很多项目中，需要用到中文名称到首字母进行分组，例如：城市、游戏等等。。。

java">/*** 将集合数据按照汉字首字母分组排序** @param list* @return*/public Map<String, Object> screenManufacturer(List<Game> list) {Set<String> hasAddedNameSet = new HashSet<>();long start = System.currentTimeMillis();try {// 输出26个字母Map<String, Object> map = new TreeMap<>();int n = 0;for (int i = 1; i < 27; i++) {String word = String.valueOf((char) (96 + i)).toUpperCase();// 循环找出 首字母一样的数据List<Game> letter = new ArrayList<>();for (Iterator<Game> iter = list.listIterator(); iter.hasNext(); ) {Game game = iter.next();if (hasAddedNameSet.contains(game.getName())) {continue;}String pybf = PinyinUtil.getFullSpell(game.getName());String firstWord = pybf.substring(0, 1);if (word.equalsIgnoreCase(firstWord)) {hasAddedNameSet.add(game.getName());letter.add(game);}n++;}map.put(word, letter);}log.info("总共循坏了{}次", n);long end = System.currentTimeMillis();log.info("总耗时：{}毫秒", end - start);return map;} catch (Exception e) {e.printStackTrace();}return null;}

java">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.exception.BadHanyuPinyinOutputFormatCombination;import java.text.Collator;
import java.util.*;public class PinyinUtil {public static void main(String[] args) {List<String> names = new ArrayList<>();names.add("张三");names.add("李四");names.add("王武");names.add("刘德华");names.add("精舍蓝军");Map<String, Object> stringObjectMap = screenManufacturer(names);System.out.println(stringObjectMap);}/*** 获取汉字串拼音，英文字符不变*/public static String getFullSpell(String chinese) {StringBuffer pybf = new StringBuffer();char[] arr = chinese.toCharArray();HanyuPinyinOutputFormat defaultFormat = new HanyuPinyinOutputFormat();defaultFormat.setCaseType(HanyuPinyinCaseType.UPPERCASE);defaultFormat.setToneType(HanyuPinyinToneType.WITHOUT_TONE);for (int i = 0; i < arr.length; i++) {if (arr[i] > 128) {try {pybf.append(PinyinHelper.toHanyuPinyinStringArray(arr[i], defaultFormat)[0]);} catch (BadHanyuPinyinOutputFormatCombination e) {e.printStackTrace();}} else {pybf.append(arr[i]);}}return pybf.toString();}/*** 将集合数据按照汉字首字母分组排序*/public static Map<String, Object> screenManufacturer(List<String> list) {try {Collator com = Collator.getInstance(Locale.CHINA);// 按字母排序Collections.sort(list, com);// 输出26个字母Map<String, Object> map = new TreeMap<>();for (int i = 1; i < 27; i++) {String word = String.valueOf((char) (96 + i)).toUpperCase();// 循环找出 首字母一样的数据List<String> letter = new ArrayList<>();for (String str : list) {String pybf = getFullSpell(str);String zm = pybf.substring(0, 1);if (word.equals(zm)) {letter.add(str);}}map.put(word, letter);}return map;} catch (Exception e) {e.printStackTrace();}return null;}}

POM文件

java">  <!--拼音--><dependency><groupId>com.belerweb</groupId><artifactId>pinyin4j</artifactId><version>2.5.0</version></dependency>

生成的效果

java">{"code": 200,"message": "操作成功","data": {"A": [],"B": [],"C": [{"gameId": "g123","name": "CS"}],"D": [{"gameId": "g123","name": "地下城勇士"},{"gameId": "g123","name": "DNF"},{"gameId": "g123","name": "DOTA"}],"E": [],"F": [],"G": [],"H": [],"I": [],"J": [],"K": [],"L": [],"M": [{"gameId": "g123","name": "魔兽世界"}],"N": [],"O": [],"P": [],"Q": [],"R": [],"S": [{"gameId": "g123","name": "守卫剑阁"}],"T": [{"gameId": "7fbf48bb3204","name": "test22"}],"U": [],"V": [],"W": [{"gameId": "g123","name": "王者荣耀"}],"X": [],"Y": [],"Z": [{"gameId": "g123","name": "诛仙"}]}
}