查询菜单列表 封装成javaBean,并生成树形结构json字符串返回给前端

数据库设计

实体类

package com.heeexy.example.entity;

import com.alibaba.fastjson.annotation.JSONField;

import java.util.ArrayList;
import java.util.List;

//菜单实体类
public class Menu {
    private String id;
    private String pid;
    private String path;
    private String redirect;
    private String name;
    private String component;
    private Boolean alwaysShow;
    private String menu;

    //菜单标识
    private Meta meta;

    //子菜单
    private List<Menu> children;

    public Menu(String id, String pid, String path, String redirect, String name, String component, Boolean alwaysShow, String menu, Meta meta) {
        this.id = id;
        this.pid = pid;
        this.path = path;
        this.redirect = redirect;
        this.name = name;
        this.component = component;
        this.alwaysShow = alwaysShow;
        this.menu = menu;
        this.meta = meta;
    }

    public Menu(){

    }

    //@JSONField(serialize=false)
    public String getId() {
        return id;
    }

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

    //@JSONField(serialize=false)
    public String getPid() {
        return pid;
    }

    public void setPid(String pid) {
        this.pid = pid;
    }

    public String getPath() {
        return path;
    }

    public void setPath(String path) {
        this.path = path;
    }

    public String getRedirect() {
        return redirect;
    }

    public void setRedirect(String redirect) {
        this.redirect = redirect;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getComponent() {
        return component;
    }

    public void setComponent(String component) {
        this.component = component;
    }

    public Boolean getAlwaysShow() {
        return alwaysShow;
    }

    public void setAlwaysShow(Boolean alwaysShow) {
        this.alwaysShow = alwaysShow;
    }

    public String getMenu() {
        return menu;
    }

    public void setMenu(String menu) {
        this.menu = menu;
    }

    public Meta getMeta() {
        return meta;
    }

    public void setMeta(Meta meta) {
        this.meta = meta;
    }

    public List<Menu> getChildren() {
        return children;
    }

    public void setChildren(List<Menu> children) {
        this.children = children;
    }

    @Override
    public String toString() {
        return "Menu{" +
                "id='" + id + '\'' +
                ", pid='" + pid + '\'' +
                ", path='" + path + '\'' +
                ", redirect='" + redirect + '\'' +
                ", name='" + name + '\'' +
                ", component='" + component + '\'' +
                ", alwaysShow=" + alwaysShow +
                ", menu='" + menu + '\'' +
                ", meta=" + meta +
                ", children=" + children +
                '}';
    }
}

package com.heeexy.example.entity;

//菜单标识
public class Meta {
    private String title;
    private String icon;



    public String getTitle() {
        return title;
    }

    public void setTitle(String title) {
        this.title = title;
    }

    public String getIcon() {
        return icon;
    }

    public void setIcon(String icon) {
        this.icon = icon;
    }

    @Override
    public String toString() {
        return "Meta{" +
                "title='" + title + '\'' +
                ", icon='" + icon + '\'' +
                '}';
    }

    public Meta(String title, String icon) {
        this.title = title;
        this.icon = icon;
    }
}

controller方法

package com.heeexy.example.controller;

import com.alibaba.fastjson.JSONObject;
import com.heeexy.example.service.MenuService;
import com.heeexy.example.util.CommonUtil;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import javax.servlet.http.HttpServletRequest;

//菜单controller
@RestController
@RequestMapping("/menu")
public class MenuController {

    @Autowired
    private MenuService menuService;

    @PostMapping("getInfo")
    public JSONObject getInfo(HttpServletRequest request){
        JSONObject jsonObject = CommonUtil.request2Json(request);
        JSONObject returnData =  menuService.getInfo(jsonObject);
        System.out.println(returnData);
        return returnData;
    }

    @PostMapping("getInfo2")
    public JSONObject getInfo2(@RequestBody JSONObject jsonObject){
        System.out.println(jsonObject);
        return CommonUtil.successJson();
    }
}

service方法

package com.heeexy.example.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.alibaba.fastjson.serializer.SerializerFeature;
import com.heeexy.example.dao.MenuDao;
import com.heeexy.example.entity.Menu;
import com.heeexy.example.entity.Meta;
import com.heeexy.example.util.TreeUtil;
import com.heeexy.example.service.MenuService;
import com.heeexy.example.util.CommonUtil;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.ArrayList;
import java.util.List;

@Service
public class MenuServiceImpl implements MenuService{

    private static org.apache.log4j.Logger logger = org.apache.log4j.Logger.getLogger(MenuService.class);

    @Autowired
    private MenuDao menuDao;

    @Override
    //查询所有菜单列表
    public JSONObject getInfo(JSONObject jsonObject) {
        JSONObject returnData = new JSONObject();

        List<JSONObject> jsonlist = menuDao.getInfo(jsonObject);

        //定义list集合,存储从数据库查询出的所有记录
        List<Menu> menuList = new ArrayList<Menu>();

        // String id, String pid, String path, String redirect, String name, String component, Boolean alwaysShow, String menu
        //遍历集合
        for (JSONObject json:jsonlist){
            //手动封装Menu实体类对象
            Menu menu = new Menu(
                    json.getString("id"),
                    json.getString("pid"),
                    json.getString("path"),
                    json.getString("redirect"),
                    json.getString("name"),
                    json.getString("component"),
                    json.getBoolean("alwaysShow"),
                    json.getString("menu"),
                    new Meta(json.getString("title"),json.getString("icon"))
            );
            //添加每个实体类对象到list集合
            menuList.add(menu);
        }

        //调用TreeTest工具类方法生成树形结构的List集合
        List<Menu> treeList = TreeUtil.listToTree(menuList);

        //使用fastjson对树形list件序列化转成json字符串,过滤掉属性值为null的属性
        String message = JSON.toJSONString(treeList,SerializerFeature.PrettyFormat);

        //重新将json字符串转成jsonObject对象,返回给前端
        returnData.put("message",JSON.parse(message));
        return CommonUtil.successJson(returnData);
    }
}

TreeUtil工具类

package com.heeexy.example.util;

import com.heeexy.example.entity.Menu;

import java.util.ArrayList;
import java.util.List;

//用List构建带有层次结构的json数据
//List父子节点构造树形Json
public class TreeUtil {
    //将list集合转成树形结构的list集合
    public static List<Menu> listToTree(List<Menu> list) {
        //用递归找子。
        List<Menu> treeList = new ArrayList<Menu>();
        for (Menu tree : list) {
            if (tree.getPid().equals("0")) {
                treeList.add(findChildren(tree, list));
            }
        }
        return treeList;
    }

    //寻找子节点
    private static Menu findChildren(Menu tree, List<Menu> list) {
        for (Menu node : list) {
            if (node.getPid().equals(tree.getId())) {
                if (tree.getChildren() == null) {
                    tree.setChildren(new ArrayList<Menu>());
                }
                tree.getChildren().add(findChildren(node, list));
            }
        }
        return tree;
    }

}

数据库中查询出的记录,封装成javabean的结果集

Menu{id='1', pid='0', path='/system', redirect='noredirect', name='功能模块', component='Layout', alwaysShow=true, menu='null', meta=Meta{title='功能模块', icon='tree'}, children=null}
Menu{id='2', pid='1', path='article', redirect='null', name='文章', component='article/article', alwaysShow=null, menu='null', meta=Meta{title='文章', icon='example'}, children=null}
Menu{id='3', pid='0', path='/manage', redirect='noredirect', name='系统管理', component='Layout', alwaysShow=true, menu='null', meta=Meta{title='系统管理', icon='table'}, children=null}
Menu{id='4', pid='3', path='user', redirect='null', name='用户列表', component='user/user', alwaysShow=null, menu='null', meta=Meta{title='用户列表', icon='user'}, children=null}
Menu{id='5', pid='3', path='role', redirect='null', name='权限管理', component='user/role', alwaysShow=null, menu='null', meta=Meta{title='权限管理', icon='password'}, children=null}
Menu{id='6', pid='3', path='test', redirect='null', name='测试', component='test/test', alwaysShow=null, menu='null', meta=Meta{title='测试', icon='test'}, children=null}
{"returnCode":"100","returnMsg":"请求成功","returnData":{"message":[{"redirect":"noredirect","path":"/system","component":"Layout","children":[{"path":"article","component":"article/article","meta":{"icon":"example","title":"文章"},"name":"文章","pid":"1","id":"2"}],"meta":{"icon":"tree","title":"功能模块"},"name":"功能模块","pid":"0","id":"1","alwaysShow":true},{"redirect":"noredirect","path":"/manage","component":"Layout","children":[{"path":"user","component":"user/user","meta":{"icon":"user","title":"用户列表"},"name":"用户列表","pid":"3","id":"4"},{"path":"role","component":"user/role","meta":{"icon":"password","title":"权限管理"},"name":"权限管理","pid":"3","id":"5"},{"path":"test","component":"test/test","meta":{"icon":"test","title":"测试"},"name":"测试","pid":"3","id":"6"}],"meta":{"icon":"table","title":"系统管理"},"name":"系统管理","pid":"0","id":"3","alwaysShow":true}]}}
 

返回给前端的树形json

{
    "returnCode": "100",
    "returnMsg": "请求成功",
    "returnData": {
        "message": [
            {
                "redirect": "noredirect",
                "path": "/system",
                "component": "Layout",
                "children": [
                    {
                        "path": "article",
                        "component": "article/article",
                        "meta": {
                            "icon": "example",
                            "title": "文章"
                        },
                        "name": "文章",
                        "pid": "1",
                        "id": "2"
                    }
                ],
                "meta": {
                    "icon": "tree",
                    "title": "功能模块"
                },
                "name": "功能模块",
                "pid": "0",
                "id": "1",
                "alwaysShow": true
            },
            {
                "redirect": "noredirect",
                "path": "/manage",
                "component": "Layout",
                "children": [
                    {
                        "path": "user",
                        "component": "user/user",
                        "meta": {
                            "icon": "user",
                            "title": "用户列表"
                        },
                        "name": "用户列表",
                        "pid": "3",
                        "id": "4"
                    },
                    {
                        "path": "role",
                        "component": "user/role",
                        "meta": {
                            "icon": "password",
                            "title": "权限管理"
                        },
                        "name": "权限管理",
                        "pid": "3",
                        "id": "5"
                    },
                    {
                        "path": "test",
                        "component": "test/test",
                        "meta": {
                            "icon": "test",
                            "title": "测试"
                        },
                        "name": "测试",
                        "pid": "3",
                        "id": "6"
                    }
                ],
                "meta": {
                    "icon": "table",
                    "title": "系统管理"
                },
                "name": "系统管理",
                "pid": "0",
                "id": "3",
                "alwaysShow": true
            }
        ]
    }
}