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("https://www.jb51.net/"); 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:
<% 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：
<% 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("https://www.jb51.net/"); 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("https://www.jb51.net/"); 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=https://www.jb51.net/"javascript:doForm('','"+roots[i]+"//','','','1','');/"https://www.jb51.net/article/>"); sb.append(roots[i]+"</a> "); } //out.println(sb); %> <% //out.print("<table bgcolor='#FFFFFF' cellspacing=0 cellpadding=5 bordercolorlight=#000000 bordercolordark=#FFFFFF><tr><td>"+strCurrentFolder[languageNo]+":<br><b>"+path+"</td><td>"+sb+"</td></tr></table>"); %> <table bgcolor='#FFFFFF' cellspacing=0 cellpadding=5 bordercolorlight=#000000 bordercolordark=#FFFFFF> <tr> <td><%=strCurrentFolder[languageNo]%>:<br><%=path %></td><td><%=strDrivers[languageNo] %>:<%=sb%></td></tr> </table> <table bgcolor='#FFFFFF' cellspacing=0 cellpadding=5 bordercolorlight=#000000 bordercolordark=#FFFFFF> <tr> <td>目录有: <% for(int i=0;i<file.length;i++) { if(file[i].isDirectory()) out.print("<br>"+file[i].toString()); } %> </td> <td>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>
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{ width: 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("https://www.jb51.net/"); } 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=https://www.jb51.net/article/>"); sbFile.append(strFileEdit[languageNo]+"</a> "); sbFile.append(" <a href=https://www.jb51.net/article/>"); sbFile.append(strFileDown[languageNo]+"</a> "); sbFile.append(" <a href=https://www.jb51.net/article/>"); sbFile.append(strFileCopy[languageNo]+"</a> "); sbFile.append(" <a href=https://www.jb51.net/article/>"); sbFile.append(strFileDel[languageNo]+"</a> "); sbFile.append("</td></tr>/r/n"); } } } catch(Exception e) { out.println("<font color=red>error： "+e.toString()+"</font>"); } %> <table bgcolor='#FFFFFF' cellspacing=0 cellpadding=5 bordercolorlight=#000000 bordercolordark=#FFFFFF> <tr> <td><%=strCurrentFolder[languageNo]%>:<br><%=strDir %></td><td><%=strDrivers[languageNo] %><%=getDrivers()%> </td> </tr> </table> <table bgcolor='#FFFFFF' cellspacing=0 cellpadding=5 bordercolorlight=#000000 bordercolordark=#FFFFFF> <tr> <tdvalign="top"> <table > <tr><td><%=sb%></td> </tr> </table> </td> <tdalign="center" valign="top"> <tableborder="1" cellspacing="1" cellpadding="4" bordercolorlight="#000000" bordercolordark="#FFFFFF"> <tr> <td><%=strFileName[languageNo] %></td> <td><%=strFileSize[languageNo] %></td> <td><%=strLastModified[languageNo] %></td> <td><%=strFileOperation[languageNo] %></td></tr> <tr><td><%=sbFile %></td></tr> </table> </td> </tr> </table>