(i) Get the files and directories in the current directory
Knowledge points
1 Application of the file object
2 Listfiles () method
3 Isdirectory () method, Isfile () method to determine whether a directory or file
4 Conversion String Method tostring
(1)
Create a File object, dir,
Then use the Listfiles () method to return all files in the current directory
String Path=request.getrealpath ("/");
File Dir=new file (path);
File File[]=dir.listfiles ();
(2)
Loop to determine if the return is a directory and display it
Directories are:
<%
for (int i=0;i<file.length;i++)
{
if (File[i].isdirectory ())//
Out.print ("<br>" +file[i].tostring ());
}
%>
(3)
Loop to determine if the return is a directory and display it
File has
<%
for (int i=0;i<file.length;i++)
{
if (File[i].isfile ())
Out.print ("<br>" +file[i].tostring ());
}
%>
Program
<%@ page contenttype= "text/html;charset=gb2312"%>
<%@ page import= "java.io.*"%>
<title></title>
<body>
<%
String Path=request.getrealpath ("/");
File Dir=new file (path);
File File[]=dir.listfiles ()////////////////Listfiles () method
%>
Current <%=path%><br>
Directories are:
<%
for (int i=0;i<file.length;i++)
{
if (File[i].isdirectory ())
Out.print ("<br>" +file[i].tostring ());
}
%>
<p> documents are:
<%
for (int i=0;i<file.length;i++)
{
if (File[i].isfile ())
Out.print ("<br>" +file[i].tostring ());
}
%>
</body>
(ii) Get Windows drive letter
<%@ page contenttype= "text/html;charset=gb2312"%>
<%@ page import= "java.io.*"%>
<body>
<%
File[] Roots=file.listroots ();
for (int i=0;i<roots.length;i++)
{
Out.print ("<br>" +roots[i].getpath ());
}
%>
</body>
(iii) integration of two procedures
<%@ page contenttype= "text/html;charset=gb2312"%>
<%@ page import= "java.io.*,java.util.*,java.net.*"%>
<%!
Private final static int languageno=0; Language version, 0: Chinese; 1: English
String[] Strdrivers = {"Drive", "Drivers"};
String[] strcurrentfolder= {"Current directory", "Present Folder"};
%>
<body>
<%
String Path=request.getrealpath ("/");
File Dir=new file (path);
File File[]=dir.listfiles ()////////////////Listfiles () method
StringBuffer sb=new StringBuffer (Strdrivers[languageno] + ":");
File roots[]=file.listroots ();
for (int i=0;i<roots.length;i++)
{
Sb.append ("<a href=/" Javascript:doform (', ' +roots[i]+ '//', ', ', ', ' 1 ', ');/">");
Sb.append (roots[i]+ "</a> ");
}
Out.println (SB);
%>
<%
Out.print ("<table border= ' 1 ' width= ' 100% ' bgcolor= ' #FFFFFF ' cellspacing=0 cellpadding=5 ' bordercolorlight=# 000000 bordercolordark= #FFFFFF ><tr><td> "+strcurrentfolder[languageno]+":<br><b> "+ path+ "</td><td>" +sb+ "</td></tr></table>");
%>
<table border= ' 1 ' width= ' 100% ' bgcolor= ' #FFFFFF ' cellspacing=0 cellpadding=5 #000000 bordercolordark= #FFFFFF >
<tr>
<TD width= ' 40% ' ><%=strcurrentfolder[languageno]%>:<br><%=path%></td><td width= ' 60% ' ><%=strdrivers[languageno]%>:<%=sb%></td></tr>
</table>
<table border= ' 1 ' width= ' 100% ' bgcolor= ' #FFFFFF ' cellspacing=0 cellpadding=5 #000000 bordercolordark= #FFFFFF >
<tr>
<TD width= ' 40% ' > directory are:
<%
for (int i=0;i<file.length;i++)
{
if (File[i].isdirectory ())
Out.print ("<br>" +file[i].tostring ());
}
%>
</td>
<TD width= ' 60% ' > Files are:
<%
for (int i=0;i<file.length;i++)
{
if (File[i].isfile ())
Out.print ("<br>" +file[i].tostring ());
}
%>
</td>
</tr>
</table>
</body>
As shown in figure
We are further optimized to achieve
<%@ page contenttype= "text/html; CHARSET=GBK "%>
<% @page import= "java.io.*,java.util.*,java.net.*"%>
<style type= "Text/css" >
td,select,input,body{font-size:9pt;}
A {Text-decoration:none}
#tablist {
padding:5px 0;
margin-left:0;
margin-bottom:0;
Margin-top:0.1em;
font:9pt;
}
#tablist li{
List-style:none;
Display:inline;
margin:0;
}
#tablist Li a{
PADDING:3PX 0.5em;
margin-left:3px;
BORDER:1PX solid;
Background: #FFFFFF;
}
#tablist Li A:link, #tablist Li a:visited{
Color:navy;
}
#tablist Li a.current{
Background: #FFFFFF;
}
#tabcontentcontainer {
width:100%;
padding:5px;
BORDER:1PX solid black;
}
. tabcontent{
Display:none;
}
</style>
<%!
private final static int languageno=1;//language version, 0: Chinese; 1: English
string[] strcurrentfolder= {"Current directory", "Present Folder"};
String[] strdrivers = {"Drive", "Drivers"};
String[] strfilename = {"FileName", "File name"};
String[] strfilesize = {"File size"};
String[] strlastmodified = {"Final modification", "Last Modified"};
String[] strfileoperation= {"File action", "Operations"};
String[] strfileedit = {"Modify", "edit"};
String[] strfiledown = {"Download", "Download"};
String[] strfilecopy = {"Copy", "Move"};
String[] strfiledel = {"Delete", "delete"};
String Getdrivers ()
{
StringBuffer sb=new StringBuffer (":");
File roots[]=file.listroots ();
for (int i=0;i<roots.length;i++)
{
Sb.append ("<a href=" "path=" +roots[i]+ "' >");
Sb.append (roots[i]+ "</a> ");
}
return sb.tostring ();
}
String Formatpath (String p)
{
StringBuffer sb=new StringBuffer ();
for (int i = 0; i < p.length (); i++)
{
if (P.charat (i) = = '//')
{
Sb.append ("////");
}
Else
{
Sb.append (P.charat (i));
}
}
return sb.tostring ();
}
public static string Tochinese (String str)
{
try{
if (str==null)
{
Return "";
}else
{
Str=new String (str.getbytes ("Iso8859_1"), "GBK");
return str;
}
}catch (Exception e)
{
Return "";
}
}
%>
<%
Request.setcharacterencoding ("gb2312");
String Strdir =tochinese (request.getparameter ("path"));
if (strdir==null| | Strdir.length () <1)
{
Strdir = Request.getrealpath ("/");
}
StringBuffer sb=new StringBuffer ("");
StringBuffer sbfile=new StringBuffer ("");
Try
{
File objfile = new file (Strdir);
File list[] = Objfile.listfiles ();
if (Objfile.getabsolutepath (). Length () >3)
{
Sb.append ("<tr><td > </td><td><a href= ' path=" +formatPath ( Objfile.getparentfile
(). GetAbsolutePath ()) + "' >");
Sb.append ("To parentfile</a><br>---</td></tr>/r/n");
}
for (int i=0;i<list.length;i++)
{
if (List[i].isdirectory ())
{
Sb.append ("<tr><td> </td><td>");
Sb.append ("<a href= ' path=" +formatpath (List[i].getabsolutepath ()) + "' >" +list[i].getname () + "</a>");
Sb.append ("</td></tr>");
}
Else
{
String strlen= "";
String strdt= "";
Long lfile=0;
Lfile=list[i].length ();
if (lfile>1000000)
{
lfile=lfile/1000000;
strlen= "" + lfile + "M";
}
else if (lfile>1000)
{
lfile=lfile/1000;
strlen= "" + lfile + "K";
}
Else
{
strlen= "" + lfile + "Byte";
}
Date Dt=new Date (list[i].lastmodified ());
Strdt=dt.tolocalestring ();
Sbfile.append ("<tr><td>");
Sbfile.append ("" +list[i].getname ());
Sbfile.append ("</td><td>");
Sbfile.append ("" +strlen);
Sbfile.append ("</td><td>");
Sbfile.append ("" +strdt);
Sbfile.append ("</td><td>");
Sbfile.append ("<a href=>");
Sbfile.append (strfileedit[languageno]+ "</a>");
Sbfile.append ("<a href=>");
Sbfile.append (strfiledown[languageno]+ "</a>");
Sbfile.append ("<a href=>");
Sbfile.append (strfilecopy[languageno]+ "</a>");
Sbfile.append ("<a href=>");
Sbfile.append (strfiledel[languageno]+ "</a>");
Sbfile.append ("</td></tr>/r/n");
}
}
}
catch (Exception e)
{
Out.println ("<font color=red>error:" +e.tostring () + "</font>");
}
%>
<table border= ' 1 ' width= ' 100% ' bgcolor= ' #FFFFFF ' cellspacing=0 cellpadding=5 #000000 bordercolordark= #FFFFFF >
<tr>
<TD width= ' 20% ' ><%=strcurrentfolder[languageno]%>:<br><%=strdir%></td><td width = ' 70% ' ><%=strdrivers[languageno]%><%=getdrivers ()%>
</td>
</tr>
</table>
<table border= ' 1 ' width= ' 100% ' bgcolor= ' #FFFFFF ' cellspacing=0 cellpadding=5 #000000 bordercolordark= #FFFFFF >
<tr>
<TD width= ' 20% ' valign= ' top ' >
<table >
<tr><td><%=sb%></td>
</tr>
</table>
</td>
<TD width= ' 70% ' align= ' center ' valign= ' top ' >
<table width= "100%" border= "1" cellspacing= "1" cellpadding= "4" bordercolorlight= "#000000" bordercolordark= "# FFFFFF ">
<tr>
<TD width= "26%" align= "center" ><%=strfilename[languageno]%></td>
<TD width= "19%" align= "center" ><%=strfilesize[languageno]%></td>
<TD width= "29%" align= "center" ><%=strlastmodified[languageno]%></td>
<TD width= "26%" align= "center" ><%=strfileoperation[languageno]%></td></tr>
<TR><TD width= "25%" align= "center" ><%=sbfile%></td></tr>
</table>
</td>
</tr>
</table>
