/**
* @ClassName: FunctionService
* @Description: 功能菜单
* @author: yaozhenhua
* @date: 2018/12/26 12:29
*/
@Service
public class MenuService {
@Resource
MenuDao menuDao;
/**
*查询可用且上线的菜单
*
* @param
* @author: yaozhenhua 2019/3/27 17:24
*/
public List<MenuVO> listMenu() throws InstantiationException, IllegalAccessException, AobpException {
//结果处理容器
List<MenuVO> menuVOS = new ArrayList<>();
//查询一级菜单
List<MenuBO> menuBOS = menuDao.listParentMenu();
if(!EmptyUtils.isEmpty(menuBOS)){
//一级菜单排序
Collections.sort(menuBOS, new Comparator<MenuBO>() {
@Override
public int compare(MenuBO o1, MenuBO o2) {
int ret = 0;
ret = o1.getParentSequence().compareTo(o2.getParentSequence());
return ret;
}
});
menuVOS = BeanCopyUtils.copyList(menuBOS,MenuVO.class);
for(int i=0; i<menuBOS.size(); i++){
MenuBO menuBO = menuBOS.get(i);
MenuVO menuVO = menuVOS.get(i);
//查询子菜单并排序
List<MenuVO> subMenuVOS = listSubMenu(menuBO.getId(),1);
menuVO.setSubs(subMenuVOS);
}
}
return menuVOS;
}
/**
*根据父id查询子菜单
*
* @param parentId
* @author: yaozhenhua 2019/3/27 17:24
*/
public List<MenuVO> listSubMenu(Long parentId, int alarm) throws InstantiationException, IllegalAccessException, AobpException {
//计数器 递归20次抛出异常,菜单层级最大没有超过20层的。
if(alarm>20){
throw new AobpException(ExceptionConstant.INTERNAL_ERR,"递归次数超过20次异常");
}
//查询出此父菜单下的子菜单
List<MenuBO> menuBOS= menuDao.listMenuByParentId(parentId);
//结果容器
List<MenuVO> menuVOS = new ArrayList<>();
//查看子菜单是不是还有下一级菜单(判定条件 用id作为父id去查 )
if (!EmptyUtils.isEmpty(menuBOS)){
Collections.sort(menuBOS, new Comparator<MenuBO>() {
@Override
public int compare(MenuBO o1, MenuBO o2) {
int ret = 0;
ret = o1.getChildSequence().compareTo(o2.getChildSequence());
return ret;
}
});
menuVOS = BeanCopyUtils.copyList(menuBOS,MenuVO.class);
for (int i = 0; i < menuBOS.size(); i++) {
MenuBO menuBO = menuBOS.get(i);
MenuVO menuVO = menuVOS.get(i);
List<MenuVO> nextMenuVOS = listSubMenu(menuBO.getId(),alarm+1);
if(!EmptyUtils.isEmpty(nextMenuVOS)){
menuVO.setSubs(nextMenuVOS);
}
}
}
return menuVOS;
}
}
另一种方式:
/**
* @ClassName: MenuService
* @author: yaozhenhua
* @date: 2019/3/27 15:59
*/
public class MenuService {
@Transactional(readOnly = true)
public List<Menu> selectDocMenuList() {
// 查询全部文档
List<Menu> rootMenuList = docDao.selectListExpUnable();
// 最终的菜单
List<Menu> docList = new ArrayList<Menu>();
// 没有父ID的文档, 作为一级菜单
for (Menu rootMenu : rootMenuList) {
if (rootMenu.getDocPid() == null) {
docList.add(rootMenu);
}
}
// 为一级菜单添加子菜单
for (Menu menu : docList) {
menu.setChildList(getChild(menu.getDocId(), rootMenuList));
}
if (docList != null && docList.size() > 0) {
// 为list排序
this.mySort(docList, "docOrder", null);
}
return docList;
}
private List<Menu> getChild(String docId, List<Menu> rootMenu) {
if (StringUtils.isBlank(docId)) {
throw new BusinessException("文档id不能为空");
}
// 子菜单
List<Menu> childList = new ArrayList<>();
for (Menu menu : rootMenu) {
// 遍历所有节点,将父菜单id与传过来的type比较
if (menu.getDocPid() != null) {
if (menu.getDocPid().equals(docId)) {
childList.add(menu);
}
}
}
// 把子菜单的子菜单再循环一遍
for (Menu menu : childList) {// 没有内容的子菜单还有子菜单
try {
if (menu.getDocContentHref() != null) {
menu.setDocContent(new String(menu.getDocContentHref(), "UTF-8"));
}
if (StringUtils.isBlank(menu.getDocContent())) {
// 递归
menu.setChildList(getChild(menu.getDocId(), rootMenu));
}
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
} // 递归退出条件
if (childList != null && childList.size() > 0) {
this.mySort(childList, "docOrder", null);
} else {
return null;
}
return childList;
}
}
public class Menu { // 菜单id private String id; // 菜单名称 private String name; // 父菜单id private String parentId; // 菜单url private String url; // 菜单图标 private String icon; // 菜单顺序 private int order; // 子菜单 private List<Menu> children; // ... 省去getter和setter方法以及toString方法 } |
菜单一般需要排序,我们根据Menu的order字段进行排序:
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/* * 排序,根据order排序 */ public Comparator<Menu> order(){ Comparator<Menu> comparator = new Comparator<Menu>() { @Override public int compare(Menu o1, Menu o2) { if (o1.getOrder() != o2.getOrder()){ return o1.getOrder() - o2.getOrder(); } return 0 ; } }; return comparator; } |
生成树的方法:
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public Map<String,Object> findTree(){ Map<String,Object> data = new HashMap<String,Object>(); try { //查询所有菜单 List<Menu> allMenu = menuDao.findTree(); //根节点 List<Menu> rootMenu = new ArrayList<Menu>(); for (Menu nav : allMenu) { if (nav.getParentId().equals( "0" )){ //父节点是0的,为根节点。 rootMenu.add(nav); } } /* 根据Menu类的order排序 */ Collections.sort(rootMenu, order()); //为根菜单设置子菜单,getClild是递归调用的 for (Menu nav : rootMenu) { /* 获取根节点下的所有子节点 使用getChild方法*/ List<Menu> childList = getChild(nav.getId(), allMenu); nav.setChildren(childList);//给根节点设置子节点 } /** * 输出构建好的菜单数据。 * */ data.put( "success" , "true" ); data.put( "list" , rootMenu); return data; } catch (Exception e) { data.put( "success" , "false" ); data.put( "list" , new ArrayList()); return data; } } |
获取子菜单:
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/** * 获取子节点 * @param id 父节点id * @param allMenu 所有菜单列表 * @return 每个根节点下,所有子菜单列表 */ public List<Menu> getChild(String id,List<Menu> allMenu){ //子菜单 List<Menu> childList = new ArrayList<Menu>(); for (Menu nav : allMenu) { // 遍历所有节点,将所有菜单的父id与传过来的根节点的id比较 //相等说明:为该根节点的子节点。 if (nav.ParentId().equals(id)){ childList.add(nav); } } //递归 for (Menu nav : childList) { nav.setChildren(getChild(nav.getId(), allMenu)); } Collections.sort(childList,order()); //排序 //如果节点下没有子节点,返回一个空List(递归退出) if (childList.size() == 0 ){ return new ArrayList<Menu>(); } return childList; } |