JDK8的lambda方式List多字段排序List.stream().sorted()

诸葛小猿2023-09-05 9:07

多字段排序

java 复制代码

List<HumanDetailDownloadVO> collect = dataList.stream().sorted(
        // 日期 倒序  
        Comparator.comparing(HumanDetailDownloadVO::getDate_str, Comparator.reverseOrder())
                // 仓id 倒序 
                .thenComparing(HumanDetailDownloadVO::getSite_code, Comparator.reverseOrder())
                // 用户名升序  自定义比较器  拼音排序
                .thenComparing(HumanDetailDownloadVO::getUser_name, new ChineseComparator())
                // 大类code 升序
                .thenComparing(HumanDetailDownloadVO::getPosition_code, Comparator.naturalOrder())
                // 小类code 升序
                .thenComparing(HumanDetailDownloadVO::getTask_code, Comparator.naturalOrder()))
        .collect(Collectors.toList());

拼音排序：

引入jar包:

java 复制代码

<!--        汉字拼音排序-->
        <dependency>
            <groupId>com.belerweb</groupId>
            <artifactId>pinyin4j</artifactId>
            <version>2.5.1</version>
        </dependency>

自定义比较器：

复制代码

package XXXXXXXXXXXXXXXX;

import net.sourceforge.pinyin4j.PinyinHelper;
import net.sourceforge.pinyin4j.format.HanyuPinyinOutputFormat;
import net.sourceforge.pinyin4j.format.exception.BadHanyuPinyinOutputFormatCombination;

import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;

public class ChineseComparator implements Comparator<String> {

    HanyuPinyinOutputFormat pinyinOutputFormat = new HanyuPinyinOutputFormat();

    @Override
    public int compare(String o1, String o2) {

        String pinyin1 = null;
        String pinyin2 = null;
        try {
            pinyin1 = PinyinHelper.toHanYuPinyinString(o1, pinyinOutputFormat, " ", true);
            pinyin2 = PinyinHelper.toHanYuPinyinString(o2, pinyinOutputFormat, " ", true);
            System.out.println("pinyin1=" + pinyin1 + ", pinyin2=" + pinyin2);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return pinyin1.compareTo(pinyin2);
    }

}

结束。