java产生随机字符串的各种方法------工具类（包含过滤表情方法）

红太狼 2022-06-18 08:12 155阅读 0赞

1.不多说直接上代码，看注释，代码 如下：

import java.util.Random;
    import java.util.regex.Matcher;
    import java.util.regex.Pattern;
    
    public class CharacterUtil
    {
    
        private static Random strGen = new Random();;
    
        private static Random numGen = new Random();;
    
        private static char[] numbersAndLetters = ("0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ").toCharArray();;
    
        private static char[] numbers = ("0123456789").toCharArray();;
    
        /**

* 产生随机字符串（可以指定长度）

* */

public static final String randomString(int length)
        {
            if (length < 1)
            {
                return null;
            }
            char[] randBuffer = new char[length];
            for (int i = 0; i < randBuffer.length; i++)
            {
                randBuffer[i] = numbersAndLetters[strGen.nextInt(61)];
            }
            return new String(randBuffer);
        }
    
        /**

* 产生随机数值字符串 （可以指定长度）

* */
        public static final String randomNumStr(int length)
        {
            if (length < 1)
            {
                return null;
            }
            char[] randBuffer = new char[length];
            for (int i = 0; i < randBuffer.length; i++)
            {
                randBuffer[i] = numbers[numGen.nextInt(9)];
            }
            return new String(randBuffer);
        }
    
        /**
         * emojiFilter
         * @Description: 过滤emoji表情
         * @param source
         * @return
         */
        public static String emojiFilter(String source)
        {
            if (source != null)
            {
                Pattern emoji = Pattern
                        .compile(
                                "[\ud83c\udc00-\ud83c\udfff]|[\ud83d\udc00-\ud83d\udfff]|[\u2600-\u27ff]",
                                Pattern.UNICODE_CASE | Pattern.CASE_INSENSITIVE);
                Matcher emojiMatcher = emoji.matcher(source);
                if (emojiMatcher.find())
                {
                    source = emojiMatcher.replaceAll("*");
                    return source;
                }
                return source;
            }
            return source;
        }
    
        /**
         * 字符串转换unicode
         */
        public static String string2Unicode(String string)
        {
            StringBuffer unicode = new StringBuffer();
            for (int i = 0; i < string.length(); i++)
            {
                // 取出每一个字符
                char c = string.charAt(i);
                // 转换为unicode
                unicode.append("\\u" + Integer.toHexString(c));
            }
            return unicode.toString();
        }
    
        /**
         * unicode 转字符串
         */
        public static String unicode2String(String unicode)
        {
            StringBuffer string = new StringBuffer();
            String[] hex = unicode.split("\\\\u");
            for (int i = 1; i < hex.length; i++)
            {
                // 转换出每一个代码点
                int data = Integer.parseInt(hex[i], 16);
                // 追加成string
                string.append((char) data);
            }
            return string.toString();
        }
    
    }