基于Java编写emoji表情处理工具类
作者:大哈在此...
这篇文章主要为大家详细介绍了如何基于Java编写一个emoji表情处理工具类,文中的示例代码讲解详细,感兴趣的小伙伴可以跟随小编一起学习一下
emoji表情也是使用Unicode编码的,但UTF8编码是不支持的。我们如果想存储emoji到数据库,一般有两种方法,以mysql为例,将数据库编码从 utf8 改为 utf8mb4,第二种就是做一个转换,将emoji表情转换成另一个字符,所以本文主要来和大家讲讲如何使用Java实现处理emoji表情吧
xml
<!-- https://mvnrepository.com/artifact/com.vdurmont/emoji-java --> <dependency> <groupId>com.vdurmont</groupId> <artifactId>emoji-java</artifactId> <version>5.1.1</version> </dependency>
java代码
import java.io.UnsupportedEncodingException; import java.net.URLDecoder; import java.net.URLEncoder; import java.util.regex.Matcher; import java.util.regex.Pattern; import org.apache.commons.lang.StringUtils; import com.vdurmont.emoji.EmojiParser; /** * emoji表情过滤 * @author madaha * */ public class EmojiFilter { /** * 判断是否存在Emoji * @author madaha * * @param codePoint * @return */ 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 * @author madaha * * @param source 待过滤字符串 * @return */ public static String filterEmoji(String source) { if (StringUtils.isBlank(source)) { return source; } 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; } else { if (buf.length() == len) { buf = null; return source; } else { return buf.toString(); } } } /** * @Description 将字符串中的emoji表情转换成可以在utf-8字符集数据库中保存的格式(表情占4个字节,需要utf8mb4字符集) * @param str 待转换字符串 * @return 转换后字符串 * @throws UnsupportedEncodingException * exception */ public static String emojiConvert1(String str) throws UnsupportedEncodingException { String patternString = "([\\x{10000}-\\x{10ffff}\ud800-\udfff])"; Pattern pattern = Pattern.compile(patternString); Matcher matcher = pattern.matcher(str); StringBuffer sb = new StringBuffer(); while (matcher.find()) { try { matcher.appendReplacement(sb, "[[" + URLEncoder.encode(matcher.group(1), "UTF-8") + "]]"); } catch (UnsupportedEncodingException e) { System.out.println(e); throw e; } } matcher.appendTail(sb); // System.out.println("emojiConvert " + str + " to " + sb.toString() + ", len:" + sb.length()); return sb.toString(); } /** * @Description 还原utf8数据库中保存的含转换后emoji表情的字符串 * @param str 转换前的字符串 * @return 转换后的字符串 * @throws UnsupportedEncodingException * exception */ public static String emojiRecovery2(String str) throws UnsupportedEncodingException { String patternString = "\\[\\[(.*?)\\]\\]"; Pattern pattern = Pattern.compile(patternString); Matcher matcher = pattern.matcher(str); StringBuffer sb = new StringBuffer(); while (matcher.find()) { try { matcher.appendReplacement(sb, URLDecoder.decode(matcher.group(1), "UTF-8")); } catch (UnsupportedEncodingException e) { System.out.println(e); throw e; } } matcher.appendTail(sb); // System.out.println("emojiRecovery " + str + " to " + sb.toString()); return sb.toString(); } /** * emoji表情处理测试方法 * @author madaha * * @param args */ public static void main(String[] args) { String str = "emoji表情😁😁输入测试😁😂"; System.out.println("原始字符为:\n" + str); System.out.println("to aliases 之后:\n" + EmojiParser.parseToAliases(str)); str = EmojiParser.parseToAliases(str); System.out.println("还原:\n" + EmojiParser.parseToUnicode(str)); } }
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