Jquery UI Tree组件的json格式，java递归拼接demo

数据库中表数据，如下图：

实现的需求是，如果suporgcode数据为null 的情况下，表示在一级节点 "请选择" 的二级节点，然后是如：3和36 是1的子节点，一步一步的节点延伸

java代码拼接方式如下：

 /**  * 拼接成json类型  事故类型    * @author 刘仁奎  */     public String createJSONData(String instcode){     // 查询一级节点     String sql="select orgcode,orgname,suporgcode from swe_emerplanorg where instcode='"+instcode+"' and suporgcode is null order by orgcode"; List list=jdbcT.queryForList(sql); StringBuffer json=new StringBuffer("[{\"id\":\"0\",\"text\":\"请选择\",\"children\":[");// 初始化根节点 if(list!=null && list.size()>0){ for(int i=0; i<list.size();i++){ Map v_map = (Map)list.get(i);json.append(this.getChildren(instcode,v_map.get("ORGCODE").toString()));// 获取子节点 } json=new StringBuffer(json.substring(0, json.length()-1)+"]}]");     } System.out.println(json); return json.toString(); }     /**      * 得到子节点      */     private String getChildren(String instcode,String orgcode){    String sql = "select orgcode,orgname,suporgcode from swe_emerplanorg where instcode ='"+instcode+"' and orgcode='"+orgcode+"' and suporgcode is null order by orgcode"; List list=jdbcT.queryForList(sql); StringBuffer child_json=new StringBuffer(); if(list!=null && list.size()>0){ for(int i=0; i<list.size();i++){ Map v_map = (Map)list.get(i); child_json.append("{\"id\":\""+v_map.get("ORGCODE").toString().trim()+"\","); child_json.append("\"text\":\""+v_map.get("ORGNAME").toString().trim()+"\""); String sql_2 = "select orgcode,orgname,suporgcode from swe_emerplanorg where instcode ='"+instcode+"' and suporgcode='"+v_map.get("ORGCODE")+"' order by orgcode"; List t_l=jdbcT.queryForList(sql_2); if(t_l!=null && t_l.size()>0){ child_json.append(",\"children\":["); for(int t=0; t<t_l.size();t++){  Map t_m = (Map)t_l.get(t);  child_json.append("{\"id\":\""+t_m.get("ORGCODE").toString().trim()+"\",");   child_json.append("\"text\":\""+t_m.get("ORGNAME").toString().trim()+"\"");   child_json.append(getNodes(instcode,t_m.get("ORGCODE").toString()));// 下级节点 } child_json=new StringBuffer(child_json.substring(0, child_json.lastIndexOf(","))+"]},"); }else{ child_json.append("},"); } } }else{ child_json.append("},"); }     return child_json.toString();     }          /**      * 获得节点       */     public String getNodes(String instcode,String orgcode){    String sql = "select orgcode,orgname,suporgcode from swe_emerplanorg where instcode ='"+instcode+"' and suporgcode ='"+orgcode+"' order by orgcode";  List list=jdbcT.queryForList(sql);  StringBuffer j_s=new StringBuffer();  if(list!=null && list.size()>0){  j_s.append(",\"children\":[");  for(int i=0; i<list.size();i++){  Map t_m = (Map)list.get(i);    j_s.append("{\"id\":\""+t_m.get("ORGCODE").toString().trim()+"\",");    j_s.append("\"text\":\""+t_m.get("ORGNAME").toString().trim()+"\"");    j_s.append(getNodes(instcode,t_m.get("ORGCODE").toString()));  }  }else{  j_s.append("},");  }  if(j_s.toString().contains("children")){  j_s=new StringBuffer(j_s.substring(0, j_s.lastIndexOf(",")));  j_s.append("]},");  }  return j_s.toString();     }

最终的实现图如下