"\uFFF0-\uFFFF]";//：特殊 (Specials);

validate注解在我们后端接收参数时，是非常好用的参数校验方法。

所以为了方便使用，也使用编写了这样一个注解。

@Documented
@Retention(RUNTIME)
@Target({FIELD})
@Constraint(validatedBy = NoEmoji.emojiFilter.class)
public @interface NoEmoji {boolean required() default false;String message() default "我们不接受表情包哦！";Class<?>[] groups() default {};Class<? extends Payload>[] payload() default {};public static class emojiFilter implements ConstraintValidator<NoEmoji, String> {private boolean required = false;@Overridepublic void initialize(NoEmoji noEmoji) {required = noEmoji.required();}private Pattern pattern = Pattern.compile(unicodeReg);@Overridepublic boolean isValid(String value, ConstraintValidatorContext context) {if (StringUtil.isNullOrEmpty(value)) {if (!required)return true;elsereturn false;}
//            return pattern.matcher(value).matches();try {StringBuilder reBuffer = new StringBuilder();for (int i = 0; i < value.length(); i++) {char c = value.charAt(i);String temp = String.valueOf(c);Matcher matcher = pattern.matcher(temp);if (!matcher.find()) {
//                        reBuffer.append(temp);return false;}}return true;} catch (Exception e) {e.printStackTrace();return false; // 转换出错就放弃转换}}
}