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JSP页面文件目录树源码(递归算法)
摘要:/***构造树,初值为0*/functionisbrother(){varis=flase;}functiontree(n){varid=n...

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

<html>

<head>

<title></title>

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

<script language="JavaScript">

<!--

function MM_goToURL() { //v3.0

var i, args=MM_goToURL.arguments; document.MM_returnValue = false;

for (i=0; i<(args.length-1); i+=2) eval(args[i]+".location='"+args[i+1]+"'");

}

//-->

</script>

<link href="css/ip.css" rel="stylesheet" type="text/css">

</head>

<body topmargin = "0" leftmargin = "0" marginheight = "0" marginwidth = "0" bgcolor="#FFFFFF">

<table border="0" cellspacing="0" cellpadding="0" height="80%">

<tr><td>

</td>

</tr>

<tr valign="top">

<td height="223"> <span id="menus"></span>

<span id="view"></span>

</td>

</tr>

<tr valign="bottom">

<td> </td>

</tr>

</table>

<div align="right"></div>

</body>

<script>

/**

* 构造树,初值为0

*/

function isbrother()

{

var is=flase;

}

function tree(n) {

var id = new Array("bar","pad","<IMG src='/htmldata/2005-08-02/images/midnodeline.gif'border=0 align='absmiddle'><IMG src='/htmldata/2005-08-02/images/close.gif 'border=0 align='absmiddle'>","<IMG src='/htmldata/2005-08-02/images/midclosedfolder.gif 'border=0 align='absmiddle'><IMG src='/htmldata/2005-08-02/images/close.gif 'border=0 align='absmiddle'>","<IMG src='/htmldata/2005-08-02/images/lastnodeline.gif'border=0 align='absmiddle'><IMG src='/htmldata/2005-08-02/images/close.gif 'border=0 align='absmiddle'>");

if(n == 0) { // 初始化变量

n = 1;

i = 0;

s = "";

}

s += "<table border=0 cellspacing=0 cellpadding=0 >";

for(;i<tree_ar.length-1;i++) {

var k = (n >= tree_ar[i+1][0])?0:1;

if(tree_ar[i][2]==false)

{

id[2]="<IMG src='/htmldata/2005-08-02/images/lastnodeline.gif'border=0 align='absmiddle'><IMG src='/htmldata/2005-08-02/images/close.gif 'border=0 align='absmiddle'>";

}

s += "<tr id='"+id[k]+"' value="+i+"><td >"+id[k+2]+"</td><td>"+tree_ar[i][1]+"</td></tr>"; // // 构造节点,注意这里的自定义属性value。作用是简化构造节点的描述,共享参数数组信息。

if(n > tree_ar[i+1][0]) { // 若期望层次大于当前层次,结束本层次返回上一层次。

s += "</td></tr></table>";

return tree_ar[i+1][0];

}

if(n < tree_ar[i+1][0]) { // 若期望层次小于当前层次,递归进入下一层次。

s += "<tr ><td ";

if(tree_ar[i][2]==true)

{ //如果有下个兄弟节点,则画兄弟节点间的连线

s+="background='images/line.gif' border=0 align='absmiddle'";

}

s+="></td><td>";

var m = tree(tree_ar[++i][0]);

s += "</td></tr>";

if(m < n) { // 当递归返回值小于当前层次期望值时,将产生连续的返回动作

s += "</table>";

return m;

}

}

}

s += "</table>";

return s;

}

</script>

<script for=pad event=onclick>

// 分枝节点的点击响应

v = this.parentElement.rows[this.rowIndex+1].style;

if(v.display == 'block') {

v.display = 'none';

this.cells[0].innerHTML = "<IMG src='/htmldata/2005-08-02/images/midclosedfolder.gif 'border=0 align='absmiddle'><IMG src='/htmldata/2005-08-02/images/close.gif 'border=0 align='absmiddle'>";

view.innerHTML = "";// 自行修改为参数数组定义的闭合动作

}else {

v.display = 'block';

this.cells[0].innerHTML = "<IMG src='/htmldata/2005-08-02/images/midopenedfolder.gif 'border=0 align='absmiddle'><IMG src='/htmldata/2005-08-02/images/open.gif 'border=0 align='absmiddle'>";

// view.innerHTML = "<b>"+tree_ar[this.value][1]+"</b>"; // 自行修改为参数数组定义的展开动作

}

/**

* 以下代码用于关闭已展开的其他分枝

* 如需自行关闭展开的分枝则从这里直接返回或删去这段代码

*/

if(! tree_ar[this.value].type) //如该节点为首次进入,则记录所在层次信息

genTreeInfo(this);

var n = 1*this.value+1;

for(i=n;i<tree_ar.length-1;i++) { // 关闭排列在当前节点之后的树

if(tree_ar[i].type == "pad") {

tree_ar[i].obj2.style.display = 'none';

tree_ar[i].obj1.cells[0].innerHTML = "<IMG src='/htmldata/2005-08-02/images/midclosedfolder.gif 'border=0 align='absmiddle'><IMG src='/htmldata/2005-08-02/images/close.gif 'border=0 align='absmiddle'>";

}

}

while(tree_ar[--n][0] > 1); //回溯到当前树的起点

while(--n >= 0) // 关闭排列在当前树的起点之前的树

if(tree_ar[n].type == "pad") {

tree_ar[n].obj2.style.display = 'none';

tree_ar[n].obj1.cells[0].innerHTML = "<IMG src='/htmldata/2005-08-02/images/midclosedfolder.gif 'border=0 align='absmiddle'><IMG src='/htmldata/2005-08-02/images/open.gif 'border=0 align='absmiddle'>";

}

/** 记录层次信息,用以简化遍历树时的复杂的节点描述 **/

function genTreeInfo(o) {

var el = o.parentElement;

for(var i=0;i<el.rows.length;i++) {

if(el.rows[i].id != "") {

tree_ar[el.rows[i].value].type = el.rows[i].id;

}

if(el.rows[i].id == "pad") {

tree_ar[el.rows[i].value].obj1 = el.rows[i];

tree_ar[el.rows[i].value].obj2 = el.rows[i+1];

}

}

}

</script>

<script for=bar event=onclick>

// 无分枝节点的点击响应

//view.innerHTML = "<b>"+tree_ar[this.value][1]+"</b>"; // // 自行修改为参数数组定义的点击动作

// 自行修改为参数数组定义的点击动作

</script>

<script for=bar event=onclick>

// 无分枝节点的点击响应

//view.innerHTML = "<b>"+tree_ar[this.value][1]+"</b>"; // uFFFDuFFFDuFFFDsuFFFDCuFFFDuFFFD?uFFFDQuFFFDuFFFDuFFFDuFFFD?uFFFDuFFFD?uFFFDIuFFFD_??uFFFDuFFFD

</script>

<script>

/**

* 基本参数数组,根据具体应用自行扩展

* 数据可较简单的由服务器端提供

* 列1:节点层次

* 列2:节点标题

* 列3: 有无下个兄弟节点

* 其余自行扩充

*/

tree_ar = new Array(

<%

FileTree tree=new FileTree();

String array=tree.showFileTree("E:");

%>

<%=array%>

new Array(1,"",false) // 为简化终止判断附加的空数据项

);

/*** 创建菜单 ***/

menus.innerHTML =tree(0);

</script>

</html>

import java.io.File;

public class FileTree {

public FileTree() {

}

/**

*

* 生成文件目录树

*

* @param path

* 目录路径

* @return 返回jsp 页面所需的目录数组(JavaScript 数组)

*

*/

/*

* 有无兄弟节点

*/

private boolean hasNexetBrother = false;

/*

* 节点层次

*/

private int index=1;

public String showFileTree(String path) {

String s = "";

File dir = new File(path);

if (dir != null && dir.isDirectory()) {

String absolutePath = dir.getAbsolutePath();

absolutePath = absolutePath.replaceAll("", "");//对''的处理,在JSP参数传递时''和空格会出现错误

absolutePath = absolutePath.replaceAll(" ", "@"); //对空格的处理 ,这时用'@'替代

s += "new Array(" + index + ",'<a href=fileList.jsp?path="

+ absolutePath + " target=mainFrame>" + dir.getName()

+ "</a>'," + hasNexetBrother + "), ";

hasNexetBrother = false;

index++;

File[] dirs = dir.listFiles();

java.util.List list = new java.util.ArrayList();

for (int i = 0; i < dirs.length; i++) {

if (dirs[i].isDirectory()) {//去除文件.得到文件夹列表

list.add(dirs[i]);

}

}

for (int i = 0; i < list.size(); i++) {

if (i != list.size() - 1)

hasNexetBrother = true;

String dirpath = ((File) list.get(i)).getAbsolutePath();

s += showFileTree(dirpath);//对子文件夹递归处理

}

index--;

}

return s;

}

}

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