写在前面
网上找了很多转emoji等方法,大多有两种方法
- 更改数据库编码格式为utf8mb4
- 过滤字符串中的emoji
都不是很优雅
- 更改数据库编码,势必影响其他数据库
- 过滤emoj效率比较低
处理Emoji方式
这里推荐使用org.apache.commons.lang3.StringEscapeUtils工具类,简单等两行代码实现特殊符号和emoji表情的转义存储,和读取反转;
转义存储
- StringEscapeUtils.escapeXXX(content)
它有几种转码方式,可以根据个人格式进行选择:
- public static final String escapeCsv(final String input);
- public static final String escapeEcmaScript(final String input);
- public static final String escapeHtml3(final String input);
- public static final String escapeHtml4(final String input);
- public static final String escapeJava(final String input);
- public static final String escapeJson(final String input);
- public static final String escapeXml(final String input);
- public static String escapeXml10(final String input);
- public static String escapeXml11(final String input)
读取反转义
读取后,根据个人格式进行反转义,即可还原emoji值,供前端展示;
- public static final String unescapeCsv(final String input) ;
- public static final String unescapeEcmaScript(final String input);
- public static final String unescapeHtml3(final String input);
- public static final String unescapeHtml4(final String input);
- public static final String unescapeJava(final String input);
- public static final String unescapeJson(final String input);
- public static final String unescapeXml(final String input);
附加一段手打的复杂代码:
package utils; 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; public class EmojiUtils {
/**
* emoji表情替换
*
* @param source 原字符串
*
* @param slipStr emoji表情替换成的字符串
*
* @return 过滤后的字符串
*/
public static String filterEmoji(String source, String slipStr) {
if (StringUtils.isNotBlank(source)) {
return source.replaceAll("[\\ud800\\udc00-\\udbff\\udfff\\ud800-\\udfff]", slipStr);
} else {
return source;
}
} /**
* @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 emojiConvert(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) {
throw e;
}
}
matcher.appendTail(sb);
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
* 转换后的字符串
* @return 转换前的字符串
* @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) {
throw e;
}
}
matcher.appendTail(sb);
return sb.toString();
}
}