1、正则表达式来判断字符串中是否包含字母

   /**
     * 使用正则表达式来判断字符串中是否包含字母
     * @param str 待检验的字符串
     * @return 返回是否包含
     * true: 包含字母 ;false 不包含字母
     */
    public static boolean judgeContainsStr(String str) {
        String regex=".*[a-zA-Z]+.*";
        Matcher m= Pattern.compile(regex).matcher(str);
        return m.matches();
    }

2、获得汉字首字母（通常用作通讯录检索）

 public static String getAlpha(String chines) {
        String pinyinName = "";
        char[] nameChar = chines.toCharArray();
        HanyuPinyinOutputFormat defaultFormat = new HanyuPinyinOutputFormat();
        defaultFormat.setCaseType(HanyuPinyinCaseType.UPPERCASE);
        defaultFormat.setToneType(HanyuPinyinToneType.WITHOUT_TONE);
        for (int i = 0; i < nameChar.length; i++) {
            System.out.println(nameChar[i]);
            if (nameChar[i] > 128) {
                try {
                    String[] ac = PinyinHelper.toHanyuPinyinStringArray(nameChar[i], defaultFormat);
                    if(ac!=null&&ac.length>0){
                        pinyinName += PinyinHelper.toHanyuPinyinStringArray(nameChar[i], defaultFormat)[0].charAt(0);
                    }
                } catch (BadHanyuPinyinOutputFormatCombination e) {
                    return "#";
                } catch (Exception e){
                    return "#";
                }
            } else {
                if(judgeContainsStr(String.valueOf(nameChar[i]))){
                    pinyinName += nameChar[i];
                }else{
                    pinyinName += "#";
                }

            }
        }
        return pinyinName;
    }

3、获得汉语拼音首字母简称

public static String getAlphaDefaultCode(String chines) {
    String pinyinName = "";
    char[] nameChar = chines.toCharArray();
    HanyuPinyinOutputFormat defaultFormat = new HanyuPinyinOutputFormat();
    defaultFormat.setCaseType(HanyuPinyinCaseType.UPPERCASE);
    defaultFormat.setToneType(HanyuPinyinToneType.WITHOUT_TONE);
    for (int i = 0; i < nameChar.length; i++) {
        if (nameChar[i] > 128) {
            try {
                String[] ac = PinyinHelper.toHanyuPinyinStringArray(nameChar[i], defaultFormat);
                if(ac!=null&&ac.length>0){
                    pinyinName += PinyinHelper.toHanyuPinyinStringArray(nameChar[i], defaultFormat)[0].charAt(0);
                }
            } catch (BadHanyuPinyinOutputFormatCombination e) {
                return "#";
            } catch (Exception e){
                return "#";
            }
        } else {
            if(judgeContainsStr(String.valueOf(nameChar[i]))){
                pinyinName += nameChar[i];
            }else{
                pinyinName += "#";
            }
        }
    }
    if(StringUtils.isBlank(pinyinName)){
        pinyinName = "#";
    }
    return pinyinName;
}

4、将字符串中的中文转化为拼音,英文字符不变

  /**
     * 将字符串中的中文转化为拼音,英文字符不变
     *
     * @param inputString
     *            汉字
     * @return
     */
    public static String getPingYin(String inputString) {
        inputString = cleanChar(inputString);
        HanyuPinyinOutputFormat format = new HanyuPinyinOutputFormat();
        format.setCaseType(HanyuPinyinCaseType.LOWERCASE);
        format.setToneType(HanyuPinyinToneType.WITHOUT_TONE);
        format.setVCharType(HanyuPinyinVCharType.WITH_V);
        String output = "";
        if (inputString != null && inputString.length() > 0 && !"null".equals(inputString)) {
            char[] input = inputString.trim().toCharArray();
            try {
                for (int i = 0; i < input.length; i++) {
                    if (Character.toString(input[i]).matches("[\\u4E00-\\u9FA5]+")) {
                        String[] temp = PinyinHelper.toHanyuPinyinStringArray(input[i], format);
                        output += temp[0];
                    } else
                        output += Character.toString(input[i]);
                }
            } catch (BadHanyuPinyinOutputFormatCombination e) {
                e.printStackTrace();
            }
        } else {
            return "*";
        }
        return output;
    }

5、汉字转换位汉语拼音首字母，英文字符不变

 /**
     * 汉字转换位汉语拼音首字母，英文字符不变
     *
     * @param chines
     *            汉字
     * @return 拼音
     */
    public static String converterToFirstSpell(String chines) {
        chines = cleanChar(chines);
        String pinyinName = "";
        char[] nameChar = chines.toCharArray();
        HanyuPinyinOutputFormat defaultFormat = new HanyuPinyinOutputFormat();
        defaultFormat.setCaseType(HanyuPinyinCaseType.UPPERCASE);
        defaultFormat.setToneType(HanyuPinyinToneType.WITHOUT_TONE);
        for (int i = 0; i < nameChar.length; i++) {
            if (nameChar[i] > 128) {
                try {
                    pinyinName += PinyinHelper.toHanyuPinyinStringArray(nameChar[i], defaultFormat)[0].charAt(0);
                } catch (BadHanyuPinyinOutputFormatCombination e) {
                    e.printStackTrace();
                }
            } else {
                pinyinName += nameChar[i];
            }
        }
        return pinyinName;
    }

6、清理特殊字符

    /**
     * 清理特殊字符
     * @param chines
     * @return
     */
   public static String cleanChar(String chines) {
        chines = chines.replaceAll("[\\p{Punct}\\p{Space}]+", ""); // 正则去掉所有字符操作
        // 正则表达式去掉所有中文的特殊符号
        String regEx = "[`~!@#$%^&*()+=|{}':;',\\[\\].<>/?~！@#￥%……&*（）——+|{}<>《》【】‘；：”“’。，、？]";
        Pattern pattern = Pattern.compile(regEx);
        Matcher matcher = pattern.matcher(chines);
        chines = matcher.replaceAll("").trim();
        return chines;
    }

测试：

    public static void main(String[] args) {
        System.out.println("==获得汉字首字母:======="+getAlpha("测试"));
        System.out.println("==获得汉语拼音首字母:======="+getAlphaDefaultCode("测试一下"));
        System.out.println("==中文转化为拼音,英文字符不变:======="+getPingYin("测试一下test"));
        System.out.println("==汉语拼音首字母，英文字符不变:======="+converterToFirstSpell("测试一下test"));
        System.out.println("==清理特殊字符:======="+cleanChar("测试一下2！@#￥%……SDmm"));
    }
}

结果：

测
试
==获得汉字首字母:=======CS
==获得汉语拼音首字母:=======CSYX
==中文转化为拼音,英文字符不变:=======ceshiyixiatest
==汉语拼音首字母，英文字符不变:=======CSYXtest
==清理特殊字符:=======测试一下2SDmm

Process finished with exit code 0