esyui异步树java实现

页面：

$(function(){
$('#myTree').tree({
		    url:"rest/organizationRestFul/getJson",
		    loadFilter: function(data){
					return data;
		    },
		    onLoadSuccess: function (node, data) {
		   // 	var node = $('#myTree').tree('find',1);
	    	//	$("#myTree").tree("collapseAll", node.target);
		    	var roots = $("#myTree").tree("getRoots");
		    	if (roots.length > 0) {
			    	$.each(roots, function (i, item) {
			    		var node = $('#myTree').tree('find',  item.id);
			    		$("#myTree").tree("collapseAll", node.target);//树加载默认时折叠状态
			    	});
		    	}
		    }
		});
});

java后台：
新增实体类：

package com.gwm.pur.cdata.organization.entity;
 
import java.util.List;
import java.util.Map;
 

public class easyuiTree {
    // 菜单id
    private String id;
    // 要显示的节点文本
    private String text;
    // 节点状态，'open' 或 'closed'，默认是 'open'。当设置为 'closed' 时，该节点有子节点，并且将从远程站点加载它们。
    private String state;
    // 指示节点是否被选中。
    private String checked;
    // 给一个节点添加的自定义属性
    private Map attributes;
    // 子菜单
    private List children;
    //父节点
    private String parentId;
       
    
	public String getParentId() {
		return parentId;
	}
	public void setParentId(String parentId) {
		this.parentId = parentId;
	}
	public String getId() {
		return id;
	}
	public void setId(String id) {
		this.id = id;
	}
	public String getText() {
		return text;
	}
	public void setText(String text) {
		this.text = text;
	}
	public String getState() {
		return state;
	}
	public void setState(String state) {
		this.state = state;
	}
	public String getChecked() {
		return checked;
	}
	public void setChecked(String checked) {
		this.checked = checked;
	}
	public Map getAttributes() {
		return attributes;
	}
	public void setAttributes(Map attributes) {
		this.attributes = attributes;
	}
	public List getChildren() {
		return children;
	}
	public void setChildren(List children) {
		this.children = children;
	}	
}

restful层

@RequestMapping(value = "/getJson", method = RequestMethod.POST,produces = "text/html;charset=utf-8")
	public @ResponseBody String getJson(HttpServletRequest request){
		try{
			 //接收树上传来的ID参数（异步加载时会返回id）
	        String id = request.getParameter("id");
			OrganizationEntity query = new OrganizationEntity();
			if(id!=null&&!id.equals("")){
				query.setId(Long.parseLong(id));
			}
			List organizationList = organizationService.findList(query,null);
			List menuList = new ArrayList(); // 树递归
			List totalList = new ArrayList(); // 树递归
			  
			// 先找到所有的一级菜单
		    for (int i = 0; i < organizationList.size(); i++) {
		    	easyuiTree menu = new easyuiTree();
		    	menu.setId(organizationList.get(i).getId().toString());
		    	menu.setText(organizationList.get(i).getName());
		    	menu.setParentId(organizationList.get(i).getParentId().toString());
		    //	menu.setState("closed");
		    	totalList.add(menu);
		        // 一级菜单父ID为0
		        if (organizationList.get(i).getParentId()==0) {
		            menuList.add(menu);
		        }
		    }
		    
		    // 为一级菜单设置子菜单，getChild是递归调用的
		    for (easyuiTree menu : menuList) {
		        menu.setChildren(getChild(menu.getId(), totalList));
		    }
	///	    Map jsonMap = new HashMap();
	//	    jsonMap.put("menu", menuList);
	//	    System.out.println(JSON.toJSONString(jsonMap));
		    String list = JsonHelper.encodeObject2Json(menuList, "yyyy-MM-dd HH:mm:ss").toString();
			return list;
		}catch(Exception e){
			e.printStackTrace();
		}
		return null;
	}
	/**
	 * 子菜单递归
	 * @param id
	 * @param rootMenu
	 * @return
	 */
	private static List getChild(String id, List rootMenu) {
	    // 子菜单
	    List childList = new ArrayList();
	    for (easyuiTree menu : rootMenu) {
	        // 遍历所有节点，将父菜单id与传过来的id比较
            if (menu.getParentId().equals(id)) {
                childList.add(menu);
            }
	    }
	    
	    // 把子菜单的子菜单再循环一遍
	    for (easyuiTree menu : childList) {
	        menu.setChildren(getChild(menu.getId(), rootMenu));// 递归
	    } 
	    
	    // 判断递归结束
	    if (childList.size() == 0) {
	        return null;
	    }
	    return childList;
	}