关于easy ui 异步加载生成树及点击树生成选项卡，这里直接给出代码，重点部分代码中均有注释

前台：

 $('#tree').tree({ 

               url: '../servlet/School_Tree?id=-1',  //向后台传送id,获取根节点

               lines:true,

               onBeforeExpand:function(node,param){

                     $('#tree').tree('options').url = "../servlet/School_Tree?id=" + node.id;  //动态获取节点

                 },

               loadFilter: function(data){

                  if (data.msg){

                      return data.msg;

                 } else {

                     return data;

                 }

            },

             onClick:function(node){                      //节点的点击事件

                   var url='information_'+node.id+'.jsp';

                   tab(node.text,url); 

              } 

         });   

 function tab(text,url) {

			if ($("#tabs").tabs('exists', text)) {   //若选项卡已存在，选择该选项卡

				$("#tabs").tabs('select', text);

			} else {

				var content = "<iframe frameborder='0' scrolling='auto' style='width:100%;height:100%' src="

						+ url + "></iframe>";   

				$("#tabs").tabs('add', {   //生成新的选项卡，

					title : text,

					closable : true,

					content :content,

				});

			}

		}

servlet:

package thejavabean;

import java.io.IOException;

import java.io.PrintWriter;

import java.util.List;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import net.sf.json.JSONArray;

import net.sf.json.JSONObject;

public class School_Tree extends HttpServlet {

	public void doGet(HttpServletRequest request, HttpServletResponse response)

			throws ServletException, IOException {

		response.setContentType("text/html");

		response.setCharacterEncoding("UTF-8");

		PrintWriter out = response.getWriter();

		String theIdString = request.getParameter("id");//父节点id

		int id=Integer.parseInt(theIdString);

		List<School> list=schoolTree(id);  //获取以id为父节点的数据

        String sc="[";

        for(School school:list){

        	sc+="{";

        	List<School> l=schoolTree(school.getId());  //判断id节点的儿子节点是否有儿子节点，即判断school中的数据是否为根节点

        	if(l.size()!=0){

        	  sc+=String.format("\"id\": \"%s\", \"text\": \"%s\", \"state\": \"closed\"", school.getId() ,school.getName());

        	}else{

        		sc+=String.format("\"id\": \"%s\", \"text\": \"%s\", \"state\": \"\"", school.getId() ,school.getName());

        	}

        	sc+="},";

        }

        sc=sc.substring(0, sc.length() - 1);

        sc+="]";

        JSONObject  jobj = new JSONObject();

		jobj.put("msg",sc);

		response.getWriter().write(jobj.toString());

		System.out.println(jobj.toString());

	}

    public List<School> schoolTree(int id){

    	StudentManage sm=new StudentManage();

    	School school=new School();

    	school.setId(id);

    	return sm.SchoolTree(school);

    }

	public void doPost(HttpServletRequest request, HttpServletResponse response)

			throws ServletException, IOException {

		this.doGet(request, response);

	}

}

javabean:

package thejavabean;

public class School {

	private int id;

	private int pid;

	private String name;

   public int getId() {

		return id;

	}

	public void setId(int id) {

		this.id = id;

	}

	public int getPid() {

		return pid;

	}

	public void setPid(int pid) {

		this.pid = pid;

	}

	public String getName() {

		return name;

	}

	public void setName(String name) {

		this.name = name;

	}

}

public List<School> SchoolTree(School school) {

			List<School> list = null;

			Connection conn = null;

			PreparedStatement ps = null;

			ResultSet rs = null;

			String sql = ""; 

				try {

					list = new ArrayList<School>();

					conn = dbc.getConnection();

					sql = "SELECT id,pid,name FROM SchoolManage where pid= "+school.getId();

					sql.toUpperCase();

					ps = conn.prepareStatement(sql);

					rs = ps.executeQuery();

					School s = null;

					while (rs.next()) {

						s = new School();

						s.setId(rs.getInt("id"));

						s.setPid(rs.getInt("pid"));

						s.setName(rs.getString("name"));

						list.add(s);

					}

				} catch (SQLException e) {

					e.printStackTrace();

				}finally {

					dbc.colseDB(conn, ps, rs);

				}

			return list;

		}

再来说一下数据表，共有三个字段，id，pid，name,大家可以自己写个数据表进行测试，还有DB是我简单封装过的，大家可以稍微结合自己的情况进行修改