BootStrap Jstree 树形菜单的增删改查的实现源码

1.首先需下载jstree的插件点击打开链接

2.在页面引入插件js文件css文件

3.初始化控件

 1）html

2）js 使用 demo2来初始化树形控件

4.代码解析

 
import java.util.List; 
public class Department { 
 // 部门id 
 private String departmentid; 
 // 部门名称 
 private String name; 
 // 父级部门ID 
 private String parentid; 
 //同级之间的排序。排序id 小的排前面 
 private String orders; 
 //子节点 
 private List childNode; 
 public List getChildNode() { 
 return childNode; 
 } 
 public void setChildNode(List childNode) { 
 this.childNode = childNode; 
 } 
 public String getDepartmentid() { 
 return departmentid; 
 } 
 public void setDepartmentid(String departmentid) { 
 this.departmentid = departmentid; 
 } 
 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 getOrders() { 
 return orders; 
 } 
 public void setOrders(String orders) { 
 this.orders = orders; 
 } 
 @Override 
 public String toString(){ 
 return "[departmentID:"+this.departmentid+ 
 "departmentName:"+this.name+ 
 "parentID:"+this.parentid+"orders:"+this.orders+"]"; 
 } 
} 

4.代码解析

插件初始化我这里使用了插件的两个参数json_data,以及plugins注意看代码结构

4.1上图两个部分即初始化部分重点解释下plugins这个参数是jstree整合插件的地方theme表示主题，json_data将上文定义的json_data也就

是Ajax从后要获取json数据返回到前台页面。contextmenu，是鼠标右键在树形节点上会弹出增删改查的菜单。

4.2 json数据的格式

先看展示

这是一个可以无限极下分的菜单，我们可以根据上图的目录结构对照下面的json数据结构来看，这样会更清晰。

{"data":"软件及数据","attr":{"id":"e59365b9-7b2a-43a3-b10a-cfe03d5eb004"}, 
 "children":[ 
 {"data":"创新组","attr":{"id":"73919359-2a1b-4ee7-bcc2-56949e8560e8"}, 
  "children":[ 
   {"data":"大数据","attr":{"id":"a7ea6a0f-0b78-4064-803b-f2e0a95d914f"}, 
   "children":[ 
    {"data":"研发","attr":{"id":"fc20e438-e7b9-4cca-be6a-49965daab528"},"children":[]}]}]}, 
 {"data":"项目管理","attr":{"id":"e1bdae71-6cfb-4e8c-ab29-a3eb03b9961d"},"children":[]} 
 ] 
}, 

4.4组装json数据，我使用的是首先查找到所有的父节点即parentid=1的时候，然后递归将所有的子节点加到List对象里面，紧接着再通过循环递归组装无限极菜单json数据下面看数据库数据结构

import java.util.List; 
public class Department { 
 // 部门id 
 private String departmentid; 
 // 部门名称 
 private String name; 
 // 父级部门ID 
 private String parentid; 
 //同级之间的排序。排序id 小的排前面 
 private String orders; 
 //子节点 
 private List childNode; 
 public List getChildNode() { 
  return childNode; 
 } 
 public void setChildNode(List childNode) { 
  this.childNode = childNode; 
 } 
 public String getDepartmentid() { 
  return departmentid; 
 } 
 public void setDepartmentid(String departmentid) { 
  this.departmentid = departmentid; 
 } 
 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 getOrders() { 
  return orders; 
 } 
 public void setOrders(String orders) { 
  this.orders = orders; 
 } 
 @Override 
 public String toString(){ 
  return "[departmentID:"+this.departmentid+ 
  "departmentName:"+this.name+ 
  "parentID:"+this.parentid+"orders:"+this.orders+"]"; 
 } 
} 

4.5 此处servlet为客户端提供jstree的json_data。就是在初始化控件时候有ajax调用这个servlet获取json数据并返回给json_data

import java.io.IOException; 
import java.io.PrintWriter; 
import javax.servlet.ServletException; 
import javax.servlet.http.HttpServlet; 
import javax.servlet.http.HttpServletRequest; 
import javax.servlet.http.HttpServletResponse; 
import cn.goldwind.www.service.DepartmentService; 
import cn.goldwind.www.serviceimpl.DepartmentServiceImpl; 
public class DepartmentTreeJson extends HttpServlet { 
 /** 
  * 
  */ 
 private static final long serialVersionUID = 1L; 
 public DepartmentTreeJson() { 
  super(); 
 } 
 @Override 
 public void destroy() { 
  super.destroy(); // Just puts "destroy" string in log 
  // Put your code here 
 } 
 @Override 
 public void doGet(HttpServletRequest request, HttpServletResponse response) 
   throws ServletException, IOException { 
  request.setCharacterEncoding("utf-8"); 
  response.setContentType("text/html;charset=UTF-8"); 
  PrintWriter out = response.getWriter(); 
  DepartmentService deptService=new DepartmentServiceImpl(); 
  //此处调用创建树节点的方法 
  StringBuilder json=deptService.createTreeNode(); 
  json.deleteCharAt(json.length()-1); 
  System.out.println(json); 
  out.print("["+json+"]"); 
  out.flush(); 
  out.close(); 
 } 
 @Override 
 public void doPost(HttpServletRequest request, HttpServletResponse response) 
   throws ServletException, IOException { 
  doGet(request, response); 
 } 
 @Override 
 public void init() throws ServletException { 
  // Put your code here 
 } 
} 

4.6上面servlet我们看下createTreeNode方法

这里是创建json的核心。

1）首先获取所有的（parent=1）根节点

@Override 
 public StringBuilder createTreeNode() { 
  //创建部门集合 
  List departments = new ArrayList(); 
  //放置所有的根节点部门实体 
  departments = queryByParentID("1"); 
  if (departments != null) { 
   return json(departments); 
  } 
  return null; 
 } 
 public StringBuilder json(List departments) { 
  for (int i = 0; i < departments.size(); i++) { 
   json.append('{'); 
   json.append("\"data\":\"").append(departments.get(i).getName()) 
     .append("\","); 
   json.append("\"attr\":{\"id\":\"").append(departments.get(i).getDepartmentid()).append("\"},"); 
   List deptchild = queryByParentID(departments.get(i) 
     .getDepartmentid()); 
   json.append("\"children\":"); 
   json.append('['); 
   if (deptchild != null) { 
    json(deptchild); 
    if("1".equals(departments.get(i).getParentid())){ 
     json.deleteCharAt(json.length()-1); 
     json.append(']'); 
     json.append('}'); 
     json.append(','); 
    }if(!"1".equals(departments.get(i).getParentid())&&deptchild!=null){ 
     json.deleteCharAt(json.length()-1); 
     json.append(']'); 
     json.append('}'); 
     json.append(','); 
    } 
   } else{ 
    json.append(']'); 
    json.append('}'); 
    json.append(','); 
   } 
  } 
  return json; 
 } 
 @Override 
 public List queryByParentID(String parentID) { 
  BaseDaoTemplate bd = new BaseDaoTemplate(); 
  List departments = new ArrayList(); 
  String sql = "select departmentid,name,parentid,orders from department where parentid=? "; 
  List