Emoji表情转义
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2022-04-21 10:17:43
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package com.jp.util;
import org.apache.commons.lang3.StringUtils;
/**
* Created by Administrator on 2019/1/24 0024.
*/
public class EmojiCharacterUtil {
// 转义时标识
private static final char unicode_separator = '&';
private static final char unicode_prefix = 'u';
private static final char separator = ':';
private static boolean isEmojiCharacter(int codePoint) {
return (codePoint >= 0x2600 && codePoint <= 0x27BF) // 杂项符号与符号字体
|| codePoint == 0x303D
|| codePoint == 0x2049
|| codePoint == 0x203C
|| (codePoint >= 0x2000 && codePoint <= 0x200F)//
|| (codePoint >= 0x2028 && codePoint <= 0x202F)//
|| codePoint == 0x205F //
|| (codePoint >= 0x2065 && codePoint <= 0x206F)//
/* 标点符号占用区域 */
|| (codePoint >= 0x2100 && codePoint <= 0x214F)// 字母符号
|| (codePoint >= 0x2300 && codePoint <= 0x23FF)// 各种技术符号
|| (codePoint >= 0x2B00 && codePoint <= 0x2BFF)// 箭头A
|| (codePoint >= 0x2900 && codePoint <= 0x297F)// 箭头B
|| (codePoint >= 0x3200 && codePoint <= 0x32FF)// 中文符号
|| (codePoint >= 0xD800 && codePoint <= 0xDFFF)// 高低位替代符保留区域
|| (codePoint >= 0xE000 && codePoint <= 0xF8FF)// 私有保留区域
|| (codePoint >= 0xFE00 && codePoint <= 0xFE0F)// 变异选择器
|| codePoint >= 0x10000; // Plane在第二平面以上的,char都不可以存,全部都转
}
/**
* 将带有emoji字符的字符串转换成可见字符标识
*/
public static String escape(String src) {
if (StringUtils.isBlank(src)) {
return src;
}
int cpCount = src.codePointCount(0, src.length());
int firCodeIndex = src.offsetByCodePoints(0, 0);
int lstCodeIndex = src.offsetByCodePoints(0, cpCount - 1);
StringBuilder sb = new StringBuilder(src.length());
for (int index = firCodeIndex; index <= lstCodeIndex; index ++) {
int codepoint = src.codePointAt(index);
if (isEmojiCharacter(codepoint)) {
String hash = Integer.toHexString(codepoint);
sb.append(unicode_separator).append(hash.length()).append(unicode_prefix).append(separator).append(hash);
// hash 长度,4位1个字节
index += (hash.length() - 1)/4;
} else {
sb.append((char) codepoint);
}
}
return sb.toString();
}
/** 解析可见字符标识字符串 */
public static String reverse(String src) {
// 查找对应编码的标识位
if (StringUtils.isBlank(src)) {
return src;
}
StringBuilder sb = new StringBuilder(src.length());
char[] sourceChar = src.toCharArray();
int index = 0;
while (index < sourceChar.length) {
if (sourceChar[index] == unicode_separator) {
if (index + 6 >= sourceChar.length) {
sb.append(sourceChar[index]);
index++;
continue;
}
// 自已的格式,与通用unicode格式不能互转
if (sourceChar[index + 1] >= '4' && sourceChar[index + 1] <= '6'
&& sourceChar[index + 2] == unicode_prefix
&& sourceChar[index + 3] == separator) {
int length = Integer.parseInt(String.valueOf(sourceChar[index + 1]));
char[] hexchars = new char[length]; // 创建一个4至六位的数组,来存储uncode码的HEX值
for (int j = 0; j < length; j++) {
char ch = sourceChar[index + 4 + j];// 4位识别码
if ((ch >= '0' && ch <= '9') || (ch >= 'a' && ch <= 'f')) {
hexchars[j] = ch;
} else { // 字符范围不对
sb.append(sourceChar[index]);
index++;
break;
}
}
sb.append(Character.toChars(Integer.parseInt(new String(hexchars), 16)));
index += (4 + length);// 4位前缀+4-6位字符码
} else if (sourceChar[index + 1] == unicode_prefix) { // 通用字符的反转
// 因为第二平面之上的,已经采用了我们自己转码格式,所以这里是固定的长度4
char[] hexchars = new char[4];
for (int j = 0; j < 4; j++) {
char ch = sourceChar[index + 2 + j]; // 两位识别码要去掉
if ((ch >= '0' && ch <= '9') || (ch >= 'a' && ch <= 'f')) {
hexchars[j] = ch; // 4位识别码
} else { // 字符范围不对
sb.append(sourceChar[index]);
index++;
break;
}
sb.append(Character.toChars(Integer.parseInt(String.valueOf(hexchars), 16)));
index += (2 + 4);// 2位前缀+4位字符码
}
} else {
sb.append(sourceChar[index]);
index++;
continue;
}
} else {
sb.append(sourceChar[index]);
index++;
continue;
}
}
return sb.toString();
}
public static String filter(String src) {
if (src == null) {
return null;
}
int cpCount = src.codePointCount(0, src.length());
int firCodeIndex = src.offsetByCodePoints(0, 0);
int lstCodeIndex = src.offsetByCodePoints(0, cpCount - 1);
StringBuilder sb = new StringBuilder(src.length());
for (int index = firCodeIndex; index <= lstCodeIndex;) {
int codepoint = src.codePointAt(index);
if (!isEmojiCharacter(codepoint)) {
System.err.println("codepoint:" + Integer.toHexString(codepoint));
sb.append((char) codepoint);
}
index += ((Character.isSupplementaryCodePoint(codepoint)) ? 2 : 1);
}
return sb.toString();
}
}
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