JAVA 树形子父级菜单递归 JSON 格式

package tree;

import java.util.List;

/**
 * 
 * @author cenguocheng
 * 137544496@qq.com
 *	2018-7-24
 */
public class Menu {
    // 菜单id
    private String id;
    // 菜单名称
    private String name;
    // 父菜单id
    private String parentId;
    // 菜单url
    private String url;
    // 菜单图标
    private String icon;
    // 菜单顺序
    private int order;
    // 子菜单
    private List<Menu> childMenus;
    
	public Menu(String id, String name, String parentId) {
		super();
		this.id = id;
		this.name = name;
		this.parentId = parentId;
	}
	
	@Override
	public String toString() {
		return "Menu [id=" + id + ", name=" + name + ", parentId=" + parentId
				+ ", url=" + url + ", icon=" + icon + ", order=" + order
				+ ", childMenus=" + childMenus + "]";
	}

	public String getId() {
		return id;
	}
	public void setId(String id) {
		this.id = id;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public String getParentId() {
		return parentId;
	}
	public void setParentId(String parentId) {
		this.parentId = parentId;
	}
	public String getUrl() {
		return url;
	}
	public void setUrl(String url) {
		this.url = url;
	}
	public String getIcon() {
		return icon;
	}
	public void setIcon(String icon) {
		this.icon = icon;
	}
	public int getOrder() {
		return order;
	}
	public void setOrder(int order) {
		this.order = order