将用户表数据按照用户姓名首字母进行分组排序输出-pinyin4j_net.sourceforge.pinyin4j 下载

一、需要pinyin4j-2.5.0.jar

下载地址：Download pinyin4j-2.5.0.jar : pinyin4j « p « Jar File Download

二、引入

        <dependency>
            <groupId>net.sourceforge.pinyin4j</groupId>
            <artifactId>pinyin4j</artifactId>
            <version>2.5.0</version>
        </dependency>

三、建Util

package com.wei.utils;
 
import java.text.Collator;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Map;
import java.util.TreeMap;
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;
 
/**
 * @author mq
 * @date 2022/9/2 14:23
 */
public class PinyinUtil {
 
    /**
     * 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(java.util.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;
    }
 
}

三、Test

public static void main(String[] args){
        //模拟数据
        List<SysUser> sysUsers = new ArrayList<>();
        SysUser sysUser = new SysUser();
        sysUser.setId(1L);
        sysUser.setUsername("马强");
        sysUsers.add(sysUser);
        SysUser sysUser2 = new SysUser();
        sysUser2.setId(2L);
        sysUser2.setUsername("李强");
        sysUsers.add(sysUser2);
        SysUser sysUser3 = new SysUser();
        sysUser3.setId(3L);
        sysUser3.setUsername("啊强");
        sysUsers.add(sysUser3);
        SysUser sysUser4 = new SysUser();
        sysUser4.setId(4L);
        sysUser4.setUsername("阿妹");
        sysUsers.add(sysUser4);
        SysUser sysUser5 = new SysUser();
        sysUser5.setId(5L);
        sysUser5.setUsername("郑强");
        sysUsers.add(sysUser5);
 
        List<Map<String, Object>> mapList = new ArrayList<>();
        for (int i = 1; i < 27; i++) {
            Map<String, Object> map = new TreeMap<>();
            // 输出26个字母（大写）
            String letter = String.valueOf((char)(96 + i)).toUpperCase();
            //以此字母为首字母的数据集
            List<SysUser> users = new ArrayList<>();
            // 循环找出与首字母一样的数据
            for (SysUser user : sysUsers) {
                //获取汉字串拼音，英文字符不变
                String pybf = PinyinUtil.getFullSpell(user.getUsername());
                //首字母（大写）
                String Initials = pybf.substring(0, 1);
                if (letter.equals(Initials)) {
                    users.add(user);
                }
            }
            map.put("key",letter);
            map.put("list", users);
            mapList.add(map);
        }
        System.out.println("排序后的数据为 ==> " + mapList.toString());
 
 
    }

效果：

排序后的数据为 == > [{
	key = A,
	list = [SysUser(id=3,username = 啊强), SysUser(id=4,username=阿妹)]
}, {
	key = B,
	list = []
}, {
	key = C,
	list = []
}, {
	key = D,
	list = []
}, {
	key = E,
	list = []
}, {
	key = F,
	list = []
}, {
	key = G,
	list = []
}, {
	key = H,
	list = []
}, {
	key = I,
	list = []
}, {
	key = J,
	list = []
}, {
	key = K,
	list = []
}, {
	key = L,
	list = [SysUser(id=2,username = 李强)]
}, {
	key = M,
	list = [SysUser(id=1,username = 马强]
}, {
	key = N,
	list = []
}, {
	key = O,
	list = []
}, {
	key = P,
	list = []
}, {
	key = Q,
	list = []
}, {
	key = R,
	list = []
}, {
	key = S,
	list = []
}, {
	key = T,
	list = []
}, {
	key = U,
	list = []
}, {
	key = V,
	list = []
}, {
	key = W,
	list = []
}, {
	key = X,
	list = []
}, {
	key = Y,
	list = []
}, {
	key = Z,
	list = [SysUser(id=5,username = 郑强)]
}]