java中Map List的用法

返回的restful接口數據樣式：

{
     party: [
         {
             "finishTime": "20191105",
             "busiCnt": 1000
         }
     ]
 }

1、定義WzwScreenEntity 實體

public class WzwScreenEntity {

    private String finishTime;
    private String busiCnt;
    private String party;

    public String getFinishTime() {
        return finishTime;
    }

    public void setFinishTime(String finishTime) {
        this.finishTime = finishTime;
    }

    public String getBusiCnt() {
        return busiCnt;
    }

    public void setBusiCnt(String busiCnt) {
        this.busiCnt = busiCnt;
    }

    public String getParty() {
        return party;
    }

    public void setParty(String party) {
        this.party = party;
    }
}

2、定義list實體

public class WzwScreenChildEntity {
    public String getFinishTime() {
        return finishTime;
    }

    public void setFinishTime(String finishTime) {
        this.finishTime = finishTime;
    }

    public String getBusiCnt() {
        return busiCnt;
    }

    public void setBusiCnt(String busiCnt) {
        this.busiCnt = busiCnt;
    }

    private String finishTime;
    private String busiCnt;
}

3、具體實現

List<WzwScreenEntity> scList = new ArrayList<>();
scList  = mapper.queryData();//從數據庫獲取數據
Map<String, List> map = new HashMap<>();//定義返回的map

if (scList.size() != 0) {
    for (WzwScreenEntity entity : scList) {
        WzwScreenChildEntity childEntity = new WzwScreenChildEntity();
        childEntity.setFinishTime(entity.getFinishTime());
        childEntity.setBusiCnt(entity.getBusiCnt());

        List<WzwScreenChildEntity> list = new ArrayList<>();
        list.add(childEntity);

		//當map中的key相同的，防止value值被覆蓋。
        if (map.containsKey(entity.getParty())) {
            list.addAll(map.get(entity.getParty()));
            map.put(entity.getParty(), list);
        } else {
            map.put(entity.getParty(), list);
        }
    }
}
LOGGER.info("map================== " + map);