查询部门----返回给前台TreeView数据格式的数据

实体类：

public class AddressTreeDto {
    private Long id;
    private String text;//位置名称
    private Long pId;//上一级
    private Integer able;

    private List<AddressTreeDto> nodes;

    public Long getId() {
        return id;
    }

    public void setId(Long id) {
        this.id = id;
    }

    public String getText() {
        return text;
    }

    public void setText(String text) {
        this.text = text;
    }

    public Long getpId() {
        return pId;
    }

    public void setpId(Long pId) {
        this.pId = pId;
    }

    public Integer getAble() {
        return able;
    }

    public void setAble(Integer able) {
        this.able = able;
    }

    public List<AddressTreeDto> getNodes() {
        return nodes;
    }

    public void setNodes(List<AddressTreeDto> nodes) {
        this.nodes = nodes;
    }
}

Service接口：

public interface AddressService {
    //查询所有存放地，返回TreeView数据格式

    List<AddressTreeDto> getAddressTree();
}

ServiceImpl实现类

public class AddressServiceImpl implements AddressService {
    @Autowired
    private AddressMapper addressMapper;
    private List<AddressTreeDto> getChild(Long id, List<AddressTreeDto> rootAddress) {
        // 子菜单
        List<AddressTreeDto> childList = new ArrayList<>();
        for (AddressTreeDto treeDto : rootAddress) {
            // 遍历所有节点，将父菜单id与传过来的id比较
            if (treeDto.getpId()!=null) {
                if (treeDto.getpId().equals(id)) {
                    childList.add(treeDto);
                }
            }
        }
        // 把子菜单的子菜单再循环一遍
        for (AddressTreeDto treeDto: childList) {
            // 没有url子菜单还有子菜单---判断还有子菜单
            if(getIds(treeDto.getId())!=null){
                //递归
                treeDto.setNodes(getChild(treeDto.getId(),rootAddress));
            }
        } // 递归退出条件
        if (childList.size() == 0) {
            return null;
        }
        return childList;
    }
    @Override
    public List<AddressTreeDto> getAddressTree() {
        // 原始的数据
        List<AddressTreeDto> rootAddress = addressMapper.selectTree(Constants.ABLE_CONFIG.DEFAULT_ABLE);
        // 查看结果
        for (AddressTreeDto treeDto1 : rootAddress) {
            System.out.println(treeDto1);
        }
        // 最后的结果
        List<AddressTreeDto> addressList = new ArrayList<>();
        // 先找到所有的一级菜单
        for (int i = 0; i < rootAddress.size(); i++) {
            // 一级菜单没有parentId
            if (rootAddress.get(i).getpId()==0) {
                addressList.add(rootAddress.get(i));
            }
        }
        // 为一级菜单设置子菜单，getChild是递归调用的
        for (AddressTreeDto treeDto1 : addressList) {
            treeDto1.setNodes(getChild(treeDto1.getId(), rootAddress));
        }
        return addressList;

    }

}