最近在工作开发中有一个需求，需要将用户的中文名转换为拼音。经过一番搜索之后，我找到了实现方法。
首先引入第三方jar包pinyin4j-2.5.0.jar，对应的maven依赖如下：

<dependency>
    <groupId>com.github.open-android</groupId>
    <artifactId>pinyin4j</artifactId>
    <version>2.5.0</version>
</dependency>

具体实现代码如下：

package com.wunian.pinyin;

import net.sourceforge.pinyin4j.PinyinHelper;
import net.sourceforge.pinyin4j.format.HanyuPinyinOutputFormat;
import net.sourceforge.pinyin4j.format.HanyuPinyinToneType;

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

/**
 * @author wunian
 * @desc 汉字转拼音
 * @createTime 2020/7/16
 */
public class HanZi2PinYinDemo {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Scanner scanner =new Scanner(System.in);
        System.out.println("请输入汉字：");
        String hanzi = scanner.next();
        System.out.println("转换成拼音：");
        System.out.println(convertHanzi2Pinyin(hanzi, true));
    }


    public static String convertHanzi2Pinyin(String hanzi, boolean full) {
        /***
         * ^[\u2E80-\u9FFF]+$ 匹配所有东亚区的语言 ^[\u4E00-\u9FFF]+$ 匹配简体和繁体
         * ^[\u4E00-\u9FA5]+$ 匹配简体
         */
        String regExp = "^[\u4E00-\u9FFF]+$";
        StringBuffer sb = new StringBuffer();
        if (hanzi == null || "".equals(hanzi.trim())) {
            return "";
        }
        String pinyin = "";
        for (int i = 0; i < hanzi.length(); i++) {
            char unit = hanzi.charAt(i);
            if (match(String.valueOf(unit), regExp))// 是汉字，则转拼音
            {
                pinyin = convertSingleHanzi2Pinyin(unit);
                if (full) {
                    sb.append(pinyin);
                } else {
                    sb.append(pinyin.charAt(0));
                }
            } else {
                sb.append(unit);
            }
        }
        return sb.toString();
    }

    /***
     * 将单个汉字转成拼音
     *
     * @param hanzi
     * @return
     */
    private static String convertSingleHanzi2Pinyin(char hanzi) {
        HanyuPinyinOutputFormat outputFormat = new HanyuPinyinOutputFormat();
        outputFormat.setToneType(HanyuPinyinToneType.WITHOUT_TONE);
        String[] res;
        StringBuffer sb = new StringBuffer();
        try {
            res = PinyinHelper.toHanyuPinyinStringArray(hanzi, outputFormat);
            sb.append(res[0]);// 对于多音字，只用第一个拼音
        } catch (Exception e) {
            e.printStackTrace();
            return "";
        }
        return sb.toString();
    }

    /***
     * @param str
     * 源字符串
     * @param regex
     * 正则表达式
     * @return 是否匹配
     */
    public static boolean match(String str, String regex) {
        Pattern pattern = Pattern.compile(regex);
        Matcher matcher = pattern.matcher(str);
        return matcher.find();
    }
}