Java tutorial
/* * Copyright 2012 the original author or authors. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package com.springsource.html5expense.controller; import java.io.IOException; import java.io.OutputStream; import java.sql.Blob; import java.util.Map; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.hibernate.Hibernate; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Controller; import org.springframework.util.FileCopyUtils; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RequestMethod; import org.springframework.web.bind.annotation.RequestParam; import org.springframework.web.multipart.MultipartFile; import com.springsource.html5expense.model.Attachment; import com.springsource.html5expense.service.AttachmentService; import com.springsource.html5expense.service.ExpenseService; @Controller public class FileAttachmentController { @Autowired private ExpenseService expenseService; @Autowired private AttachmentService attachmentService; @RequestMapping(value = "/save", method = RequestMethod.POST) public String save(@RequestParam("file") MultipartFile file) { try { String fileName = file.getOriginalFilename(); String contentType = file.getContentType(); Attachment attachment = new Attachment(fileName, contentType, file.getBytes()); attachmentService.save(attachment); } catch (IOException e) { e.printStackTrace(); } return "redirect:/"; } @RequestMapping(value = "/download") public void download(HttpServletRequest request, HttpServletResponse response) throws Exception { String attachmentId = request.getParameter("attachmentId"); Attachment attachment = this.attachmentService.getAttachment(new Long(attachmentId)); response.setContentType(attachment.getContentType()); response.setHeader("Content-Disposition", "attachment; filename=\"" + attachment.getFileName() + "\""); response.setHeader("cache-control", "must-revalidate"); OutputStream out = response.getOutputStream(); out.write(attachment.getContent()); out.flush(); } }