表情字符转译存储及读取

package com.springboot.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.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
 
public class EmojiUtils {
 
    
    /**
     * 存储
    * @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
    */
    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) {
		    	throw e;
		    }
	    }
	    matcher.appendTail(sb);
	    return sb.toString();
    }
 
    /**
     * 读取
    * @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
    */
    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();
    }
    
}