jsp获取当前目录下的文件和目录,获取windows盘符

转：https://blog.csdn.net/huoyuming/article/details/3910670

知识点

1 file对象的应用
2 listFiles()方法
3 isDirectory()方法,isFile()方法判断是否为目录或是文件
4转换字符串方法toString
(1)
创建一个file对象dir,
然后用listFiles()方法返回当前目录下所有文件
String path=request.getRealPath("/");
File dir=new File(path);
File file[]=dir.listFiles();

(2)
循环判断所返回的是否为目录,并显示出来
目录有:
<%
for(int i=0;i<file.length;i++)
{
if(file[i].isDirectory())//
out.print("<br>"+file[i].toString());
}
%>

(3)
循环判断所返回的是否为目录,并显示出来
文件有
<%
for(int i=0;i<file.length;i++)
{
if(file[i].isFile())
out.print("<br>"+file[i].toString());
}
%>

程序

<%@ page contentType="text/html;charset=GB2312"%>
<%@ page import="java.io.*"%>
<html>
<title></title>
<body>
<%
String path=request.getRealPath("/");
File dir=new File(path);
File file[]=dir.listFiles();//用file对象的listFiles()方法返回指定目录下的文件
%>
当前<%=path%><br>

目录有:
<%
for(int i=0;i<file.length;i++)
{
   if(file[i].isDirectory())
   out.print("<br>"+file[i].toString());
}
%>
<p>文件有:
<%
for(int i=0;i<file.length;i++)
{
    if(file[i].isFile())
    out.print("<br>"+file[i].toString());
}
   %>
</body>
</html>

(二)获取windows盘符

<%@ page contentType="text/html;charset=GB2312"%>
<%@ page import="java.io.*"%>
<html>
<body>
<%
File[] roots=File.listRoots();
for(int i=0;i<roots.length;i++)
{
out.print("<br>"+roots[i].getPath());
}
%>
</body>
</html>

(三)将两个程序合并

<%@ page contentType="text/html;charset=GB2312"%>
<%@ page import="java.io.*,java.util.*,java.net.*" %>
<%!
private final static int languageNo=0; //语言版本，0 : 中文； 1：英文
String[] strDrivers      = {"驱动器","Drivers"};
String[] strCurrentFolder= {"当前目录","Current Folder"};
%>
<html>
<body>
<%
String path=request.getRealPath("/");
File dir=new File(path);
File file[]=dir.listFiles();//用file对象的listFiles()方法返回指定目录下的文件
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 bordercolorlight=#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 bordercolorlight=#000000 bordercolordark=#FFFFFF>
<tr>
<td width='40%'>目录有:
<%
for(int i=0;i<file.length;i++)
{
   if(file[i].isDirectory())
   out.print("<br>"+file[i].toString());
}
%>
</td>
<td width='60%'>文件有:
<%
for(int i=0;i<file.length;i++)
{
    if(file[i].isFile())
    out.print("<br>"+file[i].toString());
}
   %>
</td>
</tr>
</table>
</body>
</html>

如图

我们进一步的优化,实现

<%@ page contentType="text/html; charset=GBK" %>
<%@page import="java.io.*,java.util.*,java.net.*" %>
<head>
<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{
100%;
padding: 5px;
border: 1px solid black;
}

.tabcontent{
display:none;
}

</style>
</head>
<%!

private final static int languageNo=1; //语言版本，0 : 中文； 1：英文
String[] strCurrentFolder= {"当前目录","Current Folder"};
String[] strDrivers      = {"驱动器","Drivers"};
String[] strFileName     = {"文件名称","File Name"};
String[] strFileSize     = {"文件大小","File Size"};
String[] strLastModified = {"最后修改","Last Modified"};
String[] strFileOperation= {"文件操作","Operations"};
String[] strFileEdit     = {"修改","Edit"};
String[] strFileDown     = {"下载","Download"};
String[] strFileCopy     = {"复制","Move"};
String[] strFileDel      = {"删除","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 bordercolorlight=#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 bordercolorlight=#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>