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JSP页面文件目录树源码(递归算法)

类别: JSP教程

<%@ 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">

</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=\'images/midnodeline.gif\'border=0 align=\'absmiddle\'><IMG src=\'images/close.gif \'border=0 align=\'absmiddle\'>","<IMG src=\'images/midclosedfolder.gif \'border=0 align=\'absmiddle\'><IMG src=\'images/close.gif \'border=0 align=\'absmiddle\'>","<IMG src=\'images/lastnodeline.gif\'border=0 align=\'absmiddle\'><IMG src=\'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=\'images/lastnodeline.gif\'border=0 align=\'absmiddle\'><IMG src=\'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 style=\'display:none\' ><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=\'images/midclosedfolder.gif \'border=0 align=\'absmiddle\'><IMG src=\'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=\'images/midopenedfolder.gif \'border=0 align=\'absmiddle\'><IMG src=\'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=\'images/midclosedfolder.gif \'border=0 align=\'absmiddle\'><IMG src=\'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=\'images/midclosedfolder.gif \'border=0 align=\'absmiddle\'><IMG src=\'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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