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java 用户名称中emoji表情包的模糊处理

杨昊
2023-12-01

1 maven引入emoji-java

<dependency>
  <groupId>com.vdurmont</groupId>
  <artifactId>emoji-java</artifactId>
  <version>5.1.1</version>
</dependency>

2 表情包工具类

import com.dianping.cat.Cat;
import com.google.common.collect.Sets;
import com.vdurmont.emoji.EmojiParser;
import org.apache.commons.lang3.StringUtils;

import java.util.Set;

/**
 * 表情包静态工具
 * Created by mazhen on 2022-02-22.
 */
@Slf4j
public class EmojiTool extends EmojiParser {

    public static Set<Integer> getEmojiEndPos(char[] text) {
        Set<Integer> set = Sets.newHashSet();
        for(int i = 0; i < text.length; ++i) {
            Integer emojiEnd = -1;
            try {
                emojiEnd = getEmojiEndPos(text, i);
            } catch (Exception e) {
               log.error("Emoji position exception",e);
            }
            if (emojiEnd >= 0) {
                set.add(emojiEnd);
            }
        }
        return set;
    }

    /**
     * 表情包出现的位置
     * @param str 包含表情包的字符串
     * @return
     */
    public static Set<Integer> getEmojiEndPos(String str) {
        if (StringUtils.isBlank(str)) {
            return Sets.newHashSet();
        }
        return getEmojiEndPos(str.toCharArray());
    }

    public static void main(String[] args) {
        String str = "这个杀手不太冷";
        Set<Integer> list =  getEmojiEndPos(str);
        System.out.println(list);
    }

}

3 emoji包情包的模糊处理工具类

import com.util.emoji.EmojiTool;
import org.apache.commons.collections4.CollectionUtils;
import org.apache.commons.lang3.StringUtils;

import java.util.*;

/**
 * 字符串静态工具
 * 
 * Created by mazhen on 2022-02-22.
 */
public class StringTool {
   //用户名称长度少于等于这个数字则不模糊 
   private int USERNAME_NOT_BLUR_NUM = 3;

    private StringTool() {
    }
    

     /**
     *
     * @param str 字符串
     * @param strLen 字符串长度
     * @param index 首端不模糊的位置
     * @param end 尾端不模糊的位置
     * @param removeIndex 尾端留下的字符数
     * @return
     */
    private static String around (String str, int strLen, int index, int end, int removeIndex) {
        String leftStr = StringUtils.left(str,index);
        String rightStr = StringUtils.right(str,end);
        String leftPadStr = StringUtils.leftPad(rightStr,strLen,"*");
        String removeStr = leftPadStr.length() <= removeIndex ? leftPadStr : leftPadStr.substring(strLen-removeIndex);
        String resultStr = leftStr.concat(removeStr);
        return resultStr;
    }


     public static String around (String str) {
        if (StringUtils.isBlank(str)) {
            return "";
        }
        int strLen = StringUtils.length(str);
        if (strLen <= USERNAME_NOT_BLUR_NUM) {
            return str;
        }
        //字符串头节点不模糊的字符数
        int index = 1;
        //字符串尾节点不模糊的字符数
        int end = 1;
        //字符串尾节点最终保留的字符数(两个*和一个普通字符)
        int removeIndex = 3;
        Set<Integer> emojiPosSet = EmojiTool.getEmojiEndPos(str);
        //存在表情包(一个表情包占两个字符)
        if (CollectionUtils.isNotEmpty(emojiPosSet)) {
            int first = 2;
            //第一个字符是表情包
            boolean head = emojiPosSet.contains(first);
            if (head) {
                //表情包占两个字符,所以字符串头节点不模糊的字节数为2
                index = 2;
            }
            //中间字符包含表情包
            boolean middle = false;
            for (int i = first+1;i<strLen;i++) {
                middle = emojiPosSet.contains(i);
                if (middle) {
                    break;
                }
            }
            //最后一个字符是表情包
            boolean tail = emojiPosSet.contains(strLen);
            if (tail) {
                //表情包占两个字符,所以字符串尾节点不模糊的字节数为2
                end = 2;
                //表情包占两个字符,字符串尾节点最终保留的字符数为4(两个*和一个表情包)
                removeIndex+=1;
            }
            // 表情包是普通字符数量的2倍
            int emojiNum = 2 * USERNAME_NOT_BLUR_NUM;
            //strLen == 4 则有两个表情包 或者 一个表情包和两个普通字符
            if (strLen == emojiNum - 2) {
                boolean fourBool = head || middle || tail;
                if (fourBool) {
                    return str;
                }
            }
            //strLen == 5 则有两个表情包和一个普通字符 有三种组合
            boolean fiveBool = (head && middle) || (head && tail) || (middle && tail);
            if ( (strLen == emojiNum - 1) && fiveBool) {
                return str;
            }
            //strLen == 6 则有三个表情包
            if ( (strLen == emojiNum) && (head && middle && tail)) {
                return str;
            }
        }
        return around(str,strLen,index,end,removeIndex);
    }

    public static void main(String[] args) {
        String str = "发看";
        String result = around(str);
        System.out.println(result);
    }
}

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