java中Map ListE的用法

返回的restful接口数据样式：

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

1、定义WzwScreenEntity 实体

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、定义list实体

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、具体实现

List<WzwScreenEntity> scList = new ArrayList<>(); scList = mapper.queryData();//从数据库获取数据 Map<String, List> map = new HashMap<>();//定义返回的mapif (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);//当map中的key相同的，防止value值被覆盖。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);

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