java 树形对象工具类封装

1、ztree用于前台树形结构显示需要json数据

基础的树形对象：

import java.io.Serializable;
import java.util.List;
 
/**
 * treegrid树形表格基础对象，后续的该类型的对象均继承该对象
 *
 */
public class BaseTreeGrid implements Serializable{
 
	/**
	 * 
	 */
	private static final long serialVersionUID = -9189631784252440402L;
	
	public String id;//节点id
	
	public String parentId;//节点父id
	
	public String iconCls = "folder";//节点样式，默认即可
	
	public Boolean leaf = true;//是否为叶子节点，true表示是叶子节点，false表示不是叶子节点
	
	public Boolean expanded = true; //是否展开，默认true,展开
	
	public List children;//孩子节点
 
 
	public BaseTreeGrid() {
		
	}
	
	public BaseTreeGrid(String id, String parentId) {
		this.id=id;
		this.parentId=parentId;
	}
 
	public String getId() {
		return id;
	}
 
	public void setId(String id) {
		this.id = id;
	}
 
	public String getParentId() {
		return parentId;
	}
 
	public void setParentId(String parentId) {
		this.parentId = parentId;
	}
 
	public String getIconCls() {
		return iconCls;
	}
 
	public void setIconCls(String iconCls) {
		this.iconCls = iconCls;
	}
 
	public Boolean getLeaf() {
		return leaf;
	}
 
	public void setLeaf(Boolean leaf) {
		this.leaf = leaf;
	}
 
	public Boolean getExpanded() {
		return expanded;
	}
 
	public void setExpanded(Boolean expanded) {
		this.expanded = expanded;
	}
 
	public List getChildren() {
		return children;
	}
 
	public void setChildren(List children) {
		this.children = children;
	}
}

2、测试类

import java.util.ArrayList;
import java.util.List;
 
import com.alibaba.fastjson.JSONArray;
import com.eshore.common.ext.BaseTreeGrid;
 
/**
 * 将记录list转化为树形list
 * 基于BaseTreeGid类的转换
 *
 */
public class TreeUtils {
 
	/**
	 * 格式化list为树形list
	 * @param list
	 * @param falg true 表示全部展开，其他 表示不展开
	 * @return
	 */
	public static  List formatTree(List list, Boolean flag) {
 
		List nodeList = new ArrayList();  
		for(T node1 : list){  
		    boolean mark = false;  
		    for(T node2 : list){  
		        if(node1.getParentId()!=null && node1.getParentId().equals(node2.getId())){ 
		        	node2.setLeaf(false);
		            mark = true;  
		            if(node2.getChildren() == null) {
		            	node2.setChildren(new ArrayList());  
		            }
		            node2.getChildren().add(node1); 
		            if (flag) {
		            	//默认已经全部展开
		            } else{
		            	node2.setExpanded(false);
		            }
		            break;  
		        }  
		    }  
		    if(!mark){  
		        nodeList.add(node1);   
		        if (flag) {
	            	//默认已经全部展开
	            } else{
	            	node1.setExpanded(false);
	            }
		    }  
		}
		return nodeList;
	}
	
	public static void main(String[] args) {
		List list = new ArrayList();
		BaseTreeGrid root1 = new BaseTreeGrid();
		root1.setId("1");
		BaseTreeGrid child1 = new BaseTreeGrid();
		child1.setId("11");
		child1.setParentId("1");
		BaseTreeGrid child11 = new BaseTreeGrid();
		child11.setId("111");
		child11.setParentId("11");
		BaseTreeGrid root2 = new BaseTreeGrid();
		root2.setId("2");
		BaseTreeGrid child2 = new BaseTreeGrid();
		child2.setId("21");
		child2.setParentId("2");
		list.add(root1);
		list.add(child1);
		list.add(child11);
		list.add(root2);
		list.add(child2);
		List treelist = formatTree(list, false);
		String json = JSONArray.toJSONString(treelist);
		System.out.println(json);
	}
	
}

3、树结构  递归查询出给定节点的所有子孙节点

package com.ps.uzkefu.apps.knowledge.service.impl;

import com.baomidou.mybatisplus.mapper.EntityWrapper;
import com.ps.uzkefu.apps.knowledge.entity.QuickReply;
import com.ps.uzkefu.apps.knowledge.entity.QuickType;
import com.ps.uzkefu.apps.knowledge.mapper.QuickTypeDao;
import com.ps.uzkefu.apps.knowledge.service.QuickReplyService;
import com.ps.uzkefu.apps.knowledge.service.QuickTypeService;
import com.ps.uzkefu.base.BaseServiceImpl;
import com.ps.uzkefu.common.Result;
import com.ps.uzkefu.util.TreeNode;
import com.ps.uzkefu.util.TreeUtils;
import org.apache.commons.lang.StringUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;

/**
 * 

 * 知识库快捷回复类型 服务实现类
 * 
 *
 * @author WuZhiWei
 * @since 2018-07-06
 */
@Service
public class QuickTypeServiceImpl extends BaseServiceImpl implements QuickTypeService {

    @Autowired
    QuickReplyService quickReplyService;
    @Override
    public List getQuickTypeTree(QuickType quickType) {
        EntityWrapper entityWrapper = new EntityWrapper<>();
        if (StringUtils.isNotBlank(quickType.getId())){
            entityWrapper.eq("parentid",quickType.getId());
        }
        entityWrapper.eq("corp_code",quickType.getCorpCode()).orderBy("order_num");
        List quickTypes = this.selectList(entityWrapper);
        List treeNodes = new ArrayList<>();
        TreeNode treeNode = null;
        for (QuickType q:quickTypes) {
            treeNode = new TreeNode();
            treeNode.setpId(q.getParentid());
            treeNode.setId(q.getId());
            treeNode.setName(q.getName());
            treeNode.setOpen("true");
            treeNode.setOrderNum(q.getOrderNum());
            treeNodes.add(treeNode);

        }
        List trees = TreeUtils.formatTree(treeNodes,true);
        Collections.sort(trees,new Comparator() {
            @Override
            public int compare(TreeNode o1, TreeNode o2) {
                // 返回值为int类型，大于0表示正序，小于0表示逆序
                return o1.getOrderNum()-o2.getOrderNum();
            }
        });
        return trees;
    }

    @Override
    public Result deleteQuickTypeById(String typeid) {
        EntityWrapper entityWrapper = new EntityWrapper<>();
        entityWrapper.eq("id",typeid).or("parentid",typeid);

        boolean result = this.delete(entityWrapper);
        if (result){
            EntityWrapper wrapper = new EntityWrapper<>();
//            todo 递归删除

        }else {

        }
        return null;
    }

    @Override
    public List getAllParent(QuickType quickType) {
        return this.baseMapper.selectAllParent(quickType.getCorpCode());
    }

    @Override
    public List getAllChild(String typeid,String corpcode) {
        QuickType quickType = new QuickType();
        quickType.setCorpCode(corpcode);
        List quickTypes = new ArrayList<>();
        quickTypes = getTreeList(quickTypes,typeid);
        List ids = new ArrayList<>();
        for (QuickType node:quickTypes) {
          ids.add(node.getId());
        }
        return ids;

    }

    /**
     * 递归查询给定节点id的所有子孙节点
     * @param domainList
     * @param pid
     * @return
     */
   @Override
    public List getTreeList(List domainList ,String pid) {
        //加入它本身
        QuickType model = new QuickType();
        model.setId(pid);
        domainList.add(model);
        //加入子集
        QuickType domainType = new QuickType();
        domainType.setParentid(pid);
        List list = selectList(new EntityWrapper().eq("parentid",pid));
        for(QuickType type : list) {
            getTreeList(domainList,type.getId());
        }
        return domainList;
    }


}