Listfileservlet.java
Package cn.itcast.web.servlet;
Import Java.io.File;
Import java.io.IOException;
Import Java.util.HashMap;
Import Java.util.Map;
Import javax.servlet.ServletException;
Import Javax.servlet.http.HttpServlet;
Import Javax.servlet.http.HttpServletRequest;
Import Javax.servlet.http.HttpServletResponse;
List all download files for the site
public class Listfileservlet extends HttpServlet {
public void doget (HttpServletRequest request, httpservletresponse response)
Throws Servletexception, IOException {
String filepath = This.getservletcontext (). Getrealpath ("/web-inf/upload");
Map map = new HashMap ();
ListFile (New File (filepath), map);
Request.setattribute ("map", map);
Request.getrequestdispatcher ("/listfile.jsp"). Forward (request, response);
}
public void ListFile (File file,map Map) {
if (!file.isfile ()) {
File files[] = File.listfiles ();
for (File f:files) {
ListFile (F,MAP);
}
}else{
String realname = File.getname (). substring (File.getname (). IndexOf ("_") +1); 9349249849-88343-8344_ _. avi
Map.put (File.getname (), realname);
}
}//recursive method, using list to get recursive results
public void DoPost (HttpServletRequest request, httpservletresponse response)
Throws Servletexception, IOException {
Doget (request, response);
}
}
listfile.jsp
<%@ page language= "java" import= "java.util.*" pageencoding= "UTF-8"%>
<% @taglib prefix= "C" uri= "Http://java.sun.com/jsp/jstl/core"%>
<! DOCTYPE HTML PUBLIC "-//w3c//dtd HTML 4.01 transitional//en" >
<title>my JSP ' listfile.jsp ' starting page</title>
<body>
<c:foreach var= "Me" items= "${map}" >
<c:url value= "/servlet/downloadservlet" var= "Downurl" >
<c:param name= "filename" value= "${me.key}" ></c:param>
</c:url>
${me.value} <a href= "${downurl}" > Downloads </a> <br/>
</c:forEach>
</body>
Downloadservlet.java
Package cn.itcast.web.servlet;
Import Java.io.File;
Import Java.io.FileInputStream;
Import java.io.IOException;
Import Java.io.OutputStream;
Import Java.net.URLEncoder;
Import javax.servlet.ServletException;
Import Javax.servlet.http.HttpServlet;
Import Javax.servlet.http.HttpServletRequest;
Import Javax.servlet.http.HttpServletResponse;
Import Org.apache.commons.fileupload.FileItem;
public class Downloadservlet extends HttpServlet {
public void doget (HttpServletRequest request, httpservletresponse response)
Throws Servletexception, IOException {
String filename = request.getparameter ("filename"); 23239283-92489-Avatar. avi
filename = new String (filename.getbytes ("iso8859-1"), "UTF-8");
String path = Makepath (Filename,this.getservletcontext (). Getrealpath ("/web-inf/upload"));
File File = new file (path + "\ \" + filename);
if (!file.exists ()) {
Request.setattribute ("message", "The resource you want to download has been deleted!! ");
Request.getrequestdispatcher ("/message.jsp"). Forward (request, response);
Return
}
String realname = filename.substring (Filename.indexof ("_") +1);
Response.setheader ("Content-disposition", "attachment;filename=" + urlencoder.encode (realname, "UTF-8"));
FileInputStream in = new FileInputStream (path + "\ \" + filename);
OutputStream out = Response.getoutputstream ();
byte buffer[] = new byte[1024];
int len = 0;
while ((Len=in.read (buffer)) >0) {
Out.write (buffer, 0, Len);
}
In.close ();
Out.close ();
}
public string Makepath (string filename,string savepath) {
int hashcode = Filename.hashcode ();
int dir1 = hashcode&0xf; 0--15
int dir2 = (hashcode&0xf0) >>4; 0-15
String dir = savepath + "\ \" + dir1 + "\ \" + Dir2; Upload\2\3 upload\3\5
File File = new file (dir);
if (!file.exists ()) {
File.mkdirs ();
}
return dir;
}
public void DoPost (HttpServletRequest request, httpservletresponse response)
Throws Servletexception, IOException {
Doget (request, response);
}
}
javaweb--Download File list
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