Liferay 多文件上传与下载实例

package com.file.management.portlet; import java.io.BufferedInputStream; import java.io.BufferedOutputStream; import java.io.File; import java.io.FileInputStream; import java.io.IOException; import java.text.SimpleDateFormat; import java.util.Date; import java.util.Random; import javax.portlet.ActionRequest; import javax.portlet.ActionResponse; import javax.portlet.PortletException; import javax.portlet.RenderRequest; import javax.portlet.RenderResponse; import javax.portlet.ResourceRequest; import javax.portlet.ResourceResponse; import javax.servlet.ServletOutputStream; import javax.servlet.http.HttpServletResponse; import com.liferay.portal.kernel.exception.PortalException; import com.liferay.portal.kernel.exception.SystemException; import com.liferay.portal.kernel.upload.UploadPortletRequest; import com.liferay.portal.kernel.util.FileUtil; import com.liferay.portal.kernel.util.ParamUtil; import com.liferay.portal.kernel.util.PropsUtil; import com.liferay.portal.util.PortalUtil; import com.liferay.util.bridges.mvc.MVCPortlet; public class FileManagementPortlet extends MVCPortlet { @Override public void doView(RenderRequest renderRequest, RenderResponse renderResponse) throws IOException, PortletException { // TODO Auto-generated method stub super.doView(renderRequest, renderResponse); } @Override public void processAction(ActionRequest actionRequest, ActionResponse actionResponse) throws IOException, PortletException { try { UploadPortletRequest uploadPortletRequest = PortalUtil .getUploadPortletRequest(actionRequest); saveTheUploadAttachment(uploadPortletRequest, actionResponse); } catch (PortalException e) { e.printStackTrace(); } catch (SystemException e) { e.printStackTrace(); } super.processAction(actionRequest, actionResponse); } // save or update the attachments public void saveTheUploadAttachment( UploadPortletRequest uploadPortletRequest, ActionResponse actionResponse) throws PortalException, SystemException, IOException { // E:/liferay-portal-6.2.10.1-ee-ga1/data/document_library String fileNames[] = uploadPortletRequest.getFileNames("fileName"); if (fileNames != null) { File file[] = uploadPortletRequest.getFiles("fileName"); Date date = new Date(); for (int i = 0; i < fileNames.length; i++) { String fileName = fileNames[i]; if (fileName != null && !"".equals(fileName)) { String randomSourceFileName = this.getRandomSourceFileName(fileName); File destination = null; String filePath = PropsUtil .get("dl.store.file.system.root.dir"); filePath = filePath + new SimpleDateFormat("/yyyy/MM/dd/").format(date); filePath = filePath.concat(randomSourceFileName); destination = new File(filePath); FileUtil.copyFile(file[i], destination); FileUtil.delete(file[i]); //只需把filePath保存到数据库即可，其实上传附件就是把相关要上传的文件复制到服务器的相关目录，然后下载时再去访问它的路径 System.out.println("filePath=" + filePath); } } } } //Get the randomSourceFileName public String getRandomSourceFileName(String sourceFileName) { return this.getRandomString(8)+"_"+sourceFileName; } //Generate the random string private String getRandomString(int length) { String base = "abcdefghijklmnopqrstuvwxyz0123456789"; Random random = new Random(); StringBuffer sb = new StringBuffer(); for (int i = 0; i < length; i++) { int number = random.nextInt(base.length()); sb.append(base.charAt(number)); } return sb.toString(); } @Override public void serveResource(ResourceRequest resourceRequest, ResourceResponse resourceResponse) throws IOException, PortletException { //此处获取前台传递过来的文件路径和文件名，读取它，返回给客户端 String filePath = ParamUtil.getString(resourceRequest, "filePath"); String fileName = ParamUtil.getString(resourceRequest, "fileName"); File file = new File(filePath); HttpServletResponse response = PortalUtil .getHttpServletResponse(resourceResponse); response.setContentType(getContentType(fileName)); response.setContentLength((int) file.length()); response.setHeader("Content-Disposition", "attachment;filename=" + fileName); FileInputStream fis = new FileInputStream(file); BufferedInputStream bis = new BufferedInputStream(fis); byte[] b = new byte[1024]; long k = 0; ServletOutputStream sos = response.getOutputStream(); BufferedOutputStream bos = new BufferedOutputStream(sos); while (k < file.length()) { int j = bis.read(b, 0, b.length); k += j; bos.write(b, 0, j); } bis.close(); bos.flush(); bos.close(); sos.close(); super.serveResource(resourceRequest, resourceResponse); } public String getContentType(String fileName) { String postfix = ""; postfix = fileName.substring(fileName.lastIndexOf("."), fileName.length()); postfix = postfix.toUpperCase(); String contentType = "application/xmsdownload"; if (postfix.equals(".XLS") || postfix.equals(".XLSX") || postfix.equals(".XLT") || postfix.equals(".XLW") || postfix.equals(".CSV")) { contentType = "application/vnd.ms-excel"; } else if (postfix.equals(".DOC")) { contentType = "application/msword"; } else if (postfix.equals(".RTF")) { contentType = "application/rtf"; } else if (postfix.equals(".TEXT")) { contentType = "text/plain"; } else if (postfix.equals(".XML") || postfix.equals(".TXT")) { contentType = ""; } else if (postfix.equals(".BMP")) { contentType = "image/bmp"; } else if (postfix.equals(".JPG") || postfix.equals(".JPEG")) { contentType = "image/jpeg"; } else if (postfix.equals(".GIF")) { contentType = "image/gif"; } else if (postfix.equals(".AVI")) { contentType = "video/x-msvideo"; } else if (postfix.equals(".MP3")) { contentType = "audio/mpeg"; } else if (postfix.equals(".MPA") || postfix.equals(".MPE") || postfix.equals(".MPEG") || postfix.equals(".MPG")) { contentType = "video/mpeg"; } else if (postfix.equals(".PPT") || postfix.equals(".PPS")) { contentType = "application/vnd.ms-powerpoint"; } else if (postfix.equals(".PDF")) { contentType = "application/pdf"; } else if (postfix.equals(".ZIP") || postfix.equals(".RAR")) { contentType = "application/zip"; } return contentType; } }