list集合生成树

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    @Test
   public void selectbranchtree(){
       ApplicationContext actx = new ClassPathXmlApplicationContext("classpath:spring/applicationContext-dao.xml");
       FyBranchMapper mapper = actx.getBean(FyBranchMapper.class);


       List<BranchTree> list = mapper.selectbranchtree();

       System.out.println(list);
       System.out.println(list.get(0).getBbLevel());
       List<BranchTree> children = createTree(list);
       System.out.println(children);
   }

   public List<BranchTree> createTree(List<BranchTree> list) {
       List<BranchTree> children = new ArrayList<BranchTree>();
       // 当等级最高时，停止排序
           for (BranchTree node : list) {
               if ("0".equals(node.getBbLevel())) {

                   initChildren(node, list);

                   children.add(node);
               }
           }
           return children;
   }
   public static void initChildren(BranchTree treeNode, List<BranchTree> list) {
       List<BranchTree> children = new ArrayList<BranchTree>();
       // 当等级最高时，停止排序
           // 将最低级别的放到数组中
           for (BranchTree node : list) {
               int parentId = treeNode.getBbId();
               if (parentId == node.getBbParentid()){

                   initChildren(node, list);

                   children.add(node);
               }
           }
           treeNode.setChildren(children);
   }

}

结果：

[BranchTree [bbId=1, bbParentid=0, bbName=总部, bbLevel=0, children=[]], BranchTree [bbId=2, bbParentid=1, bbName=区域, bbLevel=1, children=[]], BranchTree [bbId=3, bbParentid=2, bbName=中心路店, bbLevel=1, children=[]], BranchTree [bbId=4, bbParentid=2, bbName=共和新路店, bbLevel=3, children=[]], BranchTree [bbId=5, bbParentid=1, bbName=财务, bbLevel=2, children=[]], BranchTree [bbId=6, bbParentid=1, bbName=开发, bbLevel=3, children=[]]]
0
[BranchTree [bbId=1, bbParentid=0, bbName=总部, bbLevel=0, children=[BranchTree [bbId=2, bbParentid=1, bbName=区域, bbLevel=1, children=[BranchTree [bbId=3, bbParentid=2, bbName=中心路店, bbLevel=1, children=[]], BranchTree [bbId=4, bbParentid=2, bbName=共和新路店, bbLevel=3, children=[]]]], BranchTree [bbId=5, bbParentid=1, bbName=财务, bbLevel=2, children=[]], BranchTree [bbId=6, bbParentid=1, bbName=开发, bbLevel=3, children=[]]]]]

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