Caracteres chinos a pinyin

1. Importar dependencias

<dependency>
    <groupId>com.belerweb</groupId>
    <artifactId>pinyin4j</artifactId>
    <version>2.5.1</version>
</dependency>

2. Código

package com.test.utils;

import net.sourceforge.pinyin4j.PinyinHelper;
import net.sourceforge.pinyin4j.format.HanyuPinyinCaseType;
import net.sourceforge.pinyin4j.format.HanyuPinyinOutputFormat;
import net.sourceforge.pinyin4j.format.HanyuPinyinToneType;
import net.sourceforge.pinyin4j.format.HanyuPinyinVCharType;
import net.sourceforge.pinyin4j.format.exception.BadHanyuPinyinOutputFormatCombination;

public class HanZiUtil {

    /**
     * 将中文转换为拼音（小写）
     *
     * @param str
     * @return
     */
    public static String getPingYinLower(String str) {
        char[] p1 = null;
        p1 = str.toCharArray();
        String[] p2 = new String[p1.length];
        HanyuPinyinOutputFormat p3 = new HanyuPinyinOutputFormat();
        p3.setCaseType(HanyuPinyinCaseType.LOWERCASE);
        p3.setToneType(HanyuPinyinToneType.WITHOUT_TONE);
        p3.setVCharType(HanyuPinyinVCharType.WITH_V);
        String p4 = "";
        int t0 = p1.length;
        try {
            for (int i = 0; i < t0; i++) {
                if (java.lang.Character.toString(p1[i]).matches("[\\u4E00-\\u9FA5]+")) {
                    p2 = PinyinHelper.toHanyuPinyinStringArray(p1[i], p3);
                    p4 += p2[0];
                } else
                    p4 += java.lang.Character.toString(p1[i]);
            }
            return p4;
        } catch (BadHanyuPinyinOutputFormatCombination e1) {
            e1.printStackTrace();
        }
        return p4;
    }

    /**
     * 将中文转换为拼音（大写）
     *
     * @param str
     * @return
     */
    public static String getPingYinUpper(String str) {
        StringBuilder sb = new StringBuilder();
        HanyuPinyinOutputFormat format = new HanyuPinyinOutputFormat();
        format.setCaseType(HanyuPinyinCaseType.LOWERCASE);// 拼音小写
        format.setToneType(HanyuPinyinToneType.WITHOUT_TONE);// 拼音不标声调
        format.setVCharType(HanyuPinyinVCharType.WITH_V);// u:的声母替换为v
        try {
            for (int i = 0; i < str.length(); i++) {
                String[] array = PinyinHelper.toHanyuPinyinStringArray(str.charAt(i), format); //转换为每个字符拼音数组集合
                if (array == null || array.length == 0) {//判断字符串是否为空
                    continue; //停止执行
                }
                String s = array[0];// 不管多音字,只取第一个
                char c = s.charAt(0);// 大写第一个字母
                String pinyin = String.valueOf(c).toUpperCase().concat(s.substring(1));//首写大写
                sb.append(pinyin);//拼接
            }
        } catch (BadHanyuPinyinOutputFormatCombination e) {
            e.printStackTrace();
        }
        return sb.toString();
    }

    /**
     * 获取中文首字母（小写）
     *
     * @param str
     * @return
     */
    public static String getPinYinHeadCharLower(String str) {
        String convert = "";
        for (int j = 0; j < str.length(); j++) {
            char word = str.charAt(j);
            String[] pinyinArray = PinyinHelper.toHanyuPinyinStringArray(word);
            if (pinyinArray != null) {
                convert += pinyinArray[0].charAt(0);
            } else {
                convert += word;
            }
        }
        return convert;
    }

    /**
     * 获取中文首字母（大写）
     *
     * @param str
     * @return
     */
    public static String getPinYinHeadCharUpper(String str) {
        StringBuilder sb = new StringBuilder();
        HanyuPinyinOutputFormat format = new HanyuPinyinOutputFormat();
        format.setCaseType(HanyuPinyinCaseType.LOWERCASE);// 拼音小写
        format.setToneType(HanyuPinyinToneType.WITHOUT_TONE);// 拼音不标声调
        format.setVCharType(HanyuPinyinVCharType.WITH_V);// u:的声母替换为v
        try {
            for (int i = 0; i < str.length(); i++) {//获取字符长度
                String[] array = PinyinHelper.toHanyuPinyinStringArray(str.charAt(i), format); //转换为每个字符拼音数组集合
                if (array == null || array.length == 0) { //判断字符串是否为空
                    continue; //停止执行
                }
                String s = array[0];// 不管多音字,只取第一个
                char c = s.charAt(0);// 第一个字母
                String pinyin = String.valueOf(c).toUpperCase();
                sb.append(pinyin);//拼接
            }
        } catch (BadHanyuPinyinOutputFormatCombination e) {
            e.printStackTrace();
        }
        return sb.toString();
    }

}