📄 servletsendfile.java
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/*This file is part of JHttpServer.This package is free software; you can redistribute it and/or modifyit under the terms of the GNU General Public License as published bythe Free Software Foundation; either version 2 of the License, or(at your option) any later version.JHttpServer is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty ofMERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See theGNU General Public License for more details.You should have received a copy of the GNU General Public Licensealong with JHttpServer; if not, write to the Free SoftwareFoundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA*/// Title : ServletSendFile.java// Version : 0.92// Copyright : Copyright (c) 2001// Author : Florent CUETO (fcueto@wanadoo.fr)// Description : Serves static files requests (supports file caching & gzipping the response)package jhttpserver;import javax.servlet.*;import javax.servlet.http.*;import java.io.*;import java.util.*;import java.net.*;import java.text.SimpleDateFormat;import java.util.zip.*;public class ServletSendFile extends HttpServlet{ private JHttpServer server; public static SimpleDateFormat sdf = new SimpleDateFormat("dd-MMM-yyyy HH:mm", Locale.ENGLISH); //private Hashtable cachedFiles; /**Initialize global variables*/ public void init() throws ServletException { server = (JHttpServer)getServletContext().getAttribute("HTTP_SERVER"); //cachedFiles = new Hashtable(); } /*public CachedFile getFile(String fileName) { File f = new File(fileName); Object obj = cachedFiles.get(fileName); if (obj != null) { CachedFile ret = (CachedFile)obj; if (ret.getModificationDate() != f.lastModified()) { try { ret.flushFileCache(); //System.out.println("Reloaded modified file " + fileName); } catch(IOException e) { return(null); } } return(ret); } CachedFile cachedFile = new CachedFile(); try { cachedFile.preloadFile(fileName); } catch(IOException e) { return(null); } cachedFiles.put(fileName, cachedFile); //System.out.println("File " + fileName + " added to File Cache"); return(cachedFile); }*/ /**Process the service request*/ public void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { String uri = URLDecoder.decode(request.getRequestURI()); String fileName = server.getServerRoot() + uri; File f = new File(fileName); if (!f.exists()) { response.sendError(HttpServletResponse.SC_NOT_FOUND); return; } if (!f.canRead()) { response.sendError(HttpServletResponse.SC_FORBIDDEN); return; } if (f.isDirectory()) { if (uri.charAt(uri.length() - 1) != '/') { response.sendRedirect("http://" + server.getServerName() + (server.getServerPort() == 80 ? "" : ":" + server.getServerPort()) + uri + "/"); return; } } File defaultFile = new File(fileName + "/" + server.getDefaultDocuments()[0]); if (f.isDirectory() && !defaultFile.exists()) { response.setContentType("text/html"); PrintWriter out = response.getWriter(); out.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 3.2 Final//EN\">"); out.println("<HTML>"); out.println("<HEAD>"); out.println("\t<TITLE>Index of " + uri + "</TITLE>"); out.println("</HEAD>"); out.println("<BODY>"); out.println("<H1>Index of " + uri + "</H1>"); out.println("<PRE><IMG SRC=\"/icons/blank.gif\" ALT=\" \"> <A HREF=\"#\">Name</A> <A HREF=\"#\">Last modified</A> <A HREF=\"#\">Size</A> <A HREF=\"#\">Description</A>"); out.println("<HR>"); String virtualPath = uri.substring(0, uri.length() - 1); int spos = virtualPath.lastIndexOf("/"); if (spos != -1) out.println("<IMG SRC=\"/icons/folder.gif\" ALT=\"[DIR]\"> <A HREF=\"" + virtualPath.substring(0, spos) + "/\">Parent Directory</A> 29-Oct-2001 11:21 - "); File[] list = f.listFiles(); for (int i = 0; i < list.length; i++) { File file = list[i]; if (file.isDirectory()) { String dirName = file.getName(); StringBuffer dirB = new StringBuffer(" "); if (dirName.length() > 23) dirName = dirName.substring(0, 20) + "..>"; else for (int j = dirName.length(); j < 23; j++) dirB.append(" "); Date dirDate = new Date(file.lastModified()); out.println("<IMG SRC=\"/icons/folder.gif\" ALT=\"[DIR]\"> <A HREF=\"" + file.getName() + "/\">" + dirName + "</A>" + dirB.toString() + sdf.format(dirDate) + " - "); } } for (int i = 0; i < list.length; i++) { File file = list[i]; if (!file.isDirectory()) { String currentFileName = file.getName(); StringBuffer fileB = new StringBuffer(" "); if (currentFileName.length() > 23) currentFileName = currentFileName.substring(0, 20) + "..>"; else for (int j = currentFileName.length(); j < 23; j++) fileB.append(" "); Date fileDate = new Date(file.lastModified()); long fileSize = 1 + Math.round(Math.floor((double)file.length() / 1024)); if (fileSize > 1024) { double longFileSize = Math.round((double)fileSize / 102.4) / (double)10; String sFileSize = "" + longFileSize + "M"; StringBuffer fileS = new StringBuffer(" "); for (int j = sFileSize.length(); j < 5; j++) fileS.append(" "); out.println("<IMG SRC=\"/icons/text.gif\" ALT=\"[TXT]\"> <A HREF=\"" + file.getName() + "\">" + currentFileName + "</A>" + fileB.toString() + sdf.format(fileDate) + " " + fileS.toString() + sFileSize + " "); } else { String sFileSize = "" + fileSize + "k"; StringBuffer fileS = new StringBuffer(" "); for (int j = sFileSize.length(); j < 5; j++) fileS.append(" "); out.println("<IMG SRC=\"/icons/text.gif\" ALT=\"[TXT]\"> <A HREF=\"" + file.getName() + "\">" + currentFileName + "</A>" + fileB.toString() + sdf.format(fileDate) + " " + fileS.toString() + sFileSize + " "); } } } out.println("</PRE><HR>"); out.println("<ADDRESS>" + getServletContext().getServerInfo() + " Server at " + server.getServerName() + " Port " + server.getServerPort() + "</ADDRESS>"); out.println("</BODY></HTML>"); return; } if (f.isDirectory() && defaultFile.exists()) { fileName = fileName + "/" + server.getDefaultDocuments()[0]; f = defaultFile; } response.setContentType(getServletContext().getMimeType(fileName)); response.setContentLength((int)f.length()); response.addDateHeader("Last-Modified", f.lastModified()); FileInputStream fis = new FileInputStream(f); BufferedInputStream bis = new BufferedInputStream(fis); try { String encodings = request.getHeader("Accept-Encoding"); if ((server.isGzipEnabled()) && (encodings != null) && (encodings.indexOf("gzip") != -1) && (f.length() < 65536)) { //response.addHeader("Accept-Ranges", "bytes"); response.setHeader("Content-Encoding", "gzip"); ByteArrayOutputStream baos = new ByteArrayOutputStream(); GZIPOutputStream gzos = new GZIPOutputStream(baos); byte[] buffer = new byte[65536]; boolean cont = true; while(cont) { int read = bis.read(buffer, 0, 65536); if (read == -1) cont = false; else { gzos.write(buffer, 0, read); } } //gzos.write(getFile(fileName).getFileContent()); gzos.close(); byte[] compressedStream = baos.toByteArray(); response.setContentLength(compressedStream.length); ServletOutputStream sos = response.getOutputStream(); sos.write(compressedStream); } else { ServletOutputStream sos = response.getOutputStream(); byte[] buffer = new byte[65536]; boolean cont = true; while(cont) { int read = bis.read(buffer, 0, 65536); if (read == -1) cont = false; else { sos.write(buffer, 0, read); } } //sos.write(getFile(fileName).getFileContent()); } } catch(IOException e) { // Client closed the connection //System.out.println("IOException while sending file : " + e); } finally { bis.close(); } } /**Clean up resources*/ public void destroy() { }}⌨️ 快捷键说明
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