 /**

  * tree

  */

 @RequestMapping(value = "/tree.do")

 public void mytree(HttpServletResponse response, String id) {

  this.writeJson(response, bookService.getChildrenTree(id));

 }

Service層 :

復(fù)制代碼代碼如下:

 @Transactional

 @Override

 public List<Tree> getChildrenTree(String pid) {

  try {

   List<Tree> result = new ArrayList<Tree>();

   //獲得兒子節(jié)點(diǎn)的列表

   List<TBookType> childrenList = this.getChildrenType(pid);

   if (childrenList != null && childrenList.size() > 0) {

    for (TBookType child : childrenList) {

     // 獲取孫子的個數(shù)

     long count = bookDao.getChildrenCount(String.valueOf(child.getId()));

     Tree node = new Tree();

     node.setId(String.valueOf(child.getId()));

     node.setPid(String.valueOf(child.getPid()));

     node.setText(child.getName());

     node.setChildren(null);

     node.setState(count > 0 ? "closed" : "open");

     //將兒子列表childrenList數(shù)據(jù)逐個存到樹當(dāng)中

     result.add(node);

    }

   }

    return result; 

  } catch (Exception e) {

   throw new BusinessException("獲取圖書類型數(shù)據(jù)出現(xiàn)錯誤！", e);

  }

 }

Dao層 :

復(fù)制代碼代碼如下:

 @Override

 public List<TBookType> getChildrenType(String pid) {

 //這個的pid就是當(dāng)前展開節(jié)點(diǎn)的id , 通過父節(jié)點(diǎn)的 id 來獲得子節(jié)點(diǎn)

 StringBuilder sqlstr = new StringBuilder();

  if (StringUtils.isBlank(pid))

   sqlstr.append("select * from booktype bt where bt.pid=0");

  else

   sqlstr.append("select * from booktype bt where bt.pid=" + pid );

  return this.search2(TBookType.class, sqlstr.toString());

 }

復(fù)制代碼代碼如下:

 @Override

 public long getChildrenCount(String pid) {

 //這個的pid就是當(dāng)前展開節(jié)點(diǎn)的id , 通過父節(jié)點(diǎn)的 id 來獲得子節(jié)點(diǎn)的個數(shù)

  StringBuilder sqlstr = new StringBuilder();

  if (StringUtils.isBlank(pid))

   sqlstr.append("select count(*) from booktype tb where tb.pid='0'");

  else

   sqlstr.append("select count(*) from booktype tb where tb.pid='" + pid + "'");

  return this.count(sqlstr.toString());

 }

以上所述就是本文關(guān)于EasyUI實(shí)現(xiàn)異步樹的全部代碼了，希望對大家能有所幫助

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