java文件下载

/** * Program  : DownServlet.java * Author   : lihuan * Create   : 2010-10-19 下午02:26:12 * * Copyright 2010 by Embedded Internet Solutions Inc., * All rights reserved. * * This software is the confidential and proprietary information * of Embedded Internet Solutions Inc.("Confidential Information").   * You shall not disclose such Confidential Information and shall  * use it only in accordance with the terms of the license agreement  * you entered into with Embedded Internet Solutions Inc. * */package cn.ipanel.app.newspapers.web.servlet;import java.io.ByteArrayInputStream;import java.io.File;import java.io.IOException;import java.io.InputStream;import javax.servlet.ServletException;import javax.servlet.ServletOutputStream;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import cn.ipanel.app.newspapers.define.NewspaperException;import cn.ipanel.app.newspapers.define.Defines;import cn.ipanel.app.newspapers.util.FileUtil;import cn.ipanel.app.newspapers.util.ZipUtil;/** *  * @author lihuan * @version 1.0.0 * @2010-10-19 下午02:26:12 */public class DownServlet extends HttpServlet {private static final long serialVersionUID = -8429092442180048726L;protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {doPost(req, resp);}protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {downloadModule(request, response);}private void downloadModule(HttpServletRequest request, HttpServletResponse response) {String downType = request.getParameter("downType");if (downType.equals("template")) {long templateId = Long.parseLong(request.getParameter("id"));// 模板存放路径String templateFileFolder = Defines.ABS_PATH_OF_PROJECT + Defines.TEMPLATE_FOLDER_PATH + templateId;String zipFilePath = Defines.ABS_PATH_OF_PROJECT + Defines.DOWM_FILE_PATH;String zipFileName = "template_" + templateId;// 压缩文件文件名，例如：template_1.zipFile zipFile = ZipUtil.getCompressToZip(templateFileFolder, zipFilePath, zipFileName);// 下载压缩文件byte buf[] = FileUtil.readFileByte(zipFile);writeByteToFile(response, zipFileName + ".zip", buf);zipFile.delete();} else if (downType.equals("news")) {long columnId = Long.parseLong(request.getParameter("columnId"));long newsId = Long.parseLong(request.getParameter("newsId"));long pageClassifyId = Long.parseLong(request.getParameter("pageClassifyId"));long newspaperId = Long.parseLong(request.getParameter("newspaperId"));boolean isHdNews = Boolean.parseBoolean(request.getParameter("isHdNews"));// 找到应用文件所在的文件夹String newsFilesFolder = Defines.ABS_PATH_OF_PROJECT;if (isHdNews)newsFilesFolder = newsFilesFolder + Defines.NEWSPAPERS_FOLDER_HD;elsenewsFilesFolder = newsFilesFolder + Defines.NEWSPAPERS_FOLDER_BD;newsFilesFolder = newsFilesFolder + columnId + File.separator + newspaperId + File.separator + pageClassifyId + File.separator + newsId;String zipFilePath = Defines.ABS_PATH_OF_PROJECT + Defines.DOWM_FILE_PATH;String zipFileName = "news_" + newspaperId + "_" + newsId;// 压缩文件名"news_"+newspaperId + "_" + newsId + ".zip"如news_1_1.zipFile zipFile = ZipUtil.getCompressToZip(newsFilesFolder, zipFilePath, zipFileName);// 下载压缩文件byte buf[] = FileUtil.readFileByte(zipFile);writeByteToFile(response, zipFileName + ".zip", buf);zipFile.delete();}}private void writeByteToFile(HttpServletResponse resp, String fileName, byte[] blobs) {ServletOutputStream sos = null;try {resp.setContentType("application/octet-stream;charset=gbk");resp.setHeader("Content-Disposition", "attachment;filename=" + new String(fileName.getBytes("GBK"), "ISO-8859-1"));sos = resp.getOutputStream();InputStream in = new ByteArrayInputStream(blobs);byte[] b = new byte[1024];int length = 0;while ((length = in.read(b)) != -1) {sos.write(b, 0, length);}} catch (Exception e) {throw new NewspaperException("下载新闻出错！");} finally {if (sos != null) {try {sos.flush();sos.close();} catch (IOException e) {e.printStackTrace();}}}}}