Java之~ 存储表情图EmojiUtil工具类

一，导入表情jar包 emoji-java-4.0.0.jar

二，工具类

package com.javajy.util;

import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import org.apache.commons.lang.StringUtils;

import com.vdurmont.emoji.EmojiParser;

public class EmojiUtil extends EmojiParser {

   /**
   * 表情
   * @param str 内容
   * @return
   */
1. public static String onlyEmojiToUnicode(String str){
       if(str==null || "".equals(str))
           return "";
   StringBuffer sbf = new StringBuffer();
   for(int i = 0;i<str.length();i++){
       char c = str.charAt(i);
       if(!EmojiUtil.isEmojiCharacter(str.charAt(i)))//判断
           sbf.append(EmojiUtil.getUnicode(String.valueOf(c)));//将表情转换unicode
       else
           sbf.append(c);
   }
   System.out.println(sbf.toString());
//     System.out.println(EmojiUtil.getNonEmojiString(beforeStr));//获取非表情字符
//     String unicode = EmojiUtil.getUnicode(EmojiUtil.getEmojiUnicodeString(beforeStr));//获取表情字符

   return sbf.toString();
   }

2. public 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));
   }

   /**将表情字符串转成Unicode
   * @param source
   * @return
   */
3. public static String getUnicode(String source){
       String returnUniCode=null;
       String uniCodeTemp=null;
       for(int i=0;i<source.length();i++){
       uniCodeTemp = "\\u"+Integer.toHexString((int)source.charAt(i));
       returnUniCode=returnUniCode==null?uniCodeTemp:returnUniCode+uniCodeTemp;
       }
       return returnUniCode;
   }

   //字符串转换unicode
public static String stringToUnicode(String string) {
StringBuffer unicode = new StringBuffer();
for (int i = 0; i < string.length(); i++) {
char c = string.charAt(i); // 取出每一个字符
unicode.append("\\u" +Integer.toHexString(c));// 转换为unicode
}
return unicode.toString();
}
/**
* 把十六进制Unicode编码字符串转换为中文字符串
*/
public static String unicodeToString(String str) {
Pattern pattern = Pattern.compile("(\\\\u(\\p{XDigit}{2,4}))");
Matcher matcher = pattern.matcher(str);
char ch;
while (matcher.find()) {
ch = (char) Integer.parseInt(matcher.group(2), 16);
str = str.replace(matcher.group(1), ch + "");
}
return str;
}

   /**
   * 获取非表情字符串
   * @param input
   * @return
   */
   public static String getNonEmojiString(String input) {
       int prev = 0;
       StringBuilder sb = new StringBuilder();
       List<UnicodeCandidate> replacements = getUnicodeCandidates(input);
       for (UnicodeCandidate candidate : replacements) {
       sb.append(input.substring(prev, candidate.getEmojiStartIndex()));
       prev = candidate.getFitzpatrickEndIndex();
       }
       return sb.append(input.substring(prev)).toString();
   }

   /**
   * 获取表情字符串
   * @param input
   * @return
   */
   public static String getEmojiUnicodeString(String input){
       EmojiTransformer transformer = new EmojiTransformer() {
       public String transform(UnicodeCandidate unicodeCandidate) {
       return unicodeCandidate.getEmoji().getHtmlHexadecimal();
       }
       };
       StringBuilder sb = new StringBuilder();
       List<UnicodeCandidate> replacements = getUnicodeCandidates(input);
       for (UnicodeCandidate candidate : replacements) {
       sb.append(transformer.transform(candidate));
       }
       return parseToUnicode(sb.toString());
   }
   /**
   * 检测是否有emoji字符
   * @param source
   * @return 一旦含有就抛出
   */
   public static boolean containsEmoji(String source) {
   if (StringUtils.isBlank(source)) {
   return false;
   }

int len = source.length();

for (int i = 0; i < len; i++) {
char codePoint = source.charAt(i);

   if (isEmojiCharacter(codePoint)) {
   //do nothing，判断到了这里表明，确认有表情字符
   return true;
   }
   }

return false;
}

   /**
   * 过滤emoji 或者其他非文字类型的字符
   * @param source
   * @return
   */
   public static String filterEmoji(String source) {
   source = source.replaceAll("[\\ud800\\udc00-\\udbff\\udfff\\ud800-\\udfff]", "*");
   if (!containsEmoji(source)) {
   return source;//如果不包含，直接返回
   }
   //到这里铁定包含
   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);
   } else {
   buf.append("*");
   }
   }

   if (buf == null) {
   return source;//如果没有找到 emoji表情，则返回源字符串
   } else {
   if (buf.length() == len) {//这里的意义在于尽可能少的toString，因为会重新生成字符串
   buf = null;
   return source;
   } else {
   return buf.toString();
   }
   }

}
}

三。调用该工具方法

String content = EmojiUtil.onlyEmojiToUnicode("内容");

Java之~ 存储表情图EmojiUtil工具类

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