获取中文字符串首字母

依赖

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

工具类

import net.sourceforge.pinyin4j.PinyinHelper;

public class PinyinUtils {

    /**
     * 获取中文字符串的拼音首字母
     */

    public static String getInitial(String chinese) {
        if (chinese == null || chinese.length() == 0) {
            return "";
        }
        char firstChar = chinese.charAt(0);
        // 判断是否为中文字符
        if (Character.toString(firstChar).matches("[\\u4E00-\\u9FA5]+")) {
            // 使用 Pinyin4j 将中文转换为拼音数组
            String[] pinyinArray = PinyinHelper.toHanyuPinyinStringArray(firstChar);
            if (pinyinArray != null && pinyinArray.length > 0) {
                // 提取拼音的首字母作为首字母字段的值
                return String.valueOf(pinyinArray[0].charAt(0)).toUpperCase();
            }
        }
        // 非中文字符，直接返回首字母的大写形式
        return String.valueOf(firstChar).toUpperCase();
    }
}

Mapper 接口

    List<String> getName();

    void updateInitial(String name, String initial);

对应映射文件

    <update id="updateInitial">
        update t_area_info
        set initial = #{initial}
        where area_name = #{name}
    </update>
    <select id="getName" resultType="java.lang.String">
        SELECT area_name FROM `t_area_info`;
    </select>

测试方法

    @Test
    void testGetPinyin() {
        List<String> nameList = firmwareFunctionMapper.getName();
        HashMap<String, String> map = new HashMap<>();
        for (String e : nameList) {
            String initial = PinyinUtils.getInitial(e);
            map.put(e, initial);
        }
        System.out.println("===================");
        System.out.println("map = " + map);
        System.out.println("size = " + map.size());
        System.out.println("===================");
        for (String name : nameList) {
            String initial = map.get(name);
            firmwareFunctionMapper.updateInitial(name, initial);
        }
    }