直接上代码，以后再细说

数据结构定义：

/**
 * 
 */
package Servlet;

import java.util.ArrayList;
import java.util.List;

/**
 * @author lei
 *
 */
public class node {
private String text;
private List<node>childList;
public String getText() {
	return text;
}
public void setText(String text) {
	this.text = text;
}
public List<node> getChildList() {
	return childList;
}
public void setChildList(List<node> childList) {
	this.childList = childList;
}
public static node getInitNode()
{
	node nodeA=new node();
	nodeA.setText("A");
    node nodeB=new node();
    nodeB.setText("B");
    node nodeC=new node();
    nodeC.setText("C");
    node nodeD=new node();
    nodeD.setText("D");
    node nodeE=new node();
    nodeE.setText("E");
    
    List<node>lstB=new ArrayList();
    lstB.add(nodeC);
    lstB.add(nodeD);
    nodeB.setChildList(lstB);
    
    List<node>lstA=new ArrayList();
    lstA.add(nodeB);
    lstA.add(nodeE);
    nodeA.setChildList(lstA);
    return nodeA;
    
}
}

/**
 * 
 */
package Servlet;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Stack;   
/**
 * @author lei
 *
 */
public class IteratorNodeTool {
	Map<String,List> pathMap=new HashMap();//记录所有从根节点到叶子结点的路径
	private void print(List lst)//打印出路径
	{
		Iterator it=lst.iterator();
		while(it.hasNext())
		{
			node n=(node)it.next();
			System.out.print(n.getText()+"-");
		}
		System.out.println();
	}
	public void iteratorNode(node n,Stack<node> pathstack)
	{
		  pathstack.push(n);//入栈
		  List childlist=n.getChildList();
		  if(childlist==null)//没有孩子 说明是叶子结点
		  {
			  List lst=new ArrayList();
			  Iterator stackIt=pathstack.iterator();
			  while(stackIt.hasNext())
			  {
				  lst.add(stackIt.next());
				  
			  }
			  print(lst);//打印路径
		     pathMap.put(n.getText(), lst);//保存路径信息
		    return;
		  }else
		  {
			  Iterator it=childlist.iterator();
			  while(it.hasNext())
			  {
				   node child=(node)it.next();
				   iteratorNode(child,pathstack);//深度优先 进入递归
				   pathstack.pop();//回溯时候出栈
			  }
			  
		  }
		  
	}
	public static void main(String[] args) {
		Stack <node>pathstack=new Stack();
		node n=node.getInitNode();
		IteratorNodeTool  tool=new IteratorNodeTool();
		tool.iteratorNode(n, pathstack);
	}

}

java 遍历树结点 同时保留所有从根到叶子结点的路径