java stream distinct()如何按一个或多个指定对象字段进行去重

List<ProjectInfoVo> acceptances = vo.stream().filter(distinct(b -> b.getProjectId())).collect(Collectors.toList()); 

List<ProjectInfoVo> acceptances = vo.stream().distinct().collect(Collectors.toList());

Comparator.comparing(p -> p.get***())

String sql = "";
List<ProjectInfoVo> vo = jdbcTemplate.query(sql, new BeanPropertyRowMapper<>(ProjectInfoVo.class));
ArrayList<ProjectInfoVo> collect = vo.stream().collect(Collectors.collectingAndThen(
            Collectors.toCollection(() -> new TreeSet<>(
                    Comparator.comparing(p -> p.getProjectId()))), ArrayList::new));

String sql = "";
List<ProjectInfoVo> vo = jdbcTemplate.query(sql, new BeanPropertyRowMapper<>(ProjectInfoVo.class));
ArrayList<ProjectInfoVo> collect = vo.stream().collect(Collectors.collectingAndThen(
            Collectors.toCollection(() -> new TreeSet<>(
                    Comparator.comparing(p -> p.getProjectId()+";"+p.getMember()))), ArrayList::new));

Comparator.comparing(p -> p.get***())

public class StreamUtils {

    /**
     * 按某个指定字段去重
     *
     * @param keyExtractor 需要去重的字段
     * @return java.util.function.Predicate<T>
     * @author 陈賝
     * @date 2022/9/2 13:49
     */
    public static <T> Predicate<T> distinctByKey(Function<? super T, ?> keyExtractor) {
        Map<Object, Boolean> seen = new ConcurrentHashMap<>();
        return t -> seen.putIfAbsent(keyExtractor.apply(t), Boolean.TRUE) == null;
    }
}

List<ProjectInfoVo> acceptances = vo.stream()
	.filter(StreamUtils.distinctByKey(b -> b.getProjectId()))
	.collect(Collectors.toList());

List<ProjectInfoVo> acceptances = vo.stream()
	.filter(StreamUtils.distinctByKey(b -> b.getProjectId()))
	.filter(StreamUtils.distinctByKey(b -> b.getMember()))
	.collect(Collectors.toList());

    private static List<CompanyVo> mergeAndDistinct(List<CompanyVo> companyVoList) {
//        return companyVoList.stream().collect(Collectors.collectingAndThen(
//                Collectors.toCollection(() -> new TreeSet<>(
//                        Comparator.comparing(CompanyVo::getId))), ArrayList::new));
        return new ArrayList<>(companyVoList.stream()
                .collect(Collectors.toMap(
                        CompanyVo::getId, // 以 id 作为 key
                        companyVo -> companyVo, // 保留 CompanyVo 对象
                        (existing, replacement) -> existing // 如果有重复的 id，保留已有的对象
                )).values());
    }

    private static List<CompanyVo> mergeAndDistinct(List<CompanyVo> companyVoList) {
        return new ArrayList<>(companyVoList.stream()
                .collect(Collectors.toMap(
                        companyVo -> companyVo.getId() + "-" + companyVo.getCode(), // 使用 id 和 code 作为 key
                        companyVo -> companyVo, // 保留 CompanyVo 对象
                        (existing, replacement) -> existing // 如果有重复的 id，保留已有的对象
                )).values());
    }