springmvc+mybatis 无极限树形结构菜单(第一种)

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MYSQL数据库:

查出数据调用封装类:

  List<Menu> menulist = new ArrayList<Menu>();      menulist = menuService.menuList();      MenuTree menuTree = new MenuTree();      System.out.println(menuTree.menuList(menulist));

树形结构封装类：

package com.sdmc.util;    import java.util.ArrayList;  import java.util.LinkedHashMap;  import java.util.List;  import java.util.Map;  import com.sdmc.bean.Menu;    public class MenuTree {               public static Map<String,Object> mapArray = new LinkedHashMap<String, Object>();      public List<Menu> menuCommon;      public List<Object> list = new ArrayList<Object>();            public List<Object> menuList(List<Menu> menu){              this.menuCommon = menu;          for (Menu x : menu) {                 Map<String,Object> mapArr = new LinkedHashMap<String, Object>();              if(x.getPid()==0){                  mapArr.put("id", x.getId());                  mapArr.put("name", x.getName());                  mapArr.put("level", x.getLevel());                  mapArr.put("pid", x.getPid());                    mapArr.put("child", menuChild(x.getId()));                    list.add(mapArr);              }          }             return list;      }              public List<?> menuChild(int id){          List<Object> lists = new ArrayList<Object>();          for(Menu a:menuCommon){              Map<String,Object> childArray = new LinkedHashMap<String, Object>();              if(a.getPid() == id){                  childArray.put("id", a.getId());                  childArray.put("name", a.getName());                  childArray.put("level", a.getLevel());                  childArray.put("pid", a.getPid());                  childArray.put("child", menuChild(a.getId()));                    lists.add(childArray);              }          }          return lists;            }  }

结果:

[{id=1, name=内容管理, level=1, pid=0,       child=[{id=6, name=栏目管理, level=2, pid=1,           child=[{id=17, name=管理内容, level=3, pid=6,               child=[{id=11, name=业务管理, level=4, pid=17, child=[]}]}]},             {id=7, name=模型管理, level=2, pid=1, child=[]}]},   {id=2, name=用户管理, level=1, pid=0, child=[{id=10, name=会员管理, level=2, pid=2, child=[]}]}  ]

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