纯jsp代码递归实现树形结构显示

<%!	
	//递归实现树形结构显示
	public String getList(int parent_id) throws java.io.IOException {
		String strTree = "";

		String sql = "select * from tree where tree_parent='" + parent_id +"'";
		/*执行sql语句得到结果row，伪代码哦。*/
		try{

		for(int rownum = 0; rownum			String tree_id =  row.get("tree_id");
			String tree_name = row.get("tree_name"));

			strTree += "节点："+tree_name ;

			strTree += this.getList(Integer.valueOf(tree_id));

			}
			} catch(Exception e) {
				e.printStackTrace(System.out);
			}

			 return strTree;
	}
%>
<%
	out.print(getList(5));
	 %>