借助Map实现List<Map<String,Object>>一对多处理

1：将下面类型数据格式

[
{
"YZPZXH": 10013719000000038075,
"YZPZMXXH": 2,
"ZSXMMC": "增值税",
"ZSPMMC": "其他行业（17%、16%、13%）",
"JSYJ": 10000000,
"YNSE": 97906.22,
"YZFSRQ": "2019-06-30",
"SKSSQQ": "2019-06-01",
"SKSSQZ": "2019-06-30",
"JKQX": "2019-07-15",
"ZGSWSKFJ_DM": "13702021400",
"YJSKZTMC": "未到期应缴",
"SKCLLXMC": "扣款锁定",
"SKCLLX_DM": "5"
},
{
"YZPZXH": 10013719000000038075,
"YZPZMXXH": 3,
"ZSXMMC": "地方教育附加",
"ZSPMMC": "增值税地方教育附加",
"JSYJ": 979006.22,
"YNSE": 19580.1244,
"YZFSRQ": "2019-06-30",
"SKSSQQ": "2019-06-01",
"SKSSQZ": "2019-06-30",
"JKQX": "2019-07-15",
"ZGSWSKFJ_DM": "13702021400",
"YJSKZTMC": "未到期应缴",
"SKCLLXMC": "扣款锁定",
"SKCLLX_DM": "5"
},
{
"YZPZXH": 10013720000000005844,
"YZPZMXXH": 4,
"ZSXMMC": "城市维护建设税",
"ZSPMMC": "市区（增值税附征）",
"JSYJ": 317.46,
"YNSE": 22.22,
"YZFSRQ": "2020-03-31",
"SKSSQQ": "2020-03-01",
"SKSSQZ": "2020-03-31",
"JKQX": "2020-04-20",
"ZGSWSKFJ_DM": "13702021400",
"YJSKZTMC": "未到期应缴",
"SKCLLXMC": "正常",
"SKCLLX_DM": "0"
}
]

转换为：

[
    {
        "YZPZXH": "10013719000000038075",
        "DATA": [
            {
                "ZSXMMC": "增值税",
                "ZGSWSKFJ_DM": "13702021400",
                "YZPZXH": 10013719000000038075,
                "YZPZMXXH": 2,
                "SKCLLXMC": "扣款锁定",
                "YZFSRQ": "2019-06-30",
                "YJSKZTMC": "未到期应缴",
                "SKSSQQ": "2019-06-01",
                "SKSSQZ": "2019-06-30",
                "SKCLLX_DM": "5",
                "YNSE": 97906.22,
                "JKQX": "2019-07-15",
                "ZSPMMC": "其他行业（17%、16%、13%）",
                "JSYJ": 10000000
            },
            {
                "ZSXMMC": "地方教育附加",
                "ZGSWSKFJ_DM": "13702021400",
                "YZPZXH": 10013719000000038075,
                "YZPZMXXH": 3,
                "SKCLLXMC": "扣款锁定",
                "YZFSRQ": "2019-06-30",
                "YJSKZTMC": "未到期应缴",
                "SKSSQQ": "2019-06-01",
                "SKSSQZ": "2019-06-30",
                "SKCLLX_DM": "5",
                "YNSE": 19580.1244,
                "JKQX": "2019-07-15",
                "ZSPMMC": "增值税地方教育附加",
                "JSYJ": 979006.22
            }
        ]
    },
    {
        "YZPZXH": "10013720000000005844",
        "DATA": [
            {
                "ZSXMMC": "增值税",
                "ZGSWSKFJ_DM": "13702021400",
                "YZPZXH": 10013720000000005844,
                "YZPZMXXH": 1,
                "SKCLLXMC": "正常",
                "YZFSRQ": "2020-03-31",
                "YJSKZTMC": "未到期应缴",
                "SKSSQQ": "2020-03-01",
                "SKSSQZ": "2020-03-31",
                "SKCLLX_DM": "0",
                "YNSE": 317.46,
                "JKQX": "2020-04-20",
                "ZSPMMC": "建筑物（11%、10%、9%、5%）-增量房",
                "JSYJ": 10581.9
            }
        ]
    }
]

2：代码案例

private List<Map<String,Object>> fzcl(List<Map<String,Object>> list){
        //以YZPZXH作为KEY放置到Map中
        Map<String,List<Map<String,Object>>> resultMap = new HashMap<String,List<Map<String,Object>>>();
        
        for(Map<String,Object> m:list){
            String YZPZXH = ""+m.get("YZPZXH");
            
            List<Map<String,Object>> tmpList;
            if(resultMap.containsKey(YZPZXH)){
                tmpList = resultMap.get(YZPZXH);
                
                tmpList.add(m);
            }else{
                tmpList = new ArrayList<Map<String,Object>>();
                tmpList.add(m);
            }
            
            resultMap.put(YZPZXH, tmpList);
        }
        
        
        List<Map<String,Object>> resultList = new ArrayList<Map<String,Object>>();
        
        //遍历Map组装结果数据
        for (Map.Entry<String,List<Map<String,Object>>> entry : resultMap.entrySet()) {
            Map<String,Object> tmpMap = new HashMap<String,Object>();
            tmpMap.put("YZPZXH", entry.getKey());
            tmpMap.put("DATA", entry.getValue());
            
            resultList.add(tmpMap);
        }
        
        return resultList;
    }