tree后端实现

一：将字符串或对象转化成josn数据 1、将list对象转化成josn数据

JsonObject obj1=new JsonObject("1", "张三", null);
       JsonObject obj2=new JsonObject("2", "李四", null);
       List list=new ArrayList();
       list.add(obj1);
       list.add(obj2);
       ObjectMapper om=new ObjectMapper();
       System.out.println("方式一："+om.writevalueAsString(list));

2、将map集合转化成josn数据

Map< String, Object> map=new HashMap();
       map.put("id", "1");
       map.put("name", "张三");
       map.put("price", null);
       Map< String, Object> map2=new HashMap();
       map2.put("id", "2");
       map2.put("name", "李四");
       map2.put("price", null);
       List> listMap=new ArrayList<>();
       listMap.add(map);
       listMap.add(map2);
ObjectMapper om=new ObjectMapper();
       System.out.println("方式二："+om.writevalueAsString(listMap));

二：让josn书局有父子层级关系

主界面代码

<%@ page language="java" contentType="text/html; charset=UTF-8"
	pageEncoding="UTF-8"%>



后台界面

js文件代码

$(function() {
	$('#tt').tree({
		url:$("#ctx").val()+"/menu.action?methodName=tree",
		onClick : function(node) {
			var exists = $('#ttt').tabs('exists', node.text);
			if (exists) {
				$('#ttt').tabs('select', node.text);
			} else {
				$('#ttt')
						.tabs(
								'add',
								{
									title : node.text,
									content : '<iframe>',
									closable : true,
									tools : [ {
										iconCls : 'icon-mini-refresh',
										handler : function() {
											alert('refresh');
										}
									} ]
								});
			}
 
		}
	});
})
 </pre> 
<p> MVC配置</p> 
<blockquote> 
 <p><br />     </action> </p> 
</blockquote> 
<p>子控制器代码 </p> 
<pre class='brush:php;toolbar:false'>package com.zking.util;
 
import java.util.List;
 
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
 
import com.wmy.dao.Menudao;
import com.wmy.entity.Menu;
import com.wmy.entity.TreeVo;
import com.zking.framework.ActionSupport;
import com.zking.framework.ModelDriver;
 
public class Menuaction extends ActionSupport implements ModelDriver<Menu> {
	private Menu m = new Menu();
	private Menudao mdao = new Menudao();
 
	@Override
	public Menu getModel() {
		// TODO Auto-generated method stub
		return m;
	}
	public String tree(HttpServletRequest req, HttpServletResponse resp) throws Exception {
	///这个list是我自己写的dao包方法获取数据库的数据并转化为了具有父子级关系的数据
		List<TreeVo<Menu>> tree = mdao.tree(null, null);
		这里是把数据转化为josn数据方法被我封装后面给你们看
		ResponseUtil.writem(resp, tree);
		return null;
	}
 
}
 </pre> 
<p> </p> 
<p>ResponseUtil类</p> 
<pre class='brush:php;toolbar:false'>package com.zking.util;
 
import java.io.PrintWriter;
 
import javax.servlet.http.HttpServletResponse;
 
import com.fasterxml.jackson.databind.ObjectMapper;
 
public class ResponseUtil {
 
	public static void write(HttpServletResponse response,Object o)throws Exception{
		response.setContentType("text/html;charset=utf-8");
		PrintWriter out=response.getWriter();
		out.println(o.toString());
		out.flush();
		out.close();
	}
	public static void writem(HttpServletResponse response,Object o)throws Exception{
		ObjectMapper om=new ObjectMapper();
		write(response, om.writevalueAsString(o));
	}
}</pre> 
<p>将数据变成具有父子层级</p> 
<pre class='brush:php;toolbar:false'>package com.zking.util;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
 
import com.wmy.entity.TreeVo;
 
public class BuildTree {
T> TreeVo<T> build(List<TreeVo<T>> nodes) {
 
		if (nodes == null) {
			return null;
		}
		List<TreeVo<T>> topNodes = new ArrayList<TreeVo<T>>();
 
		for (TreeVo<T> children : nodes) {
			String pid = children.getParentId();
			if (pid == null || "-1".equals(pid)) {
				topNodes.add(children);
 
				continue;
			}
 
			for (TreeVo<T> parent : nodes) {
				String id = parent.getId();
				if (id != null && id.equals(pid)) {
					parent.getChildren().add(children);
					children.setHasParent(true);
					parent.setChildren(true);
					continue;
				}
			}
 
		}
 
		TreeVo<T> root = new TreeVo<T>();
		if (topNodes.size() == 1) {
			root = topNodes.get(0);
		} else {
			root.setId("000");
			root.setParentId("-1");
			root.setHasParent(false);
			root.setChildren(true);
			root.setChecked(true);
			root.setChildren(topNodes);
			root.setText("椤剁骇鑺傜偣");
			Map<String, Object> state = new HashMap<>(16);
			state.put("opened", true);
			root.setState(state);
		}
 
		return root;
	}
	public static <T> List<TreeVo<T>> buildList(List<TreeVo<T>> nodes, String idParam) {
		if (nodes == null) {
			return null;
		}
		List<TreeVo<T>> topNodes = new ArrayList<TreeVo<T>>();
 
		for (TreeVo<T> children : nodes) {
 
			String pid = children.getParentId();
			if (pid == null || idParam.equals(pid)) {
				topNodes.add(children);
 
				continue;
			}
 
			for (TreeVo<T> parent : nodes) {
				String id = parent.getId();
				if (id != null && id.equals(pid)) {
					parent.getChildren().add(children);
					children.setHasParent(true);
					parent.setChildren(true);
 
					continue;
				}
			}
 
		}
		return topNodes;
	}
 
}</pre> 
<p>运行结果</p> 
<p>后端数据库数据就显示到前端页面上了</p> 
<p> </p> 
<p> </p></div>
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