这是ztree抽象类，方便扩展。

public abstract class AbstractZtree
    
      {		/**	 * 默认初始化顶级id	 */	public static final String TOP = "0001";		//本级Id	protected String id; 	//父级菜单的 id	protected String pId; 	//中文名称	protected String name; 	//点击地址	protected String url; 	//是否展开	protected boolean open; 	//是否为父节点	protected boolean isParent; 		protected List
     
       children = new ArrayList
      
       ();		public AbstractZtree() {	}	public AbstractZtree(String id, String pId, String name, boolean open, boolean isParent) {		super();		this.id = id;		this.pId = pId;		this.name = name;		this.open = open;		this.isParent = isParent;	}        ... 大量get set 方法
      
     
    

继承类主要是测试Builder 只是测试Builder 所以就不做无限递归了

public class ZtreeDemoVo extends AbstractZtree
    
     {		public static final String TREE_NAME = "测试";		public ZtreeDemoVo() {			}		private ZtreeDemoVo(Builder builder){		super(builder.id, builder.pId, builder.name, builder.open, builder.isParent);	}		/**	 * 传入上级编码 跟下级数据bean 生产二级节点。	 * @param pid	 */	public void initChildren(String pid , List
     
       beans){		List
      
        ls = new ArrayList
       
        ();		ZtreeDemoVo data = null;		for (Bean bean : beans) {			data = new ZtreeDemoVo						.Builder()						.id(bean.getId())						.pId(pid)						.name(bean.getName())						.open(false)						.isParent(false)						.build();			ls.add(data);		}		this.children = ls;	}			public static class Builder {		//本级Id		private String id = getTop(); 		//父级菜单的 id		private String pId = null;		//中文名称		private String name = TREE_NAME; 		//是否展开		private boolean open = true; 		//是否为父节点		private boolean isParent = true; 				public Builder id(String id){			this.id = id;			return this;		}				public Builder pId(String pId){			this.pId = pId;			return this;		}				public Builder name(String name){			this.name = name;			return this;		}				public Builder open(Boolean open){			this.open = open;			return this;		}				public Builder isParent(Boolean isParent){			this.isParent = isParent;			return this;		}				public ZtreeDemoVo build(){			return new ZtreeDemoVo(this);		}	}}
       
      
     
    

测试bean

public class Bean {		private String id;		private String pid;		private String name;	public String getId() {		return id;	}	public Bean() {		// TODO Auto-generated constructor stub	}		public Bean(String id, String pid, String name) {		super();		this.id = id;		this.pid = pid;		this.name = name;	}      ... 大量get set 方法

测试类 这里的Json.toJson()就是bean 转json跟Gson什么的差不多的功能。

public class ZtreeTest {			@Test	public void ztree(){		List
    
      beans = new ArrayList
     
      ();		Bean data = null;		for (int i = 0; i < 3; i++) {  //模拟假数据			data = new Bean(String.valueOf(i), String.valueOf(i), String.valueOf(i));			beans.add(data);		}		ZtreeDemoVo vo = new ZtreeDemoVo.Builder().build();		vo.initChildren(vo.getId(),beans); //初始化二级数据		System.out.println(Json.toJson(vo));			}}
     
    

结果

{   "id": "0001",   "name": "测试",   "open": true,   "isParent": true,   "children": [{      "id": "0",      "pId": "0001",      "name": "0",      "open": false,      "isParent": false,      "children": []   }, {      "id": "1",      "pId": "0001",      "name": "1",      "open": false,      "isParent": false,      "children": []   }, {      "id": "2",      "pId": "0001",      "name": "2",      "open": false,      "isParent": false,      "children": []   }]}