Java tutorial
/* * Copyright 2015 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.greglturnquist.springagram.fileservice.mongodb; import static org.springframework.data.mongodb.core.query.Query.*; import static org.springframework.data.mongodb.gridfs.GridFsCriteria.*; import java.io.InputStream; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.data.mongodb.gridfs.GridFsResource; import org.springframework.data.mongodb.gridfs.GridFsTemplate; import org.springframework.http.MediaType; import org.springframework.stereotype.Service; /** * @author Greg Turnquist */ @Service public class FileService { private final GridFsTemplate gridFsTemplate; @Autowired public FileService(GridFsTemplate gridFsTemplate) { this.gridFsTemplate = gridFsTemplate; } public void saveFile(InputStream input, String filename) { this.gridFsTemplate.delete(query(whereFilename().is(filename))); this.gridFsTemplate.store(input, filename, MediaType.IMAGE_JPEG_VALUE); } public GridFsResource[] findAll() { return this.gridFsTemplate.getResources("*"); } public GridFsResource findOne(String filename) { return this.gridFsTemplate.getResource(filename); } public void deleteAll() { for (GridFsResource resource : this.gridFsTemplate.getResources("*")) { this.deleteOne(resource.getFilename()); } } public void deleteOne(String filename) { this.gridFsTemplate.delete(query(whereFilename().is(filename))); } }