环境
使用 springboot + MyBatis-Plus (简化 mybatis 开发) + lombok (注解 gettter、setter)
实体类 Dto
@Data
@TableName("xxx表名")
public class Organize extends Model<Organize> {
@TableId(type = IdType.AUTO)
private String id;
private String code;
private String name;
private String uporgId;
@TableField(exist = false)
private List<Organize> child;
/** 指定主键 */
@Override
protected Serializable pkVal() {
return this.id;
}
}
controlller 省略
service 实现
@Service
public class OrganizeServiceImpl implements OrganizeService {
@Autowired
@SuppressWarnings("all")
private OrganizeMapper organizeMapper;
@Override
public List<Organize> tree(Organize organize) {
long startTime = System.currentTimeMillis();
// 查出全部 获取根节点 list
List<Organize> organizes = organizeMapper.selectList(null);
List<Organize> childList = new ArrayList<Organize>();
for (Organize o : organizes) {
if (StringUtils.isNullOrEmpty(o.getUporgId())) {
childList.add(o);
}
}
// 开始递归
List<Organize> resultTree = setChildren(childList, organizes);
long endTime = System.currentTimeMillis();
//输出程序运行时间
System.out.println("程序运行时间:" + (endTime - startTime) + "ms");
return resultTree;
}
public List<Organize> setChildren(List<Organize> resultTree, List<Organize> allList) {
for (int i = 0; i < resultTree.size(); i++) {
Organize item = resultTree.get(i);
// 从全部数据中查询上级节点为当前节点id 的数据 作为当前节点的子节点
List<Organize> resultChildren = new ArrayList<Organize>();
for (Organize o : allList) {
if (null != o.getUporgId() && o.getUporgId().equals(item.getId())) {
resultChildren.add(o);
}
}
if (!resultChildren.isEmpty()) {
// 递归
resultChildren = setChildren(resultChildren, allList);
// 设置子集
item.setChild(resultChildren);
resultTree.set(i, item);
}
}
return resultTree;
}
}
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