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JSP 动态树的实现

摘要：第一步：在开始之前我们需要准备这么一个js文件，代码如下。我姑且将它命名为tree.js。复制代码代码如下:functionNode(id,...

第一步：在开始之前我们需要准备这么一个js文件，代码如下。我姑且将它命名为tree.js。

复制代码代码如下:

function Node(id, pid, name, url, title, target, icon, iconOpen, open, appendedStr) {

this.id = id;

this.pid = pid;

this.name = name;

this.url = url;

this.title = title;

this.target = target;

this.icon = icon;

this.iconOpen = iconOpen;

this.appendedStr = appendedStr;

this._io = open || false;

this._is = false;

this._ls = false;

this._hc = false;

this._ai = 0;

this._p;

};

// Tree object

function tree(objName,path) {

this.path = path;

this.config = {

target: null,

folderLinks: true,

useSelection: true,

useCookies: true,

useLines: true,

useIcons: true,

useStatusText: false,

closeSameLevel: false,

inOrder: false

}

this.icon = {

root: path + 'TreeDemo/images/tree_base.gif',

folder: path + 'TreeDemo/images/tree_folder.gif',

folderOpen: path + 'TreeDemo/images/tree_folderopen.gif',

node: path + 'TreeDemo/images/tree_folder.gif',

empty: path + 'TreeDemo/images/tree_empty.gif',

line: path + 'TreeDemo/images/tree_line.gif',

join: path + 'TreeDemo/images/tree_join.gif',

joinBottom: path + 'TreeDemo/images/tree_joinbottom.gif',

plus: path + 'TreeDemo/images/tree_plus.gif',

plusBottom: path + 'TreeDemo/images/tree_plusbottom.gif',

minus: path + 'TreeDemo/images/tree_minus.gif',

minusBottom: path + 'TreeDemo/images/tree_minusbottom.gif',

nlPlus: path + 'TreeDemo/images/tree_nolines_plus.gif',

nlMinus: path + 'TreeDemo/images/tree_nolines_minus.gif'

};

this.obj = objName;

this.aNodes = [];

this.aIndent = [];

this.root = new Node(-1);

this.selectedNode = null;

this.selectedFound = false;

this.completed = false;

};

// Adds a new node to the node array

tree.prototype.add = function(id, pid, name, url, title, target, icon, iconOpen, open, appendedStr) {

this.aNodes[this.aNodes.length] = new Node(id, pid, name, url, title, target, icon, iconOpen, open, appendedStr);

};

// Open/close all nodes

tree.prototype.openAll = function() {

this.oAll(true);

};

tree.prototype.closeAll = function() {

this.oAll(false);

};

// Outputs the tree to the page

tree.prototype.toString = function() {

var str = '<div>n';

if (document.getElementById) {

if (this.config.useCookies) this.selectedNode = this.getSelected();

str += this.addNode(this.root);

} else str += 'Browser not supported.';

str += '</div>';

if (!this.selectedFound) this.selectedNode = null;

this.completed = true;

return str;

};

// Creates the tree structure

tree.prototype.addNode = function(pNode) {

var str = '';

var n=0;

if (this.config.inOrder) n = pNode._ai;

for (n; n<this.aNodes.length; n++) {

if (this.aNodes[n].pid == pNode.id) {

var cn = this.aNodes[n];

cn._p = pNode;

cn._ai = n;

this.setCS(cn);

if (!cn.target && this.config.target) cn.target = this.config.target;

if (cn._hc && !cn._io && this.config.useCookies) cn._io = this.isOpen(cn.id);

if (!this.config.folderLinks && cn._hc) cn.url = null;

if (this.config.useSelection && cn.id == this.selectedNode && !this.selectedFound) {

cn._is = true;

this.selectedNode = n;

this.selectedFound = true;

}

str += this.node(cn, n);

if (cn._ls) break;

}

return str;

};

// Creates the node icon, url and text

tree.prototype.node = function(node, nodeId) {

var str = '<div>' + this.indent(node, nodeId);

if (this.config.useIcons) {

if (!node.icon) node.icon = (this.root.id == node.pid) ? this.icon.root : ((node._hc) ? this.icon.folder : this.icon.node);

if (!node.iconOpen) node.iconOpen = (node._hc) ? this.icon.folderOpen : this.icon.node;

if (this.root.id == node.pid) {

node.icon = this.icon.root;

node.iconOpen = this.icon.root;

}

str += '<img id="i' + this.obj + nodeId + '" src="' + ((node._io) ? node.iconOpen : node.icon) + '" src="' + ((node._io) ? node.iconOpen : node.icon) + '" alt="" />';

}

if (node.url) {

str += '<a id="s' + this.obj + nodeId + '" + ((this.config.useSelection) ? ((node._is ? 'nodeSel' : 'node')) : 'node') + '" href="' + node.url + '" href="' + node.url + '"';

if (node.title) str += ' title="' + node.title + '"';

if (node.target) str += ' target="' + node.target + '"';

if (this.config.useStatusText) str += ' onmouseover="window.status='' + node.name + '';return true;" onmouseout="window.status='';return true;" ';

if (this.config.useSelection && ((node._hc && this.config.folderLinks) || !node._hc))

str += '';

str += '>';

}

else if ((!this.config.folderLinks || !node.url) && node._hc && node.pid != this.root.id)

str += '<a href="javascript: ' + this.obj + '.o(' + nodeId + ');" href="javascript: ' + this.obj + '.o(' + nodeId + ');">';

str += node.name;

if (node.url || ((!this.config.folderLinks || !node.url) && node._hc)) str += '</a>';

//[]add by wangxr to append str

if(node.appendedStr) str += node.appendedStr;

//[]

str += '</div>';

if (node._hc) {

str += '<div id="d' + this.obj + nodeId + '" + ((this.root.id == node.pid || node._io) ? 'block' : 'none') + ';" + ((this.root.id == node.pid || node._io) ? 'block' : 'none') + ';">';

str += this.addNode(node);

str += '</div>';

}

this.aIndent.pop();

return str;

};

// Adds the empty and line icons

tree.prototype.indent = function(node, nodeId) {

var str = '';

if (this.root.id != node.pid) {

for (var n=0; n<this.aIndent.length; n++)

str += '<img src="' + ( (this.aIndent[n] == 1 && this.config.useLines) ? this.icon.line : this.icon.empty ) + '" src="' + ( (this.aIndent[n] == 1 && this.config.useLines) ? this.icon.line : this.icon.empty ) + '" alt="" />';

(node._ls) ? this.aIndent.push(0) : this.aIndent.push(1);

if (node._hc) {

str += '<a href="javascript: ' + this.obj + '.o(' + nodeId + ');" href="javascript: ' + this.obj + '.o(' + nodeId + ');"><img id="j' + this.obj + nodeId + '" src="';

if (!this.config.useLines) str += (node._io) ? this.icon.nlMinus : this.icon.nlPlus;

else str += ( (node._io) ? ((node._ls && this.config.useLines) ? this.icon.minusBottom : this.icon.minus) : ((node._ls && this.config.useLines) ? this.icon.plusBottom : this.icon.plus ) );

str += '" src="'; if (!this.config.useLines) str += (node._io) ? this.icon.nlMinus : this.icon.nlPlus; else str += ( (node._io) ? ((node._ls && this.config.useLines) ? this.icon.minusBottom : this.icon.minus) : ((node._ls && this.config.useLines) ? this.icon.plusBottom : this.icon.plus ) ); str += '" alt="" /></a>';

} else str += '<img src="' + ( (this.config.useLines) ? ((node._ls) ? this.icon.joinBottom : this.icon.join ) : this.icon.empty) + '" src="' + ( (this.config.useLines) ? ((node._ls) ? this.icon.joinBottom : this.icon.join ) : this.icon.empty) + '" alt="" />';

}

return str;

};

// Checks if a node has any children and if it is the last sibling

tree.prototype.setCS = function(node) {

var lastId;

for (var n=0; n<this.aNodes.length; n++) {

if (this.aNodes[n].pid == node.id) node._hc = true;

if (this.aNodes[n].pid == node.pid) lastId = this.aNodes[n].id;

}

if (lastId==node.id) node._ls = true;

};

// Returns the selected node

tree.prototype.getSelected = function() {

var sn = this.getCookie('cs' + this.obj);

return (sn) ? sn : null;

};

// Highlights the selected node

tree.prototype.s = function(id) {

if (!this.config.useSelection) return;

var cn = this.aNodes[id];

if (cn._hc && !this.config.folderLinks) return;

if (this.selectedNode != id) {

if (this.selectedNode || this.selectedNode==0) {

eOld = document.getElementById("s" + this.obj + this.selectedNode);

eOld.className = "node";

}

eNew = document.getElementById("s" + this.obj + id);

eNew.className = "nodeSel";

this.selectedNode = id;

if (this.config.useCookies) this.setCookie('cs' + this.obj, cn.id);

}

};

// Toggle Open or close

tree.prototype.o = function(id) {

var cn = this.aNodes[id];

this.nodeStatus(!cn._io, id, cn._ls);

cn._io = !cn._io;

if (this.config.closeSameLevel) this.closeLevel(cn);

if (this.config.useCookies) this.updateCookie();

};

// Open or close all nodes

tree.prototype.oAll = function(status) {

for (var n=0; n<this.aNodes.length; n++) {

if (this.aNodes[n]._hc && this.aNodes[n].pid != this.root.id) {

this.nodeStatus(status, n, this.aNodes[n]._ls)

this.aNodes[n]._io = status;

}

if (this.config.useCookies) this.updateCookie();

};

// Opens the tree to a specific node

tree.prototype.openTo = function(nId, bSelect, bFirst) {

if (!bFirst) {

for (var n=0; n<this.aNodes.length; n++) {

if (this.aNodes[n].id == nId) {

nId=n;

break;

}

var cn=this.aNodes[nId];

if (cn.pid==this.root.id || !cn._p) return;

cn._io = true;

cn._is = bSelect;

if (this.completed && cn._hc) this.nodeStatus(true, cn._ai, cn._ls);

if (this.completed && bSelect) this.s(cn._ai);

else if (bSelect) this._sn=cn._ai;

this.openTo(cn._p._ai, false, true);

};

// Closes all nodes on the same level as certain node

tree.prototype.closeLevel = function(node) {

for (var n=0; n<this.aNodes.length; n++) {

if (this.aNodes[n].pid == node.pid && this.aNodes[n].id != node.id && this.aNodes[n]._hc) {

this.nodeStatus(false, n, this.aNodes[n]._ls);

this.aNodes[n]._io = false;

this.closeAllChildren(this.aNodes[n]);

}

// Closes all children of a node

tree.prototype.closeAllChildren = function(node) {

for (var n=0; n<this.aNodes.length; n++) {

if (this.aNodes[n].pid == node.id && this.aNodes[n]._hc) {

if (this.aNodes[n]._io) this.nodeStatus(false, n, this.aNodes[n]._ls);

this.aNodes[n]._io = false;

this.closeAllChildren(this.aNodes[n]);

}

// Change the status of a node(open or closed)

tree.prototype.nodeStatus = function(status, id, bottom) {

eDiv= document.getElementById('d' + this.obj + id);

eJoin= document.getElementById('j' + this.obj + id);

if (this.config.useIcons) {

eIcon= document.getElementById('i' + this.obj + id);

eIcon.src = (status) ? this.aNodes[id].iconOpen : this.aNodes[id].icon;

}

eJoin.src = (this.config.useLines)?

((status)?((bottom)?this.icon.minusBottom:this.icon.minus):((bottom)?this.icon.plusBottom:this.icon.plus)):

((status)?this.icon.nlMinus:this.icon.nlPlus);

eDiv.style.display = (status) ? 'block': 'none';

};

// [Cookie] Clears a cookie

tree.prototype.clearCookie = function() {

var now = new Date();

var yesterday = new Date(now.getTime() - 1000 * 60 * 60 * 24);

this.setCookie('co'+this.obj, 'cookieValue', yesterday);

this.setCookie('cs'+this.obj, 'cookieValue', yesterday);

};

// [Cookie] Sets value in a cookie

tree.prototype.setCookie = function(cookieName, cookieValue, expires, path, domain, secure) {

document.cookie =

escape(cookieName) + '=' + escape(cookieValue)

+ (expires ? '; expires=' + expires.toGMTString() : '')

+ (path ? '; path=' + path : '')

+ (domain ? '; domain=' + domain : '')

+ (secure ? '; secure' : '');

};

// [Cookie] Gets a value from a cookie

tree.prototype.getCookie = function(cookieName) {

var cookieValue = '';

var posName = document.cookie.indexOf(escape(cookieName) + '=');

if (posName != -1) {

var posValue = posName + (escape(cookieName) + '=').length;

var endPos = document.cookie.indexOf(';', posValue);

if (endPos != -1) cookieValue = unescape(document.cookie.substring(posValue, endPos));

else cookieValue = unescape(document.cookie.substring(posValue));

}

return (cookieValue);

};

// [Cookie] Returns ids of open nodes as a string

tree.prototype.updateCookie = function() {

var str = '';

for (var n=0; n<this.aNodes.length; n++) {

if (this.aNodes[n]._io && this.aNodes[n].pid != this.root.id) {

if (str) str += '.';

str += this.aNodes[n].id;

}

this.setCookie('co' + this.obj, str);

};

// [Cookie] Checks if a node id is in a cookie

tree.prototype.isOpen = function(id) {

var aOpen = this.getCookie('co' + this.obj).split('.');

for (var n=0; n<aOpen.length; n++)

if (aOpen[n] == id) return true;

return false;

};

// If Push and pop is not implemented by the browser

if (!Array.prototype.push) {

Array.prototype.push = function array_push() {

for(var i=0;i<arguments.length;i++)

this[this.length]=arguments[i];

return this.length;

}

};

if (!Array.prototype.pop) {

Array.prototype.pop = function array_pop() {

lastElement = this[this.length-1];

this.length = Math.max(this.length-1,0);

return lastElement;

}

};

由于代码太长，我这里就不给大家拿来细讲了，我们只要会用就OK。就像猪肉我们能吃就OK，不一定非要知道猪养。

第二步：创建数据库，创建数据库的代码如下，我这边使用的是MySQL数据为。

create database `treedemo`;

use treedemo;

create table trees(

tid int primary key not null,

pid int not null,

tname varchar(50) not null,

isleaf int

);

select * from trees;

insert into trees(tid,pid,tname)values(0,-1,'组织内容');

insert into trees(tid,pid,tname)values(1,0,'短信');

insert into trees(tid,pid,tname)values(2,0,'彩信');

insert into trees(tid,pid,tname)values(3,0,'新闻');

insert into trees(tid,pid,tname)values(4,1,'移动生活');

insert into trees(tid,pid,tname)values(5,1,'单条滚动点播');

insert into trees(tid,pid,tname)values(6,2,'定制');

insert into trees(tid,pid,tname)values(7,2,'点播');

insert into trees(tid,pid,tname)values(8,3,'房产频道');

insert into trees(tid,pid,tname)values(9,3,'农村频道');

insert into trees(tid,pid,tname)values(10,3,'数码频道');

insert into trees(tid,pid,tname)values(11,6,'幽默笑话');

insert into trees(tid,pid,tname)values(12,7,'铃声');

insert into trees(tid,pid,tname)values(13,7,'贺卡');

insert into trees(tid,pid,tname)values(14,7,'动画');

insert into trees(tid,pid,tname)values(15,13,'贺卡1');

insert into trees(tid,pid,tname)values(16,13,'贺卡2');

insert into trees(tid,pid,tname)values(17,13,'贺卡3');

insert into trees(tid,pid,tname)values(18,13,'贺卡4');

select * from trees;

表字段的说明：

（1）tid表示节点的编号；

（2）pid 该节点父节点的编号；

（3）tname 节点名称；

（4）isleaf 表明该节点是否为叶节点，叶节点为1，非叶节点为0。该字段可根据实际情况增删。

第三步：在myeclipse中创建一个WEB工程，命名为“TreeDemo”。在WebRoot文件夹下创建js文件夹、css文件夹、images文件夹分别用来存放.js文件、.css文件和项目中用到的图片文件。

第四步：编写数据库连接类，其中的用户名、密码需要根据你数据库情况进行修改，代码如下。

复制代码代码如下:

package com.sx.mas.utils;

import java.sql.Connection;

import java.sql.DriverManager;

import java.sql.SQLException;

public class DBConn {

private static final String DRIVER="com.mysql.jdbc.Driver";

private static final String URL="jdbc:mysql://localhost:3306/treedemo";

Connection conn=null;

public Connection getConnection(){

try {

Class.forName(DRIVER);

conn=DriverManager.getConnection(URL,"root","root");

} catch (ClassNotFoundException e) {

// TODO Auto-generated catch block

e.printStackTrace();

} catch (SQLException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

return conn;

}

package com.sx.mas.utils;

import java.sql.Connection;

import java.sql.DriverManager;

import java.sql.SQLException;

public class DBConn {

private static final String DRIVER="com.mysql.jdbc.Driver";

private static final String URL="jdbc:mysql://localhost:3306/treedemo";

Connection conn=null;

public Connection getConnection(){

try {

Class.forName(DRIVER);

conn=DriverManager.getConnection(URL,"root","root");

} catch (ClassNotFoundException e) {

// TODO Auto-generated catch block

e.printStackTrace();

} catch (SQLException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

return conn;

}

第五步：编写javabean类，代码如下，

复制代码代码如下:

package com.sx.mas.beans;

public class TreeNode {

private int tid;

private int pid;

private String tname;

private int isleaf;

public int getTid() {

return tid;

}

public void setTid(int tid) {

this.tid = tid;

}

public int getPid() {

return pid;

}

public void setPid(int pid) {

this.pid = pid;

}

public String getTname() {

return tname;

}

public void setTname(String tname) {

this.tname = tname;

}

public int getIsleaf() {

return isleaf;

}

public void setIsleaf(int isleaf) {

this.isleaf = isleaf;

}

package com.sx.mas.beans;

public class TreeNode {

private int tid;

private int pid;

private String tname;

private int isleaf;

public int getTid() {

return tid;

}

public void setTid(int tid) {

this.tid = tid;

}

public int getPid() {

return pid;

}

public void setPid(int pid) {

this.pid = pid;

}

public String getTname() {

return tname;

}

public void setTname(String tname) {

this.tname = tname;

}

public int getIsleaf() {

return isleaf;

}

public void setIsleaf(int isleaf) {

this.isleaf = isleaf;

}

第六步：创建相关的DAO类，代码如下。DAO类将数据库表装保存到Vector对象中。

复制代码代码如下:

package com.sx.mas.beans;

import java.sql.Connection;

import java.sql.ResultSet;

import java.sql.SQLException;

import java.sql.Statement;

import java.util.Vector;

import com.sx.mas.utils.DBConn;

public class TreeDAO {

public Vector getTree(){

Vector vec = new Vector();

DBConn dbconn = new DBConn();

Connection conn = dbconn.getConnection();

try {

Statement stmt = conn.createStatement();

ResultSet rs = stmt.executeQuery("select * from trees");

while(rs.next()){

TreeNode treenode = new TreeNode();

treenode.setTid(rs.getInt("tid"));

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

treenode.setTname(rs.getString("tname"));

treenode.setIsleaf(rs.getInt("isleaf"));

vec.add(treenode);

}

} catch (SQLException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

return vec;

}

package com.sx.mas.beans;

import java.sql.Connection;

import java.sql.ResultSet;

import java.sql.SQLException;

import java.sql.Statement;

import java.util.Vector;

import com.sx.mas.utils.DBConn;

public class TreeDAO {

public Vector getTree(){

Vector vec = new Vector();

DBConn dbconn = new DBConn();

Connection conn = dbconn.getConnection();

try {

Statement stmt = conn.createStatement();

ResultSet rs = stmt.executeQuery("select * from trees");

while(rs.next()){

TreeNode treenode = new TreeNode();

treenode.setTid(rs.getInt("tid"));

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

treenode.setTname(rs.getString("tname"));

treenode.setIsleaf(rs.getInt("isleaf"));

vec.add(treenode);

}

} catch (SQLException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

return vec;

}

第七步：页面上显示树状结构。在TreeDemo中创建show_tree.jsp页面，代码如下。

复制代码代码如下:

<%@ page language="java" import="java.util.*" contentType="text/html; charset=gb2312"%>

<%@ page import="com.sx.mas.beans.*" %>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>

<head>

<title>My JSP 'index.jsp' starting page</title>

</head>

<table>

<tr>

<TABLE class=table_left_menu cellSpacing=0 cellPadding=0 width="100%"

background=images/tree_bg.gif border=0>

<TBODY>

<TR>

<TD>

<DIV align=center><IMG height=24 src="images/tree_button.gif" src="images/tree_button.gif"

width=147 useMap=#Map border=0>

</MAP>

</DIV>

</TD>

</TR>

</TBODY>

</TABLE>

d = new tree('d','../');

TreeDAO treedao = new TreeDAO();

Vector vec =treedao.getTree();

Iterator iterator = vec.iterator();

while(iterator.hasNext()){

TreeNode treenode = (TreeNode)iterator.next();

if(treenode.getIsleaf()==0){

d.add(<%=treenode.getTid()%>,<%=treenode.getPid()%>,'<%=treenode.getTname()%>')

<%}else{%>

d.add(<%=treenode.getTid()%>,<%=treenode.getPid()%>,'<%=treenode.getTname()%>',parent.getUrlByCatalogId('<%=treenode.getTid()%>'),null,'list');

<%}}%>

document.write(d);

</SCRIPT>

</td>

</tr>

</table>

</body>

</html>

<%@ page language="java" import="java.util.*" contentType="text/html; charset=gb2312"%>

<%@ page import="com.sx.mas.beans.*" %>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>

<head>

<title>My JSP 'index.jsp' starting page</title>

</head>

<table>

<tr>

<TABLE class=table_left_menu cellSpacing=0 cellPadding=0 width="100%"

background=images/tree_bg.gif border=0>

<TBODY>

<TR>

<TD>

<DIV align=center><IMG height=24 src="images/tree_button.gif" src="images/tree_button.gif"

width=147 useMap=#Map border=0>

</MAP>

</DIV>

</TD>

</TR>

</TBODY>

</TABLE>

d = new tree('d','../');

TreeDAO treedao = new TreeDAO();

Vector vec =treedao.getTree();

Iterator iterator = vec.iterator();

while(iterator.hasNext()){

TreeNode treenode = (TreeNode)iterator.next();

if(treenode.getIsleaf()==0){

d.add(<%=treenode.getTid()%>,<%=treenode.getPid()%>,'<%=treenode.getTname()%>')

<%}else{%>

d.add(<%=treenode.getTid()%>,<%=treenode.getPid()%>,'<%=treenode.getTname()%>',parent.getUrlByCatalogId('<%=treenode.getTid()%>'),null,'list');

<%}}%>

document.write(d);

</SCRIPT>

</td>

</tr>

</table>

</body>

</html>

第八步：创建一个框架页面，index.html代码如下，和list_default.htm。

复制代码代码如下:

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Frameset//EN">

<META http-equiv=Content-Type content="text/html; charset=gb2312"><LINK href=""

type=text/css rel=stylesheet>

function getUrlByCatalogId(catalogId) {

return "TreeDemo/content_add.jsp?catalogId="+catalogId;

}

</SCRIPT>

<META content="MSHTML 6.00.2900.3527" name=GENERATOR></HEAD><FRAMESET border=0

frameSpacing=0 rows=* frameBorder=0>

<body>

</body>

</NOFRAMES></FRAMESET></FRAMESET></HTML>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Frameset//EN">

<META http-equiv=Content-Type content="text/html; charset=gb2312"><LINK href=""

type=text/css rel=stylesheet>

function getUrlByCatalogId(catalogId) {

return "TreeDemo/content_add.jsp?catalogId="+catalogId;

}

</SCRIPT>

<META content="MSHTML 6.00.2900.3527" name=GENERATOR></HEAD><FRAMESET border=0

frameSpacing=0 rows=* frameBorder=0>

<body>

</body>

</NOFRAMES></FRAMESET></FRAMESET></HTML>

第九步：运行效果

备注：如有需要源码的请直接联系QQ398349538。

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