对List＜Map＞数据排序

川长思鸟来 2022-11-20 09:56 229阅读 0赞

### 对List< Map >数据排序 ###

*   *  原始数据
     *  排序规则
     *  MapCompare类
     *  具体代码
     *  多重条件排序时
     *  排序后结果

## 原始数据 ##

## 排序规则 ##

按kpScore倒序排列

list.stream().sorted(Comparator.comparing(MapCompare::comparingByKpScore).reversed())
                            .collect(Collectors.toList());

## MapCompare类 ##

public class MapCompare {
    
        public static BigDecimal comparingByKpScore(Map map){
            return (BigDecimal) map.get("kpScore");
        }
    //、、、、、、如果需要其他字段排序可在下方补充
    }

## 具体代码 ##

public List<Map> getKpListByChapterIdOrder(String chapterId) {
    		//获取原始数据
            List<Map> resuList = getKpListByChapterId(chapterId.toString());
            //对原始数据字段进行整理
            //返回值list
            List<Map> chapterKpIds = new ArrayList<>();
            Map resuMap;
            //遍历取子级知识点
            for (Map map : resuList) {
                //判断是否有子级
                List<Map> childList = (List<Map>) map.get("childList");
                if (CollectionUtils.isNotEmpty(childList)) {
                    //有子级知识点，则取子级知识点
                    for (Map cm : childList) {
                        resuMap = new HashMap(8);
                        resuMap.put("kpId",cm.get("kpId").toString());
                        resuMap.put("kpName",cm.get("kpName"));
                        resuMap.put("kpScore",cm.get("kpScore"));
                        chapterKpIds.add(resuMap);
                    }
    
                }else {
                    //没有子级则取父级
                    resuMap = new HashMap(8);
                    resuMap.put("kpId",map.get("kpId").toString());
                    resuMap.put("kpName",map.get("kpName"));
                    resuMap.put("kpScore",map.get("kpScore"));
                    chapterKpIds.add(resuMap);
                }
            }
            //按kpScore倒序排列
            chapterKpIds =
                    chapterKpIds.stream().sorted(Comparator.comparing(MapCompare::comparingByKpScore).reversed())
                            .collect(Collectors.toList());
            //返回数据
            return chapterKpIds;
        }

## 多重条件排序时 ##

list.stream().sorted(Comparator.comparing(MapCompare::comparingByKpScore).reversed()
    				.thenComparing(Comparator.comparing(MapCompare::comparingByOther)))
                            .collect(Collectors.toList());

## 排序后结果 ##

[{"kpScore":1.20,"kpName":"消费税征税范围","kpId":"2105"},{"kpScore":1.15,"kpName":"增值税专用发票使用规定","kpId":"2101"},{"kpScore":1.05,"kpName":"增值税税收优惠","kpId":"2097"},{"kpScore":1.00,"kpName":"增值税应纳税额的计算-一般计税方法应纳税额的计算","kpId":"2091"},{"kpScore":1.00,"kpName":"增值税应纳税额的计算-简易计税方法应纳税额的计算","kpId":"2093"},{"kpScore":0.67,"kpName":"增值税应纳税额的计算-进口货物应纳税额的计算","kpId":"2095"},{"kpScore":0.67,"kpName":"消费税税率","kpId":"2109"},{"kpScore":0.62,"kpName":"现行税种与征收机关","kpId":"2057"},{"kpScore":0.62,"kpName":"增值税征收管理","kpId":"2099"},{"kpScore":0.52,"kpName":"消费税税目","kpId":"2107"},{"kpScore":0.50,"kpName":"消费税应纳税额的计算-销售额的确定","kpId":"2113"},{"kpScore":0.50,"kpName":"消费税应纳税额的计算-应纳税额的计算","kpId":"2115"},{"kpScore":0.49,"kpName":"消费税应纳税额的计算-已纳消费税的扣除","kpId":"2117"},{"kpScore":0.43,"kpName":"增值税纳税人和扣缴义务人","kpId":"2059"},{"kpScore":0.43,"kpName":"消费税征收管理","kpId":"2119"},{"kpScore":0.20,"kpName":"增值税征税范围-销售货物","kpId":"2063"},{"kpScore":0.20,"kpName":"增值税征税范围-销售劳务","kpId":"2065"},{"kpScore":0.20,"kpName":"增值税征税范围-销售服务","kpId":"2067"},{"kpScore":0.20,"kpName":"增值税征税范围-销售无形资产","kpId":"2069"},{"kpScore":0.20,"kpName":"增值税征税范围-销售不动产","kpId":"2071"},{"kpScore":0.20,"kpName":"增值税征税范围-进口货物","kpId":"2073"},{"kpScore":0.20,"kpName":"增值税征税范围-非经营活动的界定","kpId":"2075"},{"kpScore":0.20,"kpName":"增值税征税范围-境内销售服务、无形资产或者不动产的界定","kpId":"2077"},{"kpScore":0.19,"kpName":"增值税征税范围-视同销售货物行为","kpId":"2079"},{"kpScore":0.19,"kpName":"增值税征税范围-不征收增值税项目","kpId":"2085"},{"kpScore":0.19,"kpName":"税收与税收法律关系","kpId":"2053"},{"kpScore":0.19,"kpName":"增值税税率和征收率","kpId":"2087"},{"kpScore":0.00,"kpName":"增值税征税范围-混合销售","kpId":"2081"},{"kpScore":0.00,"kpName":"增值税征税范围-兼营","kpId":"2083"},{"kpScore":0.00,"kpName":"税法要素","kpId":"2055"},{"kpScore":0.00,"kpName":"消费税纳税人","kpId":"2103"},{"kpScore":0.00,"kpName":"第四章小结","kpId":"2121"}]