java 返回树结构

RegionBeanTree beanTree2 = new RegionBeanTree();
       beanTree2.setCode("2");
       beanTree2.setLable("端口开放异常");
       beanTree2.setPid("0");
       RegionBeanTree beanTree3 = new RegionBeanTree();
       beanTree3.setCode("3");
       beanTree3.setLable("进程数量异常");
       beanTree3.setPid("0");
       RegionBeanTree beanTree4 = new RegionBeanTree();
       beanTree4.setCode("4");
       beanTree4.setLable("进程名称异常");
       beanTree4.setPid("0");
       RegionBeanTree beanTree5 = new RegionBeanTree();
       beanTree5.setCode("5");
       beanTree5.setLable("其他");
       beanTree5.setPid("0");
       RegionBeanTree beanTree51 = new RegionBeanTree();
       beanTree51.setCode("51");
       beanTree51.setLable("其他1");
       beanTree51.setPid("5");
       List<RegionBeanTree> childrenNodeList = new ArrayList<>();
       childrenNodeList.add(beanTree51);
       beanTree5.setChildren(childrenNodeList);

       List<RegionBeanTree> rootNodeList = new ArrayList<>();
       rootNodeList.add(beanTree2);
       rootNodeList.add(beanTree3);
       rootNodeList.add(beanTree4);
       rootNodeList.add(beanTree5);

       System.out.println(JsonUtils.toJson(rootNodeList));

第二种

RegionBeanTree beanTree2 = new RegionBeanTree();
     beanTree2.setCode("2");
     beanTree2.setLable("端口开放异常");
     beanTree2.setPid("0");
     RegionBeanTree beanTree3 = new RegionBeanTree();
     beanTree3.setCode("3");
     beanTree3.setLable("进程数量异常");
     beanTree3.setPid("0");
     RegionBeanTree beanTree4 = new RegionBeanTree();
     beanTree4.setCode("4");
     beanTree4.setLable("进程名称异常");
     beanTree4.setPid("0");
     RegionBeanTree beanTree5 = new RegionBeanTree();
     beanTree5.setCode("5");
     beanTree5.setLable("其他");
     beanTree5.setPid("0");
     RegionBeanTree beanTree51 = new RegionBeanTree();
     beanTree5.setCode("51");
     beanTree5.setLable("其他1");
     beanTree5.setPid("5");
     RegionBeanTree beanTree6 = new RegionBeanTree();
     List<RegionBeanTree> rootList = new ArrayList<>();
     rootList.add(beanTree2);
     rootList.add(beanTree3);
     rootList.add(beanTree4);
     rootList.add(beanTree5);
     List<RegionBeanTree> bodyList = new ArrayList<>();
     bodyList.add(beanTree2);
     bodyList.add(beanTree3);
     bodyList.add(beanTree4);
     bodyList.add(beanTree5);
     
     for (int i = 0; i < list.size(); i++) {
         Map<String, String> map = list.get(i);

                 if("1".equals(map.get("type"))){
                     RegionBeanTree beanTemp = new RegionBeanTree();
                     beanTemp.setCode(map.get("ruleId"));
                     beanTemp.setLable(map.get("ruleName"));
                     beanTemp.setPid("1");
                     bodyList.add(beanTemp);
                 }else if("2".equals(map.get("type"))){
                     RegionBeanTree beanTemp = new RegionBeanTree();
                     beanTemp.setCode(map.get("ruleId"));
                     beanTemp.setLable(map.get("ruleName"));
                     beanTemp.setPid("2");
                     bodyList.add(beanTemp);
         }else if("3".equals(map.get("type"))){
             RegionBeanTree beanTemp = new RegionBeanTree();
                     beanTemp.setCode(map.get("ruleId"));
                     beanTemp.setLable(map.get("ruleName"));
                     beanTemp.setPid("3");
             bodyList.add(beanTemp);
         }else if("4".equals(map.get("type"))){
             RegionBeanTree beanTemp = new RegionBeanTree();
                     beanTemp.setCode(map.get("ruleId"));
                     beanTemp.setLable(map.get("ruleName"));
                     beanTemp.setPid("4");
             bodyList.add(beanTemp);
         }
     }
     TreeBuilder utils = new TreeBuilder(rootList, bodyList);
     return utils.getTree();

tree类

public class RegionBeanTree {
    private String code;
    private String lable;
    private String pid;
    private List<RegionBeanTree> children;



    public String getCode() {
        return code;
    }

    public void setCode(String code) {
        this.code = code;
    }

    public String getLable() {
        return lable;
    }

    public void setLable(String lable) {
        this.lable = lable;
    }

    public String getPid() {
        return pid;
    }

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

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

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