tree组件（后端）
工具类及实体类
基于mvc框架
Menu实体类
package com.rong.entity;
public class Menu {
private String menuid;
private String menuname;
private String menuURL;
private String parentid;
public String getMenuid() {
return menuid;
}
public void setMenuid(String menuid) {
this.menuid = menuid;
}
public String getMenuname() {
return menuname;
}
public void setMenuname(String menuname) {
this.menuname = menuname;
}
public String getMenuURL() {
return menuURL;
}
public void setMenuURL(String menuURL) {
this.menuURL = menuURL;
}
public String getParentid() {
return parentid;
}
public void setParentid(String parentid) {
this.parentid = parentid;
}
public Menu() {
super();
}
public Menu(String menuid, String menuname, String menuURL, String parentid) {
super();
this.menuid = menuid;
this.menuname = menuname;
this.menuURL = menuURL;
this.parentid = parentid;
}
@Override
public String toString() {
return "Menu [menuid=" + menuid + ", menuname=" + menuname + ", menuURL=" + menuURL + ", parentid=" + parentid
+ "]";
}
}
BuildTree工具类
package com.rong.util;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import com.rong.vo.TreeVo;
public class BuildTree {
/**
* 默认-1为顶级节点
* @param nodes
* @param <T>
* @return
*/
public static <T> TreeVo<T> build(List<TreeVo<T>> nodes) {
if (nodes == null) {
return null;
}
List<TreeVo<T>> topNodes = new ArrayList<TreeVo<T>>();
for (TreeVo<T> children : nodes) {
String pid = children.getParentId();
if (pid == null || "-1".equals(pid)) {
topNodes.add(children);
continue;
}
for (TreeVo<T> parent : nodes) {
String id = parent.getId();
if (id != null && id.equals(pid)) {
parent.getChildren().add(children);
children.setHasParent(true);
parent.setChildren(true);
continue;
}
}
}
//问题：数据库没有顶级节点
TreeVo<T> root = new TreeVo<T>();
if (topNodes.size() == 1) {
//有顶级节点
root = topNodes.get(0);
} else {//没有顶级节点
root.setId("000");
root.setParentId("-1");
root.setHasParent(false);
root.setChildren(true);
root.setChecked(true);
root.setChildren(topNodes);
root.setText("顶级节点");
Map<String, Object> state = new HashMap<>(16);
state.put("opened", true);
root.setState(state);
}
return root;
}
/**
* 指定idparam为顶级节点
* @param nodes
* @param idParam
* @param <T>
* @return
*/
public static <T> List<TreeVo<T>> buildList(List<TreeVo<T>> nodes, String idParam) {
if (nodes == null) {
return null;
}
List<TreeVo<T>> topNodes = new ArrayList<TreeVo<T>>();
for (TreeVo<T> children : nodes) {
String pid = children.getParentId();
if (pid == null || idParam.equals(pid)) {
topNodes.add(children);
continue;
}
for (TreeVo<T> parent : nodes) {
String id = parent.getId();
if (id != null && id.equals(pid)) {
parent.getChildren().add(children);
children.setHasParent(true);
parent.setChildren(true);
continue;
}
}
}
return topNodes;
}
}
dao层调用
TreeVo
package com.rong.vo;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
public class TreeVo<T> {
/**
* 节点ID
*/
private String id;
/**
* 显示节点文本
*/
private String text;
/**
* 节点状态，open closed
*/
private Map<String, Object> state;
/**
* 节点是否被选中 true false
*/
private boolean checked = false;
/**
* 节点属性
*/
private Map<String, Object> attributes;
/**
* 节点的子节点
*/
private List<TreeVo<T>> children = new ArrayList<TreeVo<T>>();
/**
* 父ID
*/
private String parentId;
/**
* 是否有父节点
*/
private boolean hasParent = false;
/**
* 是否有子节点
*/
private boolean hasChildren = false;
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public String getText() {
return text;
}
public void setText(String text) {
this.text = text;
}
public Map<String, Object> getState() {
return state;
}
public void setState(Map<String, Object> state) {
this.state = state;
}
public boolean isChecked() {
return checked;
}
public void setChecked(boolean checked) {
this.checked = checked;
}
public Map<String, Object> getAttributes() {
return attributes;
}
public void setAttributes(Map<String, Object> attributes) {
this.attributes = attributes;
}
public List<TreeVo<T>> getChildren() {
return children;
}
public void setChildren(List<TreeVo<T>> children) {
this.children = children;
}
public boolean isHasParent() {
return hasParent;
}
public void setHasParent(boolean isParent) {
this.hasParent = isParent;
}
public boolean isHasChildren() {
return hasChildren;
}
public void setChildren(boolean isChildren) {
this.hasChildren = isChildren;
}
public String getParentId() {
return parentId;
}
public void setParentId(String parentId) {
this.parentId = parentId;
}
public TreeVo(String id, String text, Map<String, Object> state, boolean checked, Map<String, Object> attributes,
List<TreeVo<T>> children, boolean isParent, boolean isChildren, String parentID) {
super();
this.id = id;
this.text = text;
this.state = state;
this.checked = checked;
this.attributes = attributes;
this.children = children;
this.hasParent = isParent;
this.hasChildren = isChildren;
this.parentId = parentID;
}
public TreeVo() {
super();
}
}
助手类
都是些MVC的util类,可看前些天的博客。
dao层
MenuDao
package com.rong.dao;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.rong.entity.Menu;
import com.rong.util.BaseDao;
import com.rong.util.BuildTree;
import com.rong.util.PageBean;
import com.rong.vo.TreeVo;
public class MenuDao extends BaseDao<Menu>{
public List<Menu> list(Menu menu,PageBean pagebean) throws InstantiationException, IllegalAccessException, SQLException{
String sql="select * from t_easyui_menu";
return super.executeQuery(sql, Menu.class, pagebean);
}
public TreeVo<Menu> topNode(Menu menu,PageBean pagebean) throws InstantiationException, IllegalAccessException, SQLException{
List<Menu> list=this.list(menu, pagebean);
//通过工具类完成指定格式输出
List<TreeVo<Menu>> nodes=new ArrayList<TreeVo<Menu>>();
//将List<T>转换成List<TreeVo<T>>
TreeVo treeVo=null;
for (Menu m: list) {
treeVo=new TreeVo<>();
treeVo.setId(m.getMenuid()+"");
treeVo.setText(m.getMenuname());
treeVo.setParentId(m.getParentid()+"");
Map<String, Object> attributes=new HashMap<String, Object>();
treeVo.setAttributes(attributes);
nodes.add(treeVo);
}
return BuildTree.build(nodes);
}
public static void main(String[] args) throws InstantiationException, IllegalAccessException, SQLException, JsonProcessingException {
MenuDao pdao=new MenuDao();
List<Menu> list=pdao.list(null, null);
//通过工具类完成指定格式输出
List<TreeVo<Menu>> nodes=new ArrayList<TreeVo<Menu>>();
//将List<T>转换成List<TreeVo<T>>
TreeVo treeVo=null;
for (Menu m: list) {
treeVo=new TreeVo<>();
treeVo.setId(m.getMenuid()+"");
treeVo.setText(m.getMenuname());
treeVo.setParentId(m.getParentid()+"");
Map<String, Object> attributes=new HashMap<String, Object>();
treeVo.setAttributes(attributes);
nodes.add(treeVo);
}
TreeVo<Menu> parent=BuildTree.build(nodes);
ObjectMapper om=new ObjectMapper();
String jsonstr=om.writeValueAsString(parent);
System.out.println(jsonstr);
}
}
MenuDao运行测试
看到这样一串字符串就获取到了数据库值
{"id":"000","text":"菜单管理","state":null,"checked":false,"attributes":{},"children":[{"id":"004","text":"统一配置","state":null,"checked":false,"attributes":{},"children":[{"id":"004004","text":"人员管理","state":null,"checked":false,"attributes":{},"children":[{"id":"004004001","text":"角色维护","state":null,"checked":false,"attributes":{},"children":[],"parentId":"004004","hasParent":true,"hasChildren":false},{"id":"004004004","text":"权限信息维护","state":null,"checked":false,"attributes":{},"children":[],"parentId":"004004","hasParent":true,"hasChildren":false},{"id":"004004003","text":"人员信息维护","state":null,"checked":false,"attributes":{},"children":[],"parentId":"004004","hasParent":true,"hasChildren":false},{"id":"004004002","text":"工作组维护","state":null,"checked":false,"attributes":{},"children":[],"parentId":"004004","hasParent":true,"hasChildren":false}],"parentId":"004","hasParent":true,"hasChildren":true},{"id":"004001","text":"数据字典","state":null,"checked":false,"attributes":{},"children":[],"parentId":"004","hasParent":true,"hasChildren":false},{"id":"004003","text":"权限管理","state":null,"checked":false,"attributes":{},"children":[{"id":"004003003","text":"用户权限管理","state":null,"checked":false,"attributes":{},"children":[],"parentId":"004003","hasParent":true,"hasChildren":false},{"id":"004003002","text":"组权限管理","state":null,"checked":false,"attributes":{},"children":[],"parentId":"004003","hasParent":true,"hasChildren":false},{"id":"004003001","text":"角色权限管理","state":null,"checked":false,"attributes":{},"children":[],"parentId":"004003","hasParent":true,"hasChildren":false}],"parentId":"004","hasParent":true,"hasChildren":true},{"id":"004002","text":"系统参数配置","state":null,"checked":false,"attributes":{},"children":[],"parentId":"004","hasParent":true,"hasChildren":false}],"parentId":"000","hasParent":true,"hasChildren":true},{"id":"002","text":"后勤管理","state":null,"checked":false,"attributes":{},"children":[{"id":"002004","text":"宿舍日常报销","state":null,"checked":false,"attributes":{},"children":[{"id":"002004002","text":"大件购置","state":null,"checked":false,"attributes":{},"children":[],"parentId":"002004","hasParent":true,"hasChildren":false},{"id":"002004001","text":"维修","state":null,"checked":false,"attributes":{},"children":[],"parentId":"002004","hasParent":true,"hasChildren":false}],"parentId":"002","hasParent":true,"hasChildren":true},{"id":"002001","text":"宿舍管理","state":null,"checked":false,"attributes":{},"children":[],"parentId":"002","hasParent":true,"hasChildren":false},{"id":"002005","text":"后勤统计","state":null,"checked":false,"attributes":{},"children":[],"parentId":"002","hasParent":true,"hasChildren":false},{"id":"002002","text":"水电费","state":null,"checked":false,"attributes":{},"children":[],"parentId":"002","hasParent":true,"hasChildren":false},{"id":"002003","text":"房屋租金","state":null,"checked":false,"attributes":{},"children":[{"id":"002003002","text":"租金信息","state":null,"checked":false,"attributes":{},"children":[],"parentId":"002003","hasParent":true,"hasChildren":false},{"id":"002003001","text":"租房合同","state":null,"checked":false,"attributes":{},"children":[],"parentId":"002003","hasParent":true,"hasChildren":false}],"parentId":"002","hasParent":true,"hasChildren":true}],"parentId":"000","hasParent":true,"hasChildren":true},{"id":"003","text":"财务","state":null,"checked":false,"attributes":{},"children":[{"id":"003003","text":"住宿费","state":null,"checked":false,"attributes":{},"children":[{"id":"003003002","text":"水电费","state":null,"checked":false,"attributes":{},"children":[],"parentId":"003003","hasParent":true,"hasChildren":false},{"id":"003003001","text":"租金","state":null,"checked":false,"attributes":{},"children":[],"parentId":"003003","hasParent":true,"hasChildren":false}],"parentId":"003","hasParent":true,"hasChildren":true},{"id":"003002","text":"成考费","state":null,"checked":false,"attributes":{},"children":[],"parentId":"003","hasParent":true,"hasChildren":false},{"id":"003001","text":"学费","state":null,"checked":false,"attributes":{},"children":[{"id":"003001002","text":"升学学费","state":null,"checked":false,"attributes":{},"children":[],"parentId":"003001","hasParent":true,"hasChildren":false},{"id":"003001001","text":"开学学费","state":null,"checked":false,"attributes":{},"children":[],"parentId":"003001","hasParent":true,"hasChildren":false}],"parentId":"003","hasParent":true,"hasChildren":true}],"parentId":"000","hasParent":true,"hasChildren":true},{"id":"001","text":"学生管理","state":null,"checked":false,"attributes":{},"children":[{"id":"001005","text":"就业信息","state":null,"checked":false,"attributes":{},"children":[],"parentId":"001","hasParent":true,"hasChildren":false},{"id":"001003","text":"缴费信息","state":null,"checked":false,"attributes":{},"children":[],"parentId":"001","hasParent":true,"hasChildren":false},{"id":"001001","text":"学生相关信息","state":null,"checked":false,"attributes":{},"children":[],"parentId":"001","hasParent":true,"hasChildren":false},{"id":"001004","text":"表现相关信息","state":null,"checked":false,"attributes":{},"children":[],"parentId":"001","hasParent":true,"hasChildren":false},{"id":"001002","text":"班级相关信息","state":null,"checked":false,"attributes":{},"children":[],"parentId":"001","hasParent":true,"hasChildren":false}],"parentId":"000","hasParent":true,"hasChildren":true}],"parentId":"-1","hasParent":false,"hasChildren":true}