java实现的树easyui

package cn.com.zhongway.base.treeJson; import java.util.ArrayList; import java.util.List; import java.util.Map; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import net.sf.json.JSONObject; import org.json.JSONArray; import cn.com.zhongway.base.database.eoms.dbutils.DBProxy; import cn.com.zhongway.base.database.eoms.dbutils.DBUtilInterface; import cn.com.zhongway.base.database.eoms.dbutils.DbUtil; import cn.com.zhongway.base.pub.common.esb.ESBServerClassInterface; /** * 2013/4/12 * * @author leon * */ public class GetComboTreeJson implements ESBServerClassInterface { public String deal(HttpServletRequest request, HttpServletResponse response, Object arg2) throws Exception { String jsonData = ""; // 获取传入参数 String ls_sqlid = request.getParameter("in_sqlid");// 子节点查询条件 DBProxy proxy = new DBProxy(new DbUtil(), request); DBUtilInterface db = proxy.getDb(); // 传入参数名称 String[] paramName = { "in_sqlid"}; // 传入参数 String[] param = { ls_sqlid }; // 返回游标的名称 String[] cursor = { "queryresult"}; // 执行的存储过程 String proc = "{call proc_cz_query_comboTree(?,?)}"; Map dataMap = db.callproc_more_cursor(proc, paramName, param, cursor);// 获取数据 List dataList = (List) dataMap.get("queryresult"); TreeNode treeNode = this.getTreeNode(dataList); String str = "["+getTree(treeNode).substring(0,getTree(treeNode).length()-1)+"]"; response.setCharacterEncoding("utf-8"); response.getWriter().print(str); return null; } //递归输出子节点 // public void printChild(TreeNode rootNode){ // for(TreeNode childNode : rootNode.getChildList()){ // StringBuilder nodePrefix = new StringBuilder(); // for(int i=0;i<childNode.getLevel();i++){ // nodePrefix.append(" "); // } // // if(childNode.isLeaf()==true){ // nodePrefix.append("--"); // }else{ // nodePrefix.append("++"); // } // System.out.println(nodePrefix+"{\"id\":\""+childNode.getId()+"\",\"text\":\""+childNode.getText()+"\"}"); // //str += (nodePrefix); // this.printChild(childNode); // } // } public String getTree(TreeNode rootNode){ String str=""; for(TreeNode childNode : rootNode.getChildList()){ if(childNode.isLeaf()==true){ str+= "{id:"+childNode.getId()+",text:'"+childNode.getText()+"'},"; }else{ str+= "{id:"+childNode.getId()+",text:'"+childNode.getText()+"',children:["+getTree(childNode).substring(0,getTree(childNode).length()-1)+"]},"; } } return str; } //得到根节点 public TreeNode getTreeNode(List dataList){ //Map rootMap = (Map) dataList.get(0); TreeNode rootNode = new TreeNode(); rootNode.setId(""); rootNode.setText(""); // rootNode.setId(rootMap.get("ID").toString()); // rootNode.setText(rootMap.get("TEXT").toString()); rootNode.setLeaf(false); rootNode.setLevel(0); List<TreeBean> nodeList = this.getNodeList(dataList); rootNode = this.constructTree(rootNode, nodeList, 0); return rootNode; } //转换数据格式List<Map> to List<TreeBean> public List<TreeBean> getNodeList(List queryResult){ List<TreeBean> nodeList = new ArrayList<TreeBean>(); TreeBean bean = null; for(int i=0;i<queryResult.size();i++){ Map curMap = (Map) queryResult.get(i); String id = curMap.get("ID").toString(); String text = curMap.get("TEXT").toString(); String pid = curMap.get("PID").toString(); bean = new TreeBean(id,text,pid); nodeList.add(bean); } return nodeList; } //递归得到树 public TreeNode constructTree(TreeNode rootNode,List<TreeBean> nodeList,int rootLevel){ List<TreeNode> childList = new ArrayList<TreeNode>(); //构造根节点 for(int i=0;i<nodeList.size();i++){ TreeBean bean = nodeList.get(i); if(bean.getPid().equalsIgnoreCase(rootNode.getId())){ TreeNode childNode = new TreeNode(); childNode.setId(bean.getId()); childNode.setText(bean.getText()); childNode.setParent(rootNode); childNode.setLevel(rootLevel+1); childList.add(childNode); } } //设置子节点 rootNode.setChildList(childList); //设置是否为叶子节点 if(childList.size()==0){ rootNode.setLeaf(true); }else{ rootNode.setLeaf(false); } //递归构造子节点 for(int i=0;i<childList.size();i++){ constructTree(childList.get(i), nodeList, ++rootLevel); --rootLevel; } return rootNode; } }