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.s3; import static org.springframework.hateoas.mvc.ControllerLinkBuilder.*; import java.io.IOException; import java.net.URI; import java.net.URISyntaxException; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.context.annotation.Configuration; import org.springframework.core.io.InputStreamResource; import org.springframework.core.io.Resource; import org.springframework.hateoas.Link; import org.springframework.hateoas.ResourceSupport; import org.springframework.http.MediaType; import org.springframework.http.ResponseEntity; import org.springframework.web.bind.annotation.PathVariable; 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.bind.annotation.RestController; import org.springframework.web.multipart.MultipartFile; import org.springframework.web.servlet.config.annotation.PathMatchConfigurer; import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter; /** * @author Greg Turnquist */ @RestController public class ApplicationController { private static final Logger log = LoggerFactory.getLogger(ApplicationController.class); private final FileService fileService; @Autowired public ApplicationController(FileService fileService) { this.fileService = fileService; } @RequestMapping(method = RequestMethod.POST, value = "/files") public ResponseEntity<?> newFile(@RequestParam("name") String filename, @RequestParam("file") MultipartFile file) { try { this.fileService.saveFile(file.getInputStream(), file.getSize(), filename); Link link = linkTo(methodOn(ApplicationController.class).getFile(filename)).withRel(filename); return ResponseEntity.created(new URI(link.getHref())).build(); } catch (IOException | URISyntaxException e) { return ResponseEntity.badRequest().body("Couldn't process the request"); } } @RequestMapping(method = RequestMethod.GET, value = "/files") public ResponseEntity<?> listFiles() { try { Resource[] files = this.fileService.findAll(); ResourceSupport resources = new ResourceSupport(); for (Resource file : files) { resources.add(linkTo(methodOn(ApplicationController.class).getFile(file.getFilename())) .withRel(file.getFilename())); } return ResponseEntity.ok(resources); } catch (IOException e) { return ResponseEntity.badRequest().body(e.getMessage()); } } @RequestMapping(method = RequestMethod.GET, value = "/files/{filename}") public ResponseEntity<?> getFile(@PathVariable String filename) throws IOException { Resource file = this.fileService.findOne(filename); try { return ResponseEntity.ok().contentLength(file.contentLength()).contentType(MediaType.IMAGE_JPEG) .body(new InputStreamResource(file.getInputStream())); } catch (IOException e) { return ResponseEntity.badRequest().body("Couldn't process the request"); } } @RequestMapping(method = RequestMethod.DELETE, value = "/files/{filename}") public ResponseEntity<?> deleteFile(@PathVariable String filename) { this.fileService.deleteOne(filename); return ResponseEntity.noContent().build(); } @Configuration static class AllResources extends WebMvcConfigurerAdapter { @Override public void configurePathMatch(PathMatchConfigurer matcher) { matcher.setUseSuffixPatternMatch(false); } } }